WO2016151390A1 - Pieces a structure bainitique a hautes proprietes de resistance et procede de fabrication - Google Patents
Pieces a structure bainitique a hautes proprietes de resistance et procede de fabrication Download PDFInfo
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- WO2016151390A1 WO2016151390A1 PCT/IB2016/000343 IB2016000343W WO2016151390A1 WO 2016151390 A1 WO2016151390 A1 WO 2016151390A1 IB 2016000343 W IB2016000343 W IB 2016000343W WO 2016151390 A1 WO2016151390 A1 WO 2016151390A1
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 239000000203 mixture Substances 0.000 claims abstract description 24
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 13
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 11
- 229910001563 bainite Inorganic materials 0.000 claims abstract description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 10
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- 239000012535 impurity Substances 0.000 claims abstract description 4
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- 238000001816 cooling Methods 0.000 claims description 25
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 239000010936 titanium Substances 0.000 claims description 11
- 239000010955 niobium Substances 0.000 claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 8
- 229910052799 carbon Inorganic materials 0.000 claims description 8
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- 239000011572 manganese Substances 0.000 claims description 8
- 229910052710 silicon Inorganic materials 0.000 claims description 8
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- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 7
- 229910052719 titanium Inorganic materials 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 229910052758 niobium Inorganic materials 0.000 claims description 6
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 239000000047 product Substances 0.000 claims description 6
- 239000011265 semifinished product Substances 0.000 claims description 5
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 4
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- 229910052750 molybdenum Inorganic materials 0.000 claims description 4
- 239000011733 molybdenum Substances 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- 238000003303 reheating Methods 0.000 claims description 4
- 229910052717 sulfur Inorganic materials 0.000 claims description 4
- 239000011593 sulfur Substances 0.000 claims description 4
- 229910052720 vanadium Inorganic materials 0.000 claims description 4
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 3
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 238000003754 machining Methods 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims description 2
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 16
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- 230000000694 effects Effects 0.000 description 10
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 7
- 229910052796 boron Inorganic materials 0.000 description 7
- 238000005496 tempering Methods 0.000 description 7
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- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000005242 forging Methods 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- 230000002829 reductive effect Effects 0.000 description 3
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- 238000007493 shaping process Methods 0.000 description 3
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 229910052797 bismuth Inorganic materials 0.000 description 2
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 229910001567 cementite Inorganic materials 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 230000002596 correlated effect Effects 0.000 description 2
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- 230000007613 environmental effect Effects 0.000 description 2
- 235000019589 hardness Nutrition 0.000 description 2
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 2
- 229910000734 martensite Inorganic materials 0.000 description 2
- 150000001247 metal acetylides Chemical class 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
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- 229910052711 selenium Inorganic materials 0.000 description 2
- 239000011669 selenium Substances 0.000 description 2
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- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 229910052714 tellurium Inorganic materials 0.000 description 2
- PORWMNRCUJJQNO-UHFFFAOYSA-N tellurium atom Chemical compound [Te] PORWMNRCUJJQNO-UHFFFAOYSA-N 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
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- 238000009415 formwork Methods 0.000 description 1
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- 229910001562 pearlite Inorganic materials 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
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- 239000004848 polyfunctional curative Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
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- 238000005482 strain hardening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000007669 thermal treatment Methods 0.000 description 1
- 230000035899 viability Effects 0.000 description 1
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- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
Definitions
- the present invention covers a parts manufacturing high strength properties while being machineable, obtained from steels simultaneously having good hot ductility for performing hot forming operations and such that n hardenability It is not useful to perform tempering and tempering operations to obtain the advertised properties.
- the invention relates more precisely to parts having, whatever the shape and complexity of the part, a mechanical strength greater than or equal to 1100 MPa, having a yield strength greater than or equal to 700 MPa, an elongation at break A greater than or equal to 12 and a necking with Z-breaking greater than 30%,
- each part, bar, any form, wire or complex piece obtained by hot forming process is defined as, for example, rolling, or forging with or without subsequent partial or total reheating operations. , thermal or thermochemical treatment and / or shaping with or without removal of material, or even with addition of material as for welding.
- hot forming of a steel is meant any process that modifies the primary form of a product by an operation which is carried out at a temperature of the material such that the crystalline structure of the steel is predominantly austenitic.
- EP0787812 describes a process for the manufacture of forged parts whose chemical composition comprises, by weight: 0.1% ⁇ C ⁇ 0.4%; 1% ⁇ Mn ⁇ 1, 8%; 1, 2% ⁇ Si ⁇ 1, 7%; 0% ⁇ Ni ⁇ 1%; 0% ⁇ Cr ⁇ 1, 2%; 0% ⁇ Mo ⁇ 0.3%; 0% ⁇ V ⁇ 0.3%; Cu ⁇ 0.35% optionally from 0.005% to 0.06% aluminum, optionally boron in contents of between 0.0005% and 0.01%, optionally between 0.005% and 0.03% titanium, optionally between 0.005 % and 0.06% of niobium, optionally from 0.005% to 0.1% of sulfur, optionally up to 0.006% of calcium, optionally up to 0.03% of tellurium, optionally up to 0.05% of selenium, optionally up to 0.05% bismuth, optionally up to 0.1% lead, the balance being iron and impurities resulting from the preparation.
- This method involves subjecting the workpiece to a heat treatment having a cooling from a temperature at which the steel is fully austenitic to a temperature Tm of between Ms + 100 D ° C and Ms-20 ° C at a temperature of cooling rate Vr greater than 0.5 ° C / s, followed by holding the workpiece between Tm and Tf, with Tf> Tm-100 ° C, and preferably Tf> Tm-60 ° C, for at least 2 minutes to obtain a structure comprising at least 15%, and preferably at least 30% of bainite formed between Tm and Tf.
- This technique requires many process steps that are detrimental to productivity.
- the object of the present invention is to solve the problems mentioned above. It aims to provide a steel for hot formed parts with high strength properties, simultaneously having a mechanical strength and a deformation capacity to perform hot forming operations.
- the invention more specifically relates to steels having a mechanical strength greater than or equal to 1100 MPa (ie a hardness greater than or equal to 300 Hv), having a yield strength greater than or equal to 700 MPa, and a higher breaking elongation or equal to 12%, with a failure greater than 30%.
- the invention also aims to provide a steel with an ability to be produced in a robust manner that is to say without large variations in properties depending on the manufacturing parameters and machinable with commercially available tools without loss of strength. productivity during implementation.
- the subject of the invention is a part according to claims 1 to 12 and a part manufacturing method according to claim 13.
- the chemical composition in percentage by weight, must be the following:
- the carbon content is between 0.10 and 0.30%. If the carbon content is below 0.10% by weight, there is a risk of forming pro-eutectoid ferrite and insufficient mechanical strength. Beyond 0.30%, the weldability becomes more and more reduced because it is possible to form low-tenacity microstructures in the heat-affected zone (ZAT) or in the melted zone. Within this range, the weldability is satisfactory, and the mechanical properties are stable and consistent with the targets of the invention. According to a preferred embodiment, the carbon content is between 0.15 and 0.27% and preferably between 0.17 and 0.25%.
- the manganese is between 1, 6 and 2.1% and preferably between 1.7% and 2.0%. It is a hardening element with solid solution of substitution, it stabilizes the austenite and lowers the transformation temperature Ac3. Manganese therefore contributes to an increase in mechanical strength. A minimum content of 1.6% by weight is necessary to obtain the desired mechanical properties. However, beyond 2.1%, its gammagenic character leads to a significant slowing down of the bainitic transformation kinetics occurring during final cooling and the bainite fraction would be insufficient to achieve a yield strength greater than or equal to 700 MPa. . This combines a satisfactory mechanical strength without increasing the risk of decreasing the bainite fraction and thus reducing the yield strength, nor increasing the quenchability in welded alloys, which would adversely affect the weldability of steel according to the invention.
- the chromium content should be between 0.5% and 1.7% and preferably between 1.0 and 1.5%.
- This element makes it possible to control the formation of ferrite on cooling from a completely austenitic structure, because this ferrite, in a large quantity, reduces the mechanical strength required for the steel according to the invention.
- This element also makes it possible to harden and refine the bainitic microstructure, which is why a minimum content of 0.5% is necessary.
- this element considerably slows down the kinetics of the bainitic transformation, so, for contents greater than 1.7%, the bainite fraction may be insufficient to reach a yield strength greater than or equal to 700 MPa.
- a range of chromium content of between 1.0% and 1.5% is chosen to refine the bainitic microstructure.
- the silicon must be between 0.5 and 1.0%. In this range, the residual austenite stabilization is made possible by the addition of silicon which considerably slows the precipitation of carbides during bainitic transformation. This has been corroborated by the inventors who have noted that the bainite of the invention is virtually free of carbides. This is because the solubility of silicon in cementite is very low and this element increases carbon activity in austenite. Any formation of cementite will therefore be preceded by a step of rejection of Si at the interface. The enrichment of the austenite carbon, therefore leads to its stabilization at room temperature on the steel according to this first embodiment.
- the application of an external stress at a temperature below 200 ° C may lead to the transformation of part of this austenite in martensite. This transformation will result in increasing the yield point.
- the minimum silicon content should be set at 0.5% by weight to achieve the stabilizing effect on the austenite and retard carbide formation.
- the yield strength does not reach the required minimum of 700 MPa.
- an addition of silicon in an amount greater than 1.0% will induce an excess of residual austenite which will reduce the yield strength.
- the silicon content will be between 0.75 and 0.9% in order to optimize the aforementioned effects.
- the niobium should be between 0.065% and 0.15%. It is a micro-alloy element that has. the particularity of forming hardeners precipitating with carbon and / or nitrogen. II. also makes it possible to delay the bainitic transformation, in synergy with the micro-alloy elements such as boron and molybdenum present in the invention.
- the niobium content must nevertheless be limited to 0.15% to avoid the formation of large precipitates which may be crack initiation sites and to avoid the problems of loss of hot ductility associated with a possible intergranular precipitation of nitrides.
- the niobium content must be greater than or equal to 0.065% which, combined with titanium, makes it possible to have a stabilizing effect on the final mechanical properties, ie a lower sensitivity to the speed of cooling. Indeed, it can form mixed carbonitrides with titanium and remain stable at relatively high temperatures, which makes it possible to avoid the abnormal magnification of the grains at high temperature, or even allowing sufficiently high refinement of the austenitic grain.
- the maximum content of Nb is in the range 0.065% and 0, 0% to optimize the aforementioned effects.
- the titanium content should be such that 0.010 ⁇ Ti ⁇ 0.1%.
- a content maximum of 0.1% is tolerated, above titanium will have the effect of increasing the price and generate harmful precipitates for fatigue resistance and machinability.
- a minimum of 0.010% is required to control the austenitic grain size and to protect the boron from nitrogen.
- a titanium content range of between 0% and 0.20% and 0.03% is chosen.
- the boron content should be between 10 ppm (0.0010%) and 50 ppm (0.0050%).
- This element makes it possible to control the formation of ferrite on cooling from a completely austenitic structure, because this ferrite, in a large quantity, would reduce the mechanical strength and the elastic limit targeted by the invention. This is a soaking element.
- a minimum content of 10 ppm is necessary to avoid the formation of ferrite during natural cooling, so generally below 2 ° C / s for the types of parts covered by the invention.
- above 50 ppm boron will have the effect of forming iron borides that may be harmful to ductility.
- a range of boron content of between 20 ppm and 30 ppm is chosen to optimize the above-mentioned effects.
- the nitrogen content should be between 10 ppm (0.0010%) and 130 ppm (0.0130%).
- a minimum content of 10 ppm is required to form the abovementioned carbonitrides.
- the nitrogen may cause the bainitic ferrite to become too hard to harden, with possible reduction in the resilience of the finished part.
- a range of nitrogen content between 50 ppm and 120 ppm is chosen to optimize the aforementioned effects.
- the aluminum content must be less than or equal to 0.050% and preferably less than or equal to 0.040%, or even less than or equal to 0.020%.
- the Al content is such that 0.003% ⁇ Al 0,0 0.015%. This is a residual element whose content we wish to limit.
- High levels of aluminum are considered to increase erosion of refractories and the risk of clogging of the nozzles during steel casting.
- aluminum segregates negatively and, it can lead to macro-segregations. In excessive amounts, aluminum can reduce hot ductility and increase the risk of defects in continuous casting. Without a strong control of the casting conditions, the defects of the micro and macro segregation type ultimately give rise to segregation on the forged part.
- This band structure consists of alternating bainitic strips with different hardnesses which can adversely affect the formability of the material.
- the molybdenum content must be less than or equal to 1.0%, preferably less than or equal to 0.5%. Preferably, a range of molybdenum content of between 0.03 and 0.15% is chosen. Its presence is favorable for the formation of bainite by synergistic effect with boron and niobium. It thus makes it possible to guarantee the absence of pro-eutectoid ferrite at the grain boundaries. Beyond a content of 1.0%, it promotes the appearance of martensite which is not sought.
- the nickel content must be less than or equal to 1.0%. A maximum content of 1.0% is tolerated, above the nickel will have the effect of increasing the price of the proposed solution, which may reduce its viability from an economic point of view.
- a range of nickel content between 0 and 0.55% is chosen.
- the vanadium content must be less than or equal to 0.3%. A maximum content of 0.3% is tolerated, above vanadium will have the effect of increasing the price of the solution and affect the resilience.
- a vanadium content range of between 0 and 0.2% is selected.
- Sulfur can be at different levels depending on the desired machinability. There will always be a small quantity because it is a residual element whose value can not be reduced to an absolute zero, but it can also be added voluntarily. A lower S content will be aimed if the desired fatigue properties are very high. In general, we will target between 0.015 and 0.04%, knowing that it is possible to add up to 0.1% to improve machinability. Alternatively, it is also possible to add in combination with sulfur one or more elements selected from tellurium, selenium, lead and bismuth in amounts of less than or equal to 0.1% for each element.
- the phosphorus must be less than or equal to 0.050% and preferably less than or equal to 0.025%. It is an element that hardens in solid solution but significantly reduces weldability and hot ductility, especially due to its ability to segregate at grain boundaries or its tendency to co-segregate with manganese. . For these reasons, its content should be limited to 0.025% in order to obtain good weldability.
- the copper content must be less than or equal to 0.5% A maximum content of 0.5% is tolerated because above the copper will have the effect of reducing the fitness of the product.
- the remainder of the composition consists of iron and unavoidable impurities resulting from processing, such as for example arsenic or tin.
- compositions according to the invention may furthermore fulfill the following conditions, taken alone or in combination:
- Vr400 represents the cooling rate in the temperature range between 420 and 380 ° C.
- Vr600 represents the cooling rate in the temperature range between 620 and 580 ° C.
- the criterion S1 is correlated with the robustness of the mechanical properties compared to the variations of cooling conditions in general and in the face of Vr600 variations in particular.
- the respect of the value ranges of this criterion thus makes it possible to guarantee a very low sensitivity of the grade to the manufacturing conditions.
- 0.200 ⁇ S1 ⁇ 0.4 0.200 ⁇ S1 ⁇ 0.4, which further improves the robustness.
- the criteria S2 to S4 are correlated with obtaining a predominantly bainitic structure with more than 70% for the grades according to the invention, thus making it possible to guarantee the attainment of the intended mechanical properties.
- the microstructure of the steel may contain, in surface proportion after the final cooling:
- bainite in a content between 70 and 100%.
- bainite means a bainite comprising less than 5% carbide surface and whose inter-slab phase is austenite.
- the steel according to the invention will have a lower mechanical strength than the 1100 MPa referred to.
- the steel according to the invention may be manufactured by the method described below:
- a steel of composition according to the invention is supplied in the form of a bloom, a billet of rectangular or round square section, or in the form of an ingot, then
- This steel is rolled as a semi-finished product, in the form of a bar or wire and
- one carries the semi-finished product to a reheating temperature (T rec h) of between 00 ° C and 1300 ° C to obtain a semi-finished product heated, then the heated half-product is shaped while hot, the hot-forming end temperature being greater than or equal to 850 ° C. in order to obtain a hot-formed part;
- T rec h reheating temperature
- said hot formed part is cooled to a temperature of between 620 and 580 ° C. at a cooling rate Vr600 of between 0.10 ° C./s and 10 ° C./s.
- said part is cooled down to a temperature between 420 and 380 ° C. at a cooling rate Vr 400 of less than 4 ° C./s, and then the part is cooled between 380 ° C. and 300 ° C. at a lower speed. or equal to 0.3 ° C / s, then
- the part is cooled to ambient temperature at a speed of less than or equal to 4 ° C./s, then
- the heat-formed part which is cooled down to ambient temperature is optionally subjected to heat treatment at a temperature of between 300 ° C. and 450 ° C. for a period of between 30 minutes and 120 minutes; then
- the heat treatment of income is carried out to ensure the obtaining of very good properties of the parts after cooling.
- the chemical compositions of the steels used in the tests were collated in Table 1.
- the reheating temperature of these grades was 1250 ° C.
- the end temperature of hot shaping was 1220 ° C.
- Cooling rates Vr600 and Vr400 are shown in Table 2.
- FIG. 1 shows the variation of the mechanical resistance to rupture Rm as a function of the cooling rate Vr600 for the grades A and B.
- FIG. 2 shows the variation of the elastic limit Re as a function of the cooling speed Vr600 for the shades A and B.
- the grade according to the invention has a high stability of its mechanical properties when the cooling conditions vary.
- the grade is therefore much more robust to variations in process conditions than grades according to the prior art.
- FIG. 3 shows the delta of the mechanical strength at break Rm as a function of the criterion S1 for the grades A, B and C.
- FIG. 4 shows the delta of the elastic limit Re as a function of the criterion S1. for grades A, B and C.
- the invention will notably be used with advantage for the manufacture of hot formed parts and in particular, hot forged, for applications in land motor vehicles. It also finds applications in the manufacture of parts for boats or in the field of construction, in particular for the manufacture of screw bars for formwork.
- the invention can be implemented for the manufacture of all types of parts requiring to achieve the properties referred to
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Abstract
Description
Claims
Priority Applications (13)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
UAA201710001A UA118920C2 (uk) | 2015-03-23 | 2016-03-23 | Заготовки з бейнітною структурою, які мають високу міцність, і спосіб виготовлення |
CA2980878A CA2980878C (fr) | 2015-03-23 | 2016-03-23 | Pieces a structure bainitique a hautes proprietes de resistance et procede de fabrication |
BR112017020282-4A BR112017020282B1 (pt) | 2015-03-23 | 2016-03-23 | Peça e método de fabricação para uma peça |
EA201792077A EA201792077A1 (ru) | 2015-03-23 | 2016-03-23 | Заготовки с бейнитной структурой, имеющие высокую прочность, и способ изготовления |
US15/560,468 US12129527B2 (en) | 2015-03-23 | 2016-03-23 | Parts with a bainitic structure having high strength properties and manufacturing process |
EP16718723.6A EP3274483B1 (fr) | 2015-03-23 | 2016-03-23 | Pieces a structure bainitique a hautes proprietes de resistance et procede de fabrication |
MX2017012242A MX2017012242A (es) | 2015-03-23 | 2016-03-23 | Partes con una estructura bainitica que tiene propiedades de alta resistencia y proceso de fabricacion. |
CN201680017905.7A CN107371369B (zh) | 2015-03-23 | 2016-03-23 | 具有高强度特性的具有贝氏体组织的部件和制造方法 |
AU2016238510A AU2016238510B2 (en) | 2015-03-23 | 2016-03-23 | Parts with a bainitic structure having high strength properties and manufacturing process |
KR1020177026897A KR101887844B1 (ko) | 2015-03-23 | 2016-03-23 | 고강도 특성을 구비한 베이나이트의 구조를 갖는 부품 및 제조 방법 |
ES16718723T ES2748436T3 (es) | 2015-03-23 | 2016-03-23 | Piezas de estructura bainítica con altas propiedades de resistencia y procedimiento de fabricación |
JP2017549687A JP6625657B2 (ja) | 2015-03-23 | 2016-03-23 | 高強度特性を有するベイナイト系構造を有する部品および製造方法 |
PL16718723T PL3274483T3 (pl) | 2015-03-23 | 2016-03-23 | Elementy o strukturze bainitycznej mające właściwości wysokiej wytrzymałości oraz sposób wytwarzania |
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IBPCT/IB2015/000384 | 2015-03-23 | ||
PCT/IB2015/000384 WO2016151345A1 (fr) | 2015-03-23 | 2015-03-23 | Pieces a structure bainitique a hautes proprietes de resistance et procede de fabrication |
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WO2016151390A1 true WO2016151390A1 (fr) | 2016-09-29 |
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PCT/IB2015/000384 WO2016151345A1 (fr) | 2015-03-23 | 2015-03-23 | Pieces a structure bainitique a hautes proprietes de resistance et procede de fabrication |
PCT/IB2016/000343 WO2016151390A1 (fr) | 2015-03-23 | 2016-03-23 | Pieces a structure bainitique a hautes proprietes de resistance et procede de fabrication |
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PCT/IB2015/000384 WO2016151345A1 (fr) | 2015-03-23 | 2015-03-23 | Pieces a structure bainitique a hautes proprietes de resistance et procede de fabrication |
Country Status (15)
Country | Link |
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US (1) | US12129527B2 (fr) |
EP (1) | EP3274483B1 (fr) |
JP (1) | JP6625657B2 (fr) |
KR (1) | KR101887844B1 (fr) |
CN (1) | CN107371369B (fr) |
AU (1) | AU2016238510B2 (fr) |
BR (1) | BR112017020282B1 (fr) |
CA (1) | CA2980878C (fr) |
EA (1) | EA201792077A1 (fr) |
ES (1) | ES2748436T3 (fr) |
HU (1) | HUE045789T2 (fr) |
MX (1) | MX2017012242A (fr) |
PL (1) | PL3274483T3 (fr) |
UA (1) | UA118920C2 (fr) |
WO (2) | WO2016151345A1 (fr) |
Families Citing this family (5)
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WO2018215813A1 (fr) * | 2017-05-22 | 2018-11-29 | Arcelormittal | Procédé de fabrication d'une pièce en acier et pièce en acier correspondante |
WO2019180492A1 (fr) * | 2018-03-23 | 2019-09-26 | Arcelormittal | Pièce forgée en acier bainitique et son procédé de fabrication |
FR3123659A1 (fr) | 2021-06-02 | 2022-12-09 | Ascometal France Holding Sas | Pièce en acier mise en forme à chaud et procédé de fabrication |
CN115679089B (zh) * | 2022-10-27 | 2024-09-06 | 北京科技大学 | 调控前轴用低碳贝氏体非调质钢显微组织的控锻控冷工艺 |
CN117925963A (zh) * | 2023-12-14 | 2024-04-26 | 华北理工大学 | 一种超高强塑性超细贝氏体精轧螺纹钢及其制备方法 |
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- 2016-03-23 ES ES16718723T patent/ES2748436T3/es active Active
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- 2016-03-23 JP JP2017549687A patent/JP6625657B2/ja active Active
- 2016-03-23 CA CA2980878A patent/CA2980878C/fr active Active
- 2016-03-23 US US15/560,468 patent/US12129527B2/en active Active
- 2016-03-23 CN CN201680017905.7A patent/CN107371369B/zh active Active
- 2016-03-23 BR BR112017020282-4A patent/BR112017020282B1/pt active IP Right Grant
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EP0787812A1 (fr) | 1996-02-08 | 1997-08-06 | ASCOMETAL (Société anonyme) | Acier pour la fabrication de pièce forgée et procédé de fabrication d'une pièce forgée |
EP1201774A2 (fr) | 2000-10-25 | 2002-05-02 | Gohsyu Corporation | Procédé de forgeage |
US6558484B1 (en) * | 2001-04-23 | 2003-05-06 | Hiroshi Onoe | High strength screw |
WO2007074984A1 (fr) * | 2005-12-26 | 2007-07-05 | Posco | Vis en acier a tres haute resistance differee a la cassure differee et procede de fabrication |
WO2009138586A2 (fr) * | 2008-05-15 | 2009-11-19 | Arcelormittal Gandrange | Acier micro-allié pour forge à chaud de pièces mécaniques à hautes caractéristiques |
WO2014163431A1 (fr) * | 2013-04-05 | 2014-10-09 | 태양금속공업주식회사 | Procédé de fabrication de boulon de haute résistance mécanique et ayant une excellente résistance à la traction |
Also Published As
Publication number | Publication date |
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US12129527B2 (en) | 2024-10-29 |
KR20170118916A (ko) | 2017-10-25 |
CA2980878C (fr) | 2020-01-14 |
EP3274483A1 (fr) | 2018-01-31 |
CN107371369A (zh) | 2017-11-21 |
BR112017020282B1 (pt) | 2021-08-17 |
US20180057909A1 (en) | 2018-03-01 |
CN107371369B (zh) | 2019-06-21 |
KR101887844B1 (ko) | 2018-08-10 |
AU2016238510B2 (en) | 2019-09-19 |
EP3274483B1 (fr) | 2019-07-24 |
WO2016151345A1 (fr) | 2016-09-29 |
UA118920C2 (uk) | 2019-03-25 |
BR112017020282A2 (pt) | 2018-06-05 |
JP6625657B2 (ja) | 2019-12-25 |
AU2016238510A1 (en) | 2017-10-12 |
CA2980878A1 (fr) | 2016-09-29 |
MX2017012242A (es) | 2017-12-15 |
EA201792077A1 (ru) | 2018-01-31 |
JP2018512509A (ja) | 2018-05-17 |
PL3274483T3 (pl) | 2020-01-31 |
ES2748436T3 (es) | 2020-03-16 |
HUE045789T2 (hu) | 2020-01-28 |
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