CN103205653A - Duplex stainless steel with excellent thermoplasticity and corrosion resistance and manufacturing method thereof - Google Patents
Duplex stainless steel with excellent thermoplasticity and corrosion resistance and manufacturing method thereof Download PDFInfo
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Abstract
The present invention discloses a duplex stainless steel with excellent thermoplasticity and corrosion resistance and a manufacturing method thereof. The duplex stainless steel comprises chemical compositions of, by weight percentage, 0.01-0.06 % of C, 0.1-1.0 % of Si, 0.4-3.0 % of Mn, 17.5-20.5 % of Cr, 3.0-5.0 % of Ni, 0.1-0.18 % of N, 2.5-4.0 % of Mo,less than or equal to 0.005 % of S, less than or equal to 0.005 % B, less than or equal to 1.0 % of Cu, and the balance being Fe and inevitable impurities. According to the invention, a content of the Mo is increased to 2.5-4.0 %, a content of the Cr is reduced to 17.5-20.5 %, a content of the N is controlled at 0.1-0.18 %, and the trace elements S and B are also in control. The duplex stainless steel has excellent thermoplasticity and corrosion resistance, can be produced into hot-rolled and cold-rolled strip steels in mass and used in fields of construction, heat exchange, etc., and can partially replace costly 316 and 317 austenitic stainless steel.
Description
Technical field
The present invention relates to the duplex stainless steel field, relate in particular to a kind of have excellent heat plasticity and corrosion proof duplex stainless steel and manufacture method thereof.
Background technology
After the duplex stainless steel solution treatment, at room temperature formed by the austenite two-phase of about 50% ferrite and 50%.The existence of two-phase structure makes duplex stainless steel have the characteristics of ferritic stainless steel and austenitic stainless steel concurrently.Compare with austenitic stainless steel, the intensity of duplex stainless steel, particularly yield strength significantly improves, and intergranular corrosion resistance, anticorrosion stress-resistant, wear resisting property significantly improve.With the ferritic stainless steel ratio, its toughness raising, brittle transition temperature reduction, intergranular corrosion resistance and weldability are significantly improved, and have kept ferritic steel thermal conductivity height, advantage that the coefficient of expansion is little simultaneously.
Three important stages have been experienced in the development of duplex stainless steel up to now.The trade mark of developing before 1971 is first-generation duplex stainless steel, because the restriction of smelting condition, the content of C, N all can't accurately be controlled, and its welding back performance sharply descends.The trade mark of exploitation in 1971～1989 years belongs to s-generation duplex stainless steel, and representing steel grade is S32205.By means of invention and the application of nineteen sixty-eight stainless steel precision sweetening process-argon oxygen decarburization (AOD), can make that nitrogen content significantly improves in the duplex stainless steel, carbon content is accurately controlled, thereby significantly improves weld seam, the toughness of heat affected zone and corrosion resistance nature.Nitrogen alloying has improved s-generation duplex stainless steel use properties greatly, makes dual phase steel be widely used in a plurality of fields such as chemical industry, papermaking, pressurized vessel.The trade mark that occurs after nineteen ninety is third generation duplex stainless steel, and its development presents 2 kinds of trend.Improve on the one hand further steel interalloy element particularly the content of Cr, Mo, N to obtain more high strength and superior corrosion resistance energy more, as super-duplex stainless steel SAF2906 and the SAF3207 of Sweden SANDVIK exploitation.Then develop low nickel content on the other hand, do not contain Mo or only contain the economical diphase stainless steel of a small amount of Mo, to reduce cost, as LDX2101 etc.
No matter for classical duplex stainless steel, economical diphase stainless steel, or super-duplex stainless steel, thermoplasticity is relatively poor to be the difficult problem that must face in its manufacturing processed.Especially in the operation of rolling of coil of strip, serious cracking can take place in the steel flanging part, has a strong impact on continuity and the mass-producing of processing and manufacturing, has reduced lumber recovery, has improved production cost, is unfavorable for the large-scale application of duplex stainless steel.
Duplex stainless steel thermoplasticity is relatively poor, and major cause is that austenite is different with the deformational behavior of ferritic phase in the hot procedure.The softening mechanism of ferrite when distortion is dynamic recovery, even if also can take place under very low strain; Austenite then is the dynamic recrystallization after strain is higher than certain threshold value.Because ferritic phase is " soft " more, so stress and strain tends to concentrate in the ferritic phase, and distribution inhomogeneous in this two-phase causes easily in phase boundary crack nucleation and expansion.Therefore, thereby how making the softening tendency of two-phase approach to make the more even distribution of stress and strain, is the important channel of improving duplex stainless steel thermoplasticity.
Practice shows that the Cr element will reduce ferritic high temperature deformation drag, also namely accelerates softening under the ferrite high temperature.Therefore, duplex stainless steel thermoplasticity be improved, Cr content can be reduced.But Cr is the key element that determines the stainless steel corrosion resistance nature, according to the calculating of the equivalent of anti-spot corrosion PREN value:
PREN=Cr%+3.3Mo%+30N%-Mn% (1)
Cr content reduces the corrosion resistance nature with the remarkably influenced duplex stainless steel.Cr also is important austenite stable element in addition, according to Ms and Md
30/50Calculating:
M
s=1305-61.6Ni%-41.7Cr%-33.3Mn%-27.8Si%-1667(C+N)% (2)
Md
30/50=580-520C%-2Si%-16Mn%-16Cr%-23Ni%-300N%-26Cu%-10Mo% (3)
In the formula (2), M
sFor be in the process of cooling austenite to the beginning temperature spot of martensitic transformation;
In the formula (3), Md
30/50Be to weigh in the deformation process austenite to the temperature spot of martensitic transformation.
The Mo element can improve ferrite high temperature deformation drag, so molybdenum also can accelerate softening under the ferrite high temperature.Consider that molybdenum is poly-partially in ferrite, the Mo content that increases in the duplex stainless steel can improve its thermoplasticity.According to formula (1), Mo can significantly improve the corrosion resistance nature of material.
N is one of most important alloying element in the duplex stainless steel.N can improve the resistance to deformation under the austenite high temperature, makes under the austenite high temperature more " firmly "; N is segregated in the austenite in addition, therefore reduces the thermoplasticity that N content can improve duplex stainless steel.Calculation formula according to the austenite equivalent:
Ni
eq=Ni+30(C＋N)+0.5Mn+0.25Cu (4)
N is very strong austenite former, and it has formed austenitic ability is 30 times of Ni.Simultaneously by formula (1) as can be known, N can significantly improve the PREN value of material, thereby is conducive to improve the solidity to corrosion of duplex stainless steel steel.From formula (2), formula (3) as can be known, N can improve austenitic stability.In addition, also be the key element that guarantees the duplex stainless steel welding property.
Mn is alloying element cheaply, but the duplex stainless steel corrosion resistance nature of Mn has disadvantageous effect, and as shown in Equation (1), namely the manganese of every interpolation 1% will make alloy PREN value reduce by 1.If guarantee the superior corrosion resistance energy of material, must its content of control.The reason that Mn influences pitting corrosion resistance is that manganese and sulphur form MnS, or along with manganese amount in the steel increases, the chrome content among the MnS reduces, and caused MnS is mixed in the dissolving in the corrosive medium, usually becomes the starting point of spot corrosion, crevice corrosion.
Cu can reduce the thermoplasticity of duplex stainless steel, thereby major cause is the segregation meeting of Cu to be formed low melting point form formation of crack mutually in hot procedure.Cu also is austenite former, and by formula (4) as can be known, the austenite formation ability of Cu has only 1/4 of nickel.From formula (2), formula (3) as can be known, a very important effect of Cu is stable austenite, reduces the work hardening tendency, thereby improves stainless plasticity.But the Cu too high levels can cause thermoplasticity to descend in the duplex stainless steel.
No matter be economical diphase stainless steel or super-duplex stainless steel, the corresponding austenitic stainless steel of corrosion resisting property is better, and cost of alloy also significantly reduces.But because thermoplasticity is relatively poor, so efficient is low, lumber recovery is low, production is subjected to a lot of restrictions, and its synthesized competitiveness descends on the contrary.
US Patent No. 4798635 is classical economical diphase stainless steels.For saving bullion content, its Mo is usually about 0.3%; Ni content is usually about 4%; In order to improve solidity to corrosion, Cr is increased to general control about 23%.Because Cr content height and Mo content is low, its thermoplasticity is relatively poor.
Chinese patent CN101090988 and US Patent No. 6551420B1 also belong to economical diphase stainless steel.For improving corrosion resistance nature, CN101090988 is increased to Mo content about 1%, and US6551420B1 is increased to Mo content about 1.5%; The two Cr content is all controlled about 21%.For guaranteeing to balance each other with stable mutually, its N content control is about 0.17%.The thermoplastic property of these two kinds of duplex stainless steels all makes moderate progress slightly.
US Patent No. 4765953A is a kind of super-duplex stainless steel.In order to improve solidity to corrosion, its Mo content greater than 3.5%, Cr content greater than 23%; For guarantee to balance each other, phase stability and solidity to corrosion, its N content is greater than 0.25%.High alloy content causes its thermoplasticity significantly to descend, and has improved manufacture difficulty and cost greatly.
Be to obtain the highly corrosion resistant performance, US Patent No. 2007089810 is increased to Mo content more than 5%, and Cr content is greater than 24%, for guarantee to balance each other, phase stability, with the control of N content more than 0.28%.In order to remedy the main alloy element design to thermoplastic disadvantageous effect, further the control by micro-S, B, Ru improves thermoplasticity.
The Mo content of US Patent No. 5733387A is about 1.5%, and Cr content is about 25%; For improving thermoplasticity, its N content control is between 0.13%～0.3%, and further the control by B, S, Ce improves thermoplasticity.
The exploitation of existing duplex stainless steel mainly contains two kinds of thinkings, a kind of by reducing precious metal such as Ni, the lower cost of Mo content acquisition, as Chinese patent CN101090988 and US Patent No. 6551420B1 and US Patent No. 4798635, but in order to obtain good corrosion resistance energy and phase stability on this basis, then to improve Cr content and N content, cause thermoplastic property to descend; Another kind is highly corrosion resistant performance duplex stainless steel, further improves Cr content and Mo content in the alloy, for guaranteeing the stability of phase, needs to add very high N content, as US Patent No. 4765953A, causes thermoplastic property to descend.In order to solve the problem in the processing and manufacturing process, usually can be by adding elements such as B, Ce, Ca to improve thermoplastic property, as Chinese patent US2007089810 and US Patent No. 5733387A.
More than all duplex stainless steels patent otherwise thermoplasticity is not designed especially, though or the thermoplasticity generation that makes moderate progress but still be difficult to avoid the hot rolling limit to be split, be difficult to obtain simultaneously high anti-corrosion can and good thermoplastic make performance.
Summary of the invention
The object of the invention is to provide a kind of have excellent heat plasticity and corrosion proof duplex stainless steel and manufacture method thereof, have good thermoplasticity, corrosion resistance nature, be fit to carry out on a large scale the production of hot rolling and cold rolling roll bending, replace 316,317 austenitic stainless steels at specific areas such as building, heat exchanges.
The present invention is for improving thermoplasticity, and the Alloy Elements Mo that will be conducive to duplex stainless steel thermoplasticity improves, and is unfavorable for that thermoplastic alloying elements cr, N reduce, and controls the content of micro-S, B.Simultaneously, this dual-phase stainless steel hot edging splits tendency significantly to be reduced, and has good corrosion resistance nature.
To achieve these goals, the present invention adopts following technical scheme:
A kind of have excellent heat plasticity and a corrosion proof duplex stainless steel, the weight percent of its chemical ingredients is: C:0.01～0.06%, Si:0.1～1.0%, Mn:0.4～3.0%, Cr:17.5～20.5%, Ni:3.0～5.0%, N:0.1～0.18%, Mo:2.5～4.0%, S≤0.005%, B≤0.005%.Cu is optional element, its content≤1%, and all the other are Fe and unavoidable impurities; Its metallographic structure is made up of ferrite and austenite, and the austenite ratio is 40～60%(volume percent).
Of the present invention have excellent heat plasticity and corrosion proof duplex stainless steel for obtaining good thermoplasticity, and Mo content is increased to 2.5～4%, and Cr content is reduced to 17.5～20.5%, and N content is controlled 0.1～0.18%, and Cu content is controlled below 1%.Simultaneously, the control content of elements, S≤0.005%, and add micro-B.In order to guarantee to balance each other and phase stability, Ni content is controlled 3～5%.The duplex stainless steel that obtains has excellent thermoplasticity, corrosion resistance nature and hot rolling limit simultaneously and splits over-all propertieies such as the remarkable reduction of tendency.
Manufacture method with excellent heat plasticity and corrosion proof duplex stainless steel of the present invention comprises the steps:
(1) smelt: smelt the acquisition molten steel by the proportioning of above-mentioned chemical ingredients, smelting process can select vacuum induction to smelt, or electric furnace-argon oxygen decarburization AOD smelts or electric furnace-argon oxygen decarburization AOD-external refining LF stove is smelted;
(2) casting: molten steel is carried out die casting obtain strand or carry out continuous casting to obtain slab, the control superheating temperature is 20～50 ℃ during die casting; Or adopt cooling rate continuous cast method faster, and avoid the effusion of nitrogen, the control superheating temperature is 20～50 ℃ during continuous casting, the slab pulling rate is 0.8～2m/min;
(3) heating, forging and/or hot rolling: after die casting strand or continuous casting steel billet put into process furnace and be heated to 1100～1250 ℃ and insulation, forge to required specification at forging line, or be hot-rolled down to required specification at the hot rolling unit, or first the forging afterwards is hot-rolled down to required specification, anneal then or annealing and pickling, its annealing temperature control is at 1020～1130 ℃, austenite ratio after the annealing is 40～60%, obtain described have excellent heat plasticity and corrosion proof duplex stainless steel, its metallographic structure is made up of ferrite and austenite, and the austenite ratio is 40～60%.
Described manufacture method with excellent heat plasticity and corrosion proof duplex stainless steel, also comprise cold rolling and cold rolling after annealing pickling or clean annealing step: the coil of strip that step (3) is obtained or steel plate are cold-rolled to required than minimal thickness at cold rolling unit, carry out annealing and pickling or clean annealing then, annealing temperature control is at 1020～1130 ℃, and the austenite ratio after the annealing is 40%～60%.
Preferable, in the step (3), in hot procedures such as forging, hot rolling, because the material deformation drag is bigger, therefore needing to reduce the deflection of single hot-roll, the temperature of control finish-forging or finish to gauge is more than 950 ℃; Or the mode that adopts two fire to forge.
Preferable, in the step (4), in cold-rolled process, the distortion of materials drag is bigger, and therefore the deflection of a rolling process need be controlled within 50～70%, carries out cold rolled annealedly then, eliminates stress, and reduces hardness, just can carry out the rolling of minimal thickness more.
In the design of chemical composition with excellent heat plasticity and corrosion proof duplex stainless steel of the present invention:
Carbon: carbon is strong austenite former, and from formula (4) as can be known, its austenite formation effect is equivalent to 30 times of Ni, therefore can replace Ni to a certain extent, promotes the formation of austenite structure.In addition, from formula (2) and formula (3) as can be known, carbon is very strong austenite stable element, can suppress austenitic phase transformation.But when carbon content is too high, form rich chromium carbide at crystal boundary after carbon is combined with chromium, cause intergranular corrosion.Especially in welding process, carbide is separated out rapidly, will cause the corrosion resistance nature of welding zone and mechanical property significantly to descend.Cross low carbon content and will increase difficulty and cost in the preparation process.Therefore, carbon content is controlled to be 0.01～0.06% in the steel of the present invention.
Silicon: silicon is to be good deoxidant element in the Manufacture Of Iron And Steel By Melting process, contains the silicon more than 0.1% in the therefore general dual phase steel.In duplex stainless steel, silicon is ferrite former, and the silicone content raising needs to improve nickel content and increases cost.Silicon can accelerate separating out of intermetallic phase in addition, and is unfavorable for manufacturing and use.Therefore, silicone content is controlled to be 0.1～1.0% in the steel of the present invention.
Manganese: manganese is that a kind of more weak relatively austenite forms and stable element, as seen from formula (4), can utilize manganese to replace nickel to a certain extent.But manganese all is negative to the influence of stainless erosion resistance basically.According to the experimental formula (1) of the anti-pitting attack performance of stainless steel, the manganese of every interpolation 1% will make alloy PREN value reduce by 1, be equivalent to offset the raising of the pitting resistance of Cr that adds 0.3% Mo or 1%.For taking into account the corrosion resistance nature of material, emphasis control Mn content is 0.4%～3.0% in the steel of the present invention.
Chromium: chromium is most important element in the stainless steel.Chromium is to determine the corrosion proof main element of stainless steel, also is a kind of ferrite former, but the while stable austenite.For duplex stainless steel, when chromium content is low, solidity to corrosion will descend, reduce the stability of organizing simultaneously, and will be all unfavorable to mechanics and corrosion resistance nature, so Cr content of the present invention is minimum is controlled to be 17.5%.But when the chromium too high levels, not only can increase the tendency of separating out of intermetallic phase, carbide and nitride, increase cost, the more important thing is the thermoplasticity that can reduce duplex stainless steel.Therefore in the steel of the present invention the highest control of Cr content 20.5%.
Nitrogen: the nitrogen element is important element indispensable in the modern duplex stainless steel.At first N is a kind of formation and stable austenite element mutually.In austenite equivalent calculation formula (4), the austenite formation ability of nitrogen is 30 times of nickel.According to formula (2) and formula (3), nitrogen also is a kind of very strong austenite stable element.In addition, nitrogen can improve the corrosion resistance nature of austenite phase, especially anti-pitting attack performance and slit and corrosion resistant performance, and in the calculation formula (1) of PREN value, its equivalent of anti-the spot corrosion is 30 times of chromium.Although as above advantage is arranged, nitrogen can significantly reduce the thermoplasticity of duplex stainless steel.Therefore, nitrogen in steel content control of the present invention is 0.1～0.18%.
Molybdenum: molybdenum is very beneficial for improving the corrosion resistance nature of steel, especially with the situation of chromium compound action under.According to RREN value calculation formula (1), its equivalent of anti-the spot corrosion is 3.3 times of chromium.What is more important, Mo can improve the thermoplasticity of duplex stainless steel, therefore Mo content is controlled more than 2.5%.But the molybdenum too high levels will cause between friable metal the acceleration of phase to be separated out, and be unfavorable for producing and using, so the control of the molybdenum content in the steel of the present invention be below 4.0%.
Copper: copper is a kind of more weak austenite former, and in addition, the adding of copper can improve the erosion resistance of dual phase steel in reductive acid.What is more important, from formula (2) and (3) as can be known, Cu is the alloying element of stable austenite, can reduce austenitic cold hardening speed.But be unfavorable for thermoplasticity during the copper too high levels.Therefore Cu content is controlled below 1.0% in the steel of the present invention.
Boron: boron also is one of optional element of the present invention.Boron can be filled the crystal boundary room in the crystal boundary enrichment, thereby suppresses crack propagation, and therefore the adding of micro-B can improve the thermoplasticity of duplex stainless steel.But the B too high levels can cause forming in the duplex stainless steel compound of B, seriously reduces plasticity and the toughness of material.The control of B content is below 0.005% among the present invention.
Sulphur: sulphur is very big for the thermoplasticity harm of duplex stainless steel, so will reduce the S content in the duplex stainless steel as far as possible, S control is below 0.005% among the present invention.
The present invention compared with prior art has the following advantages:
(1) duplex stainless steel of the present invention controls to 0.4～3.0% with Mn content, has reduced the disadvantageous effect of manganese to corrosion resistance nature effectively; Mo content is increased to more than 2.5%, nitrogen content control 0.1～0.18%, is guaranteed that the PREN value of material is higher, especially anti-spot corrosion and stress corrosion performance;
(2) duplex stainless steel of the present invention reduces Cr content to 17.5～20.5%, improves Mo content to 2.5%～4%, and She Ji N content is moderate simultaneously, is 0.1～0.18%.In addition, add the B of trace, and control S content, thereby significantly improve the thermoplasticity of material, make material in course of hot rolling not the limit split or small limit only occurs and split.
(3) duplex stainless steel of the present invention can utilize existing stainless steel production line to produce in batches, its preparation method casting after vacuum induction furnace, electric furnace-AOD stove smelting or electric furnace-AOD-LF stove are smelted, and the control superheating temperature is about 20～50 ℃ when die casting; Or the employing continuous cast method, for avoiding the effusion of nitrogen, the control superheating temperature is 20～50 ℃ during continuous casting, the slab pulling rate is 0.8～2m/min.Therefore material has thermoplasticity and cold-forming property preferably, can carry out the production of hot rolling and cold rolling coil, plate etc.Hot rolling and the control of cold rolling annealing temperature are between 1020～1100 degree, and the austenite ratio that obtains after the annealing is 40～60%.
Description of drawings
Fig. 1 is the alloy metallographic structure picture of the duplex stainless steel of the embodiment of the invention 1.
Embodiment
Below in conjunction with specific embodiment technical scheme of the present invention is described in further detail.
Embodiment 1
Production Flow Chart with vacuum metling-die casting-forging-hot rolling-annealing and pickling is example: raw material is added vacuum smelting furnace smelt, strict control raw material purity is to obtain design mix (as shown in table 1); Molten steel is poured in the mold, obtained the 50Kg steel ingot, the superheating temperature of casting is 20～50 ℃.Steel ingot is forged, 1100～1250 ℃ of Forge Heating temperature, forging back thickness is 40mm.Forging stock is rolling on reversible hot rolling mill, and Heating temperature is 1100～1200 ℃, is rolled to 4mm, and situation is split on the limit of measuring after the hot rolling.Hot-rolled sheet is annealed, and annealing temperature is controlled at 1020～1100 ℃, and the austenite ratio is 40～60% in the tissue of annealing back, obtains present embodiment and has excellent heat plasticity and corrosion proof duplex stainless steel.
Table 1 is the alloy composition of each embodiment duplex stainless steel, and has provided economical diphase stainless steel S32304 as a comparison case simultaneously, and the chemical ingredients of wishing the 316L austenitic stainless steel that substitutes in certain fields with steel grade of the present invention.
The two-phase stainless steel of present embodiment is carried out the solidity to corrosion test, and its corrosion resisting property is by the CPT(critical pitting temperature) characterize, measurement standard is ASTM G48-99, test result is as shown in table 1.
Embodiment 1 duplex stainless steel is detected, the metallographic structure of its alloy as shown in Figure 1: will sample carry out electrolytic corrosion after polishing and the polishing, etching reagent is 40g KOH+100ml H
2O, corrosion current 0.3～0.8A/cm
2, under metaloscope, by the quantitative metallography method austenite ratio is analyzed at last.Black is organized as ferrite among Fig. 1, and white is organized as austenite, and austenite accounts for 45% mutually.
The present embodiment steel situation that the limit is split in course of hot rolling is as shown in table 2.
Embodiment 2～8
Embodiment 2～8 duplex stainless steels are made acquisition according to the manufacture method of embodiment 1.
The alloy composition of each embodiment duplex stainless steel is as shown in table 1.
The two-phase stainless steel of each embodiment is carried out the solidity to corrosion test, and its corrosion resisting property is by the CPT(critical pitting temperature) characterize, measurement standard is ASTM G48-99, test result is as shown in table 1.
The duplex stainless steel of each embodiment is detected the metallographic structure that obtains each embodiment alloy: will carry out electrolytic corrosion after sample polishing and the polishing, etching reagent is 40g KOH+100ml H
2O, corrosion current 0.3～0.8A/cm
2, under metaloscope, by the quantitative metallography method austenite ratio is analyzed at last; Black is organized as ferrite, and white is organized as austenite, and austenite accounts for 40～60% mutually.
Each embodiment steel situation that the limit is split in course of hot rolling is as shown in table 1.
By the visible duplex stainless steel of the present invention of table 1 because Mo content is increased to 2.5～4%, Cr content is reduced to 17.5～20.5%, the control of N content is 0.1～-0.18%, control micro-S and B simultaneously, its thermoplasticity significantly improves, hot rolling is boundless split or only slight limit split, and have good corrosion resisting property.
Table 1 unit: weight percent
Table 2
Above-described embodiment can not be interpreted as limiting the scope of the invention, and those skilled in the art do nonessential improvement and adjustment according to foregoing to the present invention, under the situation that does not break away from inventive concept, still belongs to protection scope of the present invention.
Claims (6)
1. one kind has excellent heat plasticity and corrosion proof duplex stainless steel, the weight percent of its chemical ingredients is: C:0.01～0.06%, Si:0.1～1.0%, Mn:0.4～3.0%, Cr:17.5～20.5%, Ni:3.0～5.0%, N:0.1～0.18%, Mo:2.5～4.0%, S≤0.005%, B≤0.005%, all the other are Fe and unavoidable impurities; Its metallographic structure is made up of ferrite and austenite, and the austenite ratio is 40～60%.
2. as claimed in claim 1 have excellent heat plasticity and a corrosion proof duplex stainless steel, it is characterized in that, also comprises Cu≤1%, by weight percentage.
3. the manufacture method with excellent heat plasticity and corrosion proof duplex stainless steel as claimed in claim 1 or 2 comprises the steps:
(1) smelt: smelt the acquisition molten steel by the proportioning of above-mentioned chemical ingredients, smelting process adopts vacuum induction to smelt, or electric furnace-argon oxygen decarburization AOD smelting, or electric furnace-argon oxygen decarburization AOD-external refining LF stove is smelted;
(2) casting: molten steel is carried out die casting obtain strand, the control superheating temperature is 20～50 ℃ during die casting; Or molten steel is carried out continuous casting obtain slab, the control superheating temperature is 20～50 ℃ during continuous casting, the slab pulling rate is 0.8～2m/min;
(3) heating, forging and/or hot rolling: after die casting strand or continuous casting steel billet put into process furnace and be heated to 1100～1250 ℃ and insulation, forge to required specification, or be hot-rolled down to required specification, or first the forging afterwards is hot-rolled down to required specification, anneal then or annealing and pickling, annealing temperature control is at 1020～1130 ℃, austenite ratio after the annealing is 40～60%, obtain described have excellent heat plasticity and corrosion proof duplex stainless steel, its metallographic structure is made up of ferrite and austenite, and the austenite ratio is 40～60%.
4. the manufacture method with excellent heat plasticity and corrosion proof duplex stainless steel as claimed in claim 3, it is characterized in that, also comprise cold rolling and cold rolling after annealing pickling or clean annealing step: the coil of strip that step (3) is obtained or cold-rolling of steel plate are to desired thickness, carry out annealing and pickling or clean annealing then, annealing temperature control is at 1020～1130 ℃, and the austenite ratio after the annealing is 40%～60%.
5. the manufacture method with excellent heat plasticity and corrosion proof duplex stainless steel as claimed in claim 4 is characterized in that, in cold-rolled process, the deflection of a rolling process is controlled within 50～70%.
6. as claim 3 or 4 described manufacture method with excellent heat plasticity and corrosion proof duplex stainless steel, it is characterized in that in the step (3), in forging and/or the course of hot rolling, the temperature of control finish-forging or finish to gauge is more than 950 ℃; Or the modes of two fire forgings are adopted in forging.
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| CN115011772A (en) * | 2022-04-18 | 2022-09-06 | 钢铁研究总院有限公司 | Method for refining ferrite grain size in duplex stainless steel and duplex stainless steel |
| CN115011772B (en) * | 2022-04-18 | 2024-01-02 | 钢铁研究总院有限公司 | Method for refining ferrite grain size in duplex stainless steel and duplex stainless steel |
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