CN106399854B - The excellent non magnetic steel plate of high manganese of stress corrosion dehiscence resistant and its manufacturing method - Google Patents

The excellent non magnetic steel plate of high manganese of stress corrosion dehiscence resistant and its manufacturing method Download PDF

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CN106399854B
CN106399854B CN201610466971.4A CN201610466971A CN106399854B CN 106399854 B CN106399854 B CN 106399854B CN 201610466971 A CN201610466971 A CN 201610466971A CN 106399854 B CN106399854 B CN 106399854B
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steel plate
stress corrosion
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temperature
cooling
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CN106399854A (en
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刘自成
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Baoshan Iron and Steel Co Ltd
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Baoshan Iron and Steel Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • C21D2211/001—Austenite

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Soft Magnetic Materials (AREA)

Abstract

The excellent non magnetic steel plate of high manganese of stress corrosion dehiscence resistant and its manufacturing method, the present invention do not add expensive alloying elements Ni using in the component system of the low Al high N alloyings of low C high Mn high Cr, control stabilization of austenite Index A u × TRH>=1300,0.65≤[(%Cr)/(%Mn)] × (%C) × VC≤ 2.75, optimize press quenching technique, it is uniform fine austenite tissue to make the microscopic structure of finished steel plate, 6 grades of autstenitic grain size >=ASTM, high intensity (tensile strength >=800MPa), excellent non magnetic (magnetic permeability≤1.0 μ), stress corrosion resistant (SCC crack depths are 0mm) steel plate are obtained, especially suitable for being electromagnetically shielded the manufacture of steel component.

Description

The excellent non magnetic steel plate of high manganese of stress corrosion dehiscence resistant and its manufacturing method
Technical field
The present invention relates to a kind of excellent non magnetic steel plate of high manganese of stress corrosion dehiscence resistant (SCC) and its manufacturing methods, should Steel plate has high intensity (tensile strength >=800MPA), excellent non magnetic (magnetic permeability≤1.00 μ), stress corrosion dehiscence resistant The features such as (SCC crack depths are 0mm, i.e. stress corrosion cracking (SCC) does not occur for steel plate random corrosion section).
Background technology
It is well known that for SUS304 systems stainless steel, the high non magnetic steel plate of manganese systems is cheap (to be free of valuable conjunction Gold element Ni), intensity it is high and in the various non magnetic stability of characteristics of cold and hot working process light plate, thus obtain high-volume and make extensively With；As China's equipment manufacture is fast-developing in recent years, the manufacture and type of all kinds of non magnetic steel components of key are increasingly Expand and various in style, non magnetic steel plate demand and comprehensive performance are also increasingly improved；But in environment and the dual system of resource Under about, high-volume, the non magnetic steel plate of low cost manufacturing high-performance are very urgent.
Austenite stainless steel plate SUS304 or SUS316 have excellent non magnetic and stress corrosion resistant characteristic and obtain It is widely used；But the manufacturing cost (expensive alloying elements Ni contents reach 9% or more) and generation that austenite stainless steel plate is high The big ups and downs of boundary's Ni prices, austenite stainless steel plate cost risk is almost uncontrollable, secondly austenite stainless steel plate intensity It is relatively low, it more needs the non magnetic steel component of higher intensity level unusable or the size by increasing steel component liquidates Austria The low-intensity characteristic of family name's body stainless steel plate, thus further improve steel component manufacture difficulty and cost.The high manganese systems of tradition are non- Magnetic steel plate due to non magnetic stability of characteristics during cheap, intensity are high and process and by favor (referring to《Iron と Steel》, 66, S1084 (1980)；《Sumitomo Metal Industries》, 35,7 (1983)；J.Mat.,4,646(1969)).
There are apparent gaps compared with austenitic stainless steel for the non magnetic steel plate corrosion resistance of the high manganese systems of what is more important, especially Under its neutral aqueous solution environment under the conditions of by tensile stress, steel component stress corrosion resistant characteristic (i.e. SCC) is excessively poor, makes Lead to steel component failure (Werkstoffe along the excellent corrosion cracking of austenite grain boundary with easily generating in the process u.Korrosion,11,984(1972)；Proc.of the EPRI WS on the Rotor Forgings for Turbines and Generators,Palo Alto,Sept.14-17；《Fang Erosion Ji Intraoperative》, 21,157 (1972)).
The current high non magnetic steel component of manganese systems is all made of external coating mode and is used, but external coating technique is multiple Miscellaneous, manufacturing cost is high and pollution environment, and what is more important external coating durability is poor, and regular application is needed to safeguard, and safeguards Less than position be easy in a short time generate stress corrosion and cause steel component to scrap, influence operational efficiency and the longevity of equipment Life；Exploitation and austenite stainless steel plate are corrosion-resistant, the anti-comparable high non magnetic steel plate of manganese systems of SCC characteristics has been very urgent.
Invention content
The purpose of the present invention is to provide a kind of excellent non magnetic steel plate of high manganese of stress corrosion dehiscence resistant (SCC) and its systems Method is made, which has high intensity (tensile strength >=800MPa), excellent non magnetic (magnetic permeability≤1.00 μ), resistance to stress It is the features such as corrosion cracking (SCC crack depths are 0mm, i.e. stress corrosion cracking (SCC) does not occur for steel plate random corrosion section), especially suitable Manufacture for being electromagnetically shielded steel component.
In order to achieve the above objectives, the technical scheme is that：
It is first not add precious alloy using in the component system of the low Al- high N alloyings of low C- high Mn- high Cr- by the present invention Plain Ni, control stabilization of austenite Index A u × TRH>=1300,0.65≤[(%Cr)/(%Mn)] × (%C) × VC≤ 2.75, Optimize press quenching (i.e. DQ) technique.
Specifically, the non magnetic steel plate of high manganese that stress corrosion dehiscence resistant of the present invention is excellent, composition by weight percent are：
C：0.05%~0.10%
Si：≤ 0.30%
Mn：14.00%~20.00%
P：≤ 0.013%
S：≤ 0.0050%
Cr：13.00%~17.00%
N：0.20%~0.45%
Al：0.015~0.045%
Ca：0.0015%~0.0040%,
Remaining is Fe and inevitable impurity；And above-mentioned constituent content must simultaneously meet following relationship：
Au×TRH≥1300：Wherein, Au be stabilization of austenite index, Au=2.54+40.53 [(%C)+(%N)]+ 0.43 [(%Cu)+(%Ni)+(%Mn)] -0.22 (%Al) -2.64 [(%P)+(%S)] -1.26 [(%Cr)+(%Mo)] - (%Si)；TRHFor slab heating temperature, unit is DEG C；
0.65≤[(%Cr)/(%Mn)] × (%C) × VC≤2.75；Wherein, VCAccelerate for press quenching cooling velocity Cooling velocity, unit be DEG C/s.
The microscopic structure of finished steel plate of the present invention is uniform fine austenite tissue, 6 grades of autstenitic grain size >=ASTM.
Tensile strength >=800MPa of finished steel plate of the present invention, the μ of magnetic permeability≤1.00, stress corrosion resistant SCC crack depths For 0mm.
In the composition design of steel plate of the present invention：
C element, which has, improves armor plate strength, expansion and stable austenite phase and the nonmagnetic effect of steel sheet；But steel When middle C content is excessively high, the carbide Cr of a large amount of chromium is easily formed at austenite grain boundary23C6, austenite grain boundary is caused to be formed about Cr depletion zone causes stress corrosion cracking (i.e. SSC) to generate；To prevent austenite grain boundary type SSC from occurring, the C content upper limit should not surpass Cross 0.10%；Certain too low C content is unfavorable for expansion and stable austenite phase, the non magnetic characteristic of steel plate is damaged, therefore, in steel C content lower limit not preferably less than 0.05%.
Although Si elements can improve armor plate strength, Si elements are ferrite stabilizers, excessively high Si contents Weaken the stability of austenite and, what is more important Si raising C activity in austenite unfavorable to the non magnetic characteristic of steel plate Coefficient (activity for improving C in steel), promotes carbide Cr23C6It is formed, easily causes the non magnetic steel plate sensitization of high manganese, deteriorate steel plate Stress corrosion dehiscence resistant (SSC) characteristic, therefore the Si contents of the non magnetic steel plate of high manganese should not be higher, Si contents, which control, in steel exists 0.30% or less.
Mn elements are strong austenite stabilizer elements, have the function of expansion and stable austenite phase, are that acquisition is non magnetic The decision alloying element of steel plate, and with the increase of Mn contents in steel, the non magnetic characteristic of steel plate is constantly improve, especially in low temperature Under the conditions of, high Mn content is therefore stable non magnetic in order to obtain to improving and keeping the non magnetic characteristic of steel plate main to closing Characteristic, Mn contents must not be less than 14% in steel；But with the increase of Mn contents in steel, steel plate stress corrosion dehiscence resistant characteristic (SSC) continuous worsening, especially when Mn contents be higher than 20% when, steel plate along crystal boundary type stress corrosion dehiscence resistant characteristic (SSC) drastically Deteriorate.
P element has larger detrimental effect, theoretically requires P as the mechanical performance being mingled with to steel plate is harmful in steel More lower, better；But consider operability and cost of steelmaking, P content needs to control≤0.013%.
S elements are very big as harmful mechanical performance and stress corrosion dehiscence resistant damage being mingled with to steel plate in steel, especially exist It forms easily formation strip MnS under the conditions of high Mn content, in steel to be mingled with, serious deterioration steel plate stress corrosion dehiscence resistant (SSC) is special Property, theoretically require S more lower better；But consider operability and cost of steelmaking, S contents need control≤ 0.0050%.
Cr elements are the key alloying elements that the non magnetic steel plate of high manganese obtains stress corrosion dehiscence resistant (SSC) characteristic, with Cr constituent contents increase in steel, and stress corrosion dehiscence resistant (SSC) characteristic of steel plate is constantly improve, when Cr contents reach 13% in steel When, steel plate stress corrosion dehiscence resistant (SSC) characteristic reaches saturation state, i.e. complete passivation occurs for surface of steel plate, and corrosion spalling is not Occur again, steel plate stress corrosion cracking stops occurring；But since Cr is ferrite stabilizer, when Cr contents are more than 17% When, start ferritic phase occur in steel, the non magnetic characteristic of steel plate starts to deteriorate；Therefore Cr contents must not exceed 17% in steel.
N element is strong austenite stabilizer element, as N element increases in steel, austenite phase field expansion, stability in steel Reinforce, the non magnetic characteristic of steel plate improves；In addition, with N content increase in steel, surface of steel plate amorphous passivation layer formation difficulty drop Low, compactness improves and (hinders H, O grain boundary decision and aggregation into steel), further improves steel plate anticorrosion properties, improves indirectly Anti- steel plate stress corrosion cracking, theoretically the higher the better for leaded wastewater in steel, but when N content is excessively high in steel (more than 0.45% When), (L → δ) generates nitrogen pore during molten steel solidification, therefore rationally Control of Nitrogen Content between 0.20%~0.45%.
Al elements are added as deoxidant element in steel, in order to which deoxidation is clean and the intrinsic fine-grained steel of austenite, under Al Must not limit and be less than 0.015%, it is contemplated that the steel grade is high nitrogen-containing steel, and excessive Al content can consume a large amount of N, cause in steel Effective N content declines, and a large amount of AlN, which are precipitated, also in what is more important on austenite grain boundary can deteriorate the anti-steel plate stress corrosion of steel plate Crack (SSC) characteristic, therefore the Al content upper limit must not be higher than 0.045%.
Ca processing is carried out to steel, on the one hand can further take off S and pure molten steel, purification and reinforcing austenite grain boundary change The mechanical property of kind steel plate；On the other hand denaturation treatment is carried out to sulfide in steel, be allowed to become non-deformable, stablize it is tiny Spherical sulfide, inhibit S red brittleness, improve steel plate cold and hot working characteristic, secondly by sulfide in Spheroidized Steels, reduce length The MnS of strip is mingled with, and high degree improves anti-steel plate stress corrosion cracking (SSC) characteristic of steel plate, therefore the suitable model of Ca contents Enclose is 0.0015%~0.0040%.
Au×TRH≥1300：One of steel plate key core technology of the present invention；Added with slab by stabilization of austenite index Hot temperature is combined, and realizes following effect：
1. steel plate microscopic structure is single phase austenite tissue, ensure that steel plate has excellent non magnetic characteristic；
2. chromium carbide Cr in process of setting23C6, AlN be all dissolved, eliminate steel plate sensitization phenomenon, it is high to improve on-line solution Non magnetic steel plate stress corrosion dehiscence resistant (SSC) characteristic of manganese；
3. C, N atom of solid solution condition further stablize single austenite phase, the non magnetic characteristic of steel plate is improved；Wherein Au For stabilization of austenite index, Au=2.54+40.53 [(%C)+(%N)]+0.43 [(%Cu)+(%Ni)+(%Mn)]- 0.22 (%Al) -2.64 [(%P)+(%S)] -1.26 [(%Cr)+(%Mo)]-(%Si)；TRHFor slab heating temperature, unit For DEG C.
0.65≤[(%Cr)/(%Mn)] × (%C) × VC≤2.75：Be also steel plate key core technology of the present invention it One；Under the conditions of Gao Meng, high chrome contents, cooling velocity phase is accelerated with online by the Combination Design of alloying element Mn, Cr and C Match, realizes following effect：
1. steel plate obtains excellent non magnetic characteristic and stress corrosion dehiscence resistant (SSC) characteristic simultaneously, successfully solve Mutually restricting, it is difficult to the contradiction balanced between non magnetic and stress corrosion dehiscence resistant (SSC) characteristic of high manganese steel sheet；
2. solving the raising intensity of high manganese steel sheet and the mutual restriction of stress corrosion dehiscence resistant (SSC) characteristic, being difficult flat The contradiction of weighing apparatus eliminates and strengthens the problem of steel plate caused by austenitic steel is easily sensitized by improving C content；
3. played equipment potential (i.e. in cooling capacity allowable range), realize with water cash equivalent, with water for carbon, significantly Steel plate C and alloy content are reduced, the weldability of the non magnetic steel plate of high manganese is improved；Wherein VC is press quenching cooling velocity (accelerating cooling velocity), unit be DEG C/s.
Compositional data in relation above formula is calculated in terms of percentage, and if carbon content is 0.10%, when relational expression calculates, uses 0.10 brings calculating into.
The manufacturing method of the excellent non magnetic steel plate of high manganese of stress corrosion dehiscence resistant of the present invention comprising following step Suddenly：
1) it smelts
It smelted according to mentioned component, be cast into slab；
2) it heats
Using low-temperature heat, heating temperature is 1130 DEG C~1180 DEG C；
3) it rolls
First stage is common rolling, and milling train is with continual pattern, and the slab rolling that will continuously come out of the stove is at intermediate base；
Second stage is using recrystallization controlled rolling, 980 DEG C~1020 DEG C of intermediate base start rolling temperature, rolling pass reduction rate >=8%, add up reduction ratio >=50%, 940 DEG C~980 DEG C of finishing temperature；
4) cooling
After Controlled Cooling, steel plate is transported to immediately at the cooling equipment of acceleration, is quickly cooled down to steel plate, steel plate 930 DEG C~960 DEG C of cold temperature is opened, cold temperature≤400 DEG C, subsequent steel plate natural air cooling to room temperature are stopped in cooling velocity >=10 DEG C/s.
Preferably, in step 1), casting uses continuous casting process, is cast with vertical vertical casting machine, low overheat, in continuous casting Between the average degree of superheat Δ T controls of packet cast at 10 DEG C~25 DEG C, secondary cooling section uses weak cold, secondary cooling section specific water is≤ 0.60 liter/ton steel.
The microscopic structure of finished steel plate of the present invention is uniform fine austenite tissue, 6 grades of autstenitic grain size >=ASTM. Tensile strength >=800MPa of finished steel plate, the μ of magnetic permeability≤1.00, stress corrosion resistant maximum SCC crack depths are 0mm.
Slab low-temperature heat technology is used in steel of the present invention, with fining austenite grains size, but in view of ensuring chromium carbon Compound Cr23C6, AlN be dissolved completely, the two tradeoff consider after, slab heating temperature is set as between 1130 DEG C~1180 DEG C.
In rolling mill practice, the first stage is commonly to roll, and in the common operation of rolling, milling train is with continual pattern, continuously The slab rolling that will come out of the stove waits for temperature thickness to intermediate base, farthest fining austenite grains.Second stage is controlled using recrystallization System rolling, 980 DEG C~1020 DEG C of controlled rolling start rolling temperature, rolling pass reduction rate >=8% add up reduction ratio >=50%, finish to gauge temperature 940 DEG C~980 DEG C of degree prevents steel plate (i.e. press quenching before being quickly cooled down while ensureing that austenite passes through recrystallization softening Before) be sensitized, along crystal form chromium carbide Cr23C6It is precipitated, deteriorates high manganese steel sheet stress corrosion dehiscence resistant characteristic.
Beneficial effects of the present invention：
The present invention is combined using the Combination Design of the alloying elements such as Mn, Cr, C and N with press quenching (DQ), in less conjunction Under the conditions of golden additive amount, it is most important that do not add a large amount of noble element Ni, by press quenching technique, it is excellent to obtain steel plate While non magnetic characteristic and stress corrosion dehiscence resistant (SSC) characteristic, that is, successfully solve high manganese steel sheet it is non magnetic with it is anti- Mutually restricting, it is difficult to the contradiction balanced between stress corrosion cracking (SSC) characteristic；Secondly, the raising of high manganese steel sheet is solved Intensity restricts, with the mutual of stress corrosion dehiscence resistant (SSC) characteristic it is difficult to which the contradiction balanced, that is, eliminate by improving C content To strengthen the problem of steel plate caused by austenitic steel is easily sensitized；Again, played equipment potential (allows model in cooling capacity In enclosing), realize with water cash equivalent, with water for carbon, considerably reduce steel plate C and alloy content, improve the non magnetic steel plate of high manganese Weldability；Finally, out-line quenching is substituted by press quenching, considerably reduces manufacturing cost, shortens the manufacturing cycle, realizes Low cost manufacturing.The good weldability of steel plate saves the cost of user's steel member manufacture, shortens the manufacture of user's steel member Time, create huge value for user, thus such steel plate be not only high added value, green environmental protection product.
Description of the drawings
Fig. 1 is microscopic structure (1/4 thickness) photo of 5 steel of the embodiment of the present invention.
Specific implementation mode
The present invention will be further described with reference to the accompanying drawings and examples.
Table 1 is the ingredient of steel of the embodiment of the present invention.2~table of table 4 show steel making technique of the embodiment of the present invention.5 institute of table It is shown as the performance of steel of the embodiment of the present invention.
As seen from Figure 1, steel plate microscopic structure is uniform fine austenite grain structure, autstenitic grain size >=ASTM 6 grades, steel plate not only obtains high intensity, stress corrosion resistant characteristic (SCC crack depths be 0mm), but also with excellent non-magnetic Property (magnetic permeability≤1.00 μ), especially suitable for being electromagnetically shielded the manufacture of steel component.
High-strength nonmagnetic steel plate of the present invention is mainly used as manufacture electromagnetic shielding element of installation, is the great development of the national economy Critical material, at present major steel mill of the country be all made of SUS304 series austenitics stainless steel at present to substitute, it is not only of high cost It is high, and armor plate strength is relatively low, cannot manufacture large-scale carrying electromagnetic shielding element of installation；Domestic large size Heavy Machinery Plant, motor High-strength nonmagnetic steel plate needed for factory, transformer factory etc. need to can not ensure from Japan, German import, and delivery date, compel to use Family is before design drawing comes out, and order has certain size surplus steel plate in advance, after being come out so as to design drawing, according to design drawing The plate size that paper requires requires to cut steel plate, leads to the huge waste of material.
As Chinese national economy develops, the requirement of economizing type harmonious society, national basis engineering construction, energy work are built Cheng Jianshe (such as electrical equipment, high-voltage transmission equipment, Generator Set), a new generation of naval naval vessels electricity consumption magnetic shield apparatus and Large-Scale Equipment manufacturing development needed for building has swung to a day thing agenda, as national strategy basic material, high intensity of the present invention Non magnetic steel plate has a vast market foreground.

Claims (5)

1. the excellent non magnetic steel plate of high manganese of stress corrosion dehiscence resistant, composition by weight percent are：
C：0.05%~0.10%
Si：≤ 0.30%
Mn：14.00%~20.00%
P：≤ 0.013%
S：≤ 0.0050%
Cr：13.00%~17.00%
N：0.20%~0.45%
Al：0.015~0.045%
Ca：0.0015%~0.0040%,
Remaining is Fe and inevitable impurity；And above-mentioned constituent content must simultaneously meet following relationship：
Au×TRH≥1300：Wherein, Au is stabilization of austenite index, Au=2.54+40.53 [(%C)+(%N)]+0.43 [(%Cu)+(%Ni)+(%Mn)] -0.22 (%Al) -2.64 [(%P)+(%S)] -1.26 [(%Cr)+(%Mo)]-(% Si)；TRHFor slab heating temperature, unit is DEG C；
0.65≤[(%Cr)/(%Mn)] × (%C) × VC≤2.75；Wherein, VCAccelerate cooling for press quenching cooling velocity Speed, unit be DEG C/s；
The microscopic structure of finished steel plate is uniform fine austenite tissue, 6 grades of autstenitic grain size >=ASTM；Finished steel plate Tensile strength >=800MPa, the μ of magnetic permeability≤1.00, stress corrosion resistant SCC crack depths are 0mm；
In the fabrication process, it is 1130 DEG C~1180 DEG C that slab uses low-temperature heat, heating temperature to the non magnetic steel plate of high manganese； And after rolling, steel plate is transported to immediately at the cooling equipment of acceleration, is quickly cooled down to steel plate, steel plate open 930 DEG C of cold temperature~ 960 DEG C, cold temperature≤400 DEG C, subsequent steel plate natural air cooling to room temperature are stopped in cooling velocity >=10 DEG C/s.
2. the manufacturing method of the excellent non magnetic steel plate of high manganese of stress corrosion dehiscence resistant as described in claim 1, characterized in that Include the following steps：
1) it smelts
Ingredient described in accordance with the claim 1 is smelted, is cast into slab；
2) it heats
Using low-temperature heat, heating temperature is 1130 DEG C~1180 DEG C；
3) it rolls
First stage is common rolling, and milling train is with continual pattern, and the slab rolling that will continuously come out of the stove is at intermediate base；
Second stage, which uses, recrystallizes controlled rolling, 980 DEG C~1020 DEG C of intermediate base start rolling temperature, and rolling pass reduction rate >= 8%, add up reduction ratio >=50%, 940 DEG C~980 DEG C of finishing temperature；
4) cooling
After Controlled Cooling, steel plate is transported to immediately at the cooling equipment of acceleration, is quickly cooled down to steel plate, steel plate is opened cold Cold temperature≤400 DEG C, subsequent steel plate natural air cooling to room temperature are stopped in 930 DEG C~960 DEG C of temperature, cooling velocity >=10 DEG C/s.
3. the manufacturing method of the excellent non magnetic steel plate of high manganese of stress corrosion dehiscence resistant as claimed in claim 2, characterized in that In step 1), casting uses continuous casting process, is cast with vertical vertical casting machine, low overheat, and continuous casting production cast was averaged At 10 DEG C~25 DEG C, it is≤0.60 liter/ton steel that secondary cooling section, which uses weak cold, secondary cooling section specific water, for temperature Δ T controls.
4. the manufacturing method of the excellent non magnetic steel plate of high manganese of stress corrosion dehiscence resistant as claimed in claim 2, characterized in that The microscopic structure of finished steel plate is uniform fine austenite tissue, 6 grades of autstenitic grain size >=ASTM.
5. the manufacturing method of the excellent non magnetic steel plate of high manganese of stress corrosion dehiscence resistant as claimed in claim 2, characterized in that Tensile strength >=800MPA of finished steel plate, the μ of magnetic permeability≤1.00, stress corrosion resistant SCC crack depths are 0mm.
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CN107904513B (en) * 2017-11-30 2019-07-23 钢铁研究总院 A kind of non magnetic drill collar high-nitrogen austenitic stainless steel and its manufacturing method
KR102020507B1 (en) * 2017-12-20 2019-09-10 주식회사 포스코 Non-magnetic austenitic stainless steel improved in strength and surface conductivity
KR101977507B1 (en) * 2017-12-22 2019-05-10 주식회사 포스코 Steel sheet for magnetic field shielding and method for manufacturing the same

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU567769A1 (en) * 1976-04-19 1977-08-05 Предприятие П/Я А-7476 Steel
SU1266896A1 (en) * 1984-09-29 1986-10-30 Ленинградский технологический институт холодильной промышленности Steel
CN102365382A (en) * 2009-03-10 2012-02-29 麦克思普朗克铁研究院有限公司 Corrosion-resistant austenitic steel
CN104451406A (en) * 2014-11-18 2015-03-25 山东省源通机械股份有限公司 Highly saline-alkaline corrosion resistant stainless steel casting and preparation method thereof

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57164969A (en) * 1981-04-03 1982-10-09 Kobe Steel Ltd Nonmagnetic high mn-cr steel

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU567769A1 (en) * 1976-04-19 1977-08-05 Предприятие П/Я А-7476 Steel
SU1266896A1 (en) * 1984-09-29 1986-10-30 Ленинградский технологический институт холодильной промышленности Steel
CN102365382A (en) * 2009-03-10 2012-02-29 麦克思普朗克铁研究院有限公司 Corrosion-resistant austenitic steel
CN104451406A (en) * 2014-11-18 2015-03-25 山东省源通机械股份有限公司 Highly saline-alkaline corrosion resistant stainless steel casting and preparation method thereof

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