CN105950970A - Ultra-fine grain composite bainite high-strength and high-toughness steel for automobiles and preparation method thereof - Google Patents
Ultra-fine grain composite bainite high-strength and high-toughness steel for automobiles and preparation method thereof Download PDFInfo
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- CN105950970A CN105950970A CN201610302866.7A CN201610302866A CN105950970A CN 105950970 A CN105950970 A CN 105950970A CN 201610302866 A CN201610302866 A CN 201610302866A CN 105950970 A CN105950970 A CN 105950970A
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- 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
- C21D8/0247—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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- 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
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
- C21D2211/002—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
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- Mechanical Engineering (AREA)
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- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention discloses an ultra-fine grain composite bainite high-strength and high-toughness steel for automobiles and a preparation method thereof, and belongs to the technical field of machining of metal materials. The steel is obtained through continuous annealing heat treatment on a cold-roll steel sheet, and comprises the chemical components of, by weight percentage, 0-0.30% of C, 1.05-1.75% of Si, 1.25-2.45% of Mn, 0.15-0.25% of V, and the balance Fe and inevitable impurities. The average grain size is smaller than five micrometers, the structure of the steel is composed of lath-shaped and granular composite bainite, ferrite and retained austenite, the volume ratio of lath-shaped bainite to granular bainite is 0.8-1.0, the yield strength of the steel is 600 MPa, the strength of extension exceeds 1100 MPa, the total elongation rate exceeds 30%, the product of strength and elongation exceeds 30 GPa.%, the performance requirement of third-generation steel for automobiles is met, the good strength and elongation performance is achieved, the cost is low and the preparation process is simple.
Description
Technical field
The invention belongs to metal material processing technical field, relating to a kind of room temperature texture is lath-shaped and granular compound
Bainite, ferrite, retained austenite multiphase steel and there is the vanadium micro-alloying Ultra-fine Grained of high strength and ductility
Tissue automobile steel and manufacture method thereof.
Background technology
The development of auto industry the most all has important effect, previous generation to industrial economy or even national economy
Having recorded since six the seventies, the auto industry in North America, Japan and West Europe successively enters into the stage developed rapidly,
The technical concept development innovation of auto industry, and welcome the most steady to 21 century China Automobile Industry
The golden age of fixed development, breaks through 24,000,000 in pairs by Chinese automobile volume of production and marketing in 2015, has exceeded complete
More than the 1/4 of ball volume of production and marketing, the whole world first is sure to occupy in automobile production and marketing.In the face of the development of current automotive industry,
Automobile becomes increasingly conspicuous in the problem of energy consumption, environmental protection and security fields, and automotive light weight technology becomes the new of industry development
Direction, exploitation high intensity, high-ductility, low-density, highly anti-fatigue new automobile steel are automobile lightweights
Feasible way.By improving the strength and ductility product of automobile steel, the consumption of material can not only be reduced to reduce
The purpose of complete vehicle weight, also ensures that bus body strength and security performance simultaneously, and exploitation application potential is huge.
Owing in low-alloy high-strength automobile steel, the addition of alloying element is relatively fewer, want to improve material
Strength and ductility product performance, need to reasonably design with structural state its preparation technology and control, it is thus achieved that certain proportioning
The superfine grained structure steel of ferrite, bainite, martensite and retained austenite two-phase or multiphase coexistence,
Guarantee that material has the good combination property of high intensity, high-ductility, high tenacity, low-density, highly anti-fatigue.In
State patent application CN201110280804.8 describes the preparation of a kind of above Cold-Rolled TRIP Steel of 1000MPa level
Method, has carried out the compound interpolation of Nb, V, has additionally added 0.8～1.0wt% during the design of this material composition
Al, higher Al can hinder complete austenitizing that Ms point also can be made to raise, its two-phase section temperature and bayesian
The operable interval of temperature, body district is less, and the room temperature texture of material is ferrite, bainite and retained austenite, stretches
Long rate is more than 18%, and combination property is less than the compound bainite high-strength annealed steel in the present invention.Chinese patent application
CN201210411320.7 describes the preparation method of a kind of high strength and ductility TRIP steel plate, and this Material cladding adds
Nb, V, Ti, Cr, Mo microalloy element, is obtained one by cold-reduced sheet after bell-type annealing furnace annealing and has
Martensite, austenite and a small amount of ferritic structure steel, its strength and ductility product performance has exceeded 30GPa %, but
Said material alloy system is complicated and increases smelting difficulty, and annealing temperature retention time is longer in addition reduces production effect
Rate also increases energy resource consumption.Chinese patent application CN200910046581.1 describes a kind of Ultra-fine Grained bayesian
The manufacture method of body high-strength steel, with the addition of Cr, Nb, Ti, Zr microalloy element, passes through TMCP in this material
Technique processed and accelerated cooling process obtain a kind of ultrafine crystal bainite organization steel, and the tensile strength of material exists
About 800MPa, elongation percentage is less than 20%, and combination property is less than the compound bainite high-strength annealed steel in the present invention.
In sum, the compound bainite high-strength annealed steel in the present invention by adjust heat treatment process technological parameter,
After two-phase section annealing with Bainite Region isothermal heat treatment process, at room temperature to have lath-shaped multiple with granular for material
Close bainite, ferrite, the heterogeneous structure structure of retained austenite.Result shows when tissue each in material is shared
Volume fraction when certain scope, especially exist when the ratio of ferrite bainite with the volume of granular bainite
The proportion of 0.8～1.0, the strength and ductility product of material will be significantly improved, and tissue distribution is uniform and brilliant simultaneously
Particle size is tiny, and material average grain size is less than 5 μm.Mutually coordinated between each tissue in deformation process join
Closing, compound bainite structure can improve the obdurability of material, and metastable retained austenite undergoes phase transition induced plastic
Effect so that material can bear bigger load and deformation, has good plasticity and shock resistance, its
Yield strength Rp>=600MPa, tensile strength Rm>=1100MPa, elongation after fracture A >=30%, strength and ductility product
>=30GPa %.Owing to the alloying component content of this compound bainite high-strength steel is low, foreign country can be made full use of
Abundant vanadium resource advantage, its process for producing is simple simultaneously, and excellent combination property, is new automobile
With the ideal material of steel.
Summary of the invention
For the requirement to the strength of materials Yu plasticity of the new automobile steel, the present invention provides a kind of Ultra-fine Grained to be combined shellfish
Family name's height is tough automobile steel and preparation method thereof, material has ultra-fine uniform grain structure, lath-shaped and grain
Shape is combined mutually coordinated cooperation between bainite, ferrite, residual austenite soma, has good forming property,
Its strength and ductility product has reached the performance requirement of third generation automobile steel.
The technical scheme is that a kind of Ultra-fine Grained is combined the tough automobile steel of bainite high-strength, its chemical composition
Percentage by weight is: C :≤0.30%, Si:1.05～1.75%, Mn:1.25～2.45%, V:0.15～0.25%,
Surplus is Fe and inevitable impurity.
The another object of this law invention is to provide Ultra-fine Grained and is combined the preparation method of the tough automobile steel of bainite high-strength,
Specifically include following steps:
Step 1: weigh raw material according to design composition, carries out smelting, continuous casting, obtains hot rolled plate, by hot rolled plate
After pickling cold rolling, cold rolling reduction ratio is 45%～65%, and obtaining thickness is 1.5～2.0mm flat cold-rolled sheets；
Step 2: step 1 prepares flat cold-rolled sheet, and to be warming up to austenite, ferrite with 5～25 DEG C/s biphase
District 780～880 DEG C of temperature, insulation 2～3min, standby；
Step 3: after step 2 is processed: steel plate being cooled to bainite transformation temperature district with 30-60 DEG C/s
350～430 DEG C of temperature in territory, are incubated 6～7min；
Step 4: the steel plate after step 3 being processed is cooled to room temperature with the cooling rate of 20-40 DEG C/s, is i.e. surpassed
The thin brilliant compound tough automobile steel of bainite high-strength.
Further, what described Ultra-fine Grained was combined the tough automobile steel of bainite high-strength is organized as ferrite bainite+granular
Bainite+ferrite+retained austenite, the volume ratio of each tissue is: ferrite bainite 20%～30%, grain
Shape bainite 20%～30%, ferrite 30%～50%, retained austenite 10%～18%；Described Ultra-fine Grained is multiple
Close the average grain size of the tough automobile steel of bainite high-strength less than 5 μm.
Further, the ratio of described ferrite bainite volume shared with granular bainite two kinds tissue is 0.8～1.0.
Further, described Ultra-fine Grained is combined bainite high-strength its yield strength R of tough automobile steelp>=600MPa,
Tensile strength Rm>=1100MPa, elongation after fracture A >=30%, strength and ductility product >=30GPa %.
The acting as of essential element in material of the present invention:
C is the important element of austenitic formation, is also the essential element of stable austenite, and austenite is to bayesian
Body transition process occurs the diffusion of C element simultaneously, in retained austenite C element enrichment so that its
Under room temperature can stable existence, the increase of C content can also improve the intensity of material.
Si can suppress the precipitation of the carbides such as cementite, reduces the C of solid solution in ferrite, improves in austenite
C content, thus ensure at room temperature to obtain enough stable residual austenites.
The Main Function of Mn is to strengthen stabilization of austenite, extends it and changes stage of incubation, makes ferrite and bayesian
Body transformation is easily controlled, and also promotes Ms to reduce simultaneously, forms the retained austenite of the rich carbon of certain volume.
V during heating and thermal insulation can inhibiting grain growth, improve grain coarsening temperature, thus necessarily
Crystal grain thinning tissue in degree；In addition V or strong carbide constitution element, it is mainly solid with trace in steel
It is dissolved in ferrite or forms the existence of vanadium carbide nitride the second phase both forms, playing the effect of precipitation strength.
The present invention through roll forming and Technology for Heating Processing, prepares one by rational element proportioning
There is the high tough automobile steel of heterogeneous structure of superfine grained structure, ferrite bainite and the volume of granular bainite
Ratio control between 0.8～1.0, it is ensured that material has a higher obdurability, metastable retained austenite induction phase
Change effect can also improve the plasticity of material further, and the precipitated phase that V becomes with C-shaped can also produce precipitation strength effect
Should, add refined crystalline strengthening effect and can improve the combination property of material to varying degrees.
Accompanying drawing explanation
Fig. 1 is the scanning tissue image of the high-strength steel in the embodiment of the present invention 1.
Fig. 2 is the scanning tissue image of the high-strength steel in the embodiment of the present invention 1.
Fig. 3 is the scanning tissue image of the high-strength steel in the embodiment of the present invention 1.
Fig. 4 is the transmission electron microscope organization charts picture of the high-strength steel in the embodiment of the present invention.
Fig. 5 is the XRD testing result image of the high-strength steel in the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with specific embodiment, technical scheme is described further.
Embodiment 1:
Be first according to mentioned component scope carry out smelting, continuous casting, then detect the composition of strand, be shown in Table 1.
The composition (wt.%) of table 1 strand
Concrete heat treatment process parameter is shown in Table 2.
Table 2 heat treatment process parameter
The mechanical property of high-strength automobile steel prepared according to Tables 1 and 2 is shown in Table 3.
Table 3 mechanical property
The high-strength automobile steel prepared according to Tables 1 and 2 records paralympic volume fraction by XRD, with
Time calculate other each phase volume fractions, result is shown in Fig. 5 and Biao 4.
Table 4 different tissues content
Each mechanical property all reaches required performance indications as can be seen from Table 3, and yield strength is
692MPa, tensile strength is 1116MPa, and percentage elongation is 31%, strength and ductility product 34.6GPa %.Scanned photograph
As it is shown in figure 1, transmission photo is as shown in Figure 4, it is organized as ferrite bainite+granular bainite+ferrite+residual
Remaining austenite, lath-shaped and granular bainite difference of the total volume 21% and 25%, the ratio of both volumes is
0.84, ferrite volume fraction is 40%, and retained austenite volume fraction is 14%, mainly with block distribution in
Ferrite grain boundaries or be distributed between lath of bainite with film like.
Embodiment 2:
Be first according to mentioned component scope carry out smelting, continuous casting, then detect the composition of strand, be shown in Table 5.
The composition (wt.%) of table 5 strand
Concrete heat treatment process parameter is shown in Table 6.
Table 6 heat treatment process parameter
The mechanical property of the high strength and ductility automobile steel prepared according to table 5 and table 6 is shown in Table 7.
Table 7 mechanical property
The high-strength automobile steel prepared according to table 5 and table 6 records paralympic volume fraction by XRD, counts simultaneously
Calculating other each phase volume fractions, result is shown in Fig. 5 and Biao 4.
Table 8 different tissues content
Each mechanical property all reaches required performance indications as can be seen from Table 7, and yield strength is
669MPa, tensile strength is 1136MPa, and percentage elongation is 30%, strength and ductility product 34.1GPa %.Scanned photograph
As in figure 2 it is shown, transmission photo is as shown in Figure 4, it is organized as ferrite bainite+granular bainite+ferrite+residual
Remaining austenite, lath-shaped and granular bainite difference of the total volume 24% and 26%, the ratio of both volumes
Being 0.92, ferrite volume fraction is 35%, and retained austenite volume fraction is 15%, mainly divides with bulk
It is distributed in ferrite grain boundaries or is distributed between lath of bainite with film like.
Embodiment 3:
Be first according to mentioned component scope carry out smelting, continuous casting, then detect the composition of strand, be shown in Table 9.
The composition (wt.%) of table 9 strand
Concrete heat treatment process parameter is shown in Table 10.
Table 10 heat treatment process parameter
It is shown in Table 11 according to the mechanical property of table 9 and the prepared high strength and ductility automobile steel of table 10.
Table 11 mechanical property
The high-strength automobile steel prepared according to table 9 and table 10 records paralympic volume fraction by XRD,
Calculating other each phase volume fractions, result is shown in Fig. 5 and Biao 4 simultaneously.
Table 12 different tissues content
Each mechanical property all reaches required performance indications as can be seen from Table 11, and yield strength is
654MPa, tensile strength is 1163MPa, and percentage elongation is 30%, strength and ductility product 34.9GPa %.Scanned photograph
As it is shown on figure 3, transmission photo is as shown in Figure 4, it is organized as ferrite bainite+granular bainite+ferrite+residual
Remaining austenite, lath-shaped and granular bainite difference of the total volume 21% and 26%, the ratio of both volumes
Being 0.81, ferrite volume fraction is 38%, and retained austenite volume fraction is 15%, mainly divides with bulk
It is distributed in ferrite grain boundaries or is distributed between lath of bainite with film like.
The sample prepared according to composition and the technological parameter of above-described embodiment, each mechanical property all reaches required
Performance indications, yield strength > 600MPa, tensile strength > 1100MPa, elongation after fracture A >=30%, by force
Mould long-pending >=30GPa %.Transmission electron microscope photo as shown in Figure 4, by lath-shaped and granular compound bainite, ferrum element
Body, retained austenite composition, the ratio of volume shared by ferrite bainite and granular bainite is 0.8～1.0, tissue
Crystal grain is the most tiny, and average grain size is less than 5 μm.Retained austenite is mainly brilliant in ferrite with block distribution
Boundary or be distributed in lath of bainite interface with film like, undergoes phase transition induced plastic effect when deformation and makes material
Deformability improve, the bainite structure of complex morphological can also improve the toughness and tenacity of material, and material has
Excellent comprehensive mechanical property, strength and ductility product meets the requirement of third generation automobile steel.
It should be noted last that, above example is only in order to illustrate technical scheme and unrestricted.To the greatest extent
The present invention has been described in detail by pipe with reference to embodiment, it will be apparent to an ordinarily skilled person in the art that this
The technical scheme of invention is modified or equivalent, without departure from spirit and the model of technical solution of the present invention
Enclosing, it all should be contained in the middle of scope of the presently claimed invention.
Claims (8)
1. a Ultra-fine Grained is combined the tough automobile steel of bainite high-strength, it is characterized in that, the chemical component weight percentage ratio of this automobile steel is: C :≤0.30%, Si:1.05 ~ 1.75%, Mn:1.25 ~ 2.45%, V:0.15 ~ 0.25%, surplus are Fe and inevitable impurity.
2. a Ultra-fine Grained is combined the tough automobile steel of bainite high-strength, it is characterised in that the chemical component weight percentage ratio of this automobile steel is: C:0.20%, Si:1.54%, Mn:2.05%, V:0.21%, surplus are Fe and inevitable impurity.
3. a Ultra-fine Grained is combined the tough automobile steel of bainite high-strength, it is characterised in that the chemical component weight percentage ratio of this automobile steel is: C:0.21%, Si:1.05%, Mn:1.95%, V:0.22%, surplus are Fe and inevitable impurity.
4. a Ultra-fine Grained is combined the tough automobile steel of bainite high-strength, it is characterised in that the chemical component weight percentage ratio of this automobile steel is: C:0.19%, Si:1.34%, Mn:2.05%, V:0.18%, surplus are Fe and inevitable impurity.
5. the method for the tough automobile steel of the height prepared as described in claim 1-4 any one, it is characterised in that comprise the following steps:
Step 1: weigh raw material according to design composition, carries out smelting, continuous casting, obtains hot rolled plate, by hot rolled plate after pickling cold rolling, cold rolling reduction ratio is 45%～65%, and obtaining thickness is 1.5～2.0 mm flat cold-rolled sheets；
Step 2: step 1 prepares flat cold-rolled sheet and is warming up to austenite, 780 ~ 880 DEG C of temperature of ferrite two-phase section with 5 ~ 25 DEG C/s, is incubated 2 ~ 3min, standby；
Step 3: after step 2 is processed: steel plate, with 350 ~ 430 DEG C of temperature to bainite transformation temperature region that are cooled to of 30-60 DEG C/s, is incubated 6 ~ 7min；
Step 4: the steel plate after step 3 being processed is cooled to room temperature with the cooling rate of 20-40 DEG C/s, i.e. obtains Ultra-fine Grained and is combined the tough automobile steel of bainite high-strength.
Preparation method the most according to claim 5, it is characterized in that, the volume ratio of each tissue that described Ultra-fine Grained is combined the tough automobile steel of bainite high-strength is: ferrite bainite 20% ~ 30%, granular bainite 20% ~ 30%, ferrite 30% ~ 50%, retained austenite 10% ~ 18%；Described Ultra-fine Grained is combined the average grain size of the tough automobile steel of bainite high-strength less than 5 μm.
Material room temperature texture the most according to claim 6, it is characterised in that the ratio of ferrite bainite volume shared with granular bainite two kinds tissue is 0.8 ~ 1.0.
Ultra-fine Grained the most according to claim 5 is combined bainite high-strength Multiphase Steel and preparation method thereof, it is characterised in that yield strength R of materialp>=600MPa, tensile strength Rm>=1100MPa, elongation after fracture A >=30%, strength and ductility product >=30GPa %.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108048734A (en) * | 2017-11-16 | 2018-05-18 | 首钢集团有限公司 | A kind of tensile strength 700MPa grades of hot rolling Multiphase Steels and its production method |
| CN108396259A (en) * | 2017-02-05 | 2018-08-14 | 鞍钢股份有限公司 | Hot-rolled galvanized steel sheet with high hole expansion performance and manufacturing method thereof |
| CN109943769A (en) * | 2017-12-20 | 2019-06-28 | 宝山钢铁股份有限公司 | 780MPa rank low-carbon and low-alloy TRIP steel and its quick heat treatment method |
| CN112647011A (en) * | 2020-12-19 | 2021-04-13 | 台州学院 | Preparation method of fine-grain high-strength and high-toughness bainitic steel |
| CN115786665A (en) * | 2022-11-04 | 2023-03-14 | 中铁宝桥集团有限公司 | Method for stabilizing structure and performance of superfine bainite rail steel and rail steel |
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| EP1749895A1 (en) * | 2005-08-04 | 2007-02-07 | ARCELOR France | Manufacture of steel sheets having high resistance and excellent ductility, products thereof |
| CN102952996A (en) * | 2013-01-04 | 2013-03-06 | 鞍钢股份有限公司 | High-elongation cold-rolled TRIP steel plate and preparation method thereof |
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| EP1749895A1 (en) * | 2005-08-04 | 2007-02-07 | ARCELOR France | Manufacture of steel sheets having high resistance and excellent ductility, products thereof |
| CN102952996A (en) * | 2013-01-04 | 2013-03-06 | 鞍钢股份有限公司 | High-elongation cold-rolled TRIP steel plate and preparation method thereof |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108396259A (en) * | 2017-02-05 | 2018-08-14 | 鞍钢股份有限公司 | Hot-rolled galvanized steel sheet with high hole expansion performance and manufacturing method thereof |
| CN108048734A (en) * | 2017-11-16 | 2018-05-18 | 首钢集团有限公司 | A kind of tensile strength 700MPa grades of hot rolling Multiphase Steels and its production method |
| CN109943769A (en) * | 2017-12-20 | 2019-06-28 | 宝山钢铁股份有限公司 | 780MPa rank low-carbon and low-alloy TRIP steel and its quick heat treatment method |
| CN109943769B (en) * | 2017-12-20 | 2021-06-15 | 宝山钢铁股份有限公司 | 780 MPa-grade low-carbon low-alloy TRIP steel and rapid heat treatment method thereof |
| CN112647011A (en) * | 2020-12-19 | 2021-04-13 | 台州学院 | Preparation method of fine-grain high-strength and high-toughness bainitic steel |
| CN115786665A (en) * | 2022-11-04 | 2023-03-14 | 中铁宝桥集团有限公司 | Method for stabilizing structure and performance of superfine bainite rail steel and rail steel |
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| CN105950970B (en) | 2018-01-02 |
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