CN109576569A - A kind of torsion beam of automobile steel and preparation method thereof - Google Patents
A kind of torsion beam of automobile steel and preparation method thereof Download PDFInfo
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- CN109576569A CN109576569A CN201810803465.9A CN201810803465A CN109576569A CN 109576569 A CN109576569 A CN 109576569A CN 201810803465 A CN201810803465 A CN 201810803465A CN 109576569 A CN109576569 A CN 109576569A
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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
-
- 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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- 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
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
-
- 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
-
- 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
- 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
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- 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
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- 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
- C21D2211/009—Pearlite
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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 Sheet Steel (AREA)
Abstract
The present invention improves a kind of torsion beam of automobile steel and preparation method thereof, ingredient of the torsion beam of automobile with steel comprising following mass percentage: C:0.03~0.22%, Si:0.1~0.4%, Mn:0.8~2.0%, P≤0.02%, S≤0.009%, Nb≤0.10%, Cr≤0.50%, Mo≤0.50%, Re:0.002-0.05%, Al≤0.05%, remaining is Fe and inevitable impurity.The present invention designs and selects corresponding preparation method by the said ratio of ingredient, and the parameter in method is adjusted, the high weldability torsion beam of automobile steel that bending and forming is had excellent performance are obtained, after the forming of its welding processing, part plate surface layer is high rigidity area, is soft area at center portion, and hardness difference between surface and core can be still being maintained after annealing heat-treatment, thus comprehensive mechanical performance with higher, can play excellent fatigue behaviour.
Description
Technical field
The invention belongs to iron and steel smelting technology fields more particularly to a kind of torsion beam of automobile steel and preparation method thereof.
Background technique
On rough ground when driving, torsion beam is subjected in the longitudinal force and vertical direction of wheel transmitting automobile simultaneously
Alternating load, stress is high at crossbeam, is also easy to produce fatigue.Therefore necessarily require torsion beam while having high-intensitive, also
Need high-fatigue strength.
But during the manufacturing of torsion beam, needs to carry out the steel pipe after welding largely cold plasticity and become
Shape, therefore biggish residual stress can be generated in deformed region, partial region residual stress even can with being superimposed for external load
Material can be made to generate plastic deformation and it is made to lose bearing capacity, part can also be eliminated beneficial to remaining simultaneously by carrying out stress relief annealing
Stress reduces steel softening by fatigue properties.
Summary of the invention
In order to solve drawbacks described above in the prior art, the main purpose of the present invention is to provide a kind of torsion beam of automobile use
Steel and preparation method thereof do not reduce fatigue strength in preparation method, have obtained bending and forming and have had excellent performance and have high weldering
The torsion beam of automobile steel of connecing property.
In order to achieve the above object, the present invention adopts the following technical scheme: a kind of torsion beam of automobile steel, include following
The ingredient of mass percentage: C:0.03~0.22%, Si:0.1~0.4%, Mn:0.8~2.0%, P≤0.02%, S≤
0.009%, Nb≤0.10%, Cr≤0.50%, Mo≤0.50%, Al≤0.05%, remaining is Fe and inevitable impurity.
As a further preference, further include content be 0.002~0.05% Re.
As a further preference, the Re content are as follows: 0.01-0.02%.
As a further preference, the C content are as follows: 0.06~0.11%.
As a further preference, the Si content are as follows: 0.12~0.14%.
As a further preference, the Mn content are as follows: 1.46-1.50%.
As a further preference, the microscopic metallographic structure of torsion beam of automobile steel is ferrite+pearlite.
Another object of the present invention is to provide the preparation methods of above-mentioned torsion beam of automobile steel, include the following steps:
After molten iron is pre-processed, continuous casting is obtained after converter smelting, LF refining, RH refining obtain the molten steel of mentioned component
Slab；After the slab is heated, hot rolled plate is obtained by roughing, finish rolling, the roughing final temperature control is 1020
~1120 DEG C, finish rolling final temperature control is 830~900 DEG C, by after the hot rolled plate section cooling at 530~620 DEG C
Acquisition hot-strip is batched under coiling temperature；The hot rolled coil is obtained into finished product after flattened, pickling.
As a further preference, the hot rolled plate thickness specification variation range control is in 1.8~5mm.
As a further preference, the tapping temperature of the slab is 1230-1245 DEG C, the roughing final temperature control
It is 1040~1050 DEG C, the finish rolling final temperature control is 850-875 DEG C；The coiling temperature is 550-575 DEG C.
The beneficial effects of the present invention are: torsion beam of automobile steel of the present invention, the ingredient comprising following mass percentage:
C:0.03~0.22%, Si:0.1~0.4%, Mn:0.8~2.0%, P≤0.02%, S≤0.009%, Nb≤0.10%, Cr
≤ 0.50%, Mo≤0.50%, remaining is Fe and inevitable impurity.The said ratio design and choosing that the present invention passes through ingredient
With corresponding preparation method, and the parameter in method is adjusted, has obtained the high weldability vapour that bending and forming is had excellent performance
Vehicle torsion beam steel, it is soft area at center portion that after the forming of its welding processing, part plate surface layer, which is high rigidity area, and
Hardness difference between surface and core, thus comprehensive mechanical performance with higher can be still maintained after annealing heat-treatment, can be played excellent
Fatigue behaviour.
Detailed description of the invention
Fig. 1 is the microscopic structure schematic diagram of the torsion beam of automobile steel of preparation of the embodiment of the present invention.
Fig. 2 a is that the sample before S2 of embodiment of the present invention heat treatment carries out transmission electron microscope extraction replica schematic diagram.
Fig. 2 b is that the sample after S2 of embodiment of the present invention heat treatment carries out transmission electron microscope extraction replica schematic diagram.
Specific embodiment
The present invention avoids the production of existing torsion beam by providing a kind of torsion beam of automobile steel and preparation method thereof
In manufacturing process, reduce steel softening by the defect of fatigue properties.
In order to solve drawbacks described above, the main thought of the embodiment of the present invention is:
Torsion beam of automobile steel of the embodiment of the present invention, the ingredient comprising following mass percentage: C:0.03~
0.22%, Si:0.1~0.4%, Mn:0.8~2.0%, P≤0.02%, S≤0.009%, Nb≤0.10%, Cr≤
0.50%, Mo≤0.50%, Al≤0.05%, remaining is Fe and inevitable impurity.
C content of the invention is 0.03~0.22%, and carbon and alloy element Nb and Mo etc. form microalloy carbide and rises
To the effect of precipitation strength, higher carbon content, which has weldability, to be adversely affected, thus selects low-carbon system.
Si content 0.1~0.4% of the invention takes lower silicone content, the influence of silicon properties of weld when reducing welding.
Mn content of the invention is 0.8~2.0%, and the Mn of 0.8% or more addition improves matrix strength, and too high levels can shadow
It rings material weldability and increases temper brittleness tendency.
P and S of the invention has an adverse effect to material property, should use up P and S content in strict control steel.
Al is used as deoxidier in the present invention, is existed mostly in the form of field trash in steel clock and is endangered material property, therefore
It is required that Al content is lower in material, Al is lower than 0.05%.
A small amount of Nb can give full play to refined crystalline strengthening and precipitating reinforcing effect in the present invention, increase in drawing process
The temper resistance of material.Nb belongs to noble metal, and content is no more than 0.1%.
Cr content of the invention is lower than 0.50%, and appropriate Cr is added and improves matrix strength, in annealing process supplement be precipitated from
And inhibit annealing softening.
Mo content of the invention can supplement precipitation lower than 0.50%, Mo in annealing process, reduce and analyse in annealing process
Phase size out improves material temper resistance, material can be made to anneal at relatively high temperatures, sufficiently elimination residual stress.
The embodiment of the present invention adds rare earth element Re in mentioned component system to optimize steel inclusion shape and size,
Impurity element is reduced in the segregation of crystal boundary.Spherical rare-earth sulfide still keeps tiny spherical shape or spindle, relatively evenly
It is distributed in steel, eliminates the ribbon MnS along steel rolling directional spreding, while rare earth element is enriched in crystal boundary, reduce
Impurity element, to strengthen crystal boundary, has both inhibition and postpones austenite recrystallization, improve the length of austenite grain in the segregation of crystal boundary
Big temperature, so that crystal grain is refined, to improve Fracture of Material.The addition of rare earth element reduces the solid solution temperature of carbonitride
Degree, promotes the solid solution of the second phase particles such as (Nb, Mo, Cr) C, can more promote in thermal deformation process the analysis of (Nb, Mo, Cr) C
Out, to improve the precipitating reinforcing effect of the alloying elements such as niobium and molybdenum.The collective effect of the above influence factor makes implementation of the present invention
Example steel have excellent bending and forming and weldability, while improving the fatigue properties of formation of parts.
In addition, the present invention selects preparation method corresponding with mentioned component system, and the parameter in method is adjusted,
The preparation method of torsion beam of automobile steel of the embodiment of the present invention, includes the following steps:
After molten iron is pre-processed, continuous casting is obtained after converter smelting, LF refining, RH refining obtain the molten steel of mentioned component
Slab；After the slab is heated, hot rolled plate, the hot rolled plate thickness specification variation range are obtained by roughing, finish rolling
In 1.8~5mm, the roughing final temperature control is 1020~1120 DEG C for control, the finish rolling final temperature control for 830~
900 DEG C, acquisition hot-strip will be batched under 530~620 DEG C of coiling temperatures after the hot rolled plate section cooling；By the hot rolling
Finished product is obtained after rolling up flattened, pickling.
To dissolve microalloy precipitated phase in slab sufficiently, it is ensured that homogenization of composition, and uniform austenite structure is obtained,
The heating temperature of slab is set in 1230-1245 DEG C or so.The low temperature finish to gauge in austenite Unhydrated cement temperature range, and
Avoid austenite ferrite two-phase section roll, rolling temperature control make at 830~900 DEG C the abundant cumulative deformation of austenite with
Improve ferrite nucleation rate.Coiling temperature is controlled at 530~620 DEG C to obtain a large amount of tiny microalloy precipitated phase particle to reach
To the purpose of matrix precipitation strength.The plate microscopic metallographic structure finally obtained be ferrite+pearlite so that product have it is good
Good buckling performance.
The embodiment of the present invention uses C-Si-Mn-Nb-Mo-Cr component system, by controlled rolling, section cooling, and cooperates
Certain smooth, acid cleaning process, tensile strength 700MPa grades of bending and forming of acquisition is excellent and has the hot rolling of high welding performance
Pickled steel strip makes tiny second phase being precipitated performance precipitation strength effect make up residual stress and disappears by suitable heat treatment process
It removes and bring strength reduction.
Steel of the embodiment of the present invention can occur to add by Bending Processing forming after torsion beam is made in part some regions
Work hardening, generates very big residual stress, therefore cause the increase of piece surface hardness, and center portion deforms the increase of smaller hardness
Very little, there are certain difference of hardness between the table heart, and it is soft to show as table hard-core.But with shape associated residual stress at certain
The fatigue properties of material can be reduced in kind degree, therefore annealing heat-treatment is carried out to the torsion beam of steel of the present invention production, passed through
Above-mentioned reasonable thermal treatment producing method is formulated to eliminate the residual stress of generation, improves fatigue strength.It is eliminated in annealing heat-treatment
While residual stress, by the way that tiny microalloy carbide such as (Nb, Mo, Cr) C is precipitated in dislocation and in tissue matrix,
The disappearance of residual stress can effectively be alleviated and bring surface hardness and strength reduction, to effectively maintain at annealing heat
The difference of hardness of thickness of steel product direction upper epidermis and center portion as caused by bending and forming after reason.
After the standby torsion beam of automobile of steel of the embodiment of the present invention carries out bending and forming with steel, Vickers hardness at plate thickness center
Differ at 20~40 points with away from the Vickers hardness peak within plate surface 0.4mm.And it is being defined by λ=T (20+log (t))
Tempering parameter λ be 15000~17000 under the conditions of be heat-treated after plate thickness center Vickers hardness with away from the dimension within the 0.4mm of surface
Family name's hardness peak differs 30~70 points (T is absolute temperature, and t is that chronomere is hour).
In order to which above and other purpose, feature and the advantage of the present invention can be clearer and more comprehensible, several implementations are cited below particularly
Example, to illustrate torsion beam of automobile steel and preparation method thereof of the present invention.
The preparation method of torsion beam of automobile steel of the embodiment of the present invention, comprising the following steps:
After molten iron is pre-processed, the continuous casting acquisition slab after converter smelting, LF refining, RH refining obtain molten steel；Molten steel
Middle practical chemical component is as shown in table 1.
1 chemical component of table (wt%)
After the slab is heated, the tapping temperature of the slab is 1230-1245 DEG C, is obtained by roughing, finish rolling
Hot rolled plate is obtained, in 1.8~5mm, the roughing final temperature control is 1020 for the hot rolled plate thickness specification variation range control
~1120 DEG C, finish rolling final temperature control is 830~900 DEG C, by after the hot rolled plate section cooling at 530~620 DEG C
Acquisition hot-strip is batched under coiling temperature；The hot rolled coil is obtained into finished product after flattened, pickling.Each embodiment technological parameter
Specifically it is shown in Table 2；
Table 2
Fig. 1 is the microscopic structure schematic diagram of torsion beam of automobile steel prepared by the embodiment of the present invention 3.Wherein, plate is micro-
See tissue are as follows:+35% pearlite of ferrite (volume fraction), it is good by matrix ferrite+pearlite guarantees that product has
Good buckling performance.
In order to prove the performance of torsion beam of automobile steel that the embodiment of the present invention is prepared, following tests are carried out:
(1) is by 4 kinds of obtained test steel pipes of above-described embodiment S1-S4 and according to the production journey of torsion beam tubular cross bearer
Sequence punch forming samples in deformation area, carries out hardness test with microhardness testers (load HV0.1), measurement deformation region is thick
On degree direction central center portion with away from (taking the hardness difference away from surface 0.3mm) at the fixed range of surface.Sample is subjected to 3 technique of table
Heat treatment after carry out hardness measurement test again, record data in table 3.
Table 3
| Number | Annealing temperature DEG C | Soaking time h | Hardness difference |
| S1-1 | 520 | 1.5 | 43 |
| S1-2 | - | - | 50 |
| S2-1 | 480 | 2 | 50 |
| S2-2 | - | - | 41 |
| S3-1 | 520 | 1 | 47 |
| S3-2 | - | - | 46 |
| S4-1 | 560 | 0.5 | 38 |
| S4-2 | - | - | 40 |
Test specimen surface layer deformation area due to residual stress presence, thus cause surface hardness value increase.It is being moved back
After burning hot processing, residual stress disappears, and microalloy carbonitride supplement is precipitated, make up residual stress disappear and caused by surface layer it is hard
Degree reduces.
(2) the sample progress transmission electron microscope extraction replica observation deformation area precipitated phase shape for S2 heat treatment front and back will be numbered
The variation of state and distribution.As illustrated in figures 2 a-2b, there are a large amount of tiny precipitated phases after heat treatment, in matrix, to demonstrate heat
After processing tiny microalloy Carbonitride Precipitation mutually make up residual stress disappear and caused by surface hardness reduce.Pass through annealing heat
The residual stress of part and its intensity is improved after processing Material removal with precipitation strength mechanism.
Technical solution in above-mentioned the embodiment of the present application, at least have the following technical effects or advantages:
Torsion beam of automobile steel of the embodiment of the present invention, the ingredient comprising following mass percentage: C:0.03~
0.22%, Si:0.1~0.4%, Mn:0.8~2.0%, P≤0.02%, S≤0.009%, Nb≤0.10%, Cr≤
0.50%, Mo≤0.50%, Re:0.002-0.05%, Al≤0.05%, remaining is Fe and inevitable impurity.The present invention is logical
It crosses the said ratio design of ingredient and selects corresponding preparation method, and the parameter in method is adjusted, rolled over
The high weldability torsion beam of automobile steel that o ing is had excellent performance, after the forming of its welding processing, part plate surface layer is high hard
Area is spent, is soft area at center portion, and can still maintain hardness difference between surface and core after annealing heat-treatment, thus it is with higher comprehensive
Mechanical performance is closed, excellent fatigue behaviour can be played.
Above-described specific embodiment has carried out further the purpose of the present invention, technical scheme and beneficial effects
It is described in detail, it should be understood that being not limited to this hair the foregoing is merely a specific embodiment of the invention
Bright, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should be included in the present invention
Protection scope within.
Claims (10)
1. a kind of torsion beam of automobile steel, it is characterised in that: the ingredient comprising following mass percentage: C:0.03~
0.22%, Si:0.1~0.4%, Mn:0.8~2.0%, P≤0.02%, S≤0.009%, Nb≤0.10%, Cr≤
0.50%, Mo≤0.50%, Al≤0.05%, remaining is Fe and inevitable impurity.
2. torsion beam of automobile steel according to claim 1, it is characterised in that: further include content be 0.002~
0.05% Re.
3. torsion beam of automobile steel according to claim 2, it is characterised in that: the Re content are as follows: 0.01-
0.02%.
4. torsion beam of automobile steel according to claim 1, it is characterised in that: the C content are as follows: 0.06~
0.11%.
5. torsion beam of automobile steel according to claim 1, it is characterised in that: the Si content are as follows: 0.12~
0.14%.
6. torsion beam of automobile steel according to claim 1, it is characterised in that: the Mn content are as follows: 1.46-
1.50%.
7. torsion beam of automobile steel according to claim 1, it is characterised in that: the torsion beam of automobile steel it is micro-
Sight metallographic structure is ferrite and pearlite.
8. the preparation method of any one of -7 torsion beam of automobile steel according to claim 1, it is characterised in that: including as follows
Step:
After molten iron is pre-processed, continuous casting obtains plate after converter smelting, LF refining, RH refining obtain the molten steel of mentioned component
Base；After the slab is heated, obtain hot rolled plate by roughing, finish rolling, roughing final temperature control for 1020~
1120 DEG C, the finish rolling final temperature control is 830~900 DEG C, will be rolled up after the hot rolled plate section cooling at 530~620 DEG C
Acquisition hot-strip is batched at a temperature of taking；The hot rolled coil is obtained into finished product after flattened, pickling.
9. the preparation method of torsion beam of automobile steel according to claim 8, it is characterised in that: the hot rolled plate finger gauge
Lattice variation range is controlled in 1.8~5mm.
10. the preparation method of torsion beam of automobile steel according to claim 8, it is characterised in that: the slab is come out of the stove
Temperature is 1230-1245 DEG C, and the roughing final temperature control is 1040~1050 DEG C, and the finish rolling final temperature control is
850-875℃；The coiling temperature is 550-575 DEG C.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110453154A (en) * | 2019-09-05 | 2019-11-15 | 首钢集团有限公司 | A kind of 700MPa grades of torsion beam of automobile steel and preparation method thereof |
| WO2020259531A1 (en) * | 2019-06-24 | 2020-12-30 | 宝山钢铁股份有限公司 | Cold-rolling strip steel with strength and hardness thereof varying in thickness direction and manufacturing method therefor |
| CN112195404A (en) * | 2020-09-28 | 2021-01-08 | 首钢集团有限公司 | 700MPa grade boron-containing steel for automobile torsion beam and preparation method thereof |
| WO2022022692A1 (en) * | 2020-07-31 | 2022-02-03 | 宝山钢铁股份有限公司 | Steel plate for torsion beam and manufacturing method therefor, and torsion beam and manufacturing method therefor |
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