CN109576569B - Steel for automobile torsion beam and preparation method thereof - Google Patents
Steel for automobile torsion beam and preparation method thereof Download PDFInfo
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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
- 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
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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
- 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
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- 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
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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
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- 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
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- 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
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
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Abstract
The invention provides a steel for an automobile torsion beam and a preparation method thereof, wherein the steel for the automobile torsion beam comprises the following components in percentage by mass: c: 0.03 to 0.22%, Si: 0.1-0.4%, Mn: 0.8-2.0%, P is less than or equal to 0.02%, S is less than or equal to 0.009%, Nb is less than or equal to 0.10%, Cr is less than or equal to 0.50%, Mo is less than or equal to 0.50%, Re: 0.002-0.05%, Al less than or equal to 0.05%, and the balance of Fe and inevitable impurities. According to the invention, through the proportioning design of the components and the selection of the corresponding preparation method, and the parameters in the method are adjusted, the steel material for the high-weldability automobile torsion beam with excellent bending forming performance is obtained, after the steel material is welded and formed, the surface layer of the part plate is a high-hardness area, the center part of the part plate is a low-hardness area, and the surface-core hardness difference can be maintained after annealing heat treatment, so that the steel material has high comprehensive mechanical performance and can exert excellent fatigue performance.
Description
Technical Field
The invention belongs to the technical field of steel smelting, and particularly relates to a steel for an automobile torsion beam and a preparation method thereof.
Background
When the automobile runs on a rugged road, the torsion beam needs to bear longitudinal force transmitted by wheels and alternating load in the vertical direction, the stress at the cross beam is high, and fatigue is easy to generate. Therefore, the torsion beam must have high fatigue strength while having high strength.
However, in the production and manufacturing process of the torsion beam, the welded steel pipe needs to be subjected to large-degree cold plastic deformation, so that large residual stress is generated in a deformation area, the superposition of the residual stress of a part of area and external load even can cause the material to generate plastic deformation to lose the bearing capacity, and the beneficial residual stress can be eliminated while the stress relief annealing is performed, so that the steel is softened and the fatigue property is reduced.
Disclosure of Invention
In order to solve the above-mentioned drawbacks of the prior art, a primary object of the present invention is to provide a steel material for a torsion beam for an automobile, which does not reduce fatigue strength and has excellent bending formability and high weldability, and a method for manufacturing the same.
In order to achieve the purpose, the invention adopts the following technical scheme that the steel for the automobile torsion beam comprises the following components in percentage by mass: c: 0.03 to 0.22%, Si: 0.1-0.4%, Mn: 0.8-2.0%, P is less than or equal to 0.02%, S is less than or equal to 0.009%, Nb is less than or equal to 0.10%, Cr is less than or equal to 0.50%, Mo is less than or equal to 0.50%, Al is less than or equal to 0.05%, and the balance is Fe and inevitable impurities.
Further preferably, the alloy further comprises Re with the content of 0.002-0.05%.
As a further preference, the Re content is: 0.01 to 0.02 percent.
As a further preference, the C content is: 0.06-0.11%.
As a further preference, the Si content is: 0.12 to 0.14 percent.
As a further preference, the Mn content is: 1.46-1.50%.
More preferably, the microstructure of the steel material for an automobile torsion beam is ferrite + pearlite.
Another object of the present invention is to provide a method for preparing the steel for an automobile torsion beam, comprising the steps of:
after molten iron is pretreated, molten steel with the components is obtained through converter smelting, LF refining and RH refining, and then a plate blank is obtained through continuous casting; heating the plate blank, then carrying out rough rolling and finish rolling to obtain a hot rolled plate, controlling the finish temperature of the rough rolling to be 1020-1120 ℃, controlling the finish temperature of the finish rolling to be 830-900 ℃, carrying out laminar cooling on the hot rolled plate, and then coiling at the coiling temperature of 530-620 ℃ to obtain hot rolled strip steel; and flattening and pickling the hot rolled coil to obtain a finished product.
More preferably, the thickness specification of the hot-rolled plate is controlled within a range of 1.8 to 5 mm.
Preferably, the tapping temperature of the slab is 1230-1245 ℃, the finishing temperature of the rough rolling is 1040-1050 ℃, and the finishing temperature of the finish rolling is 850-875 ℃; the coiling temperature is 550-575 ℃.
The invention has the beneficial effects that: the steel for the automobile torsion beam comprises the following components in percentage by mass: c: 0.03 to 0.22%, Si: 0.1-0.4%, Mn: 0.8-2.0%, P is less than or equal to 0.02%, S is less than or equal to 0.009%, Nb is less than or equal to 0.10%, Cr is less than or equal to 0.50%, Mo is less than or equal to 0.50%, and the balance is Fe and inevitable impurities. According to the invention, through the proportioning design of the components and the selection of the corresponding preparation method, and the parameters in the method are adjusted, the steel material for the high-weldability automobile torsion beam with excellent bending forming performance is obtained, after the steel material is welded and formed, the surface layer of the part plate is a high-hardness area, the center part of the part plate is a low-hardness area, and the surface-core hardness difference can be maintained after annealing heat treatment, so that the steel material has high comprehensive mechanical performance and can exert excellent fatigue performance.
Drawings
Fig. 1 is a schematic view of a microstructure of a steel material for an automobile torsion beam prepared in an example of the present invention.
FIG. 2a is a schematic diagram of TEM extraction replica of a sample before heat treatment in S2 according to the present invention.
FIG. 2b is a schematic diagram of TEM extraction replica of the sample after heat treatment in S2 according to the present invention.
Detailed Description
The invention provides the steel for the automobile torsion beam and the preparation method thereof, so that the defect that the steel is softened to reduce the fatigue property in the production and manufacturing process of the existing torsion beam is overcome.
In order to solve the above-mentioned defects, the main idea of the embodiment of the present invention is:
the steel for the automobile torsion beam comprises the following components in percentage by mass: c: 0.03 to 0.22%, Si: 0.1-0.4%, Mn: 0.8-2.0%, P is less than or equal to 0.02%, S is less than or equal to 0.009%, Nb is less than or equal to 0.10%, Cr is less than or equal to 0.50%, Mo is less than or equal to 0.50%, Al is less than or equal to 0.05%, and the balance is Fe and inevitable impurities.
The content of C is 0.03-0.22%, carbon and alloying elements such as Nb and Mo form microalloy carbide to play a role in precipitation strengthening, and the welding property is adversely affected by higher carbon content, so that a low-carbon system is selected.
According to the invention, the Si content is 0.1-0.4%, and the influence of silicon on the performance of a welding seam during welding is reduced by taking a lower silicon content.
The Mn content of the invention is 0.8-2.0%, the matrix strength is improved by adding more than 0.8% of Mn, and the weldability of the material is influenced and the temper brittleness tendency is increased by excessively high content.
The P and S in the invention have adverse effect on the material performance, and the content of P and S in the steel should be controlled as strictly as possible.
In the invention, Al is used as a deoxidizer, and exists in the form of inclusions in steel clock so as to harm the material performance, so that the Al content in the material is required to be lower, and the Al content is lower than 0.05%.
In the invention, a small amount of Nb can fully exert the effects of fine grain strengthening and precipitation strengthening, and the tempering stability of the material is increased in the tempering process. Nb belongs to noble metal and the content is not more than 0.1 percent.
The Cr content of the invention is lower than 0.50%, proper amount of Cr is added to improve the matrix strength, and the Cr is supplemented and precipitated in the annealing process to inhibit annealing and softening.
The content of Mo in the invention is lower than 0.50%, Mo can be additionally precipitated in the annealing process, the size of a precipitated phase in the annealing process is reduced, the tempering stability of the material is improved, the material can be annealed at a higher temperature, and the residual stress is fully eliminated.
According to the embodiment of the invention, the rare earth element Re is added into the component system to optimize the shape and size of the inclusions in the steel and reduce the segregation of impurity elements in grain boundaries. The spherical rare earth sulfide still keeps fine spherical or spindle shape and is uniformly distributed in the steel, strip MnS distributed along the rolling direction of the steel is eliminated, meanwhile, the rare earth element is enriched in a crystal boundary, the segregation of impurity elements in the crystal boundary is reduced, the crystal boundary is strengthened, the delay of austenite recrystallization is inhibited, the growth temperature of austenite crystal grains is improved, the crystal grains are refined, and the strength and toughness of the material are improved. The addition of the rare earth element reduces the solid solution temperature of carbonitride, promotes the solid solution of second phase particles such as (Nb, Mo, Cr) C and the like, and can further promote the precipitation of (Nb, Mo, Cr) C in the thermal deformation process, thereby improving the precipitation strengthening effect of alloy elements such as niobium, molybdenum and the like. The combined action of the above influencing factors enables the steel material of the embodiment of the invention to have excellent bending formability and weldability, and simultaneously improves the fatigue property of the formed part.
In addition, the preparation method corresponding to the component system is selected, and parameters in the method are adjusted, and the preparation method of the steel for the automobile torsion beam comprises the following steps:
after molten iron is pretreated, molten steel with the components is obtained through converter smelting, LF refining and RH refining, and then a plate blank is obtained through continuous casting; heating the plate blank, and then carrying out rough rolling and finish rolling to obtain a hot rolled plate, wherein the thickness specification change range of the hot rolled plate is controlled to be 1.8-5 mm, the finish temperature of the rough rolling is controlled to be 1020-1120 ℃, the finish temperature of the finish rolling is controlled to be 830-900 ℃, and the hot rolled plate is cooled in a laminar flow manner and then coiled at the coiling temperature of 530-620 ℃ to obtain hot rolled strip steel; and flattening and pickling the hot rolled coil to obtain a finished product.
In order to fully dissolve the microalloy precipitated phase in the slab, ensure the homogenization of the components and obtain a uniform austenite structure, the heating temperature of the slab is set to be about 1230-1245 ℃. And finishing rolling at low temperature within the temperature range of an austenite non-recrystallization zone, avoiding rolling in an austenite ferrite two-phase zone, and controlling the rolling temperature to be 830-900 ℃ so that austenite fully accumulates deformation to improve ferrite nucleation rate. And controlling the coiling temperature to 530-620 ℃ to obtain a large amount of fine microalloy precipitated phase particles so as to achieve the purpose of matrix precipitation strengthening. The microstructure of the finally obtained plate is ferrite and pearlite, so that the product has good bending performance.
According to the embodiment of the invention, a C-Si-Mn-Nb-Mo-Cr component system is adopted, rolling and laminar cooling are controlled, and a certain flattening and pickling process is matched to obtain the hot-rolled pickled strip steel with excellent bending formability at the level of 700MPa of tensile strength and high welding performance, and a proper heat treatment process is adopted to enable the precipitated fine second phase to play a precipitation strengthening role to compensate for strength reduction caused by residual stress elimination.
After the torsion beam is manufactured by the steel material in the embodiment of the invention, the steel material is subjected to work hardening in certain areas of the part through bending and processing forming, so that great residual stress is generated, the surface hardness of the part is increased, the hardness is increased slightly due to smaller deformation of the center, and a certain hardness difference exists between the surface cores, which shows that the surface hardness and the core hardness are soft. However, the residual stress associated with the work forming lowers the fatigue characteristics of the material to some extent, so that the torsion beam produced from the steel material of the present invention is subjected to annealing heat treatment, and the resulting residual stress is eliminated by making the above-mentioned rational heat treatment production method, thereby improving the fatigue strength. When the residual stress is eliminated by annealing heat treatment, fine microalloy carbide such as (Nb, Mo, Cr) C is precipitated on dislocation and in a tissue matrix, so that the reduction of the surface hardness and the strength caused by the disappearance of the residual stress can be effectively relieved, and the hardness difference between the surface layer and the core in the thickness direction of the steel material caused by bending and forming after the annealing heat treatment can be effectively maintained.
After the steel for the automobile torsion beam prepared by the steel in the embodiment of the invention is bent and formed, the difference between the Vickers hardness at the center of the plate thickness and the highest Vickers hardness within 0.4mm from the plate surface is 20-40 points. And a difference between the Vickers hardness at the center of the sheet thickness after heat treatment and the maximum value of the Vickers hardness within 0.4mm from the surface is 30 to 70 points (T is absolute temperature, and T is time unit of hour) under the condition that the tempering parameter lambda defined by lambda is 15000 to 17000.
In order to make the aforementioned and other objects, features, and advantages of the present invention comprehensible, several embodiments accompanied with examples are described below to describe a steel material for a torsion beam of an automobile and a method for manufacturing the same according to the present invention.
The preparation method of the steel for the automobile torsion beam comprises the following steps:
after molten iron is pretreated, molten steel is obtained through converter smelting, LF refining and RH refining, and then a plate blank is obtained through continuous casting; the actual chemical composition of the molten steel is shown in Table 1.
TABLE 1 chemical composition (wt%)
Heating the plate blank, wherein the tapping temperature of the plate blank is 1230-1245 ℃, obtaining a hot rolled plate through rough rolling and finish rolling, the thickness specification variation range of the hot rolled plate is controlled to be 1.8-5 mm, the finish temperature of the rough rolling is controlled to be 1020-1120 ℃, the finish temperature of the finish rolling is controlled to be 830-900 ℃, cooling the hot rolled plate laminar flow, and coiling at the coiling temperature of 530-620 ℃ to obtain a hot rolled strip steel; and flattening and pickling the hot rolled coil to obtain a finished product. The process parameters of each example are shown in Table 2;
TABLE 2
Fig. 1 is a schematic view of a microstructure of a steel material for an automobile torsion beam prepared in example 3 of the present invention. Wherein the microstructure of the plate is as follows: ferrite and pearlite with the proportion of 35 percent (volume fraction), and the good bending property of the product is ensured by the ferrite and pearlite of the matrix structure.
In order to prove the performance of the steel material for the torsion beam of the automobile prepared by the embodiment of the invention, the following tests are carried out:
the 4 types of test steel pipes obtained in the above examples S1 to S4 were press-formed according to the production procedure of the tubular beam for a torsion beam, sampled in the deformation region, subjected to a hardness test using a microhardness tester (load is HV0.1), and the difference in hardness between the central portion and a portion (0.3 mm from the surface) at a fixed distance from the surface in the thickness direction of the deformation region was measured. The samples were heat treated as in table 3 and then again tested for hardness measurement and the data is recorded as in table 3.
TABLE 3
| Numbering | Annealing temperature C | Holding time h | Difference in hardness |
| 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 |
The surface hardness value of the test sample is increased in the surface deformation area due to the residual stress. After annealing heat treatment, residual stress disappears, microalloy carbonitride is supplemented and separated out, and surface hardness reduction caused by the disappearance of the residual stress is compensated.
And secondly, carrying out transmission electron microscope extraction replica observation on the samples with the serial numbers of S2 before and after heat treatment to observe the change of precipitated phase forms and distribution in the deformation region. As shown in fig. 2a-2b, a large number of fine precipitated phases were present in the matrix after heat treatment, demonstrating that the fine microalloy carbonitride precipitated phases compensate for the decrease in surface hardness caused by the disappearance of residual stress after heat treatment. The residual stress of the formed part is removed through annealing heat treatment, and the strength of the part is improved through a precipitation strengthening mechanism.
The technical scheme in the embodiment of the application at least has the following technical effects or advantages:
the steel for the automobile torsion beam comprises the following components in percentage by mass: c: 0.03 to 0.22%, Si: 0.1-0.4%, Mn: 0.8-2.0%, P is less than or equal to 0.02%, S is less than or equal to 0.009%, Nb is less than or equal to 0.10%, Cr is less than or equal to 0.50%, Mo is less than or equal to 0.50%, Re: 0.002-0.05%, Al less than or equal to 0.05%, and the balance of Fe and inevitable impurities. According to the invention, through the proportioning design of the components and the selection of the corresponding preparation method, and the parameters in the method are adjusted, the steel material for the high-weldability automobile torsion beam with excellent bending forming performance is obtained, after the steel material is welded and formed, the surface layer of the part plate is a high-hardness area, the center part of the part plate is a low-hardness area, and the surface-core hardness difference can be maintained after annealing heat treatment, so that the steel material has high comprehensive mechanical performance and can exert excellent fatigue performance.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only illustrative of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A steel material for an automobile torsion beam is characterized in that: comprises the following components in percentage by mass:
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％，
the balance of Fe and inevitable impurities;
the RE content is 0.002-0.05%;
the microscopic metallographic structure of the steel for the automobile torsion beam is ferrite and pearlite;
after the steel for the automobile torsion beam is bent and formed, the difference between the Vickers hardness at the center of the plate thickness and the maximum Vickers hardness within 0.4mm from the plate surface is 20-40 points
Defined tempering parameters
The difference between the Vickers hardness of the center of the plate thickness after heat treatment under the condition of 15000-17000 and the maximum Vickers hardness within 0.4mm from the surface is 30-70 points, wherein T is the absolute temperature, and T is the time unit of hour;
the preparation method of the steel for the automobile torsion beam comprises the following steps:
after molten iron is pretreated, molten steel with the components is obtained through converter smelting, LF refining and RH refining, and then a plate blank is obtained through continuous casting; heating the plate blank, then carrying out rough rolling and finish rolling to obtain a hot rolled plate, controlling the finish temperature of the rough rolling to be 1040-1050 ℃ and the finish temperature of the finish rolling to be 850-875 ℃, carrying out laminar cooling on the hot rolled plate, and then coiling at the coiling temperature of 550-575 ℃ to obtain hot rolled strip steel; flattening and pickling the hot rolled coil to obtain a finished product;
the thickness specification variation range of the hot rolled plate is controlled to be 1.8-5 mm;
the discharging temperature of the plate blank is 1230-1245 ℃.
2. The steel material for an automobile torsion beam according to claim 1, characterized in that: the RE content is as follows: 0.01 to 0.02 percent.
3. The steel material for an automobile torsion beam according to claim 1, characterized in that: the content of C is as follows: 0.06-0.11%.
4. The steel material for an automobile torsion beam according to claim 1, characterized in that: the Si content is as follows: 0.12 to 0.14 percent.
5. The steel material for an automobile torsion beam according to claim 1, characterized in that: the Mn content is as follows: 1.46 to 1.50 percent.
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| CN112126757A (en) * | 2019-06-24 | 2020-12-25 | 宝山钢铁股份有限公司 | Thick-direction variable-strength hardness cold-rolled strip steel and manufacturing method thereof |
| CN110453154B (en) * | 2019-09-05 | 2021-01-15 | 首钢集团有限公司 | 700 MPa-grade steel for automobile torsion beam and preparation method thereof |
| CN114058942B (en) * | 2020-07-31 | 2022-08-16 | 宝山钢铁股份有限公司 | Steel plate for torsion beam and manufacturing method thereof, torsion beam and manufacturing method thereof |
| CN112195404B (en) * | 2020-09-28 | 2022-04-19 | 首钢集团有限公司 | 700MPa grade boron-containing steel for automobile torsion beam and preparation method thereof |
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| CN106591716A (en) * | 2016-11-25 | 2017-04-26 | 河钢股份有限公司承德分公司 | Automobile beam steel with high toughness and tensile strength of 750 MPa, and production method thereof |
| CN106521327A (en) * | 2016-12-27 | 2017-03-22 | 首钢总公司 | Hot-rolled pickled steel strip with high broaching performance and production 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 |
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