CN113088813A - Steel for hot-rolled saw blade and production method thereof - Google Patents
Steel for hot-rolled saw blade and production method thereof Download PDFInfo
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- CN113088813A CN113088813A CN202110312021.7A CN202110312021A CN113088813A CN 113088813 A CN113088813 A CN 113088813A CN 202110312021 A CN202110312021 A CN 202110312021A CN 113088813 A CN113088813 A CN 113088813A
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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
- 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
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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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- 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
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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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
- 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
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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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
- C21D2211/008—Martensite
Abstract
The steel for the hot-rolled saw blade comprises the following chemical components in percentage by weight: c: 0.55-0.76%, Si: 0.16-0.40%, Mn: 0.20-0.50%, Cr: 0.20-0.60%, V: 0.01-0.05%, P is less than or equal to 0.010%, S is less than or equal to 0.005%; the production method comprises the following steps: smelting in a converter and then continuously casting into a blank; heating a casting blank; hot rolling for 7 times; laminar cooling; coiling; slowly cooling; carrying out graded quenching; and (6) tempering. The invention adopts medium-high carbon components, so that the hot rolling process is easier to control; due to the organic matching of carbon, manganese and chromium elements, the hardenability and hardenability of the material are ensured, and the heat treatment process is optimized; and because the heat treatment adopts a graded quenching process, the mechanical properties after the heat treatment, namely yield strength, tensile strength, elongation, hardness and the like, are ensured, and the uniformity of phase change is improved, so that the unevenness is less than 1mm, the hardness is 46-52HRC, the elongation is more than or equal to 10 percent, and the higher-end market requirement is met.
Description
Technical Field
The invention relates to steel for tools and a production method thereof, in particular to steel for saw blades and a production method thereof, specifically hot-rolled saw blade steel and a production method thereof.
Background
The diamond welding circular saw blade is a stone cutting tool widely applied, mainly adopts 65Mn, 50Mn2V, 75Cr1 and other steels to manufacture a saw blade matrix, consumes more than ten thousand tons of steel in the year, and is most widely applied to 65 Mn. The main technical requirements of the steel for the saw blade are to ensure the heat treatment quality, not only to achieve enough strength and hardness, but also to ensure that large deformation and warping are not generated, and simultaneously to ensure enough fatigue performance, tempering resistance and the like. Among them, 65Mn and 50Mn2V steels have limited hardenability, are liable to have uneven hardness, and 75Cr1 is liable to have quenching deformation. Meanwhile, the steel for the saw blade with the thickness of less than 2.5mm generally needs to be subjected to the working procedures of cold rolling and the like, so that the pickling, cold rolling and tempering processes are added, the production flow is long, the cost is high, and the defects of cracks, oxidation, decarburization and the like are easy to occur.
After retrieval:
the Chinese patent application No. CN201410418784.X discloses a steel for high-strength metallurgical saw blades and a heat treatment method thereof, and the steel comprises the following chemical components in percentage by weight: 0.30-0.60% of C, 0.15-0.30% of Si, 1.35-1.9% of Mn, less than or equal to 0.02% of P, less than or equal to 0.005% of S, 0.07-0.19% of V, and the balance of Fe, inevitable residual elements and impurities. The steel is smelted, continuously cast and then hot-rolled into a plate, and the plate is subjected to quenching and tempering heat treatment to obtain the metallurgical saw blade steel. It has the following disadvantages: the alloy content is high, if the Mn content reaches 1.9 percent, the hot rolling production difficulty is high, which is mainly reflected in that the alloy high blank breaking risk is high, the hot rolling reduction force requirement is high, and the center segregation is difficult to control; in addition, the high V content causes the high cost of the steel alloy, and the V of 0.1 percent can increase the cost of 175 yuan ton steel.
The document with Chinese patent application number CN201410770445.8 discloses a steel for saw blades, which comprises the following chemical components in percentage by mass: 0.69 to 0.74 percent of C, 0.30 to 0.60 percent of Si, 1.10 to 1.40 percent of Mn, less than or equal to 0.15 percent of Cr, less than or equal to 0.10 percent of Ni, less than or equal to 0.15 percent of Cu, less than or equal to 0.08 percent of Mo, less than or equal to 0.04 percent of Sn, less than or equal to 0.02 percent of Sb, less than or equal to 0.025 percent of Ti, less than or equal to 0.040 percent of P, less than or equal to 0.040. The invention also discloses a production method of the steel for the saw blade. The steel for saw blades has reasonable component control, ensures the compression ratio of steel, has excellent performance and has no cracks on the surface. The production method of the steel for the saw blade is simple, and the steel for the saw blade meeting the requirement of narrow component control of subsequent steel rolling heat treatment is produced by adopting a specific smelting process and narrow component control of carbon. Although expensive V alloy is removed, the carbon content is increased, and the same hot rolling production difficulty is higher; meanwhile, the steel only contains three elements of C, Si and Mn, so that the hardenability of the steel is limited, and the difficulty of heat treatment is high.
The document with Chinese patent application number CN201510965259.4 discloses 'a boron-containing high-carbon saw blade steel and a manufacturing method thereof', wherein the steel comprises the following chemical components in percentage by weight: 0.25 to 0.32 percent; si: 0.20 to 0.50 percent; mn: 0.60% -1.00%; and (3) Alt: 0.010% -0.050%; b: 0.0010 to 0.0020 percent; ca: 0.0010 to 0.0030 percent; p: less than or equal to 0.010 percent; s: less than or equal to 0.0050 percent; n: less than or equal to 0.0050 percent; the CEV range of carbon equivalent is 0.35-0.49%, the rest is Fe and inevitable impurities; the method is completed by a molten steel smelting process route of molten iron desulphurization and slagging-off, converter smelting, LF furnace refining and RH vacuum treatment. Has the advantages that: has good quality and stable comprehensive performance, and completely meets the use requirements. This document improves hardenability by the addition of B element, but too low carbon content does not guarantee the hardness of the material after quenching.
The Chinese patent application No. CN201510367474.4 discloses a steel for a large-diameter thin saw blade base and a manufacturing method thereof, wherein the steel comprises the following chemical components in percentage by weight: c: 0.72% -0.95%, Si: 0.06% -0.40%, Mn: 0.5-0.95%, Cr: 0.10% -0.39%, V: 0.03 to 0.080 percent of Ni, less than or equal to 0.5 percent of Ni, less than or equal to 0.0002 percent of H, less than or equal to 0.015 percent of impurity element P, less than or equal to 0.010 percent of S, less than or equal to 0.010 percent of Al, and the balance of Fe and inevitable impurities. The method comprises the steps of deoxidizing molten steel by using Si, carrying out hot feeding and hot charging on a plate blank, carrying out finish rolling at the beginning of 1050-1150 ℃ and the end of 900-980 ℃, carrying out post-cooling by adopting laminar cooling, cooling to 680-800 ℃ for coiling, carrying out slow cooling in a slow cooling pit within 30 minutes after coiling, heating to 850-980 ℃ after cold punching of hot rolled strip steel into a saw blade matrix, and carrying out heat preservation for 10-40 min for quenching. Although the saw blade has high hardenability, high thermal stability and high toughness, the service life is obviously prolonged, the alloy cost is higher due to more V and Ni elements, namely, the cost of steel per ton is increased by 175 yuan every time 0.1 percent of V is increased; every 0.1% increase in Ni will increase the cost per ton of steel by 100 yuan, resulting in higher cost for this steel grade.
The document with the Chinese patent application number of CN201110130537.6 discloses a production method of an ultra-thin diamond frame saw blade matrix, wherein the matrix is made of nickel-containing steel raw materials, and the material components are selected as follows: the weight percentage is as follows: c0.75-0.85; si is less than 0.35; mn is less than 0.50; 0.20-0.50 of Cr0; s is less than 0.030; p is less than 0.030; ni1.30-2.00; the balance being iron; preparing a base blank with specified size according to different specifications of saw blades; rolling the surface of the base blank to improve the strength of the material; punching riveting holes at two ends of the substrate; riveting dovetail fixing plates at two ends of the matrix to obtain the frame saw blade matrix with the thickness of 1.8 mm. The invention solves the problems of insufficient rigidity and toughness of the current general materials by changing the material quality and adopting a new tension processing method, and the obtained ultra-thin diamond frame saw blade matrix with the thickness of 1.8mm has more than 10 square meters of plate area than the stone crude material with the same specification cut by the diamond frame saw blade matrix with the conventional thickness in the grouping use process; meanwhile, the weight of the base body is correspondingly reduced due to the reduction of the thickness of the base body, the consumption of the product on steel resources and the consumption of electric energy of the base body in the using process are reduced, and the effects of energy conservation and consumption reduction are achieved. This document describes a high alloy saw blade steel produced by hot rolling and cold rolling processes, which is mainly used for frame saw blades after heat treatment; when the Ni-based alloy is mainly insufficient, a higher Ni element is added, and the cost of 100 yuan per ton of steel is increased by 0.1% of NI; meanwhile, the high carbon content and the high alloy content cause difficult hot rolling production, and easily generate defects such as surface defects, cracks, broken strips and the like to cause reduction of yield.
Disclosure of Invention
The invention aims to solve the defects in the technical field and provides the steel for the hot-rolled saw blade and the production method, wherein the thickness of the steel is 1.2-2.5 mm, the product structure is tempered martensite after hot rolling and heat treatment, the yield strength is more than or equal to 1000MPa, the tensile strength is more than or equal to 1400MPa, the hardness is 46-52HRC, the elongation is more than or equal to 10%, and the unevenness is less than or equal to 0.7 mm.
The technical measures for realizing the purpose are as follows:
the steel for the hot-rolled saw blade comprises the following chemical components in percentage by weight: c: 0.55-0.76%, Si: 0.16-0.40%, Mn: 0.20-0.50%, Cr: 0.20-0.60%, V: 0.01-0.05%, P is less than or equal to 0.010%, S is less than or equal to 0.005%, and the balance is iron and inevitable impurities.
Preferably: the weight percentage content of V is 0.017-0.043%.
Preferably: the weight percentage of the C is 0.59-0.68%.
A production method of steel for a hot-rolled saw blade comprises the following steps:
1) smelting in a converter and then continuously casting into a blank; and controlling the superheat degree of molten steel not to exceed 38 ℃ during pouring; the thickness of the casting blank is 46-71 mm;
2) heating the casting blank, controlling the heating temperature of the casting blank to be 1100-1280 ℃, and controlling the in-furnace time of the casting blank to be 30-51 min;
3) carrying out 7-pass hot rolling, and controlling the rolling reduction rates of the 1 st and 2 nd racks to be not lower than 48 percent respectively; rolling the steel plate to the thickness of a finished product in the last pass, wherein the reduction rate is less than 15%, and the final rolling temperature is 850-950 ℃;
4) carrying out laminar cooling, and cooling to the coiling temperature at the cooling speed of 5-20 ℃/s;
5) coiling, wherein the coiling temperature is controlled to be 655-735 ℃;
6) slowly cooling, and cooling to normal temperature at the slow cooling rate of less than or equal to 10 ℃/h;
7) carrying out graded quenching, controlling the quenching heating temperature to be 850-950 ℃, and keeping the temperature at 250-300 ℃ for 5-10 min;
8) tempering is carried out at the temperature of 400-500 ℃.
The mechanism and action of each element and main process of the invention
C: carbon mainly plays a role in improving the strength and hardenability of steel in steel, carbon exists in a hot rolling structure in a form of carbide to form pearlite, bainite and the like, the carbon exists in a solid solution state after quenching, the structure is subjected to phase transformation strengthening, and the carbide is precipitated after tempering to play a role in precipitation strengthening. Too high carbon content may reduce the plasticity and toughness of the steel, and too low carbon content may reduce the hardenability of the steel, which is not favorable for the heat treatment of the saw blade. The carbon content of the invention is preferably controlled within the range of 0.59-0.68%.
Si: silicon enhances the strength of steel by solution strengthening and refining pearlite sheet spacing in steel, but reduces plasticity and toughness and increases surface defects of hot rolled sheet. Silicon is the main deoxidizer and is controlled to be 0.16-0.40%.
Mn: manganese in steel improves the strength of steel, combines with S in steel to form MnS, and eliminates the influence of S element. Mn is a good deoxidizer, but in the present invention, Mn content of more than 0.50% easily causes center segregation of a slab during continuous casting, and reduces uniformity of the material, so that Mn content is controlled to 0.20-0.50%.
Cr: the chromium element can improve the strength, the hardenability and the tempering resistance, and reduce the decarburized layer of the hot rolled plate, but if the content of the chromium element is lower than the limited range, the phase change is caused to occur in advance, the hardenability of the material is reduced, and simultaneously, the decarburized layer of the hot rolled plate is increased, and the surface hardness of the saw blade is reduced; if the content is higher than the limited range, a large amount of carbon reacts with chromium to generate carbide liquation and banding, so that the saw blade structure performance after heat treatment is uneven, and simultaneously, because a large amount of carbon and chromium are consumed, the hardenability and the hardenability of the material are reduced, so that the content of Cr is controlled to be 0.20-0.60%.
V: vanadium can refine structure grains, improve the strength and the toughness and simultaneously improve the tempering resistance, but if the content of vanadium is lower than a limited range, the vanadium can cause the material grains to be coarse, simultaneously reduce the tempering resistance of the saw blade after heat treatment and be easy to soften in the using process; if the V content is higher than the limited range, the cost is wasted, the alloy cost is increased, but the performance improvement is limited, so the V content is controlled to be 0.01-0.05%, and the preferable range is 0.017-0.043%.
The superheat degree of the molten steel is controlled not to exceed 38 ℃ during pouring, and the superheat degree of the molten steel is controlled to be not more than 38 ℃ because the superheat degree of the molten steel can effectively control the center segregation of continuous casting, and meanwhile, the castability of continuous casting production is considered, and the occurrence of broken pouring is prevented.
The rolling reduction of the No. 1 and No. 2 frames is controlled not to be lower than 48 percent respectively; the final pass is rolled to the thickness of a finished product, the reduction rate is less than 15%, the final rolling temperature is 850-950 ℃, because of the short-flow direct finish rolling, crystal grains are refined through the 1 st and 2 nd racks, and the phenomena of coarse crystals and mixed crystals are prevented; the last pass controls the small reduction rate and ensures the finish rolling temperature to control the shape of the hot rolled plate and prevent unqualified shape.
The heating temperature of the quenching is controlled to be 850-950 ℃; and preserving heat for 5-10 min at the temperature of 250-300 ℃ and then cooling in air, because tests prove that the heating temperature can effectively dissolve cementite and control the growth of crystal grain size, and the heat preservation temperature can effectively reduce quenching internal stress and prevent poor quenching plate shape and quenching cracking.
Compared with the prior art, the hot rolling process is easier to control due to the adoption of the medium-high carbon composition design; the lower alloy elements are beneficial to controlling the uniformity of the components, and simultaneously, the hardenability and hardenability of the material are ensured and the heat treatment process is optimized due to the organic matching of the carbon, manganese and chromium elements; the heat treatment process adopts a proper graded quenching process, so that the mechanical properties of the material after heat treatment, including yield strength, tensile strength, elongation, hardness and the like, are mainly ensured, the uniformity of phase change is improved, the unevenness of the product is ensured to be less than 1mm, and convenience is provided for processing finished products; because the hot rolled plate is directly fed and quenched, the whole production flow is shortened, the hot rolled plate is fully utilized for one-step forming, the carbon emission in the cold rolling and annealing processes is reduced, and the green manufacturing process of hot strip cooling is realized; the invention can be cooled in hot zone, the thickness of the product is 1.2-2.5 mm, the yield strength is more than or equal to 1000MPa, the tensile strength is more than or equal to 1400MPa, the unevenness is less than or equal to 0.7mm, after hot rolling and heat treatment, the product structure is tempered martensite, the hardness is 46-52HRC, the elongation is more than or equal to 10%, and the higher-end market requirement is met.
Drawings
FIG. 1 is a metallographic structure of a hot-rolled sheet according to the invention;
FIG. 2 is a metallographic structure of a steel sheet of the present invention after heat treatment.
Detailed Description
The invention is further described below with reference to specific examples:
table 1 is a list of values of the components of each example and comparative example of the present invention;
table 2 is a list of values of main process parameters of each example and comparative example of the present invention;
table 3 is a table of the results of the performance tests of the examples of the present invention and the comparative examples.
The preparation method comprises the following steps:
1) smelting in a converter and then continuously casting into a blank; and controlling the superheat degree of molten steel not to exceed 38 ℃ during pouring; the thickness of the casting blank is 46-71 mm;
2) heating the casting blank, controlling the heating temperature of the casting blank to be 1100-1280 ℃, and controlling the in-furnace time of the casting blank to be 30-51 min;
3) carrying out 7-pass hot rolling, and controlling the rolling reduction rates of the 1 st and 2 nd racks to be not lower than 48 percent respectively; rolling the steel plate to the thickness of a finished product in the last pass, wherein the reduction rate is less than 15%, and the final rolling temperature is 850-950 ℃;
4) carrying out laminar cooling, and cooling to the coiling temperature at the cooling speed of 5-20 ℃/s;
5) coiling, wherein the coiling temperature is controlled to be 655-735 ℃;
6) slowly cooling, and cooling to normal temperature at the slow cooling rate of less than or equal to 10 ℃/h;
7) carrying out graded quenching, controlling the quenching heating temperature to be 850-950 ℃, and keeping the temperature at 250-300 ℃ for 5-10 min;
8) tempering is carried out at the temperature of 400-500 ℃.
TABLE 1 chemical composition List for inventive and comparative examples
TABLE 2 List of the main process parameters for the examples of the invention and the comparative examples
TABLE 2
TABLE 3 test results of mechanical Properties of examples and comparative examples of the present invention
Description of the drawings:
it can be seen from table 3 that the saw blade steel products produced according to the invention meet the performance and plate shape requirements, the strength is comparable to the comparative examples, and the elongation and the unevenness are significantly better than the comparative examples.
The embodiments of the present invention are merely preferred examples, and are not intended to limit the scope of the claims.
Claims (4)
1. The steel for the hot-rolled saw blade comprises the following chemical components in percentage by weight: c: 0.55-0.76%, Si: 0.16-0.40%, Mn: 0.20-0.50%, Cr: 0.20-0.60%, V: 0.01-0.05%, P is less than or equal to 0.010%, S is less than or equal to 0.005%, and the balance is iron and inevitable impurities.
2. The steel for a hot rolled saw blade according to claim 1, wherein: the weight percentage content of V is 0.017-0.043%.
3. The steel for a hot rolled saw blade according to claim 1, wherein: the weight percentage of the C is 0.59-0.68%.
4. The method for producing a steel for hot rolled saw blades as claimed in claim 1, comprising the steps of:
1) smelting in a converter and then continuously casting into a blank; and controlling the superheat degree of molten steel not to exceed 38 ℃ during pouring; the thickness of the casting blank is 46-71 mm;
2) heating a casting blank, controlling the heating temperature of the casting blank to be 1100-1280 ℃, and controlling the furnace time of the casting blank to be 30-51 min;
3) carrying out 7-pass hot rolling, and controlling the rolling reduction rates of the 1 st and 2 nd racks to be not lower than 48 percent respectively; rolling the steel plate to the thickness of a finished product in the last pass, wherein the reduction rate is less than 15%, and the final rolling temperature is 850-950 ℃;
4) carrying out laminar cooling, and cooling to the coiling temperature at the cooling speed of 5-20 ℃/s;
5) coiling, wherein the coiling temperature is controlled to be 655-735 ℃;
6) slowly cooling, and cooling to normal temperature at the slow cooling rate of less than or equal to 10 ℃/h;
7) carrying out graded quenching, controlling the quenching heating temperature to be 850-950 ℃, and keeping the temperature at 250-300 ℃ for 5-10 min;
8) tempering is carried out at the temperature of 400-500 ℃.
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Cited By (4)
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| CN114058951A (en) * | 2021-10-19 | 2022-02-18 | 首钢集团有限公司 | 65Mn saw blade steel and preparation method thereof |
| CN115558854A (en) * | 2022-09-27 | 2023-01-03 | 首钢集团有限公司 | High-deformation-resistance hot-rolled strip steel for buckling circular saw and preparation method thereof |
| CN115595501A (en) * | 2022-09-26 | 2023-01-13 | 首钢集团有限公司（Cn） | CrNiMo alloy strip steel and preparation method thereof |
| CN115558854B (en) * | 2022-09-27 | 2024-04-23 | 首钢集团有限公司 | Hot-rolled strip steel for high-deformation-resistance buckling circular saw and preparation method thereof |
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|---|---|---|---|---|
| CN114058951A (en) * | 2021-10-19 | 2022-02-18 | 首钢集团有限公司 | 65Mn saw blade steel and preparation method thereof |
| CN114058951B (en) * | 2021-10-19 | 2023-04-07 | 首钢集团有限公司 | 65Mn saw blade steel and preparation method thereof |
| CN115595501A (en) * | 2022-09-26 | 2023-01-13 | 首钢集团有限公司（Cn） | CrNiMo alloy strip steel and preparation method thereof |
| CN115558854A (en) * | 2022-09-27 | 2023-01-03 | 首钢集团有限公司 | High-deformation-resistance hot-rolled strip steel for buckling circular saw and preparation method thereof |
| CN115558854B (en) * | 2022-09-27 | 2024-04-23 | 首钢集团有限公司 | Hot-rolled strip steel for high-deformation-resistance buckling circular saw and preparation method thereof |
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