CN112126855A - Production method of cold-rolled weather-resistant steel with yield strength of more than 310MPa - Google Patents
Production method of cold-rolled weather-resistant steel with yield strength of more than 310MPa Download PDFInfo
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- CN112126855A CN112126855A CN202010950167.XA CN202010950167A CN112126855A CN 112126855 A CN112126855 A CN 112126855A CN 202010950167 A CN202010950167 A CN 202010950167A CN 112126855 A CN112126855 A CN 112126855A
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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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- 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
- C21D8/0236—Cold 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
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Metal Rolling (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention relates to a production method of cold-rolled weather-resistant steel with yield strength of more than 310MPa, which is characterized in that a cold-rolled weather-resistant steel strip product with the thickness of 0.5-2.5 mm is obtained through reasonable chemical composition design, steelmaking smelting, hot rolling process, acid rolling process and continuous annealing process control, and the internal tissues of the cold-rolled weather-resistant steel product are ferrite, pearlite and cementite; the mechanical property result of the finished cold-rolled weather-resistant steel product is that the yield strength is more than or equal to 310MPa, the tensile strength is more than or equal to 450MPa, the elongation after fracture is more than or equal to 28 percent, the mechanical property is stable, the forming and atmospheric corrosion resistance of the steel strip product are excellent, and the steel strip product can be applied to the relevant fields of air preheaters, plate heat exchangers and the like. The cold-rolled weather-resistant steel product provided by the invention has the advantages that the addition amount of alloy elements such as Mn, Cu, Cr, Ni and the like is small, and the performance is optimized through controlling the steelmaking, hot rolling and cold rolling processes, so that the production cost of the product is reduced.
Description
Technical Field
The invention belongs to the technical field of steel rolling, and particularly relates to a production method of cold-rolled weather-resistant steel with yield strength of more than 310 MPa.
Background
The main cause of the damage of the steel products is corrosion, and the method for solving the corrosion problem generally increases the corrosion allowance or coats antirust paint. The former causes material waste, and the latter causes maintenance cost increase and sometimes affects normal use because maintenance recoating is required periodically. In another method, a metal coating is used for protection, mainly hot dip coating or zinc or aluminum spraying is adopted, but the application of the metal coating has the problems of higher cost, environmental pollution, difficult application of large-sized components, difficult welding and the like.
The weathering resistant steel is also called atmospheric corrosion resistant steel, and a certain amount of alloy elements such as Cu, P, Cr, Ni and the like are added into common steel products, so that the atmospheric corrosion resistance of the steel is improved. The weather resistance of the weathering steel is 2-8 times of that of common carbon steel, so that the material has the characteristics of corrosion resistance, long service life, thinning, consumption reduction, labor saving, energy saving and the like, and can be coated, used naked or subjected to stabilization treatment. In areas without serious atmospheric pollution or extra humidity, the weathering steel can be directly exposed in the atmosphere without coating, and generally after the annual time, a rust layer is gradually stable, corrosion does not develop any more, so that the problems of paint aging and the like do not exist, coating maintenance is not needed, the maintenance cost is greatly reduced, and the loss caused by the influence of painting on use and the like is avoided.
The development of the weathering steel in China starts late, the development starts in the beginning of the last 60 th generation, but with the development of national economy, the development requirements of various infrastructures and the environmental protection requirements, the demand of the weathering steel is increasing day by day, and the weathering steel products in China are mainly used in the fields of railway vehicles, containers, bridges, towers and the like. According to incomplete statistics, the annual consumption of the current domestic weathering steel products exceeds 400 million tons. With the stricter requirements of the market on the surface quality, the dimensional precision, the thickness specification and the like of the weathering steel products, the application fields of the cold-rolled weathering steel products with thin specifications are more and more, and the greater development requirements exist.
Disclosure of Invention
The invention aims to provide a production method of cold-rolled weather-resistant steel with yield strength of more than 310MPa, a steel strip product is excellent in machine shaping and atmospheric corrosion resistance, and the method can be applied to the relevant fields of air preheaters, plate heat exchangers and the like.
The technical scheme adopted by the invention for solving the technical problems is as follows: a production method of cold-rolled weathering steel with yield strength of more than 310MPa comprises the following main chemical components in percentage by mass: c: 0.060% to 0.090%, Si: 0.25-0.45%, Mn: 0.20% -0.40%, P: 0.070% -0.090%, S: less than or equal to 0.020%, Als: 0.015% -0.050%, Ni: 0.10-0.25%, Cr: 0.30% -0.45%, Cu: 0.20 to 0.35 percent of Fe and the balance of inevitable impurities and residual elements; the production method specifically comprises the following steps: 1) KR desulfurization; 2) smelting in a converter; 3) LF refining; 4) continuous casting; 5) hot rolling; 6) acid washing and cold rolling; 7) continuous annealing; 8) and (6) flattening and dividing the rolls.
Further, the chemical components of the cold-rolled weathering steel can be added with one or more of the following trace alloy elements: nb: 0.015% -0.030%, V: 0.02% -0.08%, Ti: 0.02% -0.06%, Mo: less than or equal to 0.30 percent, Zr: less than or equal to 0.15 percent.
Further, KR desulfurization in the step 1) requires that S is less than or equal to 0.025 percent after KR is finished; the slag skimming rate requires that the bright surface is more than or equal to 80 percent.
Further, the end point temperature of the converter smelting converter in the step 2) is 1640-1690 ℃; adopting a sliding plate to block slag; the outlet temperature is 1570-1610 ℃.
Further, calcium treatment is carried out after LF refining LF treatment in the step 3) is finished; the soft blowing time is more than or equal to 10 min.
Further, the continuous casting in the step 4) is performed at a casting speed of not less than 0.9m/min and at a constant casting speed; peeling the head blank and the tail blank; a continuous cast slab having a thickness of 230mm was obtained, and the slab quality was examined.
Further, the hot rolling in the step 5) is a 1+5+7 three-stage rolling process, and specifically, the rough rolling R1 rolling mill is 1-pass rolling; the rough rolling R2 rolling mill is reversible rolling in 5 passes in a reciprocating way; the finishing mill group is 7-frame continuous rolling; the heating temperature of the plate blank is 1240-1280 ℃; the finish rolling temperature is 860-900 ℃; the coiling temperature is 600-640 ℃; laminar cooling adopts a front-section cooling process and a U-shaped coiling mode, and the lengths of a hot head and a hot tail are increased by 50m respectively at 40 ℃; and (3) welding the hot-rolled steel coil after uncoiling by using a laser welding machine, and performing butt welding on the front coil and the rear coil of the weather-resistant steel of the same steel type.
Further, the temperature of acid liquor in the acid washing and cold rolling in the step 6) is 70-90 ℃; the acid liquor concentration of the final pickling tank is more than or equal to 140 g/L; the conductivity of the final rinsing water is less than or equal to 30 us/cm; adopting a five-stand rolling mill to carry out cold continuous rolling; the saponification value of the emulsion is more than or equal to 160 mgKOH/g; the total rolling reduction rate of the cold rolling is 55-75%, and the rolling reduction rate model of each machine frame automatically calculates.
Further, the continuously annealed and acid-rolled steel coil in the step 7) is uncoiled and then welded by a narrow lap welder, and a mode of butt welding the head and the tail of front and rear coils of the same type of weather-resistant steel is adopted; the soaking temperature of the annealing furnace is 760 ℃ to 780 ℃; the overaging outlet temperature is 345-375 ℃.
Further, the flattening elongation of the flattening and coil splitting in the step 8) is 0.5% -0.9%.
The invention has the following beneficial effects: the method comprises the steps of controlling through reasonable chemical composition design, steelmaking smelting, hot rolling process, acid rolling process and continuous annealing process to obtain a cold-rolled weather-resistant steel strip product with the thickness of 0.5-2.5 mm, wherein the internal structure of the cold-rolled weather-resistant steel product is ferrite, pearlite and cementite, and the grain size grade is 9-11 grade; the mechanical property result of the finished cold-rolled weather-resistant steel product is that the yield strength is more than or equal to 310MPa, the tensile strength is more than or equal to 450MPa, the elongation after fracture is more than or equal to 28 percent, the mechanical property is stable, the forming and atmospheric corrosion resistance of the steel strip product are excellent, and the steel strip product can be applied to the relevant fields of air preheaters, plate heat exchangers and the like. The cold-rolled weather-resistant steel product provided by the invention has the advantages that the addition amount of alloy elements such as Mn, Cu, Cr, Ni and the like is small, and the performance is optimized through controlling the steelmaking, hot rolling and cold rolling processes, so that the production cost of the product is reduced.
Drawings
FIG. 1 is a metallographic structure diagram of a finished cold-rolled weathering steel product in example 1.
FIG. 2 is a metallographic structure diagram of a finished cold-rolled weathering steel product in example 2.
FIG. 3 is a metallographic structure diagram of a finished cold-rolled weathering steel product in example 3.
Detailed Description
The following are specific examples of the present invention and further describe the technical solutions of the present invention, but the scope of the present invention is not limited to these examples. All changes, modifications and equivalents that do not depart from the spirit of the invention are intended to be included within the scope thereof.
In each example, KR desulfurization, converter smelting and LF refining are carried out to obtain a furnace of molten steel with required chemical components, the molten steel is continuously cast to produce a plate blank, the thickness of the plate blank is 230mm, and the specific components of each example are shown in Table 1.
TABLE 1 Main chemical composition Table of molten steel in examples 1 to 3
In each example, the continuously cast slab is sent to a hot rolling heating furnace for heating, after the slab is taken out of the furnace, the slab is rolled for 1+5+ 7' passes through a rough rolling double-stand R1+ R2 rolling mill and a finish rolling seven-stand continuous rolling unit, the pass reduction rate is automatically calculated by a model, and finally the slab enters a coiler through laminar flow front-section cooling to produce a hot rolled coil, wherein specific hot rolling temperature parameters of each example are shown in Table 2.
TABLE 2 Hot Rolling temperature parameters in examples 1-3
| Temperature parameter/. degree.C | Temperature of heating | Temperature of finish rolling | Coiling temperature |
| The invention | 1240～1280 | 860～900 | 600～640 |
| Example 1 | 1270 | 878 | 630 |
| Example 2 | 1265 | 886 | 615 |
| Example 3 | 1268 | 880 | 623 |
In each embodiment, the hot rolled coil is naturally cooled, uncoiled again and passes through a laser welding machine of an acid rolling production line, the head and the tail of the front coil and the tail of the rear coil are welded and connected and then enter a pickling tank, continuous cold rolling is carried out on the front coil and the rear coil in a five-rack six-roller cold continuous rolling machine after pickling, the reduction rate of each rack is automatically calculated by a model, cold and hard coils are produced, and the specific acid rolling process parameters of each embodiment are shown in table.
TABLE 3 parameters of the acid rolling process in examples 1-3
In each example, the cold hard coil is uncoiled again and passes through a narrow lap welder of a continuous annealing production line, the head and the tail of the front coil and the tail of the rear coil are welded and connected, then cleaning, annealing, flattening and coiling are carried out, and finally a cold rolled finished coil is produced, wherein the specific continuous annealing process parameters of each example are shown in table 4.
TABLE 4 continuous annealing Process parameters in examples 1-3
| Process parameters | Soaking temperature/. degree.C | Overaging temperature/. degree C | Percent flat elongation/%) |
| The invention | 760～780 | 345～375 | 0.5～0.9 |
| Example 1 | 770 | 363 | 0.5 |
| Example 2 | 768 | 361 | 0.8 |
| Example 3 | 775 | 358 | 0.7 |
The final mechanical properties of the cold-rolled weathering steel products obtained in the examples are shown in Table 5. The metallographic structures of the finished cold-rolled weathering steel products of examples 1 to 3 are shown in fig. 1 to 3, respectively.
TABLE 5 Performance of the finished steel strip in examples 1-3
| Class of performance | Yield strength/MPa | Tensile strength/MPa | Elongation/percent |
| The invention | ≥310 | ≥450 | ≥28 |
| Example 1 | 369 | 494 | 34.0 |
| Example 2 | 384 | 500 | 31.5 |
| Example 3 | 354 | 474 | 33.5 |
The present invention is not limited to the above embodiments, and any structural changes made under the teaching of the present invention shall fall within the scope of the present invention, which is similar or similar to the technical solutions of the present invention.
The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.
Claims (10)
1. The production method of the cold-rolled weathering steel with yield strength of more than 310MPa is characterized in that the cold-rolled weathering steel comprises the following main chemical components in percentage by mass: c: 0.060% to 0.090%, Si: 0.25-0.45%, Mn: 0.20% -0.40%, P: 0.070% -0.090%, S: less than or equal to 0.020%, Als: 0.015% -0.050%, Ni: 0.10-0.25%, Cr: 0.30% -0.45%, Cu: 0.20 to 0.35 percent of Fe and the balance of inevitable impurities and residual elements;
the production method specifically comprises the following steps:
1) KR desulfurization; 2) smelting in a converter; 3) LF refining; 4) continuous casting; 5) hot rolling; 6) acid washing and cold rolling; 7) continuous annealing; 8) and (6) flattening and dividing the rolls.
2. The method for producing the cold-rolled weathering steel with yield strength of more than 310MPa according to claim 1, characterized in that the chemical composition of the cold-rolled weathering steel can also be added with one or more of the following minor alloying elements: nb: 0.015% -0.030%, V: 0.02% -0.08%, Ti: 0.02% -0.06%, Mo: less than or equal to 0.30 percent, Zr: less than or equal to 0.15 percent.
3. The method for producing cold-rolled weathering steel with yield strength of 310MPa or more according to claim 1, wherein S is less than or equal to 0.025% after KR desulfurization is completed in the step 1); the slag skimming rate requires that the bright surface is more than or equal to 80 percent.
4. The method for producing the cold-rolled weathering steel with yield strength of more than 310MPa according to claim 1, characterized in that the end temperature of the converter smelting converter in the step 2) is 1640-1690 ℃; adopting a sliding plate to block slag; the outlet temperature is 1570-1610 ℃.
5. The method for producing cold-rolled weather-resistant steel with yield strength of more than 310MPa according to claim 1, wherein calcium treatment is performed after LF refining LF treatment in the step 3); the soft blowing time is more than or equal to 10 min.
6. The method for producing the cold-rolled weathering steel with yield strength of more than 310MPa according to claim 1, characterized in that the continuous casting drawing speed of the step 4) is more than or equal to 0.9m/min, and casting is carried out at constant drawing speed; peeling the head blank and the tail blank; a continuous cast slab having a thickness of 230mm was obtained, and the slab quality was examined.
7. The method for producing cold-rolled weathering steel with yield strength of 310MPa or more according to claim 1, wherein the hot rolling of step 5) is a "1 +5+ 7" three-stage rolling process, specifically a rough rolling R1 rolling mill is a 1-pass rolling; the rough rolling R2 rolling mill is reversible rolling in 5 passes in a reciprocating way; the finishing mill group is 7-frame continuous rolling; the heating temperature of the plate blank is 1240-1280 ℃; the finish rolling temperature is 860-900 ℃; the coiling temperature is 600-640 ℃; laminar cooling adopts a front-section cooling process and a U-shaped coiling mode, and the lengths of a hot head and a hot tail are increased by 50m respectively at 40 ℃; and (3) welding the hot-rolled steel coil after uncoiling by using a laser welding machine, and performing butt welding on the front coil and the rear coil of the weather-resistant steel of the same steel type.
8. The method for producing cold-rolled weathering steel with yield strength of 310MPa or more according to claim 1, wherein the acid liquor temperature in the acid washing and cold-rolling of step 6) is 70 ℃ to 90 ℃; the acid liquor concentration of the final pickling tank is more than or equal to 140 g/L; the conductivity of the final rinsing water is less than or equal to 30 us/cm; adopting a five-stand rolling mill to carry out cold continuous rolling; the saponification value of the emulsion is more than or equal to 160 mgKOH/g; the total rolling reduction rate of the cold rolling is 55-75%, and the rolling reduction rate model of each machine frame automatically calculates.
9. The method for producing the cold-rolled weathering steel with yield strength of more than 310MPa according to claim 1, characterized in that the continuously annealed and acid-rolled steel coil in step 7) is uncoiled and then welded by a narrow lap welder in a way that the weathering steel is butt-welded with the front and back coils of the same steel type; the soaking temperature of the annealing furnace is 760 ℃ to 780 ℃; the overaging outlet temperature is 345-375 ℃.
10. The method for producing cold-rolled weathering steel with yield strength of 310MPa or more according to claim 1, wherein the flattening elongation of the flattening coil splitting in step 8) is 0.5% to 0.9%.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113637905A (en) * | 2021-07-28 | 2021-11-12 | 武汉钢铁有限公司 | Low-cost weathering steel for 310MPa cold-rolled automobile and preparation method thereof |
| CN114032467A (en) * | 2021-11-17 | 2022-02-11 | 攀钢集团攀枝花钢铁研究院有限公司 | Cold-rolled high-strength steel plate and preparation method thereof |
| CN115572904A (en) * | 2022-10-18 | 2023-01-06 | 山东钢铁集团日照有限公司 | Manufacturing method of high-weather-resistance cold-rolled steel strip with yield strength of 340MPa |
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| CN106893950A (en) * | 2017-01-13 | 2017-06-27 | 唐山钢铁集团有限责任公司 | Low yield strength ratio cold rolling weather resisting steel and its production method |
| CN110317936A (en) * | 2019-07-31 | 2019-10-11 | 马鞍山钢铁股份有限公司 | A kind of motor train compartment shell cold rolling weather resisting steel and preparation method thereof |
| CN110318006A (en) * | 2019-07-31 | 2019-10-11 | 马鞍山钢铁股份有限公司 | A kind of cold rolling weather resisting steel and preparation method thereof |
| CN111519082A (en) * | 2020-04-30 | 2020-08-11 | 张家港扬子江冷轧板有限公司 | Preparation method of ultrathin cold-rolled weather-resistant steel plate |
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2020
- 2020-09-11 CN CN202010950167.XA patent/CN112126855A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106893950A (en) * | 2017-01-13 | 2017-06-27 | 唐山钢铁集团有限责任公司 | Low yield strength ratio cold rolling weather resisting steel and its production method |
| CN110317936A (en) * | 2019-07-31 | 2019-10-11 | 马鞍山钢铁股份有限公司 | A kind of motor train compartment shell cold rolling weather resisting steel and preparation method thereof |
| CN110318006A (en) * | 2019-07-31 | 2019-10-11 | 马鞍山钢铁股份有限公司 | A kind of cold rolling weather resisting steel and preparation method thereof |
| CN111519082A (en) * | 2020-04-30 | 2020-08-11 | 张家港扬子江冷轧板有限公司 | Preparation method of ultrathin cold-rolled weather-resistant steel plate |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113637905A (en) * | 2021-07-28 | 2021-11-12 | 武汉钢铁有限公司 | Low-cost weathering steel for 310MPa cold-rolled automobile and preparation method thereof |
| CN114032467A (en) * | 2021-11-17 | 2022-02-11 | 攀钢集团攀枝花钢铁研究院有限公司 | Cold-rolled high-strength steel plate and preparation method thereof |
| CN115572904A (en) * | 2022-10-18 | 2023-01-06 | 山东钢铁集团日照有限公司 | Manufacturing method of high-weather-resistance cold-rolled steel strip with yield strength of 340MPa |
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Application publication date: 20201225 |