CN111349864B - High-strength high-plasticity annealed steel strip for pipe making and production method thereof - Google Patents
High-strength high-plasticity annealed steel strip for pipe making and production method thereof Download PDFInfo
- Publication number
- CN111349864B CN111349864B CN202010170391.7A CN202010170391A CN111349864B CN 111349864 B CN111349864 B CN 111349864B CN 202010170391 A CN202010170391 A CN 202010170391A CN 111349864 B CN111349864 B CN 111349864B
- Authority
- CN
- China
- Prior art keywords
- equal
- less
- steel strip
- rolling
- annealing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- 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
- C21D1/26—Methods of annealing
-
- 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
- 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
-
- 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
- C21D8/0242—Flattening; Dressing; Flexing
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- 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
-
- 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
- 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
Landscapes
- 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 invention discloses an annealed steel strip for high-strength high-plasticity pipe making and a production method thereof, wherein the steel strip comprises the following chemical components in percentage by mass: c: 0.06-0.08%, Si is less than or equal to 0.03%, Mn: 0.35-0.50%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, Als: 0.020-0.050%, N is less than or equal to 0.0045%, O is less than or equal to 0.0025%, and the balance is Fe and inevitable impurities; the production method comprises the working procedures of steel making, continuous casting, heating, hot rolling, cold rolling, annealing and leveling. The invention adopts the low-carbon low-manganese component design, and the tensile strength of the obtained steel strip is 370-400 MPa, the yield strength is more than or equal to 260MPa, and the elongation A is regulated and controlled through a reasonable process80mmNot less than 28.0%, hardness HRB: 60-68 and excellent mechanical property.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to an annealed steel strip for high-strength and high-plasticity pipe making and a production method thereof.
Background
The parts such as bicycle handlebars, frames, car headrest supports and the like are mostly manufactured by using annealed steel strip welded pipes, and the manufacturing process needs bending, expanding and other processes, so that the steel is required to have good formability. Because the surface of the steel pipe needs to be polished before and after forming, if the steel belt has the problems of subcutaneous inclusion, skin tilting, overlapping and rolling and the like, the surface quality of the product is seriously affected, and the yield is reduced. Meanwhile, in consideration of the specific application condition in the life cycle of the product, the applied steel has certain strength and hardness. However, most of steel materials used in the existing method are SPCC, Q195 and the like, the yield strength is lower than 260MPa, the tensile strength is lower than 350MPa, the elongation is lower than 28%, and the problems of insufficient strength, forming fracture and the like easily occur after the materials are processed into steel pipes. Meanwhile, a conventional production flow is adopted in the production process of steel, RH refining treatment is not carried out, the cleanliness of the interior of the steel is poor, a large number of non-metallic inclusions exist, the surface of the steel is prone to suffering from poor defects such as warping and slag inclusion, and a large number of waste times are brought due to surface problems during subsequent pipe making, drawing and polishing, so that great cost loss is caused.
In consideration of the above problems, it is necessary to manufacture a steel strip for welded pipes having high cleanliness, good strength and good plasticity by reasonable composition design, process flow and parameter control.
Disclosure of Invention
The technical problem to be solved by the invention is to provide an annealed steel strip for high-strength and high-plasticity tube making; the invention also provides a production method of the high-strength high-plasticity annealed steel strip for pipe making.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the high-strength high-plasticity annealed steel strip for pipe making comprises the following chemical components in percentage by mass: c: 0.06-0.08%, Si is less than or equal to 0.03%, Mn: 0.35-0.50%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, Als: 0.020-0.050%, N less than or equal to 0.0045%, O less than or equal to 0.0025%, and the balance of Fe and inevitable impurities.
The thickness of the steel strip is 1.5-2.5 mm.
The tensile strength of the steel strip is 370-400 MPa, the yield strength is more than or equal to 260MPa, the elongation A80mm is more than or equal to 28.0%, and the hardness HRB: 60-68.
The invention also provides a production method of the high-strength high-plasticity annealed steel strip for pipe making, which comprises the working procedures of steel making, continuous casting, heating, hot rolling, cold rolling, annealing and flattening; the steelmaking process comprises molten iron desulphurization, converter smelting, LF refining and RH vacuum treatment, and the tapped molten steel comprises the following chemical components in percentage by mass: c: 0.06-0.08%, Si is less than or equal to 0.03%, Mn: 0.35-0.50%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, Als: 0.020-0.050%, N is less than or equal to 0.0045%, O is less than or equal to 0.0025%, and the balance is Fe and inevitable impurities; in the converter smelting process, the converter directly taps steel after carbon drawing and bottom blowing, and the tapping time is more than or equal to 3 min; in the RH vacuum treatment process, the pure degassing time is more than or equal to 8min, and the molten steel standing time is more than or equal to 20 min; the continuous casting process is controlled by a constant drawing speed, the speed is 1.2-1.7 m/min, the width of a continuous casting blank is 900-1450 mm, the thickness of the continuous casting blank is 180-220 mm, corner cutting is carried out after the casting blank is cooled, and the two right-angle sides of each corner cutting are 10-30 mm long.
In the heating process, the temperature of the soaking section is 1250-1300 ℃.
In the hot rolling process, the rough rolling adopts a reversible rolling mill to carry out 5-pass rolling in a reciprocating way, high-pressure water descaling is carried out before each pass of rolling, and the pressure of the descaling water is more than or equal to 20 MPa; the finishing temperature is 845-875 ℃, and the coiling temperature is 540-580 ℃.
The cold rolling process adopts five-stand acid continuous rolling, and the total rolling reduction is 60-72%.
In the annealing process, the speed of a steel belt furnace zone is 70-100 m/min, the temperature of an annealing heating section is 560-580 ℃, and the temperature of an annealing soaking section is 690-710 ℃.
In the leveling process, the elongation of the leveling machine is 2.3-2.7%.
On the basis of low-carbon components, the proper manganese element is added, so that the material has enough strength and good formability and weldability. According to the invention, through a preferable process route, an RH refining treatment process is added on the basis of an LF refining process, so that the content of harmful elements such as P, S, N, O is reduced, the purity of molten steel is improved, the process parameters of a continuous casting machine are further controlled, the quality of a casting blank is improved, and the slag inclusion defect is avoided. The hot rolling process controls the rolling process parameters to obtain fine and uniform ferrite and pearlite structures, and provides a foundation for controlling subsequent annealing structures. The annealing process is based on hot rolling structure, and preferably selects proper furnace zone speed, annealing temperature schedule and flat elongation parameters, thereby obtaining the cold-rolled annealed steel strip with good strength and plasticity.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: 1. the low-carbon low-manganese alloy is adopted, and the alloy cost is reduced by adopting the component design without adding alloy elements; 2. by adopting an LF + RH duplex steelmaking process and adjusting the degassing time and the standing treatment time of the molten steel, the total oxygen and nitrogen content in the molten steel can be effectively controlled, the cleanliness of the molten steel is improved, and the impurity proportion of a product is reduced; 3. cutting corners of the continuous casting blank to eliminate the defects of the corners of the casting blank and avoid the edge of the steel strip from warping due to cracks and bubbles at the corners of the casting blank; 4. the strength and hardness of the product are improved by adopting lower finish rolling temperature, coiling temperature, annealing soaking section temperature and higher elongation of the temper mill, and the product performance is ensured.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Examples 1 to 10: an annealed steel strip for high-strength high-plasticity tube production and a production method thereof are described below.
1. The steel strip comprises the following chemical components: the chemical composition in weight percent of the steel strip of each example is shown in table 1.
Table 1: chemical composition (wt%) of steel strip of each example
The balance in table 1 is iron and unavoidable impurities.
2. The production method comprises the following steps: the method comprises the working procedures of steel making, continuous casting, heating, hot rolling, cold rolling, annealing and leveling, and the process of each working procedure is as follows:
(1) a steel making process: the method comprises the steps of molten iron desulphurization, converter smelting, LF refining and RH vacuum treatment. In the converter smelting process, directly tapping after carbon drawing and bottom blowing of a converter, wherein the tapping time is more than or equal to 3 min; adjusting the components by LF refining, then performing RH vacuum treatment, wherein the pure degassing time is more than or equal to 8min, and the molten steel is kept stand for more than or equal to 20min after RH treatment;
(2) and (3) continuous casting process: the method comprises the following steps of (1) controlling the drawing speed at a constant speed of 1.2-1.7 m/min, controlling the width of a continuous casting blank to be 900-1450 mm and the thickness of the continuous casting blank to be 180-220 mm, cooling the casting blank, and then performing corner cutting treatment, wherein two right-angle edges of a corner are respectively 10-30 mm long;
(3) a heating procedure: heating the plate blank in a stepping heating furnace, and controlling the temperature of a soaking section of the heating furnace to be 1250-1300 ℃;
(4) a hot rolling procedure: the method comprises the steps of rough rolling, finish rolling, laminar cooling and coiling, wherein the rough rolling adopts a reversing mill to carry out reciprocating 5-pass rolling, high-pressure water descaling is carried out before each pass of rolling, and the descaling water pressure is more than or equal to 20 MPa; the final rolling temperature is 845-875 ℃, and after final rolling, the steel is cooled to 540-580 ℃ by laminar flow to be coiled;
(5) a cold rolling procedure: adopting five-stand acid continuous rolling for rolling, wherein the total rolling reduction is 60-72%;
(6) and (3) annealing: the speed of a steel strip furnace zone is 70-100 m/min, the heating of the steel strip is divided into a preheating section, a heating section and a soaking section, the steel strip is preheated at low temperature after entering the furnace, the temperature of the heating section is controlled to be 560-580 ℃, and the temperature of the soaking section is controlled to be 690-710 ℃;
(7) leveling: the leveling elongation is controlled to be 2.3-2.7%.
The process parameters in the production process of each example are shown in tables 2 and 3.
Table 2: process parameters for steelmaking and slab heating of each example
Table 3: process parameters for Hot to Cold roll temper rolling for each example
3. Mechanical properties: the mechanical properties of the steel strips obtained in the examples are shown in Table 4.
Table 4: mechanical Properties of the Steel strips obtained in the examples
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
Claims (7)
1. The high-strength high-plasticity annealed steel strip for pipe making is characterized by comprising the following chemical components in percentage by mass: c: 0.06-0.08%, Si is less than or equal to 0.03%, Mn: 0.35-0.50%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, Als: 0.020-0.050%, N is less than or equal to 0.0045%, O is less than or equal to 0.0025%, and the balance is Fe and inevitable impurities; the tensile strength of the steel strip is 370-400 MPa, the yield strength is more than or equal to 260MPa, and the elongation rate A is80mmNot less than 28.0%, hardness HRB: 60-68;
the steel strip is produced by the following method: comprises the working procedures of steel making, continuous casting, heating, hot rolling, cold rolling, annealing and flattening; the steelmaking process comprises molten iron desulphurization, converter smelting, LF refining and RH vacuum treatment, and the tapped molten steel comprises the following chemical components in percentage by mass: c: 0.06-0.08%, Si is less than or equal to 0.03%, Mn: 0.35-0.50%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, Als: 0.020-0.050%, N is less than or equal to 0.0045%, O is less than or equal to 0.0025%, and the balance is Fe and inevitable impurities; in the converter smelting process, the converter directly taps steel after carbon drawing and bottom blowing, and the tapping time is more than or equal to 3 min; in the RH vacuum treatment process, the pure degassing time is more than or equal to 8min, and the molten steel standing time is more than or equal to 20 min; in the continuous casting process, constant drawing speed control is adopted, the speed is 1.2-1.7 m/min, the width of a continuous casting billet is 900-1450 mm, the thickness of the continuous casting billet is 180-220 mm, corner cutting treatment is carried out after the casting billet is cooled, and the two right-angle sides of each corner cutting are 10-30 mm long; in the annealing process, the speed of a steel belt furnace zone is 70-100 m/min, the temperature of an annealing heating section is 560-580 ℃, and the temperature of an annealing soaking section is 690-710 ℃.
2. The annealed steel strip for high-strength high-plasticity tube production according to claim 1, wherein the thickness of the steel strip is 1.5 to 2.5 mm.
3. The method for producing an annealed steel strip for high-strength high-plasticity tube-making according to claim 1 or 2, wherein the production method comprises the steps of steelmaking, continuous casting, heating, hot rolling, cold rolling, annealing and leveling;
the steelmaking process comprises molten iron desulphurization, converter smelting, LF refining and RH vacuum treatment, and the tapped molten steel comprises the following chemical components in percentage by mass: c: 0.06-0.08%, Si is less than or equal to 0.03%, Mn: 0.35-0.50%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, Als: 0.020-0.050%, N is less than or equal to 0.0045%, O is less than or equal to 0.0025%, and the balance is Fe and inevitable impurities; in the converter smelting process, the converter directly taps steel after carbon drawing and bottom blowing, and the tapping time is more than or equal to 3 min; in the RH vacuum treatment process, the pure degassing time is more than or equal to 8min, and the molten steel standing time is more than or equal to 20 min;
in the continuous casting process, constant drawing speed control is adopted, the speed is 1.2-1.7 m/min, the width of a continuous casting billet is 900-1450 mm, the thickness of the continuous casting billet is 180-220 mm, corner cutting treatment is carried out after the casting billet is cooled, and the two right-angle sides of each corner cutting are 10-30 mm long;
in the annealing process, the speed of a steel belt furnace zone is 70-100 m/min, the temperature of an annealing heating section is 560-580 ℃, and the temperature of an annealing soaking section is 690-710 ℃.
4. The method for producing an annealed steel strip for high-strength high-plasticity tube-making according to claim 3, wherein the heating step has a soaking zone temperature of 1250 to 1300 ℃.
5. The method for producing the annealed steel strip for high-strength high-plasticity tube-making according to claim 3, wherein in the hot rolling step, the rough rolling is performed by 5-pass reciprocating rolling by a reversing rolling mill, and high-pressure water descaling is performed before each pass of rolling, and the descaling water pressure is more than or equal to 20 MPa; the finishing temperature is 845-875 ℃, and the coiling temperature is 540-580 ℃.
6. The method for producing the annealed steel strip for high-strength high-plasticity tube-making according to any one of claims 3 to 5, wherein the cold rolling step is a five-stand acid continuous rolling step, and the total rolling reduction is 60 to 72%.
7. The method for producing an annealed steel strip for high-strength high-plasticity tube-making according to any one of claims 3 to 5, wherein in the flattening step, the temper mill elongation is 2.3 to 2.7%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010170391.7A CN111349864B (en) | 2020-03-12 | 2020-03-12 | High-strength high-plasticity annealed steel strip for pipe making and production method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010170391.7A CN111349864B (en) | 2020-03-12 | 2020-03-12 | High-strength high-plasticity annealed steel strip for pipe making and production method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111349864A CN111349864A (en) | 2020-06-30 |
| CN111349864B true CN111349864B (en) | 2021-09-07 |
Family
ID=71192770
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010170391.7A Active CN111349864B (en) | 2020-03-12 | 2020-03-12 | High-strength high-plasticity annealed steel strip for pipe making and production method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111349864B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112725692A (en) * | 2020-12-17 | 2021-04-30 | 包头钢铁（集团）有限责任公司 | Preparation method of steel strip for nitriding treatment |
| CN115029622B (en) * | 2022-04-29 | 2023-05-23 | 武汉钢铁有限公司 | High-surface-quality hot-rolled dual-phase steel and production process thereof |
| CN115747614A (en) * | 2022-11-17 | 2023-03-07 | 唐山瑞丰钢铁（集团）有限公司 | Production method of steel for tinned substrate |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101914725B (en) * | 2010-09-02 | 2013-03-20 | 唐山国丰钢铁有限公司 | Low-carbon ultra-deep punching cold-rolling steel sheet and production method thereof |
| JP6019719B2 (en) * | 2012-05-02 | 2016-11-02 | Ｊｆｅスチール株式会社 | Manufacturing method of high strength and high ductility steel sheet |
| CN104928576A (en) * | 2015-05-13 | 2015-09-23 | 唐山钢铁集团有限责任公司 | Production method of 260-330MPa low-alloy high-strength steel |
| CN109207696B (en) * | 2018-08-27 | 2020-09-01 | 唐山钢铁集团有限责任公司 | Production method of ultra-deep drawing cold-rolled annealed low-carbon steel strip with low earing rate |
| CN109136444A (en) * | 2018-08-30 | 2019-01-04 | 唐山钢铁集团有限责任公司 | Quickly, the new energy car battery shell steel and production method of punch process is thinned |
| CN110724881B (en) * | 2019-10-13 | 2021-07-09 | 唐山钢铁集团高强汽车板有限公司 | Production method for 600MPa peritectic high-aluminum TRIP steel |
-
2020
- 2020-03-12 CN CN202010170391.7A patent/CN111349864B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN111349864A (en) | 2020-06-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111349864B (en) | High-strength high-plasticity annealed steel strip for pipe making and production method thereof | |
| CN111455282B (en) | Quenching distribution steel with tensile strength more than or equal to 1500MPa produced by adopting short process and method | |
| CN111440987B (en) | Quenching distribution steel with tensile strength of more than or equal to 980MPa produced by adopting short process and method | |
| CN106636907A (en) | Thin gauge carriage body steel belt with yield strength of 600MPa, and manufacturing method of thin gauge carriage body steel belt | |
| CN110714165B (en) | Cold-rolled sheet for 320 MPa-level household appliance panel and production method thereof | |
| CN113025909A (en) | Hot-rolled pickled plate for refrigerator compressor shell and production method thereof | |
| CN111690871B (en) | Hot-rolled steel plate for cold-rolled electro-galvanized steel plate and manufacturing method | |
| CN105734403A (en) | Hot-rolled coil for saw blade steel and production method of hot-rolled coil | |
| CN111926252B (en) | Hot-rolled pickled steel plate for deep drawing and production method thereof | |
| CN112795731A (en) | Cold-rolled steel plate for lampshade and production method thereof | |
| CN110904392A (en) | Ultra-low carbon anti-pressure thin-specification cold-rolled sheet for battery shell and production method thereof | |
| CN114645188A (en) | Method for efficiently producing hot-rolled steel strip for 2-4 mm extreme thin-specification high-quality stirring tank with tensile strength of 650MPa | |
| CN114032468A (en) | Production method of low-cost Q345E structural steel plate | |
| CN111549273B (en) | Method for efficiently producing high-quality 590 MPa-grade cold-rolled dual-phase steel | |
| CN113061809A (en) | 380 MPa-level hot rolled steel strip for 2-4mm automobile structure and production method thereof | |
| CN113549808A (en) | Production method of rare earth microalloyed Q355B low-alloy high-strength structural steel | |
| CN113061797A (en) | Improved production method of QStE420TM hot-rolled steel plate | |
| CN113802054A (en) | Hot rolled steel plate with yield strength of 420MPa and manufacturing method thereof | |
| CN112226681A (en) | Low-cost high-strength galvanized sheet SGC570 for structure and production method thereof | |
| CN107829026B (en) | thin-specification 980 MPa-grade dual-phase steel and processing method thereof | |
| CN114000068B (en) | Low-nitrogen ultrahigh-strength hot-rolled steel strip with thickness of 4-10mm and production method thereof | |
| CN110938771A (en) | Hot-rolled steel plate for wheel with tensile strength of 630MPa and manufacturing method thereof | |
| CN115386782A (en) | Low-cost high-strength galvanized sheet and manufacturing process of sandwich board thereof | |
| CN112708827B (en) | Ultrathin steel strip for battery case and electronic basic element and manufacturing method thereof | |
| CN115478208A (en) | Thin-specification high-formability stamping steel based on CSP production line and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |