CN111922078A - Production method of high-strength thick steel plate with yield strength of more than or equal to 370MPa - Google Patents
Production method of high-strength thick steel plate with yield strength of more than or equal to 370MPa Download PDFInfo
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- CN111922078A CN111922078A CN202010804042.6A CN202010804042A CN111922078A CN 111922078 A CN111922078 A CN 111922078A CN 202010804042 A CN202010804042 A CN 202010804042A CN 111922078 A CN111922078 A CN 111922078A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
- B21B37/44—Control of flatness or profile during rolling of strip, sheets or plates using heating, lubricating or water-spray cooling of the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/004—Heating the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
- B21B2001/386—Plates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2201/00—Special rolling modes
- B21B2201/06—Thermomechanical rolling
Abstract
The invention discloses a production method of a high-strength thick steel plate with yield strength of more than or equal to 370MPa, which ensures the uniformity of heating temperature of a plate blank raw material and reduces the interference of temperature on the bad plate shape by controlling a heating process; by controlling the rolling process, the descaling water of the machine body is used once when the rolling is started at the two rolling stages, so that the temperature difference between the upper surface and the lower surface of the rolled piece is formed, the lower surface of the rolled piece is more easily deformed in the subsequent rolling steel biting process, two ends of the formed rolled piece slightly upwarp, the influence on the stability of a roller system caused by the impact of a roller way in the rolling process is avoided, and the transverse small wave bad plate shape of the rolled piece generated by rolling is eliminated; the method realizes the purpose of improving the rolled plate shape of the high-strength thick steel plate by the controlled rolling process design on the basis of not additionally arranging related auxiliary straightening equipment, and the obtained thick steel plate has good plate shape, thereby greatly reducing the enterprise cost and having good economic benefit and social benefit.
Description
Technical Field
The invention relates to the technical field of steel materials, in particular to a production method of a high-strength thick steel plate with yield strength of more than or equal to 370 MPa.
Background
Generally, a steel plate with the specification of 40mm or more is called a thick plate, and is comprehensively influenced by the temperature of a rolled piece, a roll gap, screw-down, characteristics of a main motor and the like when the thick plate with the specification of 370MPa or more is produced, a head is formed after the rolled piece is bitten, the head frequently impacts an outlet roller way in the rolling process, and further influences the stable state of a roller system, and correspondingly causes the steel plate to generate transverse small waves with the cycle length of 300 plus 600mm (see figure 1), in the figure, a0 is the small wave interval of the thick steel plate (300 plus 600mm), b0 is the unevenness of the thick steel plate (5-8mm), and the requirements of b0 is less than or equal to 3mm and a0 is less than or equal to 1000mm for. After the phenomenon occurs to the thick steel plate, the steel plate can not be straightened on line due to low temperature after being cooled rapidly, and the unevenness seriously exceeds the standard. On a wide and thick plate production line without a cold straightening machine and a flattening machine, the poor plate shape of the small wave formed by original rolling can be flattened only after heat treatment and high-temperature normalizing. Before the method is implemented, the rolled high-strength thick plate generally has poor plate shape, the plate shape needs to be restored by heat treatment and high-temperature normalizing, the delivery period of the steel plate is seriously restricted, the cost is increased, the unqualified performance caused by high-temperature saving can also cause the steel plate to be shipped and re-rolled, and huge waste is caused. Meets the national standard and can meet the requirement of height unevenness of 3mm/1000 mm.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method solves the problems that the rolled piece is in a transverse small wave poor plate shape caused by the fact that a rolled piece impacts a roller way due to tapping and the roller system is in an unstable state in the rolling process, delivery requirements cannot be met, and huge waste is caused.
The invention relates to a production method of a high-strength thick steel plate with yield strength of more than or equal to 370MPa, which comprises the following steps:
(1) preparation of slab raw material and preheating of heating furnace
Producing a steel plate with yield strength of more than or equal to 370MPa, finished plate thickness H of 40-100mm and width of 4200mm, and correspondingly preparing initial thickness H0The continuous casting plate blank with the cross section of 200 plus 300mm is continuously heated in a stepping mode by a heating furnace;
(2) heating the slab in the furnace
The prepared plate blank raw material is put into a heating furnace and then heated according to the heating rate of 8-12min/cm, the tapping temperature is 1200 +/-30 ℃, and the soaking time of the plate blank is more than or equal to 0.1 XH0+5min, said H0The thickness of the initial raw material plate blank;
(3) slab hot rolling
The two-stage controlled rolling process is adopted after the heated plate blank is discharged from the furnace, and the specific conditions are as follows:
directly rolling the plate blank after being discharged from a furnace and descaled, wherein the rolling starting temperature of one stage is more than or equal to 1080 ℃, and widening passes are controlled according to the widening ratio according to the dimensional requirements of the blank and the rolled steel plate, and the specific conditions are as follows:
A. the broadening ratio is less than or equal to 1.2, and the broadening pass is less than or equal to 3 passes;
b.1.2 or more and the broadening ratio is less than or equal to 1.6, and the broadening pass is less than or equal to 4 passes;
C. the broadening ratio is more than or equal to 1.6, and the broadening pass is less than or equal to 5 passes;
the finishing temperature of the first stage is more than or equal to 1030 ℃, and the thickness H of the rolled intermediate billet is controlled1The following were used:
A. when the thickness H of the finished board is less than or equal to 60mm, H is adopted1≥2h-10mm；
B. When the thickness H of the finished board is more than 60mm, H is adopted1≥h+50mm；
The spreading width ratio is equal to the rolling target width W ÷ slab width W;
secondly, in the second-stage initial rolling, the descaling water of the machine body is used once, and except the last 3 rolling passes, the rolling pass reduction rate of the rest two-stage rolling passes is required to be more than or equal to 10 percent; and (2) controlling the absolute reduction of a single pass to be more than 0.1 multiplied by h (when the reduction setting is smaller, the rolled piece cannot warp and is set too large, the convexity control of the rolled piece can cause the thickness to deviate from the target, a serious end part tilting is easy to form, the subsequent straightening is not facilitated), and controlling the reduction of the single pass to be between 9 and 18 percent (the reduction of the pass is equal to the reduction of the pass delta h/the thickness of the last pass h)0) Setting the biting steel speed to be more than or equal to V and 1.35m/s0≥1.15m/s；
(4) Finishing: after flaw detection (if necessary, execution according to delivery standard requirements), heat treatment (if necessary, execution according to delivery state requirements) and shearing, the manufactured steel plate is placed on a rack to carry out plate turning inspection, steel plate unevenness measurement, appearance, dimension, surface quality inspection and the like, and the finished steel plate can be off-line and put in storage after being qualified.
In the technical scheme of the invention, the heating process is used for ensuring the uniformity of the heating temperature of the plate blank raw material, and reducing the interference of the temperature on the bad plate shape while ensuring the performance; in the first rolling stage, widening passes are calculated according to widening ratios, downward tapping at the plate end caused by too small pass reduction is mainly avoided, uniformity of transverse and longitudinal properties of the steel plate is guaranteed, and mechanical property requirements are met; the descaling water is used for one time when the rolling is started in the two-stage rolling process, so that secondary oxide scales can be removed, a certain temperature difference between the upper surface and the lower surface of a rolled piece is formed, namely the temperature of the lower surface is slightly higher than that of the upper surface, and the lower surface of the rolled piece is easy to deform under the same condition in the subsequent rolling and steel biting process, so that two ends of the rolled piece are slightly tilted; setting the thickness H of the intermediate blank to be heated1Not less than 2H (finished product thickness) -10mm or H1H +50mm, which is to ensure the two-stage accumulated reduction rate and provide a precondition for controlling the large reduction at the last three times; setting last three times of biting-in speed V0Between 1.15m/s and 1.35m/s, under high pressureEnsuring the stable gripping condition of a rolled piece; the final 3 passes are set within a certain reduction rate range, and the large reduction process is adopted, so that the micro-warping head of the rolled piece can be generated in the rolling process, the impact on a roller way in the rolling process is avoided, the stability of a roller system is influenced, the poor plate shape of the transverse small wave of the rolled piece generated in the rolling process is eliminated, the micro-warping head generated in the rolling process can be directly leveled by a thermal straightener, and the unevenness of the rolled product is ensured to meet the requirements of users.
The method realizes the purpose of improving the rolled plate shape of the high-strength thick steel plate by the controlled rolling process design on the basis of not additionally arranging relevant auxiliary straightening equipment (such as cold straightening, flattening machine and heat treatment high-temperature plate shape saving and the like), and the obtained thick steel plate has good plate shape, greatly reduces the enterprise cost and has good economic benefit and social benefit.
Drawings
FIG. 1 is a schematic view showing an effect of enlarging unevenness of a thick gauge steel plate rolled by a conventional method;
FIG. 2 is a schematic view showing the enlarged effect of the invention after rolling of a thick gauge steel sheet.
In the figure, 1-steel plate, 2-unevenness measuring scale, a 0-small space (300-.
Detailed Description
In order to better explain the technical solution of the present invention, the technical solution of the present invention is further described below with reference to specific examples, which are only exemplary to illustrate the technical solution of the present invention and do not limit the present invention in any way.
Example 1
Taking the production of Q420GJDZ25 steel as an example, the specification of the finished steel plate is 50mm multiplied by 2700mm multiplied by Lmm, and the specific production process is as follows:
(1) adopting a plate blank with the specification of 250mm multiplied by 2000mm multiplied by 4040mm, and heating by adopting a stepping heating furnace;
(2) heating the plate blank in a stepping heating furnace, setting the discharging target temperature at 1200 ℃, and soaking for more than or equal to 30 min; the actual tapping temperature is 1202 ℃, and the soaking time is 35 min;
(3) the two-stage controlled rolling process is adopted after the heated plate blank is discharged from the furnace, and the specific conditions are as follows:
directly rolling the plate blank after being discharged from a furnace and descaled, wherein the rolling starting temperature of one stage is more than or equal to 1080 ℃, the actual measurement is 1177 ℃, according to the dimensional requirements of the blank and the rolled steel plate, widening passes are controlled according to widening ratios, and the widening passes of one stage are 3 passes (2 nd, 3 rd and 4 th passes) through calculation; controlling the rolling to be 2-7 times in the first stage, wherein the final rolling temperature in the first stage is more than or equal to 1030 ℃, and actually 1132 ℃; the thickness of the controlled rolling intermediate billet is 90 mm;
secondly, rolling is controlled in two stages, the descaling water of the machine body is used once during initial rolling, the final three-stage rolling reduction is ensured to be more than 0.1 multiplied by h, and the single-stage rolling reduction is controlled to be 9-18%; the actual final three-pass reduction is more than 7mm, the single-pass reduction is between 12% and 14%, and the bite speed is given as 1.3 m/s; the specific rolling schedule is shown in table 1; after rolling in the step, the produced steel plate is inspected and measured by a turning plate, and the unevenness is 1mm/1000mm, which meets the national standard requirement;
(4) and (4) finishing and warehousing: after flaw detection, heat treatment and shearing are carried out on the manufactured steel plate, the steel plate is turned over on the upper rack to carry out steel plate unevenness detection, appearance, dimension, surface quality detection and the like, and after the steel plate is qualified, the steel plate can be off-line and warehoused, the steel plate produced in the embodiment is turned over to carry out plate detection and measurement, the unevenness is 1mm/1000mm, and the national standard requirement is met.
Table 1 procedure for rolling steel sheet of example 1
Example 2
In this embodiment, the production of Q690D steel is taken as an example, the specification of the finished steel plate is 80mm × 2250mm × Lmm, and the specific production process is as follows:
(1) adopting a plate blank with the specification of 300mm multiplied by 2000mm multiplied by 4120mm and a stepping heating furnace; the specific process is as follows:
(2) heating the plate blank in a stepping heating furnace, setting the discharging target temperature at 1200 ℃, and soaking for more than or equal to 35 min; the actual tapping temperature is 1198 ℃, and the soaking time is 38 min;
(3) the two-stage controlled rolling process is adopted after the heated plate blank is discharged from the furnace, and the specific conditions are as follows:
directly rolling the plate blank after being discharged from a furnace and descaled, wherein the rolling starting temperature of one stage is more than or equal to 1080 ℃, the actual measurement is 1143 ℃, the broadening pass is controlled according to the broadening ratio according to the dimensional requirements of the blank and the rolled steel plate, and the broadening pass of one stage is 2 passes (2 nd and 3 rd passes) through calculation; controlling rolling to 2-7 times in the first stage, wherein a rolling mill adopts a controlled rolling process, the final rolling temperature in the first stage is more than or equal to 1030 ℃, and actually 1129 ℃; the thickness of the controlled rolling intermediate billet is 130 mm;
rolling is controlled in two stages, rolling is started for descaling once, the rolling reduction of the last three times is ensured to be more than 0.1 multiplied by h, and the single-pass rolling reduction is controlled to be 9-18%; the actual final three-pass reduction is more than 9mm, the single-pass reduction is between 10% and 13%, and the bite speed is given as 1.2 m/s; the specific rolling schedule is shown in Table 2; after rolling in the step, the produced steel plate is inspected and measured by a turning plate, and the unevenness is 1.5mm/1000mm, which meets the national standard requirement;
(4) and (4) finishing and warehousing: after flaw detection, heat treatment and shearing are carried out on the manufactured steel plate, the steel plate is turned over on the upper rack to carry out steel plate unevenness detection, appearance, dimension, surface quality detection and the like, and after the steel plate is qualified, the steel plate can be off-line and warehoused, and the unevenness of the steel plate produced in the embodiment is 1.5mm/1000mm through turning plate detection and measurement, so that the national standard requirement is met.
Table 2 steel sheet rolling schedule of example 2
Example 3
Taking the production of HG785D steel as an example, the specification of the finished steel plate is 40mm × 2550mm × Lmm, and the specific production process is as follows:
(1) adopting a plate blank with the specification of 250mm multiplied by 1800mm multiplied by 2950mm, and heating by adopting a stepping heating furnace;
(2) heating the plate blank in a stepping heating furnace, setting the discharging target temperature to 1185 ℃, and soaking for more than or equal to 30 min; the actual tapping temperature is 1183 ℃, and the soaking time is 33 min;
(3) the two-stage controlled rolling process is adopted after the heated plate blank is discharged from the furnace, and the specific conditions are as follows:
directly rolling the plate blank after being discharged from a furnace and descaled, wherein the rolling starting temperature of one stage is more than or equal to 1080 ℃, the actual measurement is 1144 ℃, widening passes are controlled according to the widening ratio according to the dimensional requirements of the blank and the rolled steel plate, and the widening passes of one stage are 3 passes (3 rd, 4 th and 5 th passes) through calculation; controlling rolling to 2-8 times in the first stage, wherein the final rolling temperature in the first stage is more than or equal to 1030 ℃, and actually 1128 ℃; the thickness of the controlled rolling intermediate billet is 80 mm;
secondly, rolling is controlled in two stages, the descaling water of the machine body is used once during initial rolling, the final three-stage rolling reduction is ensured to be more than 0.1 multiplied by h, and the single-stage rolling reduction is controlled to be 9-18%; the actual final three-pass reduction is more than 4.5mm, the single-pass reduction rate is between 10% and 14%, and the bite speed is given as 1.35 m/s; the specific rolling schedule is shown in Table 3; after rolling in the step, the produced steel plate is inspected and measured by a turning plate, and the unevenness is 1mm/1000mm, which meets the national standard requirement;
(4) and (4) finishing and warehousing: after flaw detection, heat treatment and shearing are carried out on the manufactured steel plate, the steel plate is turned over on the upper rack to carry out steel plate unevenness detection, appearance, dimension, surface quality detection and the like, and after the steel plate is qualified, the steel plate can be off-line and warehoused, the steel plate produced in the embodiment is turned over to carry out plate detection and measurement, the unevenness is 1mm/1000mm, and the national standard requirement is met.
Table 3 steel sheet rolling schedule of example 3
Example 4
In this embodiment, the production of Q420GJCZ35 steel is taken as an example, the specification of the finished steel plate is 100mm × 2100mm × Lmm, and the specific production process is as follows:
(1) adopting a plate blank with the specification of 300mm multiplied by 2000mm multiplied by 3980mm and a stepping heating furnace; the specific process is as follows:
(2) heating the plate blank in a stepping heating furnace, setting the discharging target temperature to 1210 ℃, and soaking for more than or equal to 35 min; the actual tapping temperature is 1211 ℃, and the soaking time is 45 min;
(3) the two-stage controlled rolling process is adopted after the heated plate blank is discharged from the furnace, and the specific conditions are as follows:
directly rolling the plate blank after being discharged from a furnace and descaled, wherein the rolling starting temperature of a first stage is more than or equal to 1080 ℃, the actual measurement is 1119 ℃, widening passes are controlled according to the widening ratio according to the dimensional requirements of the blank and the rolled steel plate, and the widening passes of the first stage are 1 pass (2 nd pass) through calculation; controlling rolling to 2-6 times in the first stage, wherein the rolling mill adopts a controlled rolling process, the final rolling temperature in the first stage is more than or equal to 1030 ℃, and the actual temperature is 1104 ℃; the thickness of the controlled rolling intermediate billet is 150 mm;
rolling is controlled in two stages, rolling is started for descaling once, the rolling reduction of the last three times is ensured to be more than 0.1 multiplied by h, and the single-pass rolling reduction is controlled to be 9-18%; the actual final three-pass reduction is more than 10mm, the single-pass reduction is between 9% and 10%, and the bite speed is given as 1.2 m/s; the specific rolling schedule is shown in Table 2; after rolling in the step, the produced steel plate is inspected and measured by a turning plate, and the unevenness is 2mm/1000mm, which meets the national standard requirement;
(4) and (4) finishing and warehousing: after flaw detection, heat treatment and shearing are carried out on the manufactured steel plate, the steel plate is turned over on the upper rack to carry out steel plate unevenness detection, appearance, dimension, surface quality detection and the like, and after the steel plate is qualified, the steel plate can be off-line and warehoused, the steel plate produced in the embodiment is turned over to carry out plate detection and measurement, the unevenness is 2mm/1000mm, and the national standard requirement is met.
Table 4 steel sheet rolling schedule of example 4
The above examples 1-4 show that the thick steel plate produced by the production method of the present invention does not need subsequent hot straightening or cold straightening, and the unevenness can meet the national standard. The method has good implementation effect, greatly improves the qualification rate of the finished steel plate and has extremely high economic benefit.
Claims (2)
1. A production method of a high-strength thick steel plate with yield strength of more than or equal to 370MPa is characterized by comprising the following steps:
(1) preparing slab raw material and heating furnace
Preparing the initial slab thickness H0The continuous casting plate blank with the cross section of 200 plus 300mm is continuously heated in a stepping mode by a heating furnace;
(2) heating the slab in the furnace
The prepared plate blank raw material is put into a heating furnace and then heated according to the heating rate of 8-12min/cm, the tapping temperature is 1200 +/-30 ℃, and the soaking time of the plate blank is more than or equal to 0.1 XH0+5min, said H0The thickness of the initial plate blank;
(3) slab hot rolling
The two-stage controlled rolling process is adopted after the heated plate blank is discharged from the furnace, and the specific conditions are as follows:
directly rolling the plate blank after being discharged from a furnace and descaled, wherein the rolling starting temperature of one stage is more than or equal to 1080 ℃, and widening passes are controlled according to the widening ratio according to the dimensional requirements of the blank and the rolled steel plate, and the specific conditions are as follows:
A. the broadening ratio is less than or equal to 1.2, and the broadening pass is less than or equal to 3 passes;
b.1.2 or more and the broadening ratio is less than or equal to 1.6, and the broadening pass is less than or equal to 4 passes;
C. the broadening ratio is more than or equal to 1.6, and the broadening pass is less than or equal to 5 passes;
the finishing temperature of the first stage is more than or equal to 1030 ℃, and the thickness H of the rolled intermediate billet is controlled1The following were used:
A. when the thickness H of the finished board is less than or equal to 60mm, H is adopted1≥2h-10mm；
B. When the thickness H of the finished board is more than 60mm, H is adopted1≥h+50mm；
The width-to-width ratio = rolling target width W ÷ slab width W;
secondly, in the second-stage initial rolling, the descaling water of the machine body is used once, and except the last 3 rolling passes, the rolling pass reduction rate of the rest two-stage rolling passes is required to be more than or equal to 10 percent; the second stage is last for 3 times, the absolute reduction of single pass is controlled to be more than 0.1 Xh, the reduction rate of single pass is controlled to be between 9 and 18 percent, and the bite speed is set to be more than or equal to 1.35m/sV0≥1.15m/s；
(4) Finished product inspection
After flaw detection, heat treatment and shearing, the rolled steel plate is turned over on a bench to inspect the unevenness of the steel plate, inspect the appearance, the size and the surface quality and the like, and the rolled steel plate can be off-line and put in storage after being qualified.
2. The production method of the high-strength thick steel plate with the yield strength of more than or equal to 370MPa according to claim 1, which is characterized by comprising the following steps of: the finished steel plate has the finished plate thickness h of 40-100mm, the width of 900-4200mm and the yield strength of more than or equal to 370 MPa.
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| CN112857861A (en) * | 2021-01-19 | 2021-05-28 | 南京钢铁股份有限公司 | Sampling and shearing method for steel for pressure container |
| CN113102502A (en) * | 2021-02-26 | 2021-07-13 | 舞阳钢铁有限责任公司 | Production method for hot rolling delivery steel plate with high surface quality |
| CN113333479A (en) * | 2021-06-08 | 2021-09-03 | 大力神铝业股份有限公司 | Method for head upturned deformation in aluminum alloy plate rolling process |
| CN114433638A (en) * | 2022-01-26 | 2022-05-06 | 宝武集团鄂城钢铁有限公司 | Method for controlling transverse unevenness of hot-rolled steel plate with thickness specification of less than or equal to 50mm |
| CN114472547A (en) * | 2022-02-08 | 2022-05-13 | 南京钢铁股份有限公司 | Method for controlling cracks of head corner part and tail corner part in rolling process |
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