CN111389939A - Control process for improving flaw detection qualification rate of medium and thick plates - Google Patents
Control process for improving flaw detection qualification rate of medium and thick plates Download PDFInfo
- Publication number
- CN111389939A CN111389939A CN202010149213.6A CN202010149213A CN111389939A CN 111389939 A CN111389939 A CN 111389939A CN 202010149213 A CN202010149213 A CN 202010149213A CN 111389939 A CN111389939 A CN 111389939A
- Authority
- CN
- China
- Prior art keywords
- steel
- equal
- hours
- steel plate
- thickness
- 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.)
- Pending
Links
Classifications
-
- 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
- B21B45/02—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 lubricating, cooling, or cleaning
- B21B45/0203—Cooling
-
- 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
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a control process for improving the flaw detection qualification rate of a medium plate, which relates to the technical field of steel smelting, wherein blanks of an over-vacuum process mainly meet the steel grade pile cooling requirement, the pile cooling requirement of pipeline steel blanks is not less than 48 hours, the steel grade with controllable surface quality is subjected to hot charging and hot conveying after being over-vacuum, and the pile cooling time is not more than 24 hours; and for the non-vacuum process blank, rolling a flaw detection steel plate with the thickness of more than or equal to 16mm, and cooling the blank in a pile for more than or equal to 48 hours. The control process provided by the invention obviously improves the qualification rate of the flaw detection steel plate in the plate coil factory, has low implementation difficulty, does not need additional cost investment and has obvious gain effect.
Description
Technical Field
The invention relates to the technical field of steel smelting, in particular to a control process for improving the flaw detection qualification rate of medium and heavy plates.
Background
The instability and the qualification rate of the flaw detection of the steel plates in the plate coil factory can lead to the batch judgment of the steel plates, and the cost is greatly increased due to the quality problem. Through sampling and scanning electron microscope analysis of the steel plate with unqualified flaw detection for many times, a large amount of Mn/S exists at the unqualified flaw detection position of the steel plate, and through data statistical analysis and comparison, the qualification rate of flaw detection in the vacuum furnace pass is obviously higher than that in the non-vacuum furnace pass.
Disclosure of Invention
In order to solve the technical problems, the invention provides a control process for improving the flaw detection qualification rate of a medium plate, wherein the blank of the over-vacuum process mainly takes the steel grade pile cooling requirement as a main part, the pile cooling requirement of the pipeline steel blank is not less than 48 hours, the steel grade with controllable surface quality is subjected to hot charging and hot conveying after being over-vacuum, and the pile cooling time is not more than 24 hours; and for the non-vacuum process blank, rolling a flaw detection steel plate with the thickness of more than or equal to 16mm, and cooling the blank in a pile for more than or equal to 48 hours.
The technical scheme of the invention is further defined as follows:
in the control process for improving the flaw detection qualification rate of the medium plate, the P1 and vacuum process conditions have the following limitations:
p1.1, vacuum process blank: the quality plan does not have blanks with special requirements, and the heap cooling time is executed according to P2;
p1.2, non-vacuum process blank: rolling a flaw detection steel plate with the thickness of more than or equal to 16mm, and performing quality planning according to the quality planning, wherein the blank pile cooling time is more than or equal to 48 hours and the quality planning has requirements; rolling other steel plates, wherein blank stacking cooling time and a quality plan have no special requirements and are executed according to P2;
p1.3, performing off-line stacking cooling on rolled steel plates in a medium-thickness plate coil factory, and performing stacking cooling time on blanks corresponding to the non-vacuum process according to P2;
p2, stock pile cooling
P2.1, hot charging steel grades, blank steel grades with the section thickness of less than or equal to 220mm, and cooling in a heap for less than or equal to 24 hours;
p2.2, the pile cooling time of the pipeline steel, all section thicknesses and all steel plate thicknesses is more than or equal to 48 hours;
p2.3, except for Q345, Q345-1, S355-J1, S355J-1, S355-J2 and S355J-2 steel, the dump cooling time of all the steel plate thicknesses rolled by the structural steel and container steel flaw detection plates is not less than 48 hours; the thickness of the rolled steel plates of structural steel and container steel is more than or equal to 50mm, and the cooling time of the casting blank is more than or equal to 25 hours; the thickness of the rolled steel plate of structural steel and container steel is less than 50mm, and the cooling time of the casting blank is more than or equal to 15 hours
The control process for improving the flaw detection qualification rate of the medium plate comprises A, B, D, D-Z, A131-B, A285GrA, A36(ASTM), A709Gr36, S235JR, S275JR, SN400B, SN400B-1, SS400-3, Q195, Q215B, Q235B, Q235DZ15, Q235B-NG, Q345B-NG, S35C/N35 and N40 in P2.1.
In the control process for improving the flaw detection qualification rate of the medium plate, in P2.3, the pipeline steel comprises 5, X-1, X-4, X-1, X-2, X-3, X-4, X-5, X-6, X-3, X-4, X-1, X52 (360 MBW), X60 (415 MBW), X65 (450 MBWD), X70 (485 MBW), X70-1 (485 MBW-1), X70-2 (485 MBW-2), X80 (555 MBW), BMS, X52, X60-1, X60-2, X65-2, X65-3, X70, BMO, X56-1, X60, X65-1, X70-70, X70-80, BMS and the thickness of the steel plate is equal to 48 hours or more.
In the P2.3, the structural steel and the container steel comprise A516M485/A516Gr70, A572Gr42, Q235DZ15-1, Q235DZ15-2, Q345-1, S355-J1, S355J-1, S355-J2, S355J-2, D-1-Z, A36-Si, A36-Si-Z, L R-A32, L R-A24-Z, L R-A32-V, S9R-A36, L R-A36-Z, L R-A36-7, 36, A-874, S JR-Cr, S235-1-Cr and Q-A36-Z, the thickness of the section of the steel plate is more than or equal to or more than 50mm, the cold stacking time of the steel plate with the thickness of 345 mm is more than or equal to 50 hours;
the steel plate further comprises Q245R, Q245RN-HIC, Q245RN, A516Gr60-Cr, SA515Gr60N-1, SA515Gr65N-1, SA515Gr70N-1, A516Gr60N-1, A516Gr 60N-2, A516Gr70N-1, A516Gr70N-5, A573Gr70, SM490A, SM490A-1, SM490A-3, SM490A-1-Cr, S355J-1-Cr, S355J-2-Cr, S235-Ti, S275-Ti, S355J-1-Ti and S355J-2-Ti, the section thickness of the section is less than or equal to 220mm, the stacking cooling time of the steel plate thickness is less than 50mm is 12 hours, and the stacking cooling time of the steel plate thickness is more than or equal to 24 hours;
the steel plate further comprises Q235D and Q295A (X), the thickness of the section is less than or equal to 220mm, and the heap cooling time of all the steel plate thicknesses is more than or equal to 24 hours;
the steel plate also comprises Q345GJD-1, Q345GJD-2, Q345GJD-3, S355J-3, S355J-4, Q420-1, Q420-2, Q420-3, Q420E-T1, S420M-1, S420M-2, Q345EN-1, Q345EN-2, SM490A-2 and S355J-3-Ti, the stack cooling time of the steel plate with the thickness of less than 50mm is more than or equal to 15 hours, and the stack cooling time of the steel plate with the thickness of more than or equal to 50mm is more than or equal to 48 hours;
the steel plate also comprises a steel plate with a thickness of A-T/D- - -T, EN, D36, E32, E36-1, E36-2, Q345-345-T, Q345-345-3, Q345-N, Q345-NR, Q345-1, Q345-2, Q370qEN-1, Q370qEN-2, Q370-2, A572Gr, Q420-4, S460-1, S460-2, H355, Q345-033, 10 MoCrAl, 16 Mo-573 Gr-PWHT, Q235NHC-1, Q235NHC-2, Q235NHC-3, Q295B-1, Q295B-2, S355JOWP, S355 JP-1, S355J 2-2, S355J 2-2, S355-2, S2-2, S345-3, Q345-2, Gr-2, Gr-2, Gr-2, W-2, W-2, Gr-2, W-2, W-2-60, W-2, W-60, W-2, W-2-No. 5, Gr-No. 5, Gr, No. 5, Gr-No. 90, Gr-No. 5, Gr-No. 90, Gr-No. 1-2, Gr-2, No. 1-2, Gr-2, No. 1-2, Gr-5-2, Gr-5-2, Gr-2, No. 1-2, Gr-2, No. 1-2, Gr-2, No. 1-2, W-2, No. 1-2, Gr-2, W-2, No. 1-2, Gr-2, No. 5-2, No. 1-2, W-2, W;
the steel plate also comprises flaw detection plates (except for Q345, Q345-1, S355-J1, S355J-1, S355-J2 and S355J-2 steel types), the thickness of the section is less than or equal to 220mm, and the stack cooling time of all the steel plate thicknesses is more than or equal to 48 hours.
The invention has the beneficial effects that: the control process provided by the invention obviously improves the qualification rate of the flaw detection steel plate in the plate coil factory, has low implementation difficulty, does not need additional cost investment and has obvious gain effect.
Detailed Description
In the control process for improving the flaw detection qualification rate of the medium and thick plates, which is provided by the embodiment, a south steel medium and thick plate coil mill production line is taken as an implementation object, and a new heap cooling process is executed from 10 months in 2016.
The flaw detection qualification rate of a medium-thickness plate coil factory in 2016 (1-9 months) is 98.84%, the batch judgment of steel plates is caused by the instability and qualification rate of the flaw detection qualification rate of the steel plates of the plate coil factory, the blank of the over-vacuum process is mainly in the steel grade pile cooling requirement, the pipeline steel blank pile cooling requirement is not less than 48 hours, the steel grade with controllable surface quality is subjected to hot charging and hot conveying after being over-vacuum, and the pile cooling time is not more than 24 hours by combing the over-vacuum process and the casting blank pile cooling process; and for the non-vacuum process blank, rolling a flaw detection steel plate with the thickness of more than or equal to 16mm, and cooling the blank in a pile for more than or equal to 48 hours. After the process system is implemented, in 2016, from 10 months to 12 months, the qualification rates of the flaw detection steel plates in the plate coil factories are 99.72%, 99.91% and 99.36% respectively, the total amount of the flaw detection steel plates in three months is 76423.53 tons, the average qualification rate of the flaw detection is 99.70%, and the average qualification rate of the flaw detection is obviously improved by 98.84% compared with the average qualification rate of the flaw detection in 1 month to 9 months. The annual average qualification rate of the flaw detection steel plates of the plate coil factories in 2017 and 2018 is 99.72% and 99.60%.
In 2016, 1 month to 4 months, the quantity of the S355-J1 steel plates is 56389.03 tons, the unqualified quantity is 1561.98 tons and the flaw detection qualification rate is 97.23 percent, after the process system is executed in 10 months, in 2016, 10 months to 12 months, the quantity of the S355-J1 steel plates is 12441.42 tons, the unqualified quantity is 59.32 tons and the flaw detection qualification rate is 99.52 percent.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (5)
1. A control process for improving the flaw detection qualification rate of medium and heavy plates is characterized by comprising the following steps of: the blank of the over-vacuum process mainly takes the steel grade pile cooling requirement as the main, the pipeline steel blank pile cooling requirement is more than or equal to 48 hours, the steel grade with controllable surface quality is subjected to hot charging and hot delivery after being over-vacuum, and the pile cooling time is less than or equal to 24 hours; and for the non-vacuum process blank, rolling a flaw detection steel plate with the thickness of more than or equal to 16mm, and cooling the blank in a pile for more than or equal to 48 hours.
2. The control process for improving the flaw detection qualification rate of the medium plate according to claim 1, which is characterized in that:
p1, vacuum process conditions have the following limitations:
p1.1, vacuum process blank: the quality plan does not have blanks with special requirements, and the heap cooling time is executed according to P2;
p1.2, non-vacuum process blank: rolling a flaw detection steel plate with the thickness of more than or equal to 16mm, and performing quality planning according to the quality planning, wherein the blank pile cooling time is more than or equal to 48 hours and the quality planning has requirements; rolling other steel plates, wherein blank stacking cooling time and a quality plan have no special requirements and are executed according to P2;
p1.3, performing off-line stacking cooling on rolled steel plates in a medium-thickness plate coil factory, and performing stacking cooling time on blanks corresponding to the non-vacuum process according to P2;
p2, stock pile cooling
P2.1, hot charging steel grades, blank steel grades with the section thickness of less than or equal to 220mm, and cooling in a heap for less than or equal to 24 hours;
p2.2, the pile cooling time of the pipeline steel, all section thicknesses and all steel plate thicknesses is more than or equal to 48 hours;
and (3) the heap cooling time of the thickness of all steel plates rolled by the structural steel and container steel flaw detection plates is more than or equal to 48 hours except Q345, Q345-1, S355-J1, S355J-1, S355-J2 and S355J-2 steel.
3. The control process for improving the flaw detection qualification rate of the medium plate according to claim 2, characterized in that: in the P2.1, hot charging steel grades comprise A, B, D, D-Z, A131-B, A285GrA, A36(ASTM), A709Gr36, S235JR, S275JR, SN400B, SN400B-1, SS400-3, Q195, Q215B, Q235B, Q235DZ15, Q235B-NG, Q345B-NG, S35C/N35 and N40.
4. The process according to claim 2, wherein the P2.3 steel line comprises 5, X-1, X-4, X-1, X-2, X-3, X-4, X-5, X-6, X-3, X-4, X-1, X52 (360 MBW), X60 (415 MBW), X65 (450 MBWD), X70 (485 MBW), X70-1 (485 MBW-1), X70-2 (485 MBW-2), X80 (555 MBW), BMS, BNS, X52, X60-1, X60-2, X65-2, X65-3, X70, BMO, X56-1, X60, X65-1, X65, X70-1, X48-48 hours, X48 hours, and all the cold-stacking time of the steel plate.
5. The control process for improving the flaw detection qualification rate of the medium plate according to claim 2 is characterized in that in the P2.3, structural steel and container steel comprise A516M485/A516Gr70, A572Gr42, Q235DZ15-1, Q235DZ15-2, Q345-1, S355-J1, S355J-1, S355-J2, S355J-2, D-1-Z, A36-Si, A36-Si-Z, L R-A32, L R-A32-Z, L R-A32-V, L R-A36, L R-A36-Z, L R-A36-V, AH32, AH36, A-Cr, S235-Cr 1-Si, Q-A36-Z, the cold-time of the steel plate is more than or less than 50mm, the cold-stacking time is less than or equal to 50 mm;
the steel plate further comprises Q245R, Q245RN-HIC, Q245RN, A516Gr60-Cr, SA515Gr60N-1, SA515Gr65N-1, SA515Gr70N-1, A516Gr60N-1, A516Gr 60N-2, A516Gr70N-1, A516Gr70N-5, A573Gr70, SM490A, SM490A-1, SM490A-3, SM490A-1-Cr, S355J-1-Cr, S355J-2-Cr, S235-Ti, S275-Ti, S355J-1-Ti and S355J-2-Ti, the section thickness of the section is less than or equal to 220mm, the stacking cooling time of the steel plate thickness is less than 50mm is 12 hours, and the stacking cooling time of the steel plate thickness is more than or equal to 24 hours;
the steel plate further comprises Q235D and Q295A (X), the thickness of the section is less than or equal to 220mm, and the heap cooling time of all the steel plate thicknesses is more than or equal to 24 hours;
the steel plate also comprises Q345GJD-1, Q345GJD-2, Q345GJD-3, S355J-3, S355J-4, Q420-1, Q420-2, Q420-3, Q420E-T1, S420M-1, S420M-2, Q345EN-1, Q345EN-2, SM490A-2 and S355J-3-Ti, the stack cooling time of the steel plate with the thickness of less than 50mm is more than or equal to 15 hours, and the stack cooling time of the steel plate with the thickness of more than or equal to 50mm is more than or equal to 48 hours;
the steel plate also comprises a steel plate with a thickness of A-T/D- - -T, EN, D36, E32, E36-1, E36-2, Q345-345-T, Q345-345-3, Q345-N, Q345-NR, Q345-1, Q345-2, Q370qEN-1, Q370qEN-2, Q370-2, A572Gr, Q420-4, S460-1, S460-2, H355, Q345-033, 10 MoCrAl, 16 Mo-573 Gr-PWHT, Q235NHC-1, Q235NHC-2, Q235NHC-3, Q295B-1, Q295B-2, S355JOWP, S355 JP-1, S355J 2-2, S355J 2-2, S355-2, S2-2, S345-3, Q345-2, Gr-2, Gr-2, Gr-2, W-2, W-2, Gr-2, W-2, W-2-60, W-2, W-60, W-2, W-2-No. 5, Gr-No. 5, Gr, No. 5, Gr-No. 90, Gr-No. 5, Gr-No. 90, Gr-No. 1-2, Gr-2, No. 1-2, Gr-2, No. 1-2, Gr-5-2, Gr-5-2, Gr-2, No. 1-2, Gr-2, No. 1-2, Gr-2, No. 1-2, W-2, No. 1-2, Gr-2, W-2, No. 1-2, Gr-2, No. 5-2, No. 1-2, W-2, W;
the steel plate also comprises flaw detection plates (except for Q345, Q345-1, S355-J1, S355J-1, S355-J2 and S355J-2 steel types), the thickness of the section is less than or equal to 220mm, and the stack cooling time of all the steel plate thicknesses is more than or equal to 48 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010149213.6A CN111389939A (en) | 2020-03-06 | 2020-03-06 | Control process for improving flaw detection qualification rate of medium and thick plates |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010149213.6A CN111389939A (en) | 2020-03-06 | 2020-03-06 | Control process for improving flaw detection qualification rate of medium and thick plates |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111389939A true CN111389939A (en) | 2020-07-10 |
Family
ID=71415017
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010149213.6A Pending CN111389939A (en) | 2020-03-06 | 2020-03-06 | Control process for improving flaw detection qualification rate of medium and thick plates |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111389939A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101419139A (en) * | 2008-05-06 | 2009-04-29 | 首钢总公司 | Method for preventing steel plate special for flaw detection from generating hydrogen induced cracking |
| CN102010963A (en) * | 2010-09-09 | 2011-04-13 | 秦皇岛首秦金属材料有限公司 | Method for effectively controlling medium plate detection defects |
| CN102344990A (en) * | 2011-07-08 | 2012-02-08 | 南阳汉冶特钢有限公司 | Method for improving internal quality of steel plate |
| CN104561732A (en) * | 2014-12-31 | 2015-04-29 | 南阳汉冶特钢有限公司 | Method for improving flaw detection quality of super-wide plate |
| CN107974615A (en) * | 2017-11-28 | 2018-05-01 | 天津中德应用技术大学 | Thickness is less than the Q460E high strength steel plates and its production method of 12mm |
| CN108823346A (en) * | 2018-08-10 | 2018-11-16 | 武汉钢铁集团鄂城钢铁有限责任公司 | A kind of method of low cost production second level flaw detection Q345R medium plate |
-
2020
- 2020-03-06 CN CN202010149213.6A patent/CN111389939A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101419139A (en) * | 2008-05-06 | 2009-04-29 | 首钢总公司 | Method for preventing steel plate special for flaw detection from generating hydrogen induced cracking |
| CN102010963A (en) * | 2010-09-09 | 2011-04-13 | 秦皇岛首秦金属材料有限公司 | Method for effectively controlling medium plate detection defects |
| CN102344990A (en) * | 2011-07-08 | 2012-02-08 | 南阳汉冶特钢有限公司 | Method for improving internal quality of steel plate |
| CN104561732A (en) * | 2014-12-31 | 2015-04-29 | 南阳汉冶特钢有限公司 | Method for improving flaw detection quality of super-wide plate |
| CN107974615A (en) * | 2017-11-28 | 2018-05-01 | 天津中德应用技术大学 | Thickness is less than the Q460E high strength steel plates and its production method of 12mm |
| CN108823346A (en) * | 2018-08-10 | 2018-11-16 | 武汉钢铁集团鄂城钢铁有限责任公司 | A kind of method of low cost production second level flaw detection Q345R medium plate |
Non-Patent Citations (6)
| Title |
|---|
| 李连任，等.: "厚规格低合金容器板探伤不合的原因分析及对策", 《宽厚板》 * |
| 汤忠义，梁合意，徐友良主编: "《金属材料与热处理》", 31 December 2011 * |
| 牛延龙: "厚规格X70管线钢板探伤不合原因分析及改进措施", 《宽厚板》 * |
| 王一雍，彭兴东，金辉编著: "《钢铁模拟冶炼指导教程》", 31 December 2015 * |
| 王三忠，等.: "安钢厚度不小于25mm钢板探伤检验不合格的原因分析", 《钢铁研究学报》 * |
| 王卫华，等.: "250～320 mm连铸板坯堆垛缓冷过程仿真计算", 《特殊钢》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN114525453A (en) | Thin-specification bridge steel and production method thereof | |
| CN112157135B (en) | Production method of economical cold-rolled steel plate for water heater water tank outer plate | |
| CN111389928B (en) | Method for producing ultrathin and ultra-wide limit specification nuclear power steel by wide and thick plate rolling mill | |
| CN111389939A (en) | Control process for improving flaw detection qualification rate of medium and thick plates | |
| CN110760659A (en) | Rolling process of weather-resistant welding wire steel for bridge | |
| US20040007290A1 (en) | Steel sheet for magnetic shields and manufacturing method thereof | |
| CN110846585A (en) | Q345C steel plate for railway bogie and manufacturing method thereof | |
| CN111438189A (en) | Cold-rolled sheet and shape control method thereof | |
| CN111687211B (en) | Rolling method of niobium-containing high-phosphorus high-strength weather-resistant hot-rolled H-shaped steel with stable low-temperature impact toughness | |
| CN110983182B (en) | 800 MPa-grade hot rolled steel and preparation method and application thereof | |
| CN110434183B (en) | Method for removing iron scale on surface of hot-rolled high-nickel steel plate | |
| CN109047692B (en) | Ultrathin high-strength steel plate capable of being used at-60 ℃ and manufacturing method thereof | |
| CN114247746B (en) | Production process for rolling flat plate by wedge-shaped thin slab on common hot rolling production line | |
| CN114985473A (en) | Configuration method and device for hot-rolled multi-roll shape | |
| CN113814275A (en) | Method for increasing hot charging rate of heating area of plate | |
| CN110983181B (en) | 700 MPa-grade hot rolled steel and preparation method and application thereof | |
| CN110343984B (en) | Zinc-iron alloy continuous hot dip galvanized steel sheet production process | |
| CN113231464A (en) | Method for reducing incidence rate of mixed crystal defects on surface of pickled plate | |
| CN113528779A (en) | Method for controlling strength reduction of axle housing steel after hot forming and axle housing steel prepared by method | |
| CN113684355B (en) | Steel plate self-tempering heat treatment process | |
| CN114657479B (en) | Hot-rolled corrosion-resistant steel with thick specification, high strength and excellent low-temperature toughness, and manufacturing method and application thereof | |
| CN113198850B (en) | Control method and control system of hot finishing mill group and industrial control equipment | |
| CN108913852B (en) | Method for producing tin plate substrate based on cover-type annealing process | |
| CN115318870A (en) | Control method for improving primary qualified rate of pipeline steel plate shape | |
| CN110193515B (en) | Rolling method of austenitic stainless steel hard plate |
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 | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200710 |
|
| RJ01 | Rejection of invention patent application after publication |