CN110834202A - Production method of carbon-manganese low-temperature steel plate for large VLGC ship - Google Patents
Production method of carbon-manganese low-temperature steel plate for large VLGC ship Download PDFInfo
- Publication number
- CN110834202A CN110834202A CN201911138472.2A CN201911138472A CN110834202A CN 110834202 A CN110834202 A CN 110834202A CN 201911138472 A CN201911138472 A CN 201911138472A CN 110834202 A CN110834202 A CN 110834202A
- Authority
- CN
- China
- Prior art keywords
- blank
- temperature
- rolling
- steel plate
- carbon
- 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
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P23/00—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass
- B23P23/06—Metal-working plant comprising a number of associated machines or apparatus
-
- 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
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/16—Heating or cooling
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Heat Treatment Of Steel (AREA)
- Metal Rolling (AREA)
Abstract
The invention discloses a production method of a carbon-manganese low-temperature steel plate for a large VLGC ship, which relates to the technical field of steel smelting, and comprises the procedures of blank making, composite blank heating, composite blank rolling, composite blank straightening and composite blank splitting, wherein the production method adopts a composite blank stack rolling mode to produce the carbon-manganese low-temperature steel plate on the premise of not changing the component design, the rolling process and the existing rolling mill capability of the carbon-manganese low-temperature steel, and can be used for producing (8-10 mm) × (3500-4400 mm) wide and thin low-temperature steel plates in batches, and the steel plate has the characteristics of excellent low-temperature toughness at-60 ℃ or even-80 ℃, uniform plate performance, good plate shape, narrow thickness tolerance interval and the like.
Description
Technical Field
The invention relates to the technical field of steel smelting, in particular to a production method of a carbon-manganese low-temperature steel plate for a large VLGC ship.
Background
The C-Mn low-temperature steel plate for LPG ship is mainly used in the construction of LPG ship cargo tank with temperature over-55 deg.c and ship structure around the tank. As the liquefied petroleum gas needs to be stored at low temperature under the pressurized state, the steel plate is required to have certain strength, lower yield ratio, excellent low-temperature toughness at minus 60 to minus 80 ℃, lamellar tearing resistance, good weldability, processability and other comprehensive properties. At present, the products are produced by adopting TMCP technology at home and abroad, and in order to ensure the low-temperature performance requirement, the heating temperature, the rolling temperature and the post-rolling rapid cooling technology of the blank are strictly controlled. A few domestic medium and heavy plate enterprises have the capacity of mass production.
However, in recent years, with the increase in global LPG energy demand, LPG storage and transportation demand is increasing. The scale of the LPG transport ship is continuously developed towards large scale, for example, the current international latest large VLGC reaches 86000m3. The large-scale development of the VLGC puts higher requirements on the safety and stability of the service of the ship, so that the requirements on the design and construction process of the ship are more severe, and meanwhile, new challenges are brought to low-temperature steel plates required by ship building.
Welding is usually the most time-consuming link with the most investment in the process of building a large-scale VLGC, and meanwhile, because various defects often exist in a welding seam, a wide plate is usually adopted to build as much as possible in the design process so as to reduce more defects brought by the welding seam, and meanwhile, the safety problem and the cost increase caused by welding joints are avoided.
The limit width and thickness of the low-temperature steel plate for the large-scale VLGC is (8-10 mm) × (3500-4400 mm), although a few medium and heavy plate enterprises can realize the production of the steel plate with the limit width and thickness at present, the quality grade of the product can only meet-20 ℃ and even be maintained at 0 ℃ level in the prior art, and the low-temperature toughness requirement of the steel for the VLGC at-60 ℃ to-80 ℃ can not be met. Meanwhile, the wide and thin steel plates have high requirements on rolling mill equipment and rolling process, plate shape and quality problems such as buckling, edge waves and uneven performance of the steel plates are easily caused, and even the steel clamping damages production equipment, so that the qualification rate and the yield of products are greatly reduced. How to improve the batch supply capacity of the low-temperature steel with the extremely wide and thin specification becomes a pain point problem which restricts the independent construction of large-scale VLGC in China.
Disclosure of Invention
In order to solve the technical problems, the invention provides a production method of a carbon-manganese low-temperature steel plate for a large VLGC ship, which comprises the working procedures of blank making, composite blank heating, composite blank rolling, composite blank straightening, composite blank splitting,
blank preparation: carrying out surface grinding on two low-temperature steel blanks with the same size, uniformly coating a separant on the ground surfaces, and welding the two blanks by adopting a vacuum electron beam welding mode at the position of 30-50 mm around the ground surfaces;
heating the composite blank: the charging temperature of the blank is 200-500 ℃, the heating temperature is 1100-1150 ℃, and the heat preservation time is 180-300 min; rolling and straightening a composite blank: adopting a TMCP (thermal mechanical control processing) process, wherein the initial rolling temperature of the two stages is less than or equal to 900 ℃, the final rolling temperature is 800 +/-20 ℃, adopting a water cooling process after rolling, the temperature of red return is 580-630 ℃, and performing online straightening return 3-5 times after rolling;
and (3) splitting the composite blank: and trimming the rolled steel plate by adopting a plasma cutting machine, and separating the rolled steel plate into two finished steel plates after cutting.
The technical effects are as follows: the invention adopts the mode of composite blank rolling to produce on the premise of not changing the component design, rolling process and the capability of the existing rolling mill of the carbon-manganese low-temperature steel, can produce (8-10 mm) × (3500-4400 mm) wide and thin low-temperature steel plates in batches, has the characteristics of excellent low-temperature toughness at-60 ℃ and even-80 ℃, uniform performance of the whole plate, good plate shape, narrow thickness tolerance interval and the like, and can also be used for producing wide and thin medium plates in other fields.
The technical scheme of the invention is further defined as follows:
the production method of the carbon-manganese low-temperature steel plate for the large VLGC ship comprises a blank making process, wherein the thickness of a blank adopted is 100-150 mm.
The production method of the carbon-manganese low-temperature steel plate for the large VLGC ship comprises a blank manufacturing process, wherein the blank surface is ground in a mechanical grinding mode, the roughness of the ground blank surface is less than or equal to 5 mu m, and the unevenness is less than or equal to 3mm/m or less than or equal to 4mm/2 m.
The production method of the carbon-manganese low-temperature steel plate for the large VLGC ship comprises a composite blank rolling process, wherein 4-6 steel plates with the width of more than 4000mm are arranged for rolling before rolling the composite blank, and the rolling is carried out.
The production method of the carbon-manganese low-temperature steel plate for the large VLGC ship comprises a composite blank splitting process, wherein each edge is cut by 50-100 mm during cutting.
The production method of the carbon-manganese low-temperature steel plate for the large VLGC ship has the advantages that the thickness of a finished product is 8-10 mm, and the width is 3500-4400 mm.
In the production method of the carbon-manganese low-temperature steel plate for the large-scale VLGC ship, the main components of the separant comprise ferric chloride, magnesium chloride and water.
The invention has the beneficial effects that:
(1) in the composite blank rolling process, the roller is scalded before the composite blank is rolled, so that the temperature of the roller is uniform;
(2) the steel plate produced by the method can realize the low-temperature impact of more than or equal to 100J at the temperature of minus 60 ℃ to minus 80 ℃;
(3) the unevenness of the steel plate produced by the method designed by the invention can meet the requirements of less than or equal to 8mm/m and less than or equal to 12mm/2m (GB/T-709 requires 11/m and 17mm/2 m); the thickness tolerance range can meet 0-0.5 mm (GB/T-709 requires 0-1.8 mm);
(4) the invention has important significance for producing wide and thin low-temperature steel plates in most rolling mill wide and thick plate factories with the size of 5000mm and above.
Drawings
FIG. 1 is a photograph of the microstructure of a low temperature steel according to example 1 of the present invention;
FIG. 2 is a photograph of the microstructure of a low-temperature steel according to a comparative example of the present invention.
Detailed Description
Example 1
The production method of the carbon-manganese low-temperature steel plate for the large VLGC ship comprises the steps of blank making, composite blank heating, composite blank rolling, composite blank straightening and composite blank splitting.
Blank preparation: the thickness of the blank is 130mm, two low-temperature steel blanks with the same size are subjected to surface grinding, after the surface grinding is carried out for 5mm in a mechanical grinding mode, the surface roughness of the blanks is less than or equal to 5 microns, the unevenness is less than or equal to 3mm/m, a separant is uniformly coated on the welding surface after the grinding, the separant mainly comprises ferric chloride, magnesium chloride and water, and the two blanks are welded together at the position of 30-50 mm around the grinding surface in a vacuum electron beam welding mode;
heating the composite blank: the charging temperature of the blank is 250 ℃, the heating temperature is 1150 ℃, and the heat preservation time is 208 min;
rolling and straightening a composite blank: before rolling the composite blank, arranging 4-6 steel plates with the width of more than 4000mm for rolling, ironing the roller, adopting a TMCP (thermal mechanical control processing) process, rolling at the beginning temperature of 890 ℃ and the final rolling temperature of 820 ℃, adopting a water cooling process after rolling, returning to the red temperature of 630 ℃, and performing online straightening again for 5 times after rolling;
and (3) splitting the composite blank: the size of the rolled steel plate is 16 × 4050mm, a plasma cutting machine is adopted for trimming, each edge is cut by 70mm, and the steel plate is separated into two finished steel plates after cutting.
The thickness of the finished product is 8mm, and the width is 3910 mm. The mechanical properties and the unevenness of the finished steel sheet are shown in Table 1.
Example 2
The production method of the carbon-manganese low-temperature steel plate for the large VLGC ship comprises the steps of blank making, composite blank heating, composite blank rolling, composite blank straightening and composite blank splitting.
Blank preparation: the thickness of the blank is 140mm, two low-temperature steel blanks with the same size are subjected to surface grinding, after the surface grinding is carried out for 8mm in a mechanical grinding mode, the surface roughness of the blanks is less than or equal to 5 mu m, the unevenness is less than or equal to 3mm/m, a separant is uniformly coated on the welding surface after the grinding, the separant mainly comprises ferric chloride, magnesium chloride and water, and the two blanks are welded together at the position of 30-50 mm around the grinding surface in a vacuum electron beam welding mode;
heating the composite blank: the charging temperature of the blank is 350 ℃, the heating temperature is 1140 ℃, and the heat preservation time is 350 min;
rolling and straightening a composite blank: before rolling the composite blank, arranging 4-6 steel plates with the width of more than 4000mm for rolling, ironing the roller, adopting a TMCP (thermal mechanical control processing) process, rolling at the beginning temperature of 870 ℃ and the final temperature of 810 ℃ in two stages, adopting a water cooling process after rolling, returning to the red temperature of 600 ℃, and performing online straightening returning 3 times after rolling;
and (3) splitting the composite blank: the size of the rolled steel plate is 17 x 4400mm, a plasma cutting machine is adopted for trimming, each edge is cut by 100mm, and the steel plate is separated into two finished steel plates after cutting.
The thickness of the finished product is 8.5mm, and the width is 4200 mm. The mechanical properties and the unevenness of the finished steel sheet are shown in Table 1.
Example 3
The production method of the carbon-manganese low-temperature steel plate for the large VLGC ship comprises the steps of blank making, composite blank heating, composite blank rolling, composite blank straightening and composite blank splitting.
Blank preparation: the thickness of the blank is 150mm, two low-temperature steel blanks with the same size are subjected to surface grinding, after the surface grinding is carried out for 5mm in a mechanical grinding mode, the surface roughness of the blanks is less than or equal to 5 microns, the unevenness is less than or equal to 3mm/m, a separant is uniformly coated on the welding surface after the grinding, the separant mainly comprises ferric chloride, magnesium chloride and water, and the two blanks are welded together at the position of 30-50 mm around the grinding surface in a vacuum electron beam welding mode;
heating the composite blank: the charging temperature of the blank is 500 ℃, the heating temperature is 1130 ℃, and the heat preservation time is 300 min;
rolling and straightening a composite blank: before rolling the composite blank, arranging 4-6 steel plates with the width of more than 4000mm for rolling, ironing the roller, adopting a TMCP (thermal mechanical control processing) process, rolling at the beginning temperature of 860 ℃ and the finishing temperature of 800 ℃ in two stages, adopting a water cooling process after rolling, returning to the red temperature of 580 ℃, and performing online straightening returning 3 times after rolling;
and (3) splitting the composite blank: the size of the rolled steel plate is 20X 4600mm, the edge cutting is carried out by adopting a plasma cutting machine, each edge is cut by 100mm, and the steel plate is separated into two finished steel plates after cutting.
The thickness of the finished product is 10mm, and the width is 4400 mm. The mechanical properties and the unevenness of the finished steel sheet are shown in Table 1.
Comparative example
And (3) producing the low-temperature steel plate with the specification of 10 x 3500mm by adopting a conventional single rolling production method. The specification of the blank is 150mm, the charging temperature is 20 ℃, the heating temperature is 1200 ℃, and the heat preservation time is 214 min. The initial rolling temperature is 980 ℃, the final rolling temperature is 830 ℃, the weak cooling process is adopted after rolling, the temperature of red returning is 650 ℃, the online straightening is carried out for 5 times after rolling, and the mechanical properties and the unevenness of the finished steel plate are shown in table 1.
TABLE 1 quality of low-temperature steel plate
Referring to fig. 1 and 2, the structure of fig. 1 is fine ferrite grains plus a small amount of pearlite, and the uniform and fine structure ensures excellent low-temperature impact toughness at-60 to-80 ℃, and fig. 2 is a steel plate produced in a conventional manner, the structure is ferrite plus pearlite, the grain size is about 7 to 8 grades, and the mild mixed crystal phenomenon is generated, and the impact energy at-60 ℃ is lower. Therefore, the low-temperature steel plate produced by the production method can realize the low-temperature impact of more than or equal to 100J at the temperature of between 60 ℃ below zero and 80 ℃ below zero, the unevenness can meet the requirements of less than or equal to 8mm/m and less than or equal to 12mm/2m (GB/T-709 requires 11/m and 17mm/2m), and the thickness tolerance range can meet the requirements of 0 to 0.5mm (GB/T-709 requires 0 to 1.8 mm).
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 (7)
1. A production method of a carbon-manganese low-temperature steel plate for a large VLGC ship is characterized by comprising the following steps: comprises the procedures of blank making, composite blank heating, composite blank rolling, composite blank straightening and composite blank splitting,
blank preparation: carrying out surface grinding on two low-temperature steel blanks with the same size, uniformly coating a separant on the ground surfaces, and welding the two blanks by adopting a vacuum electron beam welding mode at the position of 30-50 mm around the ground surfaces;
heating the composite blank: the charging temperature of the blank is 200-500 ℃, the heating temperature is 1100-1150 ℃, and the heat preservation time is 180-300 min;
rolling and straightening a composite blank: adopting a TMCP (thermal mechanical control processing) process, wherein the initial rolling temperature of the two stages is less than or equal to 900 ℃, the final rolling temperature is 800 +/-20 ℃, adopting a water cooling process after rolling, the temperature of red return is 580-630 ℃, and performing online straightening return 3-5 times after rolling;
and (3) splitting the composite blank: and trimming the rolled steel plate by adopting a plasma cutting machine, and separating the rolled steel plate into two finished steel plates after cutting.
2. The method for producing the carbon-manganese low-temperature steel plate for the large-scale VLGC ship according to claim 1, wherein the method comprises the following steps: in the blank making process, the thickness of the adopted blank is 100-150 mm.
3. The method for producing the carbon-manganese low-temperature steel plate for the large-scale VLGC ship according to claim 1, wherein the method comprises the following steps: in the blank making process, the blank surface is ground in a mechanical grinding mode, the roughness of the ground blank surface is less than or equal to 5 microns, and the unevenness is less than or equal to 3mm/m or less than or equal to 4mm/2 m.
4. The method for producing the carbon-manganese low-temperature steel plate for the large-scale VLGC ship according to claim 1, wherein the method comprises the following steps: in the composite blank rolling procedure, 4-6 steel plates with the width of more than 4000mm are arranged for rolling before rolling the composite blank, and the rolling is carried out.
5. The method for producing the carbon-manganese low-temperature steel plate for the large-scale VLGC ship according to claim 1, wherein the method comprises the following steps: and in the composite blank splitting process, each edge is cut by 50-100 mm during cutting.
6. The method for producing the carbon-manganese low-temperature steel plate for the large-scale VLGC ship according to claim 1, wherein the method comprises the following steps: the thickness of the finished product is 8-10 mm, and the width is 3500-4400 mm.
7. The method for producing the carbon-manganese low-temperature steel plate for the large-scale VLGC ship according to claim 1, wherein the method comprises the following steps: the main components of the separant comprise ferric chloride, magnesium chloride and water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911138472.2A CN110834202A (en) | 2019-11-20 | 2019-11-20 | Production method of carbon-manganese low-temperature steel plate for large VLGC ship |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911138472.2A CN110834202A (en) | 2019-11-20 | 2019-11-20 | Production method of carbon-manganese low-temperature steel plate for large VLGC ship |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110834202A true CN110834202A (en) | 2020-02-25 |
Family
ID=69576790
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911138472.2A Pending CN110834202A (en) | 2019-11-20 | 2019-11-20 | Production method of carbon-manganese low-temperature steel plate for large VLGC ship |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110834202A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112317539A (en) * | 2020-09-24 | 2021-02-05 | 南京钢铁股份有限公司 | Method for reducing occurrence rate of re-straightening buckling of steel plate |
| CN113210421A (en) * | 2021-05-19 | 2021-08-06 | 宝武集团鄂城钢铁有限公司 | Production method for controlling transverse plate shape of high-quality carbon structural steel plate based on single-frame wide and thick plate rolling line |
| CN113564467A (en) * | 2021-07-13 | 2021-10-29 | 鞍钢股份有限公司 | Production method of high manganese steel medium plate for thin LNG storage tank |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106271414A (en) * | 2016-08-23 | 2017-01-04 | 南京钢铁股份有限公司 | A kind of preparation method of TMCP type bridge stainless steel clad plate |
-
2019
- 2019-11-20 CN CN201911138472.2A patent/CN110834202A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106271414A (en) * | 2016-08-23 | 2017-01-04 | 南京钢铁股份有限公司 | A kind of preparation method of TMCP type bridge stainless steel clad plate |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112317539A (en) * | 2020-09-24 | 2021-02-05 | 南京钢铁股份有限公司 | Method for reducing occurrence rate of re-straightening buckling of steel plate |
| CN113210421A (en) * | 2021-05-19 | 2021-08-06 | 宝武集团鄂城钢铁有限公司 | Production method for controlling transverse plate shape of high-quality carbon structural steel plate based on single-frame wide and thick plate rolling line |
| CN113210421B (en) * | 2021-05-19 | 2022-07-12 | 宝武集团鄂城钢铁有限公司 | Production method for controlling transverse plate shape of high-quality carbon structural steel plate |
| CN113564467A (en) * | 2021-07-13 | 2021-10-29 | 鞍钢股份有限公司 | Production method of high manganese steel medium plate for thin LNG storage tank |
| CN113564467B (en) * | 2021-07-13 | 2022-09-16 | 鞍钢股份有限公司 | Production method of high manganese steel medium plate for thin LNG storage tank |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110834202A (en) | Production method of carbon-manganese low-temperature steel plate for large VLGC ship | |
| WO2019128363A1 (en) | Preparation method of tmcp double phase stainless steel composite board for ship | |
| CN108188178B (en) | Production process of pack-rolled wide thin plate | |
| CN111360066B (en) | Low-cost, less-red-rust, high-strength and anti-seismic deformed steel bar production method and system | |
| CN109266815B (en) | Shape control method for online quenching high-strength steel plate | |
| CN107803401B (en) | Flat-bulb steel rolling device and rolling method | |
| CN104492810A (en) | Preparation method of wide and thin hot-rolled steel plates with width-to-thickness ratio being greater than or equal to 500 | |
| CN110076196B (en) | Production method of crack arrest steel for container ship | |
| CN106623423B (en) | A kind of manufacturing method using two igneous material technique of heavy and medium plate mill production technical pure titanium plate | |
| CN105690910B (en) | A kind of LNG storage tank and mobile container 9Ni steel/stainless compound steel plate and its manufacturing method | |
| CN104550234A (en) | Rolling method of pipeline steel and stainless steel composite plate | |
| CN109692873B (en) | Thin-clad titanium steel composite plate and preparation method thereof | |
| CN110394363B (en) | Production method for rolling high-quality carbon structural steel with thickness of more than or equal to 60mm by utilizing wide and thick plate finishing mill at differential temperature | |
| CN108754321A (en) | Super-thick normalized high-strength pressure vessel steel plate and production method thereof | |
| CN108723712A (en) | A kind of high anti-corrosion container super austenitic stainless steel composite plate and preparation method | |
| CN114959458A (en) | Manufacturing method of hot-rolled H-shaped steel for DH36 ocean engineering structure | |
| CN109023057A (en) | A kind of production method improving the impact of X80M grades of pipe line steel center portions | |
| CN110004359A (en) | A kind of high uniform vertically and horizontally toughness wide cut steel plate and its TMCP technique production method | |
| CN105032974A (en) | Production method of zirconium and zirconium alloy strip coil | |
| CN109355604A (en) | 5083H321 aluminium alloy thick plate preparation method | |
| CN109692884A (en) | Titanium steel composite board with IF steel as transition layer and high-temperature preparation method thereof | |
| CN103706645A (en) | Method for shortening temperature holding time of intermediate billet in process of hot continuous rolling | |
| CN106350735B (en) | Think gauge Q450NQR1 steel plates and its roughing method | |
| CN112126759B (en) | Method for improving impact toughness of TMCP (thermal mechanical control processing) steel for ships by texture control | |
| CN107326279A (en) | Thermo-mechanical rolling type special thick easily welding S460M structural steel and irons and production method |
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 | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200225 |