CN112718859A - Hot continuous rolling method for super duplex stainless steel coiled plate - Google Patents
Hot continuous rolling method for super duplex stainless steel coiled plate Download PDFInfo
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- 238000005096 rolling process Methods 0.000 title claims abstract description 112
- 229910001039 duplex stainless steel Inorganic materials 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000010438 heat treatment Methods 0.000 claims abstract description 26
- 238000005266 casting Methods 0.000 claims abstract description 25
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 230000008901 benefit Effects 0.000 abstract description 5
- 230000000052 comparative effect Effects 0.000 description 10
- 238000005098 hot rolling Methods 0.000 description 8
- 238000001816 cooling Methods 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 6
- 229910052804 chromium Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 239000012535 impurity Substances 0.000 description 5
- 229910052750 molybdenum Inorganic materials 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 238000005336 cracking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
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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
- B21B1/22—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 plates, strips, bands or sheets of indefinite length
- B21B1/24—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 plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—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 plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
-
- 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
- B21B37/16—Control of thickness, width, diameter or other transverse dimensions
-
- 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
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
- B21C47/02—Winding-up or coiling
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention provides a hot continuous rolling method of a super duplex stainless steel coil plate, which comprises the steps of heating a casting blank, rough rolling, finish rolling and coiling, wherein in the rough rolling step, 5-pass rolling is adopted, the initial rolling temperature is 1100-1170 ℃, and the casting blank is rolled to the thickness of 26-32 mm. The hot continuous rolling method is specially developed for super duplex stainless steel coils such as S32750, S32760 and the like, breaks through the restriction of rolling equipment, solves the problems of strip breakage of hot coils caused by precipitated phases, rolling cracks caused by large temperature drop of edges and the like, and produces the hot coils with qualified surfaces and performances. The application field of the super duplex stainless steel is expanded, the production efficiency and the yield are greatly improved, and the benefit is increased.
Description
Technical Field
The invention relates to a rolling method of a stainless steel coiled plate, in particular to a hot continuous rolling method of a super duplex stainless steel coiled plate.
Background
The S32750 and S32760 super duplex stainless steel coexists austenite and ferrite in a room temperature structure, the duplex ratio is close to 1:1, and the steel grade has high strength (the yield strength of the steel is generally austenite stainless steel)Double of) good Cl resistance-The corrosion-resistant welding material has the outstanding advantages of pitting corrosion resistance, stress corrosion resistance, welding performance and the like, and is widely used in the fields of petrochemical industry, salt making, hydraulic engineering, ship building, civil use and the like. Compared with common duplex stainless steel, the steel has the advantages of increased Cr, Mo and N contents, higher strength, better corrosion resistance and remarkable economic benefit.
The super duplex stainless steel has poor hot working plasticity and is easy to generate hot working cracks because two phases coexist and the deformation is not coordinated under the high-temperature state. Compared with the conventional duplex stainless steel S32205, the super duplex stainless steel contains higher Cr and Mo elements, and is more easy to generate precipitation of brittle harmful phases in tissues, thereby bringing huge destructive effects on production, manufacture and use.
In order to improve the thermal deformation condition of the super duplex stainless steel, the coil is produced by adopting a 'coil rolling' process at home and abroad at present. The furnace coil hot rolling can greatly reduce the temperature drop in the hot rolling process and ensure the rolling in the optimal plastic interval. On one hand, the crack caused by large temperature drop of the edge part can be prevented to the maximum extent, on the other hand, the generation of harmful precipitated phases in the hot rolling process can be avoided, and the band breakage in the subsequent production process is avoided. However, the process is severely limited by rolling equipment, the production efficiency is low, the energy consumption is high, and the yield is limited to be improved.
Disclosure of Invention
Aiming at the defects, the invention provides a hot continuous rolling method of a super duplex stainless steel coil.
The invention realizes the above purposes by the following technical scheme:
a hot continuous rolling method for a super duplex stainless steel coiled plate comprises the steps of casting blank heating, rough rolling, finish rolling and coiling, wherein in the rough rolling step, 5-pass rolling is adopted, the initial rolling temperature is 1100-1170 ℃, and the casting blank is rolled to the thickness of 26-32 mm.
Optionally, the super duplex stainless steel is super duplex stainless steel with designations S32750 and S32760.
Optionally, the shortest length of the casting blank is 8000 mm.
Optionally, in the heating step, the casting blank is sent into a stepping heating furnace for heating, the heating temperature is 1200-1280 ℃, and the furnace residence time is 8-15min/10mm in terms of the thickness of the casting blank.
Optionally, in the finish rolling step, the finish rolling temperature is 1020-.
Optionally, in the coiling step, the coiling temperature is 600-650 ℃.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
the hot continuous rolling method is specially developed for super duplex stainless steel coils such as S32750, S32760 and the like, breaks through the restriction of rolling equipment, solves the problems of strip breakage of hot coils caused by precipitated phases, rolling cracks caused by large temperature drop of edges and the like, and produces the hot coils with qualified surfaces and performances. The application field of the super duplex stainless steel is expanded, the production efficiency and the yield are greatly improved, and the benefit is increased.
Drawings
FIG. 1 shows the hot-rolled surface obtained in example 1.
Fig. 2 shows the hot-rolled surface obtained in comparative example 1.
Fig. 3 shows the hot-rolled surface obtained in comparative example 2.
Detailed Description
The present invention will be described in detail with reference to the following embodiments in order to fully understand the objects, features and effects of the invention. The process of the present invention employs conventional methods or apparatus in the art, except as described below. The following noun terms have meanings commonly understood by those skilled in the art unless otherwise specified.
Aiming at the characteristics of super duplex stainless steel and the difficulty of the production process of the coiled plate, the invention solves the problems of uncoiling fracture, edge hot rolling crack and the like of the super duplex stainless steel hot continuous rolling coiled plate by adjusting the processes of blank design, hot continuous rolling temperature, curling temperature and the like, and produces the hot rolling coiled plate with the specification of 4-10mm and qualified surface and performance.
The super duplex stainless steel to which the present invention is directed may comprise the following elements (in weight%): less than or equal to 0.030 percent of C, less than or equal to 1.00 percent of Si, less than or equal to 1.20 percent of Mn, less than or equal to 0.035 percent of P, less than or equal to 0.020 percent of S, 24.0-26.0 percent of Cr, 6.0-8.0 percent of Ni, 3.0-5.0 percent of Mo, 0.20-0.32 percent of N, less than or equal to 1.00 percent of Cu, less than or equal to 1.00 percent of W, and the balance of Fe and inevitable impurities.
The super duplex stainless steel to which the present invention is directed is, for example, super duplex stainless steels of designations S32750 and S32760. Wherein the composition of S32750 is (wt%): less than or equal to 0.030 percent of C, less than or equal to 0.80 percent of Si, less than or equal to 1.20 percent of Mn, less than or equal to 0.035 percent of P, less than or equal to 0.020 percent of S, 24.0-26.0 percent of Cr, 6.0-8.0 percent of Ni, 3.0-5.0 percent of Mo3, 0.24-0.32 percent of N, less than or equal to 0.50 percent of Cu, and the balance of Fe and inevitable impurities. The composition of S32760 is (wt%): less than or equal to 0.030 percent of C, less than or equal to 1.00 percent of Si, less than or equal to 1.00 percent of Mn, less than or equal to 0.030 percent of P, less than or equal to 0.010 percent of S, 24.0-26.0 percent of Cr, 6.0-8.0 percent of Ni, 3.0-4.0 percent of Mo, 0.20-0.30 percent of N, 0.50-1.00 percent of Cu, 0.50-1.00 percent of W, and the balance of Fe and inevitable impurities.
As a preferred embodiment, the hot continuous rolling method of the super duplex stainless steel coil according to the present invention comprises the steps of:
(1) heating a cast slab
The casting blank is sent into a stepping heating furnace for heating, the heating temperature is 1200-1280 ℃, and the furnace staying time is 8-15min/10mm (namely, the furnace staying time is 8-15min every 10mm according to the thickness of the casting blank).
In the invention, the purpose of heating the casting blank is to ensure that the casting blank is completely and uniformly burnt under the condition of ensuring the heating temperature. The crystal grains grow to be large due to overhigh temperature, and rolling cracks are easy to cause; if the temperature is too low, the strength is high and the deformation is difficult.
In the present invention, the length of the cast slab is specially designed. In order to reduce the temperature drop in the hot rolling process, the length of the casting blank is designed according to the millable shortest specification of 8000 mm. This makes the whole rolling process speed up, reduces the rolling process temperature drop.
(2) Rough rolling
And feeding the heated casting blank into a rough rolling mill group for rough rolling. Rolling for 5 times at the initial rolling temperature of 1100-1170 ℃ until the thickness is 26-32 mm.
Compared with 7-pass rolling, the 5-pass rolling can reduce the temperature drop in the rough rolling process on one hand, so that the biphase is in a temperature range with better thermoplasticity, and the surface quality is improved; on the other hand, compared with 3-pass rolling, the deformation of 5-pass rolling is smaller, so that the rolling is easier and the edge cracking control is facilitated.
The thickness of the rough rolling outlet is 26-32mm, the total deformation of the subsequent finish rolling and the deformation of each pass can be reduced, and the surface quality is improved.
Particularly, the inventor of the invention unexpectedly discovers that when the thickness of the rough rolling outlet is 26mm, the total deformation of the subsequent finish rolling and the deformation of each pass can be reduced, the surface quality can be improved, the comprehensive performance of the hot coil can be improved, and the yield can be improved.
(3) Finish rolling
And (4) sending the plate blank obtained by rough rolling into a finishing mill group for finish rolling. The final rolling temperature is 1020-.
The temperature of a finish rolling outlet is too high, and the temperature of the edge of the rolled plate is in an inconsistent deformation interval of the dual-phase structure, so that the edge of the surface has defects.
The outlet temperature of the finish rolling is too low, the sensitivity of the brittle sigma precipitated phase is very strong due to the high Cr and Mo content of steel, and the precipitated phase is generated in the structure to cause the fracture of the rolled plate.
Therefore, by selecting reasonable casting blank length, rough rolling outlet temperature, thickness and finish rolling outlet temperature, the whole rolling process is in a good thermoplastic (double-phase deformation coordination) interval no matter at the edge part or at the center, which is beneficial to controlling the edge part cracks and the surface quality of the rolled plate; meanwhile, the lower limit of the temperature of a finish rolling outlet is strictly controlled, so that the phenomenon that the strip of the rolled plate is broken due to sigma precipitated phases generated in the structure because the temperature in the hot rolling process is too low can be avoided.
(4) Coiling
After finishing the finish rolling, feeding laminar flow for cooling, and ensuring the curling temperature to be 600-650 ℃.
In the invention, the coiling aims to avoid the problems that the super duplex stainless steel is subjected to long-time heat preservation at 650-750 ℃ after being coiled into a coil, so that chi phase and R phase are separated out from a ferrite phase, the material becomes brittle and the material is broken through setting the enhanced laminar cooling after rolling and the coiling temperature. Therefore, the temperature after laminar cooling is strictly controlled.
Particularly, the inventors of the present invention have unexpectedly found that a remarkably good effect can be achieved when the curling temperature is 650 ℃, not only precipitation of harmful phases can be avoided, various properties of the hot rolled sheet are remarkably superior to national standards, but also the yield of the hot rolled sheet can be remarkably improved.
The hot continuous rolling method of the super duplex stainless steel coil successfully solves the problems of edge crack defect, harmful phase precipitation and harmful phase precipitation in hot coil tissues after coiling in the hot rolling process of the super duplex stainless steel coil such as S32750, S32760 and the like by adopting reasonable casting blank design, heating, rough rolling, finish rolling and coiling process parameters and by the mutual matching of the process steps, the surface of the produced hot coil is qualified, and the performance meets the standard requirement of ASTM-A240/A240M.
Examples
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention. The experimental methods without specifying specific conditions in the following examples were selected according to the conventional methods and conditions, or according to the commercial instructions.
Example 1
The embodiment is directed to super duplex stainless steel with the grade of S32750, which comprises the following components: 0.02% of C, 0.56% of Si, 0.93% of Mn, 0.021% of P, 0.001% of S, 25.28% of Cr, 7.0% of Ni, 3.99% of Mo, 0.25% of N, 0.02% of Cu, and the balance of Fe and inevitable impurities.
The hot continuous rolling method of the present embodiment is specifically as follows:
(1) the casting blank with the length of 8000mm and the thickness of 200mm is sent into a stepping heating furnace to be heated, the heating temperature is 1270 ℃, and the furnace standing time is 250 min.
(2) And feeding the heated casting blank into a rough rolling mill group for rough rolling. 5-pass rolling is adopted, the initial rolling temperature is 1150 ℃, and the thickness is 26 mm.
(3) And (4) sending the plate blank obtained by rough rolling into a finishing mill group for finish rolling. The thickness of the finished roll is 8 mm.
(4) And the outlet temperature of the finish rolling is 1030 ℃, and then laminar cooling is carried out, so that the curling temperature is ensured to be 650 ℃.
The surface of the hot coil obtained in example 1 is shown in FIG. 1.
The properties of the hot coil obtained in example 1 are shown in table 1. As can be seen from the data in Table 1, the properties of the hot coil prepared in example 1 not only meet the standard requirements of ASTM-A240/A240M, but also are much better than the standard requirements of ASTM-A240/A240M. In addition, the production efficiency of the hot continuous rolling method of example 1 is doubled compared with that of a steckel mill, and the hot coil yield reaches 96.2%.
TABLE 1
| Hot coil thickness/gauge | Rm MPa | Rp0.2 MPa | A(％) | HRC |
| 8mm | 897 | 658 | 33 | 23.5/23.5 |
| ASTM A240 | ≥795 | ≥550 | ≥15 | ≤32 |
Example 2
The embodiment is directed to super duplex stainless steel with the grade of S32760, which comprises the following components: 0.02% of C, 0.50% of Si, 0.8% of Mn, 0.02% of P, 0.001% of S, 25.22% of Cr, 7.0% of Ni, 3.3% of Mo, 0.26% of N, 0.6% of Cu, 0.6% of W, and the balance of Fe and inevitable impurities.
The hot continuous rolling method of the present embodiment is specifically as follows:
(1) and (3) feeding the casting blank with the length of 8000mm and the thickness of 200mm into a stepping heating furnace for heating, wherein the heating temperature is 1250 ℃, and the furnace standing time is 200 min.
(2) And feeding the heated casting blank into a rough rolling mill group for rough rolling. 5-pass rolling is adopted, the initial rolling temperature is 1170 ℃, and the thickness is 28 mm.
(3) And (4) sending the plate blank obtained by rough rolling into a finishing mill group for finish rolling. The final rolling temperature is 1020 ℃, and the thickness of the finished coil is 6 mm.
(4) And (4) after finishing rolling, feeding laminar flow for cooling, and ensuring the curling temperature to be 600 ℃.
The properties of the hot coil obtained in example 2 are shown in table 2. As can be seen from the data in Table 2, the properties of the hot coil prepared in example 2 not only meet the standard requirements of ASTM-A240/A240M, but also are much better than the standard requirements of ASTM-A240/A240M. In addition, the production efficiency of the hot continuous rolling method of example 2 is doubled compared with that of a steckel mill, and the hot coil yield reaches 94%.
TABLE 2
| Hot coil thickness/gauge | Rm MPa | Rp0.2 MPa | A(％) | HRC |
| 6mm | 870 | 620 | 30 | 24.5/23.5 |
| ASTM A240 | ≥750 | ≥550 | ≥25 | ≤32 |
Comparative example 1
This comparative example is directed to super duplex stainless steel having the same composition as example 1 and having the designation S32750.
The hot continuous rolling method of this comparative example is specifically as follows:
(1) and (3) feeding the casting blank with the length of 11500mm and the thickness of 200mm into a stepping heating furnace for heating, wherein the heating temperature is 1280 ℃, and the furnace standing time is 250 min.
(2) And feeding the heated casting blank into a rough rolling mill group for rough rolling. 7-pass rolling is adopted, the initial rolling temperature is 1180 ℃, and the steel is rolled until the thickness is 34 mm.
(3) And (4) sending the plate blank obtained by rough rolling into a finishing mill group for finish rolling, wherein the thickness of a finished coil is 8 mm.
(4) And the outlet temperature of the finish rolling is 980 ℃, and then laminar cooling is carried out, so that the curling temperature is guaranteed to be 680 ℃.
The hot-rolled surface obtained in comparative example 1 is shown in fig. 2.
Comparative example 2
This comparative example is directed to super duplex stainless steel having the same composition as example 1 and having the designation S32750.
The hot continuous rolling method of this comparative example is specifically as follows:
(1) and (3) feeding the casting blank with the length of 11500mm and the thickness of 200mm into a stepping heating furnace for heating, wherein the heating temperature is 1280 ℃, and the furnace standing time is 250 min.
(2) And feeding the heated casting blank into a rough rolling mill group for rough rolling. 7-pass rolling is adopted, the initial rolling temperature is 1180 ℃, and the steel is rolled until the thickness is 34 mm.
(3) And (4) sending the plate blank obtained by rough rolling into a finishing mill group for finish rolling, wherein the thickness of a finished coil is 8 mm.
(4) The outlet temperature of the finish rolling is 950 ℃, and laminar cooling is carried out after finishing, so that the curling temperature is ensured to be 600 ℃.
The hot coil obtained in comparative example 2 was broken as shown in fig. 3.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other substitutions, modifications, combinations, changes, simplifications, etc., which are made without departing from the spirit and principle of the present invention, should be construed as equivalents and included in the protection scope of the present invention.
Claims (6)
1. A hot continuous rolling method for a super duplex stainless steel coiled plate comprises the steps of heating a casting blank, rough rolling, finish rolling and coiling, and is characterized in that in the rough rolling step, 5-pass rolling is adopted, the initial rolling temperature is 1100-1170 ℃, and the casting blank is rolled to the thickness of 26-32 mm.
2. The method of hot continuous rolling a coil of super duplex stainless steel as claimed in claim 1, wherein the super duplex stainless steel is super duplex stainless steel with designations S32750 and S32760.
3. The method of hot continuous rolling of super duplex stainless steel coil as set forth in claim 1, wherein the cast slab has a length of 8000mm at the shortest.
4. The method for hot continuous rolling of the super duplex stainless steel coil plate as claimed in claim 1, wherein in the heating step, the ingot is heated in a step furnace at 1200-1280 ℃ for 8-15min/10mm in terms of ingot thickness.
5. The hot continuous rolling method for the super duplex stainless steel coil plate as claimed in claim 1, wherein in the finish rolling step, the finish rolling temperature is 1020-1050 ℃, and the thickness of the finished coil is 4-10 mm.
6. The hot continuous rolling method of the super duplex stainless steel coil plate as claimed in claim 1, wherein the coiling temperature is 600-650 ℃.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103286128A (en) * | 2013-05-30 | 2013-09-11 | 山西太钢不锈钢股份有限公司 | Super duplex stainless steel S32750 medium plate rolling process |
| CN106391704A (en) * | 2016-11-23 | 2017-02-15 | 东北大学 | Method for eliminating cracks of hot processed surface of 2205 dual-phase stainless steel middle plate |
| CN106734195A (en) * | 2016-12-16 | 2017-05-31 | 山西太钢不锈钢股份有限公司 | The milling method of two phase stainless steel roll bending is carried out using continuous hot-rolling mill |
| CN107723604A (en) * | 2017-11-29 | 2018-02-23 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of economical 690MPa levels dual phase steel and preparation method thereof |
| CN110773569A (en) * | 2019-10-18 | 2020-02-11 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Preparation process of S32750 super duplex stainless steel coiled plate |
| CN111793777A (en) * | 2020-08-20 | 2020-10-20 | 山东华星新材料科技有限公司 | 1000 MPa-level hot-rolled high-strength corrosion-resistant dual-phase steel plate and preparation method thereof |
-
2021
- 2021-01-22 CN CN202110093507.6A patent/CN112718859A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103286128A (en) * | 2013-05-30 | 2013-09-11 | 山西太钢不锈钢股份有限公司 | Super duplex stainless steel S32750 medium plate rolling process |
| CN106391704A (en) * | 2016-11-23 | 2017-02-15 | 东北大学 | Method for eliminating cracks of hot processed surface of 2205 dual-phase stainless steel middle plate |
| CN106734195A (en) * | 2016-12-16 | 2017-05-31 | 山西太钢不锈钢股份有限公司 | The milling method of two phase stainless steel roll bending is carried out using continuous hot-rolling mill |
| CN107723604A (en) * | 2017-11-29 | 2018-02-23 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of economical 690MPa levels dual phase steel and preparation method thereof |
| CN110773569A (en) * | 2019-10-18 | 2020-02-11 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Preparation process of S32750 super duplex stainless steel coiled plate |
| CN111793777A (en) * | 2020-08-20 | 2020-10-20 | 山东华星新材料科技有限公司 | 1000 MPa-level hot-rolled high-strength corrosion-resistant dual-phase steel plate and preparation method thereof |
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