CN111085547A - Manufacturing method of asymmetric dissimilar material hot-rolled composite coil - Google Patents
Manufacturing method of asymmetric dissimilar material hot-rolled composite coil Download PDFInfo
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- CN111085547A CN111085547A CN201911356047.0A CN201911356047A CN111085547A CN 111085547 A CN111085547 A CN 111085547A CN 201911356047 A CN201911356047 A CN 201911356047A CN 111085547 A CN111085547 A CN 111085547A
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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
- B21B47/00—Auxiliary arrangements, devices or methods in connection with rolling of multi-layer sheets of metal
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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
Abstract
A manufacturing method of an asymmetric dissimilar material hot-rolled composite coil comprises the following steps: 1) the base material is made of carbon steel, the composite material is made of stainless steel, and one surface of the base material and one surface of the composite material are milled until fresh metal is completely exposed; 2) pre-assembling a blank; 3) placing the blank pre-assembled in the step 2 in a vacuum chamber, and performing sealing welding treatment on the periphery of the blank by using an electron beam; 4) putting the welded composite blank in the step 3) into a heating furnace for heating; 5) and (3) feeding the composite blank heated in the step 4) into a roughing mill for asynchronous rolling, and performing conventional coiling at a cooling speed of 4-20 ℃/s and a coiling temperature of 420-550 ℃ after rolling to obtain the asymmetric dissimilar material hot-rolled composite coil. The invention adopts vacuum electron beam welding assembly, the assembly can be welded in the environment of higher vacuum degree, the stainless steel composite material with higher composite strength can be obtained, and the comprehensive yield is greatly improved.
Description
Technical Field
The invention belongs to the technical field of metal pressure processing, and particularly relates to a manufacturing method of an asymmetric dissimilar material hot-rolled composite coil.
Background
The stainless steel composite material is a novel material, and has multiple functions of environmental protection, energy conservation, low price and the like. The method is applied to a plurality of industries. In the production process of the stainless steel composite plate, an explosion method and a symmetrical compounding method are mostly adopted. The explosion method has great pollution to the environment, which is contrary to the green production advocated by the current society, so the method for producing the stainless steel composite plate by the explosion method is gradually eliminated. The traditional technology for producing the stainless steel composite plate by symmetrically assembling the blank needs to coat the isolating material between two layers of composite materials, and the surface treatment is carried out on the composite materials before the isolating material is coated, so that the technology is relatively complex, and the comprehensive yield is not high when the trimming amount of the base material is large during the post-finishing treatment.
Disclosure of Invention
The invention aims to provide a manufacturing method of an asymmetric dissimilar material hot-rolled composite coil, which adopts vacuum electron beam welding assembly, and the assembly can be welded under the environment of higher vacuum degree, so that a stainless steel composite material with higher composite strength can be obtained, and the comprehensive yield is greatly improved.
The invention is realized by the following technical scheme: 1. a manufacturing method of an asymmetric dissimilar material hot-rolled composite coil comprises the following steps:
1) the base material is made of carbon steel, the composite material is made of stainless steel, and one surface of the base material and one surface of the composite material are milled until fresh metal is completely exposed;
2) step 1, after milling the base material and the composite material, stacking the base material and the composite material with a certain size from top to bottom according to the sequence of the composite material and the base material, wherein the four edges of the base material and the composite material are required to be strictly aligned during stacking;
3) placing the blank pre-assembled in the step 2 into a vacuum chamber, and vacuumizing to 1.0 x 10-2Below pa, performing sealing welding treatment on the periphery of the blank by using an electron beam;
4) loading the welded composite blank in the step 3) into a heating furnace for heating, wherein sectional heating is adopted for heating;
5) feeding the heated composite blank obtained in the step 4) into a rough rolling mill for conventional rolling, wherein the rough rolling mill adopts the same diameter of an upper roller and a lower roller, the speed ratio of the upper roller to the lower roller is 1.01-1.5, the rough rolling mill adopts a low-speed high-pressure process, and the rolling temperature is more than or equal to 1080 ℃; and (3) performing conventional coiling at the finish rolling temperature of 820-920 ℃ and the cooling speed of 4-20 ℃/s after rolling at the coiling temperature of 420-550 ℃ to obtain the asymmetric dissimilar material hot-rolled composite coil.
And 3, before welding, centering the gap of the to-be-welded seam by using the electron beam gun head, and after centering, moving the electron beam gun head to one side of the base material by 0.05-0.15 mm for welding.
In the step 4), the heating coefficient is not lower than 1.0min/mm, the final heating temperature reaches 1100-1250 ℃, and the temperature uniformity of the composite blank is ensured.
The invention has the following beneficial effects: the invention relates to a manufacturing method of an asymmetric dissimilar material hot-rolled composite coil, which takes carbon steel as a base material and stainless steel as a composite material; the plate blank produced by adopting the vacuum electron beam welding method is a hot continuous rolling blank; the electron beam gun head is centered and then is welded in a mode of moving a certain distance to the base material, so that sufficient fusion depth can be ensured, and the blank cannot crack in the rolling process; the blank assembling method is environment-friendly and free of any pollution, and continuous production can be realized; because the vacuum chamber adopts a three-stage vacuum pump unit, higher vacuum degree can be achieved, and higher composite strength of the rolled composite plate is further ensured, and the shear strength of a composite interface is far more than the I-stage 210MPa specified by GB/T8165 plus 2008; compared with a stainless steel composite board produced by symmetrical assembly, the composite material produced by the production method can be rapidly cooled after surface rolling, so that the stainless steel can be rapidly avoided from a sensitization area, and the composite material is ensured to have good intergranular corrosion resistance.
Detailed Description
The invention is further described below with reference to examples.
Example 1
The blank size is 170mm 1500mm 5000mm asymmetric stainless steel composite blank; the blank consists of a 304 stainless steel plate and a Q235B blank; the size of the 304 stainless steel plate is 20mm 1500mm 5000mm, and the size of the Q235B blank is 150mm 1500mm 5000 mm; the target thickness of the rolling is 10 mm.
Firstly, one surface of a 304 stainless steel plate and a Q235B blank is milled, after milling is completed, the milled surface of the Q235B blank is placed on an assembly rack, then the milled surface of the 304 stainless steel plate is placed on the Q235B blank downwards, and when placing, the periphery of an upper material and the periphery of a lower material are required to be strictly aligned. The assembly rack applies certain pressure to the upper material and the lower material, and then spot welding and fixing treatment is carried out on the periphery of the pre-assembled blank;
and placing the pre-assembled blank into a vacuum welding machine chamber, and starting a vacuum pump after closing the cabin door. Meanwhile, an electron beam gun head is used for centering a gap to be welded, the electron beam gun head is moved 0.1mm to one side of the base material after centering, and when the vacuum value reaches 1.0 x 10- 2Starting welding when pa is lower, and ensuring that the vacuum value in the chamber is always kept at 1.0 x 10 by the whole operation of the vacuum pump-2pa or less;
and (3) putting the welded composite blank with the stainless steel surface facing upwards into a heating furnace of a hot rolling production line for heating. The heating coefficient meets 1.0min/mm, and the soaking temperature is controlled according to 1100-1250 ℃. The roughing mill adopts a roll system with the same upper and lower roll diameters, the speed ratio of the upper and lower rolls is set to be 1.08, the roughing mill performs four-pass rolling, the finishing mill performs seven-pass rolling, the finishing temperature of the finishing mill is 820-920 ℃, the cooling speed after rolling is 4-20 ℃/s, and the curling temperature is 420-550 ℃.
Example 2
The blank size is 220mm 1500mm 5000mm asymmetric stainless steel composite blank; the blank consists of a 304 stainless steel plate and a Q345B blank; the size of the 304 stainless steel plate is 20mm 1500mm 5000mm, and the size of the Q345B blank is 200mm 1500mm 5000 mm; the target thickness was 14 mm.
Firstly, one surface of a 304 stainless steel plate and a Q345B blank is milled, after milling is completed, the milled surface of the Q345B blank is placed on an assembly rack, then the milled surface of the 304 stainless steel plate is placed on the Q345B blank downwards, and when the arrangement is carried out, the periphery of an upper material and the periphery of a lower material are required to be strictly aligned. The assembly rack applies certain pressure to the upper material and the lower material, and then spot welding and fixing treatment is carried out on the periphery of the pre-assembled blank;
and placing the pre-assembled blank into a vacuum welding machine chamber, and starting a vacuum pump after closing the cabin door. Meanwhile, an electron beam gun head is used for centering a gap to be welded, the electron beam gun head is moved by 0.12mm to one side of the base material after centering, and when the vacuum value reaches 1.0 x 10- 2Starting welding when pa is lower, and ensuring that the vacuum value in the chamber is always kept at 1.0 x 10 by the whole operation of the vacuum pump-2pa or less;
and (3) putting the welded composite blank with the stainless steel surface facing upwards into a heating furnace of a hot rolling production line for heating. The heating coefficient meets 1.0min/mm, and the soaking temperature is controlled according to 1100-1250 ℃. The roughing mill adopts a roller system with the same upper and lower roller diameters, the speed ratio of the upper roller to the lower roller is set to be 1.05, the roughing mill performs four-pass rolling, the finishing mill performs seven-pass rolling, the finishing temperature of the finishing mill is 820-920 ℃, the cooling speed after rolling is 4-20 ℃/s, and the curling temperature is 420-550 ℃.
Claims (3)
1. The manufacturing method of the asymmetric dissimilar material hot-rolled composite coil is characterized by comprising the following steps of:
1) the base material is made of carbon steel, the composite material is made of stainless steel, and one surface of the base material and one surface of the composite material are milled until fresh metal is completely exposed;
2) step 1, after milling the base material and the composite material, stacking the base material and the composite material with a certain size from top to bottom according to the sequence of the composite material and the base material, wherein the four edges of the base material and the composite material are required to be strictly aligned during stacking;
3) placing the blank pre-assembled in the step 2 into a vacuum chamber, and vacuumizing to 1.0 x 10-2Below pa, performing sealing welding treatment on the periphery of the blank by using an electron beam;
4) loading the welded composite blank in the step 3) into a heating furnace for heating, wherein sectional heating is adopted for heating;
5) feeding the heated composite blank obtained in the step 4) into a rough rolling mill for conventional rolling, wherein the rough rolling mill adopts the same diameter of an upper roller and a lower roller, the speed ratio of the upper roller to the lower roller is 1.01-1.5, the rough rolling mill adopts a low-speed high-pressure process, and the rolling temperature is more than or equal to 1080 ℃; and (3) performing conventional coiling at the finish rolling temperature of 820-920 ℃ and the cooling speed of 4-20 ℃/s after rolling at the coiling temperature of 420-550 ℃ to obtain the asymmetric dissimilar material hot-rolled composite coil.
2. The manufacturing method of the asymmetric dissimilar material hot-rolled composite coil according to claim 1, wherein an electron beam gun head is used for centering a gap to be welded before welding in the step 3, and the electron beam gun head is moved 0.05-0.15 mm to one side of the base material for welding after centering.
3. The manufacturing method of the asymmetric dissimilar material hot-rolled composite coil as claimed in claim 1, wherein the heating coefficient in the step 4) is not less than 1.0min/mm, the final heating temperature reaches 1100 ℃ to 1250 ℃, and the temperature of the composite blank is ensured to be uniform.
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| CN201911356047.0A CN111085547A (en) | 2019-12-25 | 2019-12-25 | Manufacturing method of asymmetric dissimilar material hot-rolled composite coil |
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| CN201911356047.0A CN111085547A (en) | 2019-12-25 | 2019-12-25 | Manufacturing method of asymmetric dissimilar material hot-rolled composite coil |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112139763A (en) * | 2020-09-07 | 2020-12-29 | 山东钢铁集团日照有限公司 | Manufacturing method of high-carbon equivalent high-alloy super-thick steel plate |
| CN113578966A (en) * | 2021-08-02 | 2021-11-02 | 沈阳科安捷材料技术有限公司 | Production process and device of low-cost high-performance stainless steel composite plate coil |
| CN113909299A (en) * | 2021-09-08 | 2022-01-11 | 舞阳钢铁有限责任公司 | Production method of stainless steel composite board |
| CN114505343A (en) * | 2022-03-16 | 2022-05-17 | 山东钢铁集团日照有限公司 | Preparation method of composite plate assembly for ensuring smooth engagement of roll rolling and roll rolling method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113578966A (en) * | 2021-08-02 | 2021-11-02 | 沈阳科安捷材料技术有限公司 | Production process and device of low-cost high-performance stainless steel composite plate coil |
| CN113578966B (en) * | 2021-08-02 | 2023-09-19 | 沈阳科安捷材料技术有限公司 | Production process and device for low-cost high-performance stainless steel composite board roll |
| CN113909299A (en) * | 2021-09-08 | 2022-01-11 | 舞阳钢铁有限责任公司 | Production method of stainless steel composite board |
| CN114505343A (en) * | 2022-03-16 | 2022-05-17 | 山东钢铁集团日照有限公司 | Preparation method of composite plate assembly for ensuring smooth engagement of roll rolling and roll rolling method |
| CN114505343B (en) * | 2022-03-16 | 2023-11-24 | 山东钢铁集团日照有限公司 | Preparation method of composite board assembly capable of ensuring smooth biting of rolling and rolling method |
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