CN112139763A - Manufacturing method of high-carbon equivalent high-alloy super-thick steel plate - Google Patents
Manufacturing method of high-carbon equivalent high-alloy super-thick steel plate Download PDFInfo
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- CN112139763A CN112139763A CN202010927716.1A CN202010927716A CN112139763A CN 112139763 A CN112139763 A CN 112139763A CN 202010927716 A CN202010927716 A CN 202010927716A CN 112139763 A CN112139763 A CN 112139763A
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Abstract
The invention discloses a method for manufacturing a high-carbon equivalent high-alloy super-thick steel plate, which comprises the following steps of: selecting two or more suitable continuous casting billets according to the size of the finished product of the super-thick steel plate; assembling and then adopting two times of electron beam welding; milling, polishing and cleaning the continuous casting blank to be assembled; assembling the treated continuous casting billet; placing the pre-assembled blank in a vacuum chamber, and welding the welding seams at the periphery of the blank; lifting the blanks welded for the first time out of the vacuum chamber, and loading the blanks into a preheating furnace beside the vacuum chamber; placing the preheated blank into a vacuum chamber again for welding; putting the blanks subjected to secondary welding into the preheating furnace again, and putting the welded composite blanks into a production line heating furnace for heating; and rolling the heated composite blank to obtain the high-carbon equivalent high-alloy super-thick steel plate. The invention effectively realizes the rolling and compounding of the special high-carbon equivalent high-alloy super-thick steel plate, and has the advantages of simple process, high production efficiency and no pollution.
Description
Technical Field
The invention belongs to the field of preparation of super-thick steel plates, and relates to a manufacturing method of a high-carbon equivalent high-alloy super-thick steel plate.
Background
When the continuous casting billet is directly rolled to produce the ultra-thick steel plate, the thickness of the final steel plate is greatly limited due to the limitation of a compression ratio, and the high-quality ultra-thick steel plate with the product thickness exceeding 100mm is difficult to produce. In order to solve the problem of small compression ratio of a single continuous casting billet, many domestic steel mills adopt a composite billet making mode to produce super-thick steel plates with the thickness of more than 100 mm. The composite blank making process comprises the following steps: and the casting blanks are manufactured in a vacuum electron beam welding mode, and then are sent into a production line for heating and rolling. The method for producing the low-carbon equivalent and low-alloy steel has relatively mature process, and a plurality of steel mills realize continuous production. However, when the high carbon equivalent and high alloy steel are produced by using the method, after the vacuum electron beam welding is carried out by adopting the conventional process, the composite blank cracks in the heating process or in the initial stage of rolling, and the rolling cannot be finished.
In order to solve the problems, the periphery spot welding is carried out after the assembly of the high carbon equivalent or high alloy steel is finished, then the composite blank is put into a preheating furnace for integral preheating, and the vacuum electron beam welding is carried out after the preheating. The quality problem often appears in the steel plate composite interface produced by the process. After the whole production process is inquired, the reason for generating the problems is found to be: when the whole body is preheated after the spot welding of the blank, the fresh metal of the surface to be combined is oxidized to a certain degree in the preheating process, so that the composite quality is reduced.
The Chinese patent with application publication number CN103692166A discloses a method for preparing a super-thick alloy steel plate, and provides a method for preparing the super-thick alloy steel plate; chinese patent application publication No. CN103028897A discloses "a method for producing an extra thick steel plate with high cold crack sensitivity", both of these two production methods require two welding guns and are equipped with special assembly equipment, which increases a large amount of equipment investment and increases production cost. The production mode of adopting one gun head for preheating and one gun head for welding does not preheat the whole billet, so that the alloy steel plate with higher carbon equivalent and larger dimension has strong hardening tendency and larger welding deformation constraint effect, and the quality of a welding joint is difficult to control effectively.
Chinese patent application publication No. CN108381027A discloses a "vacuum welding apparatus for manufacturing a high carbon equivalent super-thick steel plate and a manufacturing method thereof", and a vacuum welding apparatus for manufacturing a high carbon equivalent super-thick steel plate and a manufacturing method thereof. The method needs an upper heat-compensating unit arranged on the top of the vacuum chamber and also comprises a lower heat-compensating unit, a double electron gun is arranged in the vacuum chamber, and a heat-insulating device is arranged between the double electron gun and the upper and lower heat-compensating units. The method not only needs double electron guns, but also needs to increase the heat supplementing units above and below the billet and the heat insulation devices between the heat supplementing units, the design needs to greatly increase the space of a vacuum chamber, the design and the manufacture are more complex, and a large amount of equipment investment funds are increased.
In order to solve the quality problem in the production of high-carbon equivalent and high-alloy steel composite blanks, the manufacturing method of the high-carbon equivalent and high-alloy super-thick steel plate is developed based on the principle of least investment.
Disclosure of Invention
The invention aims to provide a method for manufacturing a high-carbon equivalent high-alloy super-thick steel plate, which effectively realizes the rolling and compounding of the special high-carbon equivalent high-alloy super-thick steel plate, has simple working procedures, high production efficiency and no pollution.
The technical scheme adopted by the invention for solving the technical problems is as follows: a manufacturing method of a high-carbon equivalent high-alloy super-thick steel plate comprises the following steps:
(1) selecting two or more suitable continuous casting billets according to the size of the finished product of the super-thick steel plate; selecting a casting blank with the same furnace number and the same size for the continuous casting blank; after assembly, adopting two times of electron beam welding, preheating before the second welding, and slowly cooling after the second welding;
(2) processing a continuous casting blank to be assembled, milling a to-be-combined surface of the continuous casting blank, completely removing an iron oxide scale when the to-be-combined surface of the continuous casting blank is milled, integrally polishing the to-be-combined surface of the continuous casting blank after milling is finished, completely polishing the milled surface once, finally cleaning the to-be-combined surface of the continuous casting blank after polishing until the to-be-combined surface of the continuous casting blank is free of iron cutting, oil stain and dust; stacking the processed continuous casting blanks in sequence from bottom to top for assembly, and ensuring that the peripheries of the upper casting blank and the lower casting blank are strictly aligned;
(3) placing the pre-assembled blank in a vacuum chamber, and vacuumizing to 1.0 x 10-2Below pa, utilizing a small-energy electron beam to weld the welding seams at the periphery of the blank to quickly finish seal welding;
(4) lifting the blanks welded for the first time out of the vacuum chamber, and loading the blanks into a preheating furnace beside the vacuum chamber; measuring and calculating the empirical temperature of billet welding preheating according to the actual components of the billet, and adding 50 ℃ to perform integral preheating on the basis of the temperature;
(5) placing the preheated blank in the vacuum chamber again, and vacuumizing to 1.0 x 10-2pa, performing high-energy welding along the center of a blank welding seam by using electron beams; ensuring that the penetration after secondary welding is not less than 50 mm;
(6) putting the blanks subjected to secondary welding into the preheating furnace again, and slowly cooling the blanks along with the furnace from the integral preheating temperature to room temperature;
(7) loading the welded composite blank into a production line heating furnace for heating, wherein a four-section heating mode is adopted for heating; a first stage: the heating speed is not more than 120 ℃/h from the room temperature to 600 ℃; and a second stage: the heating speed is not more than 100 ℃/h between 600 ℃ and 900 ℃; a third stage: the heating speed is not more than 80 ℃/h between 900 ℃ and 1100 ℃ -1250 ℃; a fourth stage: soaking at 1100-1250 ℃, wherein the soaking time is determined according to the condition that the time of the blank in the furnace is not less than 12min/mm and is more than 600 ℃, and finally, the temperature of the composite blank is ensured to be uniform;
(8) when the composite blank is rolled, the roughing mill adopts a low-speed high-pressure process, the rolling temperature is more than or equal to 1080 ℃, and the thickness of the intermediate blank is not less than 1.5 times of that of the finished product; the finishing mill ensures that enough pass reduction rate is obtained, and the final rolling temperature is 850-950 ℃ to obtain the high-carbon equivalent high-alloy super-thick steel plate.
Further, in the step 2, the maximum gap between the upper casting blank and the lower casting blank is not more than 0.4 mm.
And furthermore, in the step 3, the fusion depth after welding is 10-20 mm.
The invention has the following beneficial effects: the manufacturing method of the high-carbon equivalent high-alloy super-thick steel plate effectively realizes the rolling and compounding of the special high-carbon equivalent high-alloy super-thick steel plate, and has the advantages of simple process, high production efficiency and no pollution.
Detailed Description
A manufacturing method of a high-carbon equivalent high-alloy super-thick steel plate comprises the following steps:
(1) selecting two or more suitable continuous casting billets according to the size of the finished product of the super-thick steel plate; selecting a casting blank with the same furnace number and the same size for the continuous casting blank; after assembly, adopting two times of electron beam welding, preheating before the second welding, and slowly cooling after the second welding;
(2) processing a continuous casting blank to be assembled, milling a to-be-combined surface of the continuous casting blank, completely removing an iron oxide scale when the to-be-combined surface of the continuous casting blank is milled, integrally polishing the to-be-combined surface of the continuous casting blank after milling is finished, completely polishing the milled surface once, finally cleaning the to-be-combined surface of the continuous casting blank after polishing until the to-be-combined surface of the continuous casting blank is free of iron cutting, oil stain and dust; stacking the processed continuous casting blanks in sequence from bottom to top for assembly, and ensuring that the peripheries of the upper casting blank and the lower casting blank are strictly aligned;
(3) placing the pre-assembled blank in a vacuum chamber, and vacuumizing to 1.0 x 10-2Below pa, utilizing a small-energy electron beam to weld the welding seams at the periphery of the blank to quickly finish seal welding;
(4) lifting the blanks welded for the first time out of the vacuum chamber, and loading the blanks into a preheating furnace beside the vacuum chamber; measuring and calculating the empirical temperature of billet welding preheating according to the actual components of the billet, and adding 50 ℃ to perform integral preheating on the basis of the temperature;
(5) placing the preheated blank in the vacuum chamber again, and vacuumizing to 1.0 x 10-2pa, performing high-energy welding along the center of a blank welding seam by using electron beams; ensuring that the penetration after secondary welding is not less than 50 mm;
(6) putting the blanks subjected to secondary welding into the preheating furnace again, and slowly cooling the blanks along with the furnace from the integral preheating temperature to room temperature;
(7) loading the welded composite blank into a production line heating furnace for heating, wherein a four-section heating mode is adopted for heating; a first stage: the heating speed is not more than 120 ℃/h from the room temperature to 600 ℃; and a second stage: the heating speed is not more than 100 ℃/h between 600 ℃ and 900 ℃; a third stage: the heating speed is not more than 80 ℃/h between 900 ℃ and 1100 ℃ -1250 ℃; a fourth stage: soaking at 1100-1250 ℃, wherein the soaking time is determined according to the condition that the time of the blank in the furnace is not less than 12min/mm and is more than 600 ℃, and finally, the temperature of the composite blank is ensured to be uniform;
(8) when the composite blank is rolled, the roughing mill adopts a low-speed high-pressure process, the rolling temperature is more than or equal to 1080 ℃, and the thickness of the intermediate blank is not less than 1.5 times of that of the finished product; the finishing mill ensures that enough pass reduction rate is obtained, and the final rolling temperature is 850-950 ℃ to obtain the high-carbon equivalent high-alloy super-thick steel plate.
In the step 2, the maximum gap between the upper casting blank and the lower casting blank is not more than 0.4 mm.
And 3, the penetration after welding reaches 10-20 mm.
Claims (3)
1. The manufacturing method of the high-carbon equivalent high-alloy super-thick steel plate is characterized by comprising the following steps of:
(1) selecting two or more suitable continuous casting billets according to the size of the finished product of the super-thick steel plate; selecting a casting blank with the same furnace number and the same size for the continuous casting blank; after assembly, adopting two times of electron beam welding, preheating before the second welding, and slowly cooling after the second welding;
(2) processing a continuous casting blank to be assembled, milling a to-be-combined surface of the continuous casting blank, completely removing an iron oxide scale when the to-be-combined surface of the continuous casting blank is milled, integrally polishing the to-be-combined surface of the continuous casting blank after milling is finished, completely polishing the milled surface once, finally cleaning the to-be-combined surface of the continuous casting blank after polishing until the to-be-combined surface of the continuous casting blank is free of iron cutting, oil stain and dust; stacking the processed continuous casting blanks in sequence from bottom to top for assembly, and ensuring that the peripheries of the upper casting blank and the lower casting blank are strictly aligned;
(3) placing the pre-assembled blank in a vacuum chamber, and vacuumizing to 1.0 x 10-2pa below, using small energy electron beam to weld the welding seam around the blankRapidly completing sealing welding;
(4) lifting the blanks welded for the first time out of the vacuum chamber, and loading the blanks into a preheating furnace beside the vacuum chamber; measuring and calculating the empirical temperature of billet welding preheating according to the actual components of the billet, and adding 50 ℃ to perform integral preheating on the basis of the temperature;
(5) placing the preheated blank in the vacuum chamber again, and vacuumizing to 1.0 x 10-2pa, performing high-energy welding along the center of a blank welding seam by using electron beams; ensuring that the penetration after secondary welding is not less than 50 mm;
(6) putting the blanks subjected to secondary welding into the preheating furnace again, and slowly cooling the blanks along with the furnace from the integral preheating temperature to room temperature;
(7) loading the welded composite blank into a production line heating furnace for heating, wherein a four-section heating mode is adopted for heating; a first stage: the heating speed is not more than 120 ℃/h from the room temperature to 600 ℃; and a second stage: the heating speed is not more than 100 ℃/h between 600 ℃ and 900 ℃; a third stage: the heating speed is not more than 80 ℃/h between 900 ℃ and 1100 ℃ -1250 ℃; a fourth stage: soaking at 1100-1250 ℃, wherein the soaking time is determined according to the condition that the time of the blank in the furnace is not less than 12min/mm and is more than 600 ℃, and finally, the temperature of the composite blank is ensured to be uniform;
(8) when the composite blank is rolled, the roughing mill adopts a low-speed high-pressure process, the rolling temperature is more than or equal to 1080 ℃, and the thickness of the intermediate blank is not less than 1.5 times of that of the finished product; the finishing mill ensures that enough pass reduction rate is obtained, and the final rolling temperature is 850-950 ℃ to obtain the high-carbon equivalent high-alloy super-thick steel plate.
2. The method of claim 1, wherein the maximum gap between the upper and lower strands in step 2 is not greater than 0.4 mm.
3. The method for manufacturing the high-carbon equivalent high-alloy super-thick steel plate according to claim 1, wherein the post-welding penetration in the step 3 is 10-20 mm.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113399948A (en) * | 2021-07-02 | 2021-09-17 | 东北大学 | Method for producing 1000MPa hydroelectric steel with thickness of more than 100mm and specification |
| CN114029706A (en) * | 2021-11-16 | 2022-02-11 | 山东钢铁集团日照有限公司 | Method for improving composite qualification rate of high-strength super-thick steel plate produced by vacuum pack rolling |
| CN114210893A (en) * | 2021-12-09 | 2022-03-22 | 山西太钢不锈钢股份有限公司 | Method for manufacturing large-diameter stainless steel round pipe blank |
| CN114378537A (en) * | 2022-01-14 | 2022-04-22 | 伊莱特能源装备股份有限公司 | Process for improving qualified rate of medium carbon alloy steel laminated blanks |
| CN114515897A (en) * | 2022-03-01 | 2022-05-20 | 山东钢铁集团日照有限公司 | Vacuum preheating and welding composite preparation process for high-carbon-equivalent thick plate blank |
| CN114523185A (en) * | 2022-02-09 | 2022-05-24 | 山东钢铁集团日照有限公司 | Vacuum diffusion hybrid welding production process for thick high-alloy plate blank |
| CN115255692A (en) * | 2022-08-03 | 2022-11-01 | 新疆八一钢铁股份有限公司 | Low-carbon high-Cr alloy billet connecting and rolling method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114210893A (en) * | 2021-12-09 | 2022-03-22 | 山西太钢不锈钢股份有限公司 | Method for manufacturing large-diameter stainless steel round pipe blank |
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| CN114523185B (en) * | 2022-02-09 | 2023-10-31 | 山东钢铁集团日照有限公司 | Vacuum diffusion composite welding production process for high-alloy thick plate blank |
| CN114515897A (en) * | 2022-03-01 | 2022-05-20 | 山东钢铁集团日照有限公司 | Vacuum preheating and welding composite preparation process for high-carbon-equivalent thick plate blank |
| CN114515897B (en) * | 2022-03-01 | 2024-01-23 | 山东钢铁集团日照有限公司 | Vacuum preheating welding composite preparation process for high-carbon-equivalent thick plate blank |
| CN115255692A (en) * | 2022-08-03 | 2022-11-01 | 新疆八一钢铁股份有限公司 | Low-carbon high-Cr alloy billet connecting and rolling method |
| CN115255692B (en) * | 2022-08-03 | 2024-03-22 | 新疆八一钢铁股份有限公司 | Low-carbon high-Cr alloy billet connection and rolling method |
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