CN103028897A - Production method of super-thick steel plate with high cold crack sensitivity - Google Patents
Production method of super-thick steel plate with high cold crack sensitivity Download PDFInfo
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- CN103028897A CN103028897A CN2011103031031A CN201110303103A CN103028897A CN 103028897 A CN103028897 A CN 103028897A CN 2011103031031 A CN2011103031031 A CN 2011103031031A CN 201110303103 A CN201110303103 A CN 201110303103A CN 103028897 A CN103028897 A CN 103028897A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 51
- 239000010959 steel Substances 0.000 title claims abstract description 51
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 230000035945 sensitivity Effects 0.000 title abstract 2
- 238000003466 welding Methods 0.000 claims abstract description 35
- 238000010894 electron beam technology Methods 0.000 claims abstract description 17
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000005096 rolling process Methods 0.000 claims description 15
- 238000009749 continuous casting Methods 0.000 claims description 10
- 229910000679 solder Inorganic materials 0.000 claims description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 238000005266 casting Methods 0.000 claims description 3
- 238000003306 harvesting Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims description 2
- 230000003746 surface roughness Effects 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 11
- 238000010438 heat treatment Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000010408 sweeping Methods 0.000 description 4
- 239000000956 alloy Substances 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005275 alloying Methods 0.000 description 2
- 238000004512 die casting Methods 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000005272 metallurgy Methods 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- 238000005496 tempering Methods 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000005984 hydrogenation reaction Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 201000009240 nasopharyngitis Diseases 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a method for producing an ultra-thick steel plate with high cold crack sensitivity, which is characterized in that a cold crack welding sensitive steel plate with carbon equivalent of more than or equal to 0.61 percent is preheated and welded in a double electron beam gun arrangement mode under a vacuum environment, and then the steel plate is heated and rolled to produce the ultra-thick steel plate. The invention has wide range of preheating temperature, small temperature drop, no cold crack of welded ultra-thick plate blank, simple production process, short construction period, suitability for industrial mass production and remarkable economic and social benefits.
Description
Technical field
The present invention relates to a kind of thickness in the production method of 100mm～300mm super-thick steel plate, particularly the high Plate Production method of a kind of cold crack sensitiveness belongs to field of metallurgy.
Background technology
Cold crack sensitiveness height is engaged in worker's common concern of metallurgy industry as the important evidence of evaluating steel welding performance quality.Generally, the cold crack sensitiveness of steel is stronger, and the tendency that cold crack appears in postwelding is just larger, needs the pre-heat treatment before this class steel welding, and sensitiveness is stronger, and preheat temperature is just higher, and particularly carbon equivalent is greater than the steel grade more than 0.61%.For fear of the Produced after Welding cold crack, the designer generally adopts the Composition Design theory of low-carbon (LC), low-alloy, low-carbon-equivalent when therefore developing new steel grade.But being manufacturings of the equipment part of a lot of industries, extraordinary special installation, actual conditions need the steel of high strength, superhigh intensity as material, the general phosphorus content of these materials is very high to contain again multiple alloying element, the carbon equivalent of bringing thus is relatively very large, the thickness requirement of a lot of equipment, the used steel plate of parts is larger in addition, and this has brought certain difficulty for the production of this type of steel plate.The at present production of special heavy plate is generally adopted continuous casting billet Direct Rolling and die casting to produce steel ingot and is passed through pressure processing production again, but the former is limited because of its continuous casting material thickness specification, can not produce the steel plate of larger thickness specification, the latter has the weak points such as the steel ingot internal soundness is unstable, defective is many because its strand adopts die casting production.Therefore adopting the mode of slab ply rolling to produce special heavy plate is effective mode, the combination of slab need to be under vacuum environment, fetch by electron beam welding and to finish, need the pre-heat treatment before the common cold crack sensitive steel weldering, preheating method is more, but ubiquity preheating thermal source acquisition pattern is complicated, the preheating welding process equipment is loaded down with trivial details, temperature drop is fast and need the problem such as insulation processing after the preheating, the result causes weldquality bad, be prone to cold crack, be difficult to make the cold crack sensitive steel of special thick specification.
" a kind of vacuum electron beam welding method " (publication number CN1962153A) before the present invention, disclosed.This invention adopts an electron beam gun to carry out preheating and twice welding, and the processing of intermediate demand vacuum heat-preserving, and technique is loaded down with trivial details.
" high temperature electron beam welding " (publication number CN 101172316A) before the present invention, disclosed.Although the preheat temperature of this invention can reach at least 1500 °F, the thermal source of preheating comes self-resistance, induction or radiation, and welding process needs to add filler in weld seam.
" a kind of high-strength or super-high strength steel laser-electrical arc composite heat source welding method " (publication number CN 101367157A) before the present invention, disclosed.The laser-arc hybrid welding method is adopted in this invention, although can reduce Plate Welding preheat temperature or without preheating welding, the welding heat source mode that the method is used is complicated, operation inconvenience.
" vacuum electron beam welding method " (publication number CN101559515A) before the present invention, disclosed.This invention adopts an electron beam gun to carry out preheating and twice welding with (publication number CN 1962153A), though middle the employing need not the vacuum heat-preserving processing, application is single.
Summary of the invention
The present invention seeks to by under vacuum environment, two blocks of steel billets are stacked together, one in front and one in back the preheating of two boards base is welded together by two electron beam guns, pass through again follow-up steel rolling production, special cold crack sensitive steel for low-alloy high-strength, superhigh intensity, adopt the be beyond one's reach high steel grade of cold crack sensitiveness of postwelding flawless effect of other modes, invent a kind of production method of super-thick steel plate, the steel plate that the method is produced has that production technology is simple, the thickness specification is large, the characteristics of postwelding flawless etc.
The production technology of a kind of cold crack sensitiveness of the present invention super-thick steel plate is as follows:
A) raw material choose carbon equivalent 〉=0.61% to the highstrung steel grade of cold crack, female base adopts the continuous casting mode to produce, strand upper and lower surface flatness is not more than 1.0mm/mm
2Specification is cut according to the vacuum chamber size, 150mm≤thickness≤300mm, 1000mm≤length≤6000mm, 1000mm≤width≤3000mm;
B) female base surface and facade are cleared up, except removing iron scale, solder side is the continuous casting billet extrados, and surface roughness will reach more than the 6.3 μ m, and the side roughness reaches 12.5 μ m;
C) enter in the vacuum chamber after two block casting base extrados make-ups after the machined align and weld, vacuumize processing before the welding, vacuum is less than 1 * 10
-1Pa;
D) female base is under vacuum environment, adopt electron beam to carry out pre-thermal weld, the present invention uses the twin-cathode ray beam welding gun to carry out pre-thermal weld, every rifle is all had independently vacuum system, cooling system and electric control system, rush-harvesting and rush-planting simultaneously mutual when working does not disturb, accelerating potential 60kV～80kV, electronic beam current intensity 30mA～120mA;
When e) female base carries out pre-thermal weld, two rifles are one in front and one in back worked simultaneously along weld seam, two gun axis lines distances for 400mm～700mm, solder joint to the operating distance of rifle be 150mm～300mm, beam spot diameter, be 0.1～1mm, electron beam scanning scope for ± 6 ° be that 1～1000Hz, preheat temperature scope are that 0 ℃～1000 ℃, preheating, speed of welding are 0.1～1m/min with scan frequency.This step sees accompanying drawing 1 for details;
F) the postwelding assembly enters the batch-type furnace heat tracing, the combination blank is heated evenly, rolling employing Direct Rolling mode, control open rolling and finishing temperature;
G) rolling rear steel plate heat-treats as required.
The invention has the beneficial effects as follows by under vacuum environment, adopt twin-cathode ray beam rifle arrangement that the cold crack welding sensitive steel of carbon equivalent 〉=0.61% is carried out preheating and welding, then carry out heating rolling and produce super-thick steel plate.This invention preheat temperature wide ranges, temperature drop are very little, the extra-thick plate blank after the welding occurs without cold crack, and production technology is simple, the duration is short, be fit to the large production of industry, can produce significant economic and social benefit.
Description of drawings
Fig. 1 rush-harvesting and rush-planting preheating welding assembly artwork.
The specific embodiment
Below in conjunction with embodiment the present invention is described in further details:
1, the 12Cr2Mo1R steel is a kind of for the manufacture of the special equipments such as hydrogenation reactor and high pressure heat exchanger steel, because this steel grade carbon content is higher, alloying element content is large, therefore carbon equivalent is very large, and need the thickness of finished steel plate all very large, produce easily cold crack during welding, therefore must be through the pre-heat treatment before the weldering.Present embodiment selects 2 blocks of continuous casting billets to carry out surface treatment, and solder side is the continuous casting billet extrados, and roughness reaches more than the 6.3 μ m, and the side reaches 12.5 μ m, and the blank flatness is 0.8mm/mm
2, then be that 250mm, length are that 4000mm, width are that the assembly solder side alignment of 2300mm pushes the pre-thermal weld of vacuum chamber with 2 thickness.Welding booth's vacuum≤5 * 10
-2Mpa, the accelerating potential of preheating lance are that 60kV, beam intensity are that 60mA～80mA, preheating speed are that 200mm/min, beam spot diameter, are that 0.8mm, electron beam surface sweeping scope ± 6 °, scan frequency are 280 ℃ of 500Hz, preheat temperatures; The accelerating potential of welding gun is that 80kV, beam intensity are that 80mA～100mA, speed of welding are that 200mm/min, beam spot diameter, are that the axial line distance of 0.5mm, electron beam surface sweeping scope ± 2 °, scan frequency 600Hz, two rifles is that 500mm, solder joint are 180mm to the operating distance of rifle.The combination steel billet carries out heat tracing behind the electron beam welding, and heating-up temperature is 1200 ℃, and temperature retention time 20 hours is grilled thoroughly steel billet fully, is heated evenly; The steel billet of soaking directly is rolled, and start rolling temperature is 1150 ℃, 890 ℃ of finishing temperatures, and the mill product steel plate thickness is 150mm; Heat-treat 920 ℃ of normalizing temperatures, 685 ℃ of tempering after rolling.Embodiment composition, performance are shown in numbering 1 in the table 1,2, and the result all satisfies the national standard requirement of this steel grade.
2, the 18MnMoNbR steel is the large-scale middle temperature boiler of a kind of manufacturing and steels for pressure vessel use, the series low-alloy high-strength steel, and this steel carbon content is very high, carbon equivalent is very large, the applied thickness requirement is thicker, therefore needs higher preheat temperature before the weldering.Select 2 blocks of continuous casting billets to carry out surface treatment, solder side is the continuous casting billet extrados, and roughness reaches more than the 6.3 μ m, and the side reaches 12.5 μ m, and the blank flatness is 0.6mm/mm
2, then be that 200mm, length are that 4500mm, width are that the assembly of the assembly solder side alignment of 2000mm pushes the pre-thermal weld of vacuum chamber with 2 thickness.Welding booth's vacuum≤5 * 10
-2Mpa, the accelerating potential of preheating lance are that 60kV, beam intensity are that 60mA～80mA, preheating speed are that 240mm/min, beam spot diameter, are 140 ℃ of 0.8mm, electron beam surface sweeping scope ± 6 °, scan frequency 500Hz, preheat temperature; The accelerating potential of welding gun is that 80kV, beam intensity are that 80mA～100mA, speed of welding are that 240mm/min, beam spot diameter, are 0.5mm, electron beam surface sweeping scope ± 2 °, and the axial line distance of two rifles is that 500mm, solder joint are 220mm to the operating distance of rifle.Combination base behind the electron beam welding carries out heat tracing to be processed, and heating-up temperature is 1200 ℃, temperature retention time 17 hours; After being heated evenly, directly be rolled, 1140 ℃ of start rolling temperatures, finishing temperature is 870 ℃, finished product thickness is 100mm; Heat treatment process parameter is 930 ℃ of normalizing temperatures, 670 ℃ of tempering.Embodiment composition, performance are shown in numbering 2 in the table 1,2, and the result all satisfies the national standard requirement of this steel grade.
Table 1 embodiment chemical composition (wt%)
| Numbering | C | Si | Mn | P | S | Cr | Mo | Carbon equivalent |
| 1 | 0.13 | 0.19 | 0.46 | 0.006 | 0.003 | 2.05 | 0.92 | 0.80 |
| 2 | 0.22 | 0.41 | 1.51 | 0.006 | 0.003 | 0.15 | 0.58 | 0.61 |
Table 2 embodiment mechanical property
Claims (4)
1. super-thick steel plate production method that cold crack sensitiveness is high is characterized in that mainly may further comprise the steps:
A) steel grade of raw material choose carbon equivalent 〉=0.61%, female base adopt the continuous casting mode to produce, and strand upper and lower surface flatness is not more than 1.0mm/mm
2, specification is cut according to the vacuum chamber size;
B) female base surface and facade are cleared up, except removing iron scale, solder side is the continuous casting billet extrados, and surface roughness will reach more than the 6.3 μ m, and the side roughness reaches 12.5 μ m;
C) enter in the vacuum chamber after two block casting base extrados make-ups align and weld, vacuumize processing before the welding, vacuum is less than 1 * 10
-1Pa;
D) use the twin-cathode ray beam welding gun to carry out pre-thermal weld, two rifles are one in front and one in back worked simultaneously along weld seam, two gun axis lines distances be 400～700mm, solder joint to the operating distance of rifle be 150～300mm, beam spot diameter, be 0.1～1mm, electron beam scanning scope for ± 6 ° be that 1～1000Hz, preheat temperature scope are that 0～1000 ℃, preheating speed of welding are 0.1～1m/min with scan frequency;
E) the postwelding assembly enters the batch-type furnace heat tracing, and the combination blank is heated evenly, and rolling employing Direct Rolling mode is heat-treated after rolling.
2. the high super-thick steel plate production method of a kind of cold crack sensitiveness according to claim 1 is characterized in that the batch-type furnace heating-up temperature is 1150～1350 ℃, is incubated 15～25 hours, and start rolling temperature is greater than 1100 ℃, and finishing temperature is greater than 850 ℃.
3. the high super-thick steel plate production method of a kind of cold crack sensitiveness according to claim 1 is characterized in that casting blank specification is: 150mm≤thickness≤300mm, 1000mm≤length≤6000mm, 1000mm≤width≤3000mm.
4. the high super-thick steel plate production method of a kind of cold crack sensitiveness according to claim 1, it is characterized in that every rifle all being had independently vacuum system, cooling system and electric control system, rush-harvesting and rush-planting simultaneously mutual when working does not disturb, accelerating potential 60～80kV, electronic beam current intensity 30～120mA.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105710542A (en) * | 2014-12-01 | 2016-06-29 | 鞍钢股份有限公司 | Method for preventing medium-high carbon steel composite welding cracks from generating |
| CN105772926A (en) * | 2016-05-16 | 2016-07-20 | 上海中希合金有限公司 | Production method for precious/cheap metal penetration composite strip material |
| CN105855685A (en) * | 2015-01-23 | 2016-08-17 | 鞍钢股份有限公司 | Method for producing extra-thick plate by vacuum electron beam horizontal hybrid welding |
| CN106695102A (en) * | 2015-11-17 | 2017-05-24 | 鞍钢股份有限公司 | Vacuum electronic welding method for ferromagnetic steel ultra-thick composite plate |
| CN107253020A (en) * | 2017-05-23 | 2017-10-17 | 舞阳钢铁有限责任公司 | A kind of production method of big thickness 45# steel plates |
| CN107326164A (en) * | 2017-05-23 | 2017-11-07 | 舞阳钢铁有限责任公司 | A kind of production method of big thickness 690MPa high strength steel plates |
| CN108381027A (en) * | 2018-02-11 | 2018-08-10 | 东北大学 | It is used to prepare the vacuum welding device and preparation method thereof of carbon equivalent high super-thick steel plate |
| CN109128691A (en) * | 2018-10-26 | 2019-01-04 | 山东钢铁集团日照有限公司 | A kind of preparation process of the compound slab of high-carbon high-alloy steel plate |
| CN109570856A (en) * | 2018-12-18 | 2019-04-05 | 天长市天翔集团有限公司 | Welder is used in a kind of processing of automobile |
| CN110449721A (en) * | 2019-07-26 | 2019-11-15 | 南京理工大学 | It is a kind of to preheat the electro-beam welding method for reducing workpiece welding deformation by real-time multi-beam |
| CN110586648A (en) * | 2019-09-06 | 2019-12-20 | 鞍钢股份有限公司 | Anti-weld crack rolling method for high-carbon equivalent composite blank |
| CN111761195A (en) * | 2020-06-10 | 2020-10-13 | 中国船舶重工集团公司第七二五研究所 | Vacuum preheating electron beam welding device for pressure-resistant shell |
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| CN101439348A (en) * | 2008-12-29 | 2009-05-27 | 济南钢铁股份有限公司 | Technological process for producing super-thick plate |
| CN101773931A (en) * | 2009-12-30 | 2010-07-14 | 东北大学 | Method for rolling special thick board by means of vacuum compositing |
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| CN101328567A (en) * | 2008-07-28 | 2008-12-24 | 中国航空工业第一集团公司北京航空制造工程研究所 | Double electron beam partial heat treatment method after refractory metal material is welded |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105710542B (en) * | 2014-12-01 | 2019-03-26 | 鞍钢股份有限公司 | Method for preventing medium-high carbon steel composite welding cracks from generating |
| CN105710542A (en) * | 2014-12-01 | 2016-06-29 | 鞍钢股份有限公司 | Method for preventing medium-high carbon steel composite welding cracks from generating |
| CN105855685A (en) * | 2015-01-23 | 2016-08-17 | 鞍钢股份有限公司 | Method for producing extra-thick plate by vacuum electron beam horizontal hybrid welding |
| CN106695102A (en) * | 2015-11-17 | 2017-05-24 | 鞍钢股份有限公司 | Vacuum electronic welding method for ferromagnetic steel ultra-thick composite plate |
| CN106695102B (en) * | 2015-11-17 | 2018-12-04 | 鞍钢股份有限公司 | Vacuum electronic welding method for ferromagnetic steel ultra-thick composite plate |
| CN105772926A (en) * | 2016-05-16 | 2016-07-20 | 上海中希合金有限公司 | Production method for precious/cheap metal penetration composite strip material |
| CN107253020A (en) * | 2017-05-23 | 2017-10-17 | 舞阳钢铁有限责任公司 | A kind of production method of big thickness 45# steel plates |
| CN107326164A (en) * | 2017-05-23 | 2017-11-07 | 舞阳钢铁有限责任公司 | A kind of production method of big thickness 690MPa high strength steel plates |
| CN108381027A (en) * | 2018-02-11 | 2018-08-10 | 东北大学 | It is used to prepare the vacuum welding device and preparation method thereof of carbon equivalent high super-thick steel plate |
| CN109128691A (en) * | 2018-10-26 | 2019-01-04 | 山东钢铁集团日照有限公司 | A kind of preparation process of the compound slab of high-carbon high-alloy steel plate |
| CN109128691B (en) * | 2018-10-26 | 2020-11-06 | 山东钢铁集团日照有限公司 | Preparation process of composite casting blank for high-carbon high-alloy steel plate |
| CN109570856A (en) * | 2018-12-18 | 2019-04-05 | 天长市天翔集团有限公司 | Welder is used in a kind of processing of automobile |
| CN110449721A (en) * | 2019-07-26 | 2019-11-15 | 南京理工大学 | It is a kind of to preheat the electro-beam welding method for reducing workpiece welding deformation by real-time multi-beam |
| CN110586648A (en) * | 2019-09-06 | 2019-12-20 | 鞍钢股份有限公司 | Anti-weld crack rolling method for high-carbon equivalent composite blank |
| CN111761195A (en) * | 2020-06-10 | 2020-10-13 | 中国船舶重工集团公司第七二五研究所 | Vacuum preheating electron beam welding device for pressure-resistant shell |
| CN111761195B (en) * | 2020-06-10 | 2021-08-20 | 中国船舶重工集团公司第七二五研究所 | Vacuum preheating electron beam welding device for pressure-resistant shell |
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Application publication date: 20130410 |