CN103160666A - Method for manufacturing low-cost super-thick steel plate in short process - Google Patents
Method for manufacturing low-cost super-thick steel plate in short process Download PDFInfo
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- CN103160666A CN103160666A CN2011104185357A CN201110418535A CN103160666A CN 103160666 A CN103160666 A CN 103160666A CN 2011104185357 A CN2011104185357 A CN 2011104185357A CN 201110418535 A CN201110418535 A CN 201110418535A CN 103160666 A CN103160666 A CN 103160666A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 39
- 239000010959 steel Substances 0.000 title claims abstract description 39
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000005096 rolling process Methods 0.000 claims abstract description 46
- 238000010438 heat treatment Methods 0.000 claims abstract description 28
- 238000003466 welding Methods 0.000 claims abstract description 21
- 230000006835 compression Effects 0.000 claims abstract description 14
- 238000007906 compression Methods 0.000 claims abstract description 14
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 238000010583 slow cooling Methods 0.000 claims abstract description 6
- 238000002791 soaking Methods 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims abstract description 4
- 238000003723 Smelting Methods 0.000 claims abstract description 3
- RMLPZKRPSQVRAB-UHFFFAOYSA-N tris(3-methylphenyl) phosphate Chemical compound CC1=CC=CC(OP(=O)(OC=2C=C(C)C=CC=2)OC=2C=C(C)C=CC=2)=C1 RMLPZKRPSQVRAB-UHFFFAOYSA-N 0.000 claims abstract description 3
- 238000005520 cutting process Methods 0.000 claims abstract 2
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- 238000009413 insulation Methods 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 2
- 238000009749 continuous casting Methods 0.000 claims description 2
- 239000013078 crystal Substances 0.000 claims description 2
- 238000007670 refining Methods 0.000 claims description 2
- 238000007669 thermal treatment Methods 0.000 claims description 2
- 238000005265 energy consumption Methods 0.000 abstract description 7
- 230000033764 rhythmic process Effects 0.000 abstract description 6
- 238000005266 casting Methods 0.000 abstract description 2
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- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
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- 238000005516 engineering process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
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- 238000011160 research Methods 0.000 description 3
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- 229910052786 argon Inorganic materials 0.000 description 2
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- 230000002950 deficient Effects 0.000 description 2
- 238000004512 die casting Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000005272 metallurgy Methods 0.000 description 2
- 235000019362 perlite Nutrition 0.000 description 2
- 239000010451 perlite Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 229910000746 Structural steel Inorganic materials 0.000 description 1
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Abstract
The invention provides a method for manufacturing a low-cost super-thick steel plate in a short process, which comprises the steps of smelting, continuously casting, stacking for slow cooling after cutting, carrying out slow cooling for 20-30 hours, cleaning the surface and the side surface of a blank, and enabling the roughness to reach 6.3 mu m; after the two blanks are combined, vacuumizing and welding are carried out, and the thickness is 200-300 mm; sending the material to a walking beam type heating furnace, preheating at a slow heating speed, cold charging at 12-13 min/cm, heating at a normal speed, prolonging the heat preservation time of a soaking section for 0-30 min, and discharging at a temperature of more than or equal to 1100 ℃; after dephosphorization, direct rolling or TMCP rolling is adopted, the initial rolling temperature of rough rolling is more than or equal to 1050 ℃, the first pass reduction rate is more than or equal to 10 percent, and the accumulated reduction rate is more than or equal to 30 percent; and controlling the rolling temperature at the lower limit of the technological parameters and the compression ratio of 1.8-2.5, and performing air cooling or controlled cooling and heat treatment after rolling. The super-thick steel plate produced by the method with a smaller compression ratio has the advantages of good product quality, uniform performance, low energy consumption, quick rolling rhythm, suitability for industrial mass production and remarkable economic and social benefits.
Description
Technical field
The invention belongs to metallurgical technology field, relate to a kind of thickness in the production method of 80～150mm super-thick steel plate, especially adopt the production method of short process low energy consumption.
Background technology
Super-thick steel plate is as high-end, high added value kind in steel, and because its Application Areas is wide, the production technology difficulty is large, is for many years to be engaged in the focus of metallurgy industry personnel research and the focus that smelter is chased always.In China, the research of special heavy plate is started late, particularly the steel plate of finished product thickness more than 80mm.Due to the fast development in the fields such as the manufacturing of China's every profession and trade such as big machinery and structure in recent years, military project, shipbuilding, boiler vessel, deep-sea oil exploitation equipment, nuclear power, also increasing to the demand of the steel plate of the thick specification of spy.But there is very large technical difficulty in the steel plate of producing this class specification, and this class steel plate of present China is main dependence on import still.
In view of important and the can not be substituted property of steel plate in all conglomerate construction of this thickness specification, more domestic smelters are also more and more recognized its importance, drop into a large amount of manpower and materials and study.On effect, adopt the thick continuously cast bloom of 300mm to produce the following super-thick steel plate of thickness 80mm and can also guarantee lumber recovery, 80mm above because compression ratio is inadequate, performance can't meet the demands, lumber recovery is very low; Adopt the die casting mode to produce large steel ingot, then carry out forging rolling and produce thick steel plates, because the internal soundness of ingot casting is poor, not only need very large compression ratio when rolling, and the very difficult assurance of the flaw detection of finished steel plate, lumber recovery is low not to be said, rolling rhythm is also very slow, has seriously restricted production capacity; Though adopt the electroslag mode greatly to eliminate the internal soundness defective, have that energy consumption is large, with serious pollution problem, efficient is low and be not suitable for producing in enormous quantities.Adopting compound ply rolling mode to produce special heavy plate is the more feasible mode of production, and not only lumber recovery is high, and has improved the internal soundness of steel.Even but present research generally believes that compound ply rolling will adopt relatively large compression ratio (generally more than 3) could produce the special heavy plate below 150mm equally.Such combination sotck thinkness is also at least more than 300mm, and the walking beam heating furnace by routine can't heat.Need to heat guarantee heart section temperature by batch-type furnace, and then guarantee the syncretizing effect of compound interface.And batch-type furnace heating energy consumption is generally 1.5～2 times of the walking beam heating furnace energy consumption, and batch-type furnace heating assembly needs lifting, and technique is very loaded down with trivial details, simultaneously because thickness is large, heating and come out of the stove after difference variation can affect steel-plate shape, reduce quality product, affect production efficiency.
" a kind of producing super-thick plate by packrolling welding process method " patent (publication number CN 102009332A) adopts argon arc welding mode soldering and sealing steel plate surrounding, but use the weld penetration of argon arc welding welding more shallow, during industrial production, under very large rolling load effect, composite billet is easy to split in the commissure mistake, can't be fully compound.
" low-alloy high-tensile structural steel Q460C special heavy plate and production method thereof " patent (publication number CN 102041438A) uses the die casting mode to produce the steel ingot of mean thickness 890mm, the average compression ratio that adopts is 7.4, need to consume a large amount of abilities when not only heating before rolling, and lumber recovery is low.
" a kind of method of rolling special thick board by means of vacuum compositing " patent (publication number CN 101773931A) adopts resistance furnace heating combination blank, resistance furnace not only cost is high, and can not utilize the self-produced coal gas of metallurgy industry to heat, further increased production cost, the compression ratio of this invention has reached 5.4 in addition.
" vacuum electron beam welding method " patent (publication number CN 101590596A) adopts the continuously cast bloom vacuum seal of two thickness 300mm to produce the steel plate of thickness 150mm, compression ratio is 4, not only need during heating to consume a large amount of heat energy, and reduced rolling rhythm, reduced production efficiency.
Summary of the invention
The object of the invention is to overcome the existing defective of above-mentioned prior art, provide that a kind of required energy consumption is little, the method for the low-cost super-thick steel plate of short flow manufacturing of good product quality.
The concrete production technique of the low-cost super-thick steel plate of the short flow manufacturing of the present invention is as follows:
1) the low-alloy steel grade of raw material choose carbon equivalent≤0.45%, after converter smelting, the refining of LF stove, VD or RH process, basket pouring, continuous casting goes out that surface quality is good, center equiaxial crystal ratio＞10%, planeness≤1.0mm/mm
2The high-quality slab.
2) strand that rolls off the production line cuts along its length, and dimensions: width is that 900～2300mm, thickness are 100～150mm.To cut rear blank and carry out stacking slow cooling, the blank insulation is noted in slow cooling 20～30 hours simultaneously.After insulation, blank is carried out surface and side clearing up and processing, and guarantee that the surface is the continuously cast bloom extrados, its roughness reaches 6.3 μ m.
3) will process after two compact material surperficial involutory, and enter that vacuum chamber vacuumizes and electrons leaves welding, require vacuum tightness＜7.5 * 10
-2Pa, acceleration voltage 80～100kV, strength of current 100～150mA, welding speed 200～400mm/min, the thickness of combination base is 200～300mm.
4) the combination base of completing soldering and sealing is sent into the walking beam heating furnace heating through roller-way, and heating is through preheating, heating, three stages of insulation.Pre-thermal recovery rate of heating slowly wherein, cold charge is controlled at 12～13min/cm; The heating zone rate of heating adopts constant speed; The soaking zone soaking time extends 0～30min according to steel grade, and composite surface is fully healed.The extractor quick tapping, tapping temperature 〉=1100 ℃, roller-way send subsequent processing fast.
5) the combination base is after dephosphorization, and feed mill is rolling, according to the process requirements of steel grade can adopt Direct Rolling or TMCP rolling, but no matter Direct Rolling or controlled rolling recrystallize rolling sequence, need guarantee that all high temperature is rolling at a slow speed, roughing start rolling temperature 〉=1050 ℃, first percentage pass reduction 〉=10%, after milling train, rapid adjustment rhythm carries out lower a time rolling, makes blank rolling at higher temperature all the time, roughing finishing temperature 〉=900 ℃, accumulative total draft 〉=30%.Finish rolling open rolling finishing temperature is tried one's best controlled rolling at each steel grade processing parameter lower limit, and compression ratio is set according to finished product thickness, but maximum compression ratio is controlled at 2.5, more conference reduces rolling rhythm, affect production efficiency, minimum is controlled at 1.8, and more the small reduction ratio current technology realizes difficulty.Roll rear air cooling or control cold and thermal treatment according to the plate property needs at last.
The present invention with the combination base by walking beam heating furnace heat, with the super-thick steel plate good product quality that 1.8～2.5 less compression ratios are produced, performance is even, energy consumption is low, rolling rhythm is fast, suitable industrialized production, economic and social benefit is remarkable.
Description of drawings
Fig. 1 is the embodiment of the present invention 1 steel plate 1/4 place metallographic structure.
Fig. 2 is the embodiment of the present invention 2 steel plate 1/4 place metallographic structures.
Fig. 3 is the embodiment of the present invention 2 steel plate 1/2 place metallographic structures.
Embodiment
The present invention is further illustrated below by embodiment.
Embodiment 1
This embodiment of the invention selects 2 blocks of thick Q235B continuously cast blooms of 120mm to carry out removing surface, is also that the strand extrados carries out machining to face of weld, more than roughness reaches 6.3 μ m.Then 2 block weldings are pushed the pre-thermo-welding of vacuum chamber in the face of neat combination base, welding booth's vacuum tightness is 1.5 * 10
-2Mpa, acceleration voltage are that 100kV, welding current are that 120mA, welding speed are 250mm/min.Postwelding combination base is sent into walking beam heating furnace by roller-way and is heated, preheating section rate of heating 12min/cm, and soaking zone extends 15min, and all be 4.5 hours heat-up time, and 1148 ℃ of tapping temperatures are sent into subsequent processing fast by roller-way.The rough rolling step start rolling temperature is 1100 ℃, and first percentage pass reduction is 11%, and one-phase accumulative total draft is 31%; The finish rolling start rolling temperature is 940 ℃, and finishing temperature is 880 ℃, and compression ratio is 2.5, rolls rear air cooling.The finished steel plate final thickness is 92mm, reaches JB/T4730.3-2005 standard I level level through UT (Ultrasonic Testing).Embodiment chemical composition, mechanical property are as shown in table 1 and table 2.Result shows that its performance all satisfies the national standard requirement of this steel grade.The metallographic structure of steel plate is ferrite+perlite, as depicted in figs. 1 and 2.
Embodiment 2
This embodiment of the invention selects the continuously cast bloom of 2 thick Q345D of 150mm to carry out removing surface, is also that the strand extrados carries out machining to face of weld, more than roughness reaches 6.3 μ m.Then 2 block weldings are pushed the pre-thermo-welding of vacuum chamber in the face of neat combination base, welding booth's vacuum tightness is 2.0 * 10
-2Mpa, acceleration voltage are that 100kV, welding current are that 120mA, welding speed are 200mm/min.Postwelding combination base is sent into walking beam heating furnace by roller-way and is heated, preheating section rate of heating 13min/cm, and soaking zone extends 25min, and all be 6 hours heat-up time, and 1186 ℃ of tapping temperatures flow to subsequent processing fast by roller-way.The rough rolling step start rolling temperature is 1100 ℃, and first percentage pass reduction is 10%, and one-phase accumulative total draft is 30%; The finish rolling start rolling temperature is 890 ℃, and finishing temperature is 820 ℃, and compression ratio is 2, rolls rear air cooling.The finished steel plate final thickness is 145mm, reaches JB/T4730.3-2005 standard I level level through UT (Ultrasonic Testing).Embodiment chemical composition, mechanical property as shown in Table 1 and Table 2, result shows that its performance all satisfies the national standard requirement of this steel grade.The metallographic structure of steel plate is ferrite+perlite, as shown in Figures 2 and 3.
Table 1 embodiment of the present invention chemical composition (wt, %)
| Embodiment | C | Si | Mn | P | S | Cr | Nb | V | Ti | Ni | ALs |
| 1 | 0.13 | 0.28 | 1.05 | 0.016 | 0.003 | - | - | - | - | - | - |
| 2 | 0.14 | 0.35 | 1.45 | 0.017 | 0.003 | 0.1 | 0.035 | 0.056 | 0.005 | 0.12 | 0.015 |
Table 2 embodiment of the present invention mechanical property
Claims (3)
1. the method for the low-cost super-thick steel plate of one kind short flow manufacturing is characterized in that selecting the general carbon low alloy steel of carbon equivalent≤0.45%, and after converter smelting, the refining of LF stove, VD or RH processed, continuous casting became slab; Stacking slow cooling after the slab cutting, slow cooling 20～30 hours to blank surface, is also that continuously cast bloom extrados and side are cleared up after insulation, makes surfaceness reach 6.3 μ m; Vacuumize and electrons leaves welding after two compact material surperficial involutory, combination base thickness is 200～300mm; The combination base is sent into walking beam heating furnace through roller-way, and pre-thermal recovery is rate of heating slowly, and cold charge is controlled at 12～13min/cm, and the heating zone rate of heating adopts constant speed, soaking zone holding time 0～30min, tapping temperature 〉=1100 ℃; The combination base is after dephosphorization, and feed mill is rolling, adopts Direct Rolling or TMCP rolling, roughing start rolling temperature 〉=1050 ℃, roughing finishing temperature 〉=900 ℃, first percentage pass reduction 〉=10%, accumulative total draft 〉=30%; The controlled rolling of finish rolling open rolling finishing temperature is at each steel grade processing parameter lower limit, and compression ratio is controlled at 1.8～2.5, rolls rear air cooling or controls cold and thermal treatment.
2. the method for the low-cost super-thick steel plate of short flow manufacturing according to claim 1 is characterized in that the center equiaxial crystal ratio of described slab＞10%, planeness≤1.0mm/mm
2, width is that 900～2300mm, thickness are 100～150mm.
3. the method for the low-cost super-thick steel plate of short flow manufacturing according to claim 1, is characterized in that the described vacuum tightness that vacuumizes＜7.5 * 10
-2Pa; Acceleration voltage 80～the 100kV of described electrons leaves welding, strength of current 100～150mA, welding speed 200～400mm/min.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104971960A (en) * | 2014-04-10 | 2015-10-14 | 鞍钢股份有限公司 | Method for producing super-thick steel plate by three-dimensional deformation of continuous casting billet |
| CN105312842A (en) * | 2014-07-16 | 2016-02-10 | 鞍钢股份有限公司 | Manufacturing method of super-thick steel plate with excellent Z-direction performance |
| CN105714062A (en) * | 2014-12-01 | 2016-06-29 | 鞍钢股份有限公司 | Production method of high-strength extra-thick boiler drum steel plate |
| CN105710152A (en) * | 2014-12-01 | 2016-06-29 | 鞍钢股份有限公司 | Production method of steel plate for ultra-thick hydrogen-contacting equipment |
| CN106311746A (en) * | 2015-06-16 | 2017-01-11 | 鞍钢股份有限公司 | Production method of super-thick steel plate |
| CN108941494A (en) * | 2018-09-25 | 2018-12-07 | 湖南华菱湘潭钢铁有限公司 | A kind of Process of Hot Transfering And Hot Charging of cut deal continuous casting billet |
| CN111974812A (en) * | 2020-07-09 | 2020-11-24 | 南京钢铁股份有限公司 | Production method of super-thick steel plate |
| 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 |
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- 2011-12-14 CN CN2011104185357A patent/CN103160666A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101993987A (en) * | 2009-08-26 | 2011-03-30 | 鞍钢股份有限公司 | Method for producing extra-thick low-alloy high-strength steel plate by adopting continuous casting slab |
Non-Patent Citations (1)
| Title |
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| 骆宗安等: "特厚钢板复合轧制工艺的实验研究", 《塑性工程学报》, vol. 16, no. 4, 31 August 2009 (2009-08-31), pages 1 * |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104971960A (en) * | 2014-04-10 | 2015-10-14 | 鞍钢股份有限公司 | Method for producing super-thick steel plate by three-dimensional deformation of continuous casting billet |
| CN105312842A (en) * | 2014-07-16 | 2016-02-10 | 鞍钢股份有限公司 | Manufacturing method of super-thick steel plate with excellent Z-direction performance |
| CN105714062A (en) * | 2014-12-01 | 2016-06-29 | 鞍钢股份有限公司 | Production method of high-strength extra-thick boiler drum steel plate |
| CN105710152A (en) * | 2014-12-01 | 2016-06-29 | 鞍钢股份有限公司 | Production method of steel plate for ultra-thick hydrogen-contacting equipment |
| CN106311746A (en) * | 2015-06-16 | 2017-01-11 | 鞍钢股份有限公司 | Production method of super-thick steel plate |
| CN108941494A (en) * | 2018-09-25 | 2018-12-07 | 湖南华菱湘潭钢铁有限公司 | A kind of Process of Hot Transfering And Hot Charging of cut deal continuous casting billet |
| CN108941494B (en) * | 2018-09-25 | 2020-07-07 | 湖南华菱湘潭钢铁有限公司 | Hot-feeding and hot-charging process for medium-thickness plate continuous casting billet |
| CN111974812A (en) * | 2020-07-09 | 2020-11-24 | 南京钢铁股份有限公司 | Production method of super-thick steel plate |
| CN111974812B (en) * | 2020-07-09 | 2022-08-19 | 南京钢铁股份有限公司 | Production method of super-thick steel plate |
| 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 |
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Application publication date: 20130619 |