CN100441722C - Process for producing deep-drawing Low-carbon aluminium-killed steel based on CSP technology - Google Patents
Process for producing deep-drawing Low-carbon aluminium-killed steel based on CSP technology Download PDFInfo
- Publication number
- CN100441722C CN100441722C CNB2006100983963A CN200610098396A CN100441722C CN 100441722 C CN100441722 C CN 100441722C CN B2006100983963 A CNB2006100983963 A CN B2006100983963A CN 200610098396 A CN200610098396 A CN 200610098396A CN 100441722 C CN100441722 C CN 100441722C
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- Prior art keywords
- csp
- rolling
- temperatures
- annealing
- steel
- Prior art date
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- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 16
- 229910000655 Killed steel Inorganic materials 0.000 title claims abstract description 7
- 238000005516 engineering process Methods 0.000 title claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 38
- 239000010959 steel Substances 0.000 claims abstract description 38
- 238000000137 annealing Methods 0.000 claims abstract description 26
- 238000005096 rolling process Methods 0.000 claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 claims abstract description 11
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 7
- 238000003723 Smelting Methods 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 3
- 238000002791 soaking Methods 0.000 claims description 19
- 238000005097 cold rolling Methods 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound 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[C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 101700044492 STD1 Proteins 0.000 claims description 5
- 101710017607 STD2 Proteins 0.000 claims description 5
- 239000004411 aluminium Substances 0.000 abstract description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminum Chemical compound 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[Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 5
- 238000005266 casting Methods 0.000 abstract 1
- 238000005554 pickling Methods 0.000 description 12
- 239000000203 mixture Substances 0.000 description 9
- 238000007670 refining Methods 0.000 description 9
- 238000005098 hot rolling Methods 0.000 description 6
- 238000002844 melting Methods 0.000 description 6
- 238000010079 rubber tapping Methods 0.000 description 6
- 238000009749 continuous casting Methods 0.000 description 5
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- PIGFYZPCRLYGLF-UHFFFAOYSA-N aluminum nitride Chemical compound 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[Al]#N PIGFYZPCRLYGLF-UHFFFAOYSA-N 0.000 description 1
- 229910001567 cementite Inorganic materials 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 229910000529 magnetic ferrite Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 235000019362 perlite Nutrition 0.000 description 1
- 239000010451 perlite Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 210000001519 tissues Anatomy 0.000 description 1
- 238000009941 weaving Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Abstract
The invention discloses a manufacturing method of deep-impaction low-carbon and aluminium killed steel board based on CSP technique, which comprises the following steps: smelting; casting thin board continuously; rolling; annealing at lid-type. The low-carbon smolten steel comprises the following parts: 0.01%<=C<=0.03%, 0.03%<=Si <=0.05%, 0.10%<=Mn<=0.20%, 0.010%<=P<=0.015%, S<=0.0045%, 0.04 %<=Als<=0.06%, N<=0.0045% and Fe and impurity.
Description
Technical field:
The invention belongs to this technical field of short flow process CSP (CSP) production method, relate in particular to a kind of this technical field of deep-draw level low carbon aluminum-killed steel plate production method.
Background technology:
At present, deep-draw (DDQ level) steel plate mainly comprises two big series: calm (AK) steel series of low-carbon (LC) (little carbon) aluminium and Ultra-low carbon gap-free atom (IF) steel series.In the hot rolling of ultra low carbon IF steel plate when evenly tiny crystal grain, annealing the thick sparse second phase particle and extremely low C, N interstitial atom solid solution capacity all help in the annealing process＜111 //development of ND texture, thereby improved the deep drawability of annealed sheet steel.Low-carbon (LC) AK steel mainly makes it separate out the development that helps γ silk weaving structure in a large number behind bell-type annealing by the solid solution of AlN in the control hot-rolled sheet, thereby has improved deep drawability.
Production about the bell-type annealing deep drawing sheet steel, generally adopt traditional technology (smelting-continuous casting and hot rolling-cold rolling-bell-type annealing) at present both at home and abroad, need when smelting, carry out dark decarburization and add Ti and (or) alloying element such as Nb, increased product cost with respect to low-carbon (LC) AK steel.
Summary of the invention:
Technical problem to be solved by this invention provides the low deep-draw level low carbon aluminum-killed steel plate production method based on CSP technology of a kind of cost.
The technical scheme of technical solution problem of the present invention is a kind of deep-draw level low carbon aluminum-killed steel plate production method based on CSP technology, comprise smelting procedure, CSP CSP operation, cold rolling process, bell-type annealing operation, used low-carbon (LC) molten steel weight item is in the described smelting procedure: 0.01%≤C≤0.03%; 0.03%≤Si≤0.05%; 0.10%≤Mn≤0.20%; 0.010%≤P≤0.015%; S≤0.0045%; 0.04%≤Al
s≤ 0.06%; N≤0.0045%; All the other are Fe and impurity element.
In CSP CSP operation, rolling temperature: 1100～1150 ℃ of soaking temperatures; 900～950 ℃ of finishing temperatures; 530～580 ℃ of coiling temperatures.
In CSP CSP operation, adopt 7 frame hot rollings, draft is F1:40～50% relatively; F2 ~ F3:30 ~ 37%; F4 ~ F5:15 ~ 25%; F6 ~ F7:10 ~ 18%.
In CSP CSP operation, hot rolling postcooling: adopt the multi-stage type controlled chilling, at first be cooled fast to 720～760 ℃ by finishing temperature; Naturally cooling 4～8s is as cold as the coiling temperature scope then soon.
Described cold rolling process is for adopting 4 frames cold rolling, and draft is STD1:30～37% relatively; STD2:35～40%; STD3:30～35%; STD4:0.1～0.5%;
Described bell-type annealing operation: 710 ℃ of annealing furnace temperature; Annealing soaking time 8-10h; Smooth unit elongation 1.0%.
The microstructure of the DDQ level low-carbon (LC) AK steel plate that the present invention produces is based on ferrite+small-amount free cementite, also may contain tissues such as a small amount of perlite simultaneously.
The present invention by sour molten aluminium and N content in the calm steel of strict control low-carbon (LC) aluminium within the specific limits, adopt the short flow process of CSP CSP to cooperate pickling, the cold rolling and calm cold-rolled steel sheet of other low-carbon (LC) aluminium of bell-type annealing explained hereafter deep-draw level, product performance surpass the relevant criterion requirement, reach: R
P0.2≤ 185MPa, R
m: 270～350MPa, A
80〉=40%, r
90〉=1.8, n
90〉=0.19.Compare with the production technique of traditional continuous casting, hot rolling flow process, because the CSP flow process is shorter, production efficiency improves greatly.
The present invention only need can realize at converter-RH refining-LF refining-CSP-pickling and cold-rolling-bell-type annealing equipment by the mentioned component scope; The cooperation of the reduction system of special use, temperature schedule, cooling system can be produced other low-carbon (LC) of DDQ level AK coil of strip more than adopting simultaneously.
The present invention compared with prior art adopt CSP CSP cooling to roll raw material and can produce DDQ level deep-draw low-carbon (LC) AK steel efficiently, cheaply, and performance can be applicable to automobile and other industries and carries out drawing above the relevant criterion requirement.
Embodiment:
It is 1040mm that embodiment of the invention CSP production line is about 400 meters, pickling and cold-rolling line length 250m, 39 annealing table, finished products volume width, thickness 1.5mm, 6.38 tons of maximum volume-weights.
Embodiment 1:
1, steel-making: steel melting furnace employing capacity is 120 tons converter, and tap is 125 tons, 1655 ℃ of tapping temperatures; The molten steel that steel melting furnace is come out carries out refining in ladle refining furnace, adopt ordinary methods such as intensification, composition adjustment, calcium processing, molten steel composition weight percent after refining finishes is controlled to be: C:0.026, Si:0.03, Mn:0.2, P:0.010, S:0.0041, Als:0.042,1610 ℃ of liquid steel temperatures.
2, continuous casting: 35 ℃ of molten steel overheats, adopt funnel-type crystallizer, this crystallizer is a hydraulic vibration, strand pulling rate 3.5m/min, slab thickness are 70mm.
3, soaking: strand enters soaking pit after cooling off through secondary cooling zone, and soaking pit length 268m, strand advance 930 ℃ of furnace temperatures, 1130 ℃ of tapping temperatures, strand residence time 30min.
4, hot continuous rolling: after strand went out soaking pit, removal showed that oxide skin enters 7 frame hot continuous rolling units through scale breaker, 1100 ℃ of start rolling temperatures, 910 ℃ of finishing temperatures, and rolling V-bar is about 800m/min, and hot rolling thickness is 2.7mm.Draft is F1:40% relatively; F2 ~ F3:30%; F4 ~ F5:15%; F6 ~ F7:10%.
5, batch: adopt the multi-stage type controlled chilling, at first be cooled to 720 ℃ by finishing temperature; Naturally cooling 4s is as cold as the coiling temperature scope then soon, and coiling temperature is 550 ℃.
6, pickling and cold-rolling: enter pickling tank after the hot rolled coil uncoiling, pickling speed 166m/min enters 4 frame tandem mills then, and draft is STD1:30% relatively; STD2:35%; STD3:30%; STD4:0.1%; Batch after cold rolling.
7, annealing and smooth: roll and involve in firmly into bell type annealing furnace, 710 ℃ of annealing temperatures, soaking time are 10h, smooth unit elongation 1.0%.
The DDQ composition of steel of present embodiment is as shown in table 1, and performance is as shown in table 2, has reached the performance requriements of DDQ level deep drawing steel.
Table 1:
Table 2:
Embodiment 2:
1, steel-making: steel melting furnace employing capacity is 120 tons converter, and tap is 125 tons, 1655 ℃ of tapping temperatures; The molten steel that steel melting furnace is come out carries out refining in ladle refining furnace, adopt ordinary methods such as intensification, composition adjustment, calcium processing, molten steel composition weight percent after refining finishes is controlled to be: C:0.01, Si:0.04, Mn:0.15, P:0.012, S:0.0038, Als:0.05,1610 ℃ of liquid steel temperatures.
2, continuous casting: 35 ℃ of molten steel overheats, adopt funnel-type crystallizer, this crystallizer is a hydraulic vibration, strand pulling rate 3.5m/min, slab thickness are 70mm.
3, soaking: strand enters soaking pit after cooling off through secondary cooling zone, and soaking pit length 268m, strand advance 935 ℃ of furnace temperatures, 1132 ℃ of tapping temperatures, strand residence time 30min.
4, hot continuous rolling: after strand went out soaking pit, removal showed that oxide skin enters 7 frame hot continuous rolling units through scale breaker, 1100 ℃ of start rolling temperatures, 930 ℃ of finishing temperatures, and rolling V-bar is about 800m/min, and hot rolling thickness is 3.6mm.Draft is F1:46% relatively; F2 ~ F3:33%; F4 ~ F5:19%; F6 ~ F7:14%.
5, batch: adopt the multi-stage type controlled chilling, at first be cooled to 740 ℃ by finishing temperature; Naturally cooling 6s is as cold as the coiling temperature scope then soon, and coiling temperature is 530 ℃.
6, pickling and cold-rolling: enter pickling tank after the hot rolled coil uncoiling, pickling speed 166m/min enters 4 frame tandem mills then, and draft is STD1:32% relatively; STD2:36%; STD3:31%; STD4:0.2%; Batch after cold rolling.
7, annealing and smooth: roll and involve in firmly into bell type annealing furnace, 710 ℃ of annealing temperatures, soaking time are 9h, smooth unit elongation 1.0%.
The DDQ composition of steel of present embodiment is as shown in table 3, and performance is as shown in table 4, has reached the performance requriements of DDQ level deep drawing steel.
Table 3:
Table 4:
Embodiment 3:
1, steel-making: steel melting furnace employing capacity is 120 tons converter, and tap is 125 tons, 1655 ℃ of tapping temperatures; The molten steel that steel melting furnace is come out carries out refining in ladle refining furnace, adopt ordinary methods such as intensification, composition adjustment, calcium processing, molten steel composition weight percent after refining finishes is controlled to be: C:0.03, Si:0.05, Mn:0.1, P:0.015, S:0.003, Als:0.046,1610 ℃ of liquid steel temperatures.
2, continuous casting: 35 ℃ of molten steel overheats, adopt funnel-type crystallizer, this crystallizer is a hydraulic vibration, strand pulling rate 3.5m/min, slab thickness are 70mm.
3, soaking: strand enters soaking pit after cooling off through secondary cooling zone, and soaking pit length 268m, strand advance 930 ℃ of furnace temperatures, 1130 ℃ of tapping temperatures, strand residence time 30min.
4, hot continuous rolling: after strand went out soaking pit, removal showed that oxide skin enters 7 frame hot continuous rolling units through scale breaker, 1150 ℃ of start rolling temperatures, 950 ℃ of finishing temperatures, and rolling V-bar is about 800m/min, and hot rolling thickness is 4mm.Draft is F1:50% relatively; F2 ~ F3:37%; F4 ~ F5:25%; F6 ~ F7:18%.
5, batch: adopt the multi-stage type controlled chilling, at first be cooled to 760 ℃ by finishing temperature; Naturally cooling 8s is as cold as the coiling temperature scope then soon, and coiling temperature is 580 ℃.
6, pickling and cold-rolling: enter pickling tank after the hot rolled coil uncoiling, pickling speed 166m/min enters 4 frame tandem mills then, and draft is STD1:37% relatively; STD2:40%; STD3:35%; STD4:0.5%; Batch after cold rolling.
7, annealing and smooth: roll and involve in firmly into bell type annealing furnace, 710 ℃ of annealing temperatures, soaking time are 8h, smooth unit elongation 1.0%.
The DDQ composition of steel of present embodiment is as shown in table 5, and performance is as shown in table 6, has reached the performance requriements of DDQ level deep drawing steel.
Table 5:
Table 6:
Claims (1)
1, a kind of deep-draw level low carbon aluminum-killed steel plate production method based on CSP technology, comprise smelting procedure, CSP CSP operation, cold rolling process, bell-type annealing operation, it is characterized in that: used low-carbon (LC) molten steel weight item is in the described smelting procedure: 0.01%≤C≤0.03%; 0.03%≤Si≤0.05%; 0.10%≤Mn≤0.20%; 0.010%≤P≤0.015%; S≤0.0045%; 0.04%≤Al
s≤ 0.06%; N≤0.0045%; All the other are Fe and impurity element;
In CSP CSP operation, rolling temperature: 1100～1150 ℃ of soaking temperatures; 900～950 ℃ of finishing temperatures; 530～580 ℃ of coiling temperatures;
Adopt 7 frame hot rollings, draft is F1:40～50% relatively; F2 ~ F3:30 ~ 37%; F4 ~ F5:15 ~ 25%; F6 ~ F7:10 ~ 18%;
Adopt the multi-stage type controlled chilling, at first be cooled fast to 720～760 ℃ by finishing temperature; Naturally cooling 4～8s is as cold as the coiling temperature scope then soon;
Described cold rolling process is for adopting 4 frames cold rolling, and draft is STD1:30～37% relatively; STD2:35～40%; STD3:30～35%; STD4:0.1～0.5%;
Described bell-type annealing operation: 710 ℃ of annealing furnace temperature; Annealing soaking time 8-10h; Smooth unit elongation 1.0%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNB2006100983963A CN100441722C (en) | 2006-12-18 | 2006-12-18 | Process for producing deep-drawing Low-carbon aluminium-killed steel based on CSP technology |
Applications Claiming Priority (1)
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| CN101736193B (en) * | 2008-11-10 | 2012-02-01 | 攀钢集团研究院有限公司 | Low carbon steel plate and preparation method thereof |
| CN101798655A (en) * | 2010-04-16 | 2010-08-11 | 北京科技大学 | Micro-carbon aluminum-killed steel with low yield ratio and good deep drawing property and preparation method thereof |
| CN101892418B (en) * | 2010-09-01 | 2011-12-21 | 武汉钢铁(集团)公司 | Corrosion-resistant soft cold-rolling tin plate and production method thereof |
| CN102965487B (en) * | 2012-12-03 | 2014-01-15 | 安徽工业大学 | Preparation method of cold-rolled deep punching plate |
| CN103602896B (en) * | 2013-12-06 | 2015-10-07 | 马钢(集团)控股有限公司 | A kind of production method of boracic tubulation steel band |
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| CN104264037A (en) * | 2014-09-16 | 2015-01-07 | 河北钢铁股份有限公司唐山分公司 | Low-carbon aluminium killed steel with excellent stamping properties and production method of low-carbon aluminium killed steel |
| CN104451377B (en) * | 2014-11-28 | 2016-09-28 | 首钢总公司 | A kind of carbon aluminium-killed steel heat zinc coating plate and production method thereof |
| CN106906338B (en) * | 2015-12-23 | 2018-12-21 | 本钢板材股份有限公司 | A method of improving DC01 strip elongation percentage qualification rate |
| CN106244921B (en) * | 2016-08-30 | 2018-05-01 | 武汉钢铁有限公司 | A kind of method in CSP producing lines using rolling in ferrite domains production mild steel |
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