CN1970809A - 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
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- CN1970809A CN1970809A CN 200610098396 CN200610098396A CN1970809A CN 1970809 A CN1970809 A CN 1970809A CN 200610098396 CN200610098396 CN 200610098396 CN 200610098396 A CN200610098396 A CN 200610098396A CN 1970809 A CN1970809 A CN 1970809A
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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 the temperature of curling.
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 curling temperature range 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 curling temperature range 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:
| Steel grade | Specification | Chemical ingredients, % | |||||||
| C | Si | Mn | P | S | Al t | N | |||
| Embodiment 1 | DC04 | 1.5*1040 | 0.026 | 0.03 | 0.20 | 0.010 | 0.0041 | 0.042 | 0.0032 |
Table 2:
| Steel grade | Specification | Mechanical property (L 0＝80mm，b＝20mm) | |||||
| Rp 0.2，MPa | Rm，MPa | A 80，％ | n 90° | r 90° | |||
| Embodiment 1 | DC04 | 1.5*1040 | 155 | 290 | 44.0 | 0.222 | 2.03 |
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 curling temperature range 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:
| Steel grade | Specification | Chemical ingredients, % | |||||||
| C | Si | Mn | P | S | Al t | N | |||
| Embodiment 2 | DC04 | 1.5*1040 | 0.01 | 0.04 | 0.15 | 0.012 | 0.0038 | 0.05 | 0.0030 |
Table 4:
| Steel grade | Specification | Mechanical property (L 0＝80mm，b＝20mm) | |||||
| Rp 0.2，MPa | Rm，MPa | A 80，％ | n 90° | r 90° | |||
| Embodiment 2 | DC04 | 1.5*1040 | 155 | 295 | 44.0 | 0.213 | 2.58 |
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 curling temperature range 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:
| Steel grade | Specification | Chemical ingredients, % | |||||||
| C | Si | Mn | P | S | Al t | N | |||
| Embodiment 3 | DC04 | 1.5*1040 | 0.03 | 0.05 | 0.1 | 0.015 | 0.003 | 0.046 | 0.0030 |
Table 6:
| Steel grade | Specification | Mechanical property (L 0＝80mm，b＝20mm) | |||||
| Rp 0.2，MPa | Rm，MPa | A 80，％ | n 90° | r 90° | |||
| Embodiment 3 | DC04 | 1.5*1040 | 166 | 295 | 40.0 | 0.223 | 2.32 |
Claims (6)
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.
2, a kind of deep-draw level low carbon aluminum-killed steel plate production method based on CSP technology according to claim 1 is characterized in that: in CSP CSP operation, and rolling temperature: 1100～1150 ℃ of soaking temperatures; 900～950 ℃ of finishing temperatures; 530～580 ℃ of the temperature of curling.
3, a kind of deep-draw level low carbon aluminum-killed steel plate production method based on CSP technology according to claim 1 is characterized in that: 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%.
4, a kind of deep-draw level low carbon aluminum-killed steel plate production method based on CSP technology according to claim 1 is characterized in that: 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 curling temperature range then soon.
5, a kind of deep-draw level low carbon aluminum-killed steel plate production method based on CSP technology according to claim 1 is characterized in that: 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%.
6, a kind of deep-draw level low carbon aluminum-killed steel plate production method based on CSP technology according to claim 1 is characterized in that: described bell-type annealing operation: 710 ℃ of annealing furnace temperature; Annealing soaking time 8-10h; Smooth unit elongation 1.0%.
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| 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 |
| CN101892418A (en) * | 2010-09-01 | 2010-11-24 | 武汉钢铁(集团)公司 | Corrosion-resistant soft cold-rolling tin plate and production method thereof |
| CN102965487A (en) * | 2012-12-03 | 2013-03-13 | 安徽工业大学 | Preparation method of cold-rolled deep punching plate |
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| CN104120337B (en) * | 2014-07-16 | 2016-08-03 | 首钢总公司 | A kind of high r value think gauge IF automobile steel and production method thereof |
| CN104120337A (en) * | 2014-07-16 | 2014-10-29 | 首钢总公司 | High-r-value thick-specification IF automotive steel and production method thereof |
| 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 |
| CN104451377A (en) * | 2014-11-28 | 2015-03-25 | 首钢总公司 | Low-carbon aluminum killed steel hot-dip galvanized sheet and production method thereof |
| CN106906338A (en) * | 2015-12-23 | 2017-06-30 | 本钢板材股份有限公司 | A kind of method of raising DC01 strip elongation percentage qualification rates |
| 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 |
| CN106244921A (en) * | 2016-08-30 | 2016-12-21 | 武汉钢铁股份有限公司 | A kind of method producing line employing rolling in ferrite domains production mild steel at CSP |
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