CN1216174C - Low-carbon silicon steel strip for cold rolling and producting process thereof - Google Patents
Low-carbon silicon steel strip for cold rolling and producting process thereof Download PDFInfo
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- CN1216174C CN1216174C CN 02139839 CN02139839A CN1216174C CN 1216174 C CN1216174 C CN 1216174C CN 02139839 CN02139839 CN 02139839 CN 02139839 A CN02139839 A CN 02139839A CN 1216174 C CN1216174 C CN 1216174C
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Abstract
The present invention discloses a low-carbon low-silicon hot rolled steel strip for cold rolling and a production process thereof. The chemical components of the steel strip belong to the component category of rimmed steel and comprises 0.02 to 0.09% of carbon content, 0.01 to 0.10% of silicon content, 0.20 to 0.60% of manganese content, 0.005 to 0.04% of phosphorus content, and 0.005 to 0.04% of sulfur content. The steel strip belongs to low-carbon low-silicon steel which is difficult to produce, and needs producing according to a killed steel continuous casting process. A 90-ton oxygen convertor is adopted to carry out the top bottom blowing and smelting, ladles are used for blowing argon in the whole course, little silicon is used, proper amount of aluminium wires are used for the molten steel deoxidation, a medium ladle submerged entry nozzle is adopted to protect the residue casting, the liquid height of the molten steel is above 100mm, a weak cooling system is used for the secondary cooling, and the continuous casting pulling rate and the temperatures of sections in a heating furnace are well controlled in the rolling process. The steel strip has good high-plasticity, low intensity and good cold rolling extension performance, continuous cold rolling can be carried out without annealing, and the steel strip meets market demands.
Description
Technical field
The present invention relates to a kind of steel band production technique, relate in particular to a kind of cold rolling with low carbon low silicon steel band production technique.
Background technology
At present regular smelter, still adopt ingot mold molten steel to be molded into the steel ingot of certain geometrical dimension for smelting the low rimming steel of carbon silicomanganese content that comes out from electric furnace or converter (especially converter), rolling becoming a useful person after the blooming mill cogging again, this is called die casting---steel rolling process.But the maximum deficiency of this die casting process is that the lumber recovery from the ingot to the material is low, the cost height, and the quality of material is also undesirable, and subject matter is to exist hardness higher, and cold rolling cracking phenomena is exactly like this as Q195 band steel.Then adopt converter smelting " sequence casting " production technique for killed steel, one-heating forming saves the cogging technics program.From documents and materials to iron and steel behavior present situation, the rimming steel continuous casting remains a difficult problem that is not resolved, therefore, smelt and adopt the rimming steel composition, and produce by the killed steel continuous casting process, to obtain having good high-ductility performance, low strength and cold rolling ductility, not needing annealed again can continuous cold rolling be the problem that the steel industry scientific and technical personnel need solve.
Summary of the invention
The objective of the invention is to market provide a kind of can satisfy steel band cold working needs, stable performance, steel billet material not the direct continuous cold rolling of the annealed energy of needs, once shaped, cold working draught reach efficient height, the cold rolling low carbon low silicon steel band of using that lumber recovery is high greatly, the present invention simultaneously also provides Chemical Composition scope such as a kind of carbon silicomanganese in fact to belong to rimming steel composition category, produce cold rolling production technique with the low carbon low silicon steel band by the killed steel continuous casting process.
For achieving the above object, this has the technical scheme of employing to be:
1, according to customer requirements, need not anneal to steel band and can carry out cold working, the smelting composition that designs this kind steel requires (by weight) to be: carbon (C) 0.02～0.09%, silicon (Si) 0.01～0.10%, manganese (Mn) 0.20～0.60%, phosphorus (P) 0.005～0.040%, sulphur (S) 0.005～0.040%, aluminium (Al) 0.002～0.050%, nitrogen (N) 0.01～0.08%, oxygen (O) 0.01～0.08%, all the other are iron (Fe), as seen, such carbon (C), silicon (Si), manganese (Mn) content range is actually rimming steel composition category, presses the production of killed steel continuous casting process.
2, according to customer requirements, at this performance that steel grade plasticity is good, intensity is low, its mechanical property design:
Yield strength (σ
s): 195～250MP
a
Tensile strength (σ
b): 270～400MP
a
Unit elongation (δ
5): 33～50%;
Clod wash: d=0, clod wash 180 degree.
3, technical process: according to " adopting low carbon low silicon rimming steel composition; press the killed steel explained hereafter ", melten iron in hot-metal mixer-90 ton oxygen coverter top bottom blowing smeltings-ladle omnidistance BOTTOM ARGON BLOWING-wire feeding deoxidising-check by continuous casting-steel billet, reconditioning-heat accumulating type step heating-furnace heats that-3/4 continuous mill is rolling becomes a useful person-product physicochemical property check-surface quality and dimensional inspection.
The cold rolling low carbon low silicon steel band of using that adopts as above technical scheme to produce, advantage shows: cold rollingly compare with the straight carbon steel band with the low carbon low silicon steel band, intensity is low, plasticity is high, cold rolling extension performance is good, uniform ingredients, stable performance, uniform crystal particles is tiny, and inclusion content is low, direct cold rolling does not ftracture but steel band need not be annealed, and has solved cold rolling cracking problem; Reduce steel band hardness, draught is big, has solved deoxidation and continuous casting problem; Roll speed is fast, can enhance productivity and lumber recovery; Nearly 400 yuan of ton material profit, to producing the metallurgy industry of 10～150,000 tons of low carbon low silicon steel bands a year, but every year about 2.5 hundred million yuan of new output values.
Embodiment
Below the specific embodiment of the present invention is described in further detail.
1, the cold rolling Chemical Composition with the low carbon low silicon steel band that the present invention is described is designed to (by weight):
Carbon (C) 0.02～0.09%, silicon (Si) 0.01～0.10%, manganese (Mn) 0.20～0.60%, phosphorus (P) 0.005～0.040%, sulphur (S) 0.005～0.040%, aluminium (Al) 0.002～0.050%, nitrogen (N) 0.01～0.08%, oxygen (O) 0.01～0.08%, all the other are iron (Fe) 98.92～99.738%.
The cold rolling mechanical property with the low carbon low silicon steel band that the present invention describes is designed to: yield strength (σ
s): 195～250Mpa, tensile strength (σ
b): 270～400Mpa; Unit elongation (δ
5): 33～50%; Clod wash: d=0, clod wash 180 degree.
2, smelt: on 90 tons of oxygen coverters, adopt the top bottom blowing technological operation, require converter molten iron [P]＜0.10%, [S]＜0.04%, basicity (CaO/SiO
2) R=3.0～3.5, morningization slag dephosphorization (P), sulphur (S).Terminal point control when molten steel is come out of the stove: [C]=0.04～0.06%, [P]≤0.020%, [S]≤0.025%.Adopt slag-blocking ball or slag retaining cap pushing off the slag tapping, strict control is the quantity of slag down.Tapping time 〉=2.5 minute.In tapping process, add mid-carbon fe-mn 1.0～1.2kg/t to ladle
Steel(80～110kg/ stove), add aluminium manganese 3kg/t
Steel(250kg/ stove), add Si-Ba alloy 0.9kg/t
Steel(80kg/ stove) carries out molten steel alloying and deoxidation.When end point carbon (C) was 0.02～0.03%, ferrosilicoaluminum 10～30kg/ stove was appended in tapping.The alloy joining day begins when having gone out 1/4 molten steel to add, and adds when having gone out 3/4 molten steel; According to oxygen level in the molten steel (p.p.m), in molten steel, feed aluminium wire earlier, and then feed the silico-calcium silk.Aluminium wire or silico-calcium silk are 10 millimeters of φ, and its quantity is controlled at: when oxygen level in the molten steel during at 21～60p.p.m, do not feed aluminium wire, feed 300～550 meters of silico-calcium silks; When oxygen level in the molten steel during at 60～200p.p.m, feed 10～100 meters of aluminium wires, feed 300～500 meters of silico-calcium silks; When oxygen level in the molten steel＞200p.p.m, feed 500～650 meters of silico-calcium silks, feed 100～120 meters of aluminium wires.Be that oxygen level in the molten steel (p.p.m) is high more, the aluminium wire or the silico-calcium silk of feeding in molten steel are many more.Feed silk back continuation Argon and began to decide oxygen in 3～6 minutes, decide oxygen 21～60p.p.m, temperature meets the requirements, and feeds the total Argon in silk back 4～6 minutes, decides oxygen again, mends as one sees fit and feeds aluminium wire or silico-calcium silk.
After going into ladle, molten steel wants omnidistance Argon (Ar), must not nitrogen flushing (N), must not add carbon dust.
3, continuous casting
Earlier the continuous casting tundish is toasted storing temperature＞800 ℃, storing time 4～5 hours.Tundish adopts 26 millimeters mouths of a river of φ.Adopt tundish to stretch into the covering slag casting of the formula mouth of a river, the liquid steel level height is controlled at 400～500mm, molten steel overheat is controlled at≤30 ℃ in.Weak cold system, the i.e. water yield≤0.8kg/kg steel are adopted in strand two cold water distributions when crystallizer comes out to enter two cold-zones.Continuously cast bloom pulling rate control: to 130 * 140mm
2Square billet, pulling rate≤1.6 meter/minute are to 150 * 150mm
2Square billet, pulling rate≤2.4 meter/minute.According to the liquid steel temperature height, can adjust 0.2 meter/minute.
4, rolling: the continuously cast bloom that will smelt, continuous casting becomes is delivered to Steel Mill, is rolled into the steel band of required geometrical dimension.
Heating-furnace temperature control: soaking zone temperature≤1290 ℃, heating zone temperature≤1300 ℃, the continuous casting steel billet Heating temperature is at 1080～1260 ℃, start rolling temperature must not be lower than 1050 ℃, finishing temperature 〉=900 ℃, coiling temperature 〉=650 ℃, the section geometrical dimension of the steel band that is rolled into is: 3.5 * 100mm; 3.5 * 150mm; 3.5 * 200mm; 5.0 * 150mm, 5.0 * 200mm; 5.0 * 400mm, 3 differences be 0.09～0.12mm (promptly ≯ 0.10 or ≯ 0.12 or ≯ 0.13mm).
To cold rollingly be transported to the user with the low carbon low silicon steel band by what as above production technique was produced, under without the annealed situation, broken belt or cracking phenomena do not appear in the cold-reduced sheet of once cold rolling to 0.7～0.8mm (band).
Embodiment 1
1, cold rolling with the contained composition of low carbon low silicon steel band (weight)
C＝0.06％，Si＝0.05％，Mn＝0.40％，P＝0.01％，S＝0.01％，
Al=0.009%, N=0.05%, O=0.05%, all the other are Fe.
2, its production technique is for as mentioned above.
Embodiment 2
1, cold rolling with the contained composition of low carbon low silicon steel band (weight)
C＝0.03％，Si＝0.02％，Mn＝0.30％，P＝0.008％，S＝0.008％，
Al=0.010%, N=0.02%, O=0.03%, all the other are Fe.
2, its production technique is for as mentioned above.
Embodiment 3
1, cold rolling with the contained composition of low carbon low silicon steel band (weight)
C=0.08%, Si=0.09%, Mn=0.50%, P=0.035%, S=0.035%, Al=0.040%, N=0.07%, O=0.07%, all the other are Fe.
2, its production technique is for as mentioned above.
Claims (1)
1, a kind of cold rolling with low carbon low silicon steel band production technique, it is characterized in that: the oxygen coverter top bottom blowing is smelted, go into stove molten iron [P]＜0.10%, [S]＜0.040%, basicity R=3.0～3.5, terminal point control when molten steel is come out of the stove: [C]=0.04～0.06%, [P]≤0.020%, [S]≤0.025% add mid-carbon fe-mn 1.0～1.2kg/t steel, add aluminium manganese 3kg/t steel, add Si-Ba alloy 0.9kg/t steel to ladle in tapping process; When end point carbon [C] was 0.02～0.03%, ferrosilicoaluminum 10～30kg/ stove was appended in tapping; The alloy joining day begins when having gone out 1/4 molten steel to add, and adds when having gone out 3/4 molten steel;
When oxygen level in the molten steel during at 21～60p.p.m, do not feed aluminium wire, feed 300～550 meters of silico-calcium silks, when oxygen level in the molten steel during, feed 10～100 meters of aluminium wires at 60～200p.p.m, feed 300～500 meters of silico-calcium silks; When oxygen level in the molten steel＞200p.p.m, feed 500～650 meters of silico-calcium silks, feed 100～120 meters of aluminium wires; Feed silk back continuation Argon and began to decide oxygen in 3～6 minutes, decide oxygen 21～60p.p.m, temperature meets the requirements, and feeds the total Argon in silk back 4～6 minutes, decides oxygen again, mends as one sees fit and feeds aluminium wire or silico-calcium silk;
Adopt tundish to stretch into the covering slag casting of the formula mouth of a river, the liquid steel level height is controlled at 400～500 millimeters, and in molten steel overheat≤30 ℃, weak cold system, the water yield≤0.8kg/kg steel are adopted in two cold water distributions; To 130 * 140mm
2Square billet, continuous casting pulling rate≤1.6 meter/minute are to 150 * 150mm
2Square billet, continuous casting pulling rate≤2.4 meter/minute;
The heating-furnace temperature control: soaking zone temperature≤1290 ℃, heating zone temperature≤1300 ℃, the continuous casting steel billet Heating temperature is at 1080～1260 ℃; Start rolling temperature must not be lower than 1050 ℃, finishing temperature 〉=900 ℃, coiling temperature 〉=650 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02139839 CN1216174C (en) | 2002-12-13 | 2002-12-13 | Low-carbon silicon steel strip for cold rolling and producting process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02139839 CN1216174C (en) | 2002-12-13 | 2002-12-13 | Low-carbon silicon steel strip for cold rolling and producting process thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1508276A CN1508276A (en) | 2004-06-30 |
| CN1216174C true CN1216174C (en) | 2005-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02139839 Expired - Fee Related CN1216174C (en) | 2002-12-13 | 2002-12-13 | Low-carbon silicon steel strip for cold rolling and producting process thereof |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100436627C (en) * | 2006-02-11 | 2008-11-26 | 湖南华菱涟源钢铁有限公司 | Process for producing C-Mn-Al killed steel |
| CN100411758C (en) * | 2006-06-06 | 2008-08-20 | 湖南华菱涟源钢铁有限公司 | A method for making semi-processed cold rolled silicon steel in thin slab continuous casting and continuous rolling process |
| KR100982382B1 (en) * | 2009-04-30 | 2010-09-14 | 삼성전자주식회사 | Thin film transistor liquid crystal display device |
| KR100982387B1 (en) * | 2009-04-30 | 2010-09-14 | 삼성전자주식회사 | Bottom chassis for thin film transistor liquid crystal display device |
| CN103205629A (en) * | 2013-03-26 | 2013-07-17 | 浙江龙盛薄板有限公司 | High-hardness steel belt for home appliances and manufacturing method |
| CN103952636B (en) * | 2014-05-20 | 2016-08-24 | 唐山瑞丰钢铁（集团）有限公司 | Cold rolling hot dip galvanizing hot-strip production technology |
| 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 |
| CN109666854A (en) * | 2019-01-15 | 2019-04-23 | 舞阳钢铁有限责任公司 | A kind of smelting process of mild steel |
| CN110396647B (en) * | 2019-08-22 | 2020-09-08 | 中天钢铁集团有限公司 | Low-alloy steel with high electromagnetic performance and high strength, production process and application thereof |
| CN114395735A (en) * | 2022-01-07 | 2022-04-26 | 上海大学 | Corrosion-resistant Q195 steel and preparation method thereof |
| CN114574766B (en) * | 2022-03-04 | 2023-04-11 | 武安市裕华钢铁有限公司 | Ni-RE series corrosion-resistant low-carbon hot-rolled steel strip and production process thereof |
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Granted publication date: 20050824 Termination date: 20111213 |