CN100476006C - Smelting process of SPHD level cold rolled deep-drawing steel - Google Patents
Smelting process of SPHD level cold rolled deep-drawing steel Download PDFInfo
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- CN100476006C CN100476006C CNB2007100618199A CN200710061819A CN100476006C CN 100476006 C CN100476006 C CN 100476006C CN B2007100618199 A CNB2007100618199 A CN B2007100618199A CN 200710061819 A CN200710061819 A CN 200710061819A CN 100476006 C CN100476006 C CN 100476006C
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Abstract
The SPHD level cold rolled deep-drawing steel and its smelting process belongs to the field of smelting technology. The SPHD level cold rolled deep-drawing steel has chemical components including C not more than 0.10 wt%, Si not more than 0.03 wt%, Mn not more than 0.40 wt%.P not more than 0.015 wt%, S not more than 0.015 wt%, Als 0.015-0.065 wt%, and Fe for the rest. Its smelting process includes pre-treatment of molten iron, converter blowing, blowing argon and feeding wire, continuous plate blank casting and other steps. The SPHD level cold rolled deep-drawing steel has high expansibility and high deep-drawing performance.
Description
Technical field
Type of the present invention relates to a kind of soft steel smelting process, particularly is widely used in the cold rolling method for making steel with deep drawing steel of the SPHD level of making various deep-draw parts, belongs to the smelting iron and steel technical field.
Background technology
High speed development along with household electrical appliances, automobile, mechanical industry, high added value, variety steel demand high-quality, high technology content are increased day by day, exploitation, manufacturing deep drawing steel can provide good manufacturing raw material for related industries, also can be iron and steel enterprise simultaneously and have created good economic benefit.Cold rolling is a kind of sheet material that is widely used in automobile, appliance shell with deep drawing steel, and it has higher yield strength and good unit elongation, has higher requirement at aspects such as intensity, toughness, plasticity, aspect of performance such as extensible and dimensional precisioies.Development along with metallurgical technology and metallurgical production technology, provide wide development space for making SPHD level deep drawing steel, a lot of iron and steel enterprises competitively develop this series products, formed keen competition situation, therefore, continue to optimize composition proportion and production process, but develop aspect performance requriementss such as can satisfying intensity, toughness, plasticity deep-draw and make the easily cold rolling deep drawing steel of use of SPHD level of control of production process, be make that enterprise got the upper hand of in this type of product competition at all.
Summary of the invention
The present invention is used to provide the SPHD level cold rolling method for making steel with deep drawing steel, described steel grade distributes processing method when through being optimized to, but refinement band crystalline grain of steel tissue, be beneficial to oxide compound, be mingled with eliminating, improve the molten steel cleanliness factor, reinforcing band steel unit elongation and deep drawability, and the cc billet surface quality excellence and the production process of production are controlled easily.
The alleged problem of the present invention is that following technical scheme solves:
The cold rolling method for making steel of a kind of SPHD level with deep drawing steel, the chemical ingredients proportioning of this deep drawing steel is: C≤0.10%, Si≤0.03%, Mn≤0.40%, P :≤0.015%, S :≤0.015%, Als:0.015～0.065%, surplus are Fe, and its special feature is that it comprises following operation:
A. hot metal pretreatment: the passivated magnesium of jetting in the molten iron, jetting pressure: 180KPa, winding-up flow: 9m
3/ h, spray magnesium amount: 0.5～0.6Kg/t iron, winding-up back molten steel sulfur content :≤0.005%;
B. bessemerize: the process of bessemerizing adopts top blast oxygen, argon bottom-blowing, and top blast oxygen work oxygen is pressed 0.85～1.0MPa, oxygen flow 11000-15000m
3/ h, oxygen supply intensity 3.7-4.0Nm
3/ (t*min), pure oxygen supply time 11～13 minutes; Argon bottom-blowing pressure: 0.3～1.3MPa, bottom blowing flow: 50～120m
3/ h;
C. Argon is fed silk: utilize wire feeder to feed aluminum steel, the aluminum steel add-on at the Argon station: 1.5～1.7Kg/t steel, and argon blowing time after the line feeding 〉=8 minute:
D. sheet billet continuous casting: adopt the protection casting.
The cold rolling method for making steel of above-mentioned SPHD level with deep drawing steel, the preferred chemical ingredients proportioning of its steel grade is as follows: C:0.02%～0.05%, Si≤0.02%, Mn:0.015～0.30%, P≤0.015%, S≤0.012%, Als:0.015～0.040%, surplus Fe.
The cold rolling method for making steel of above-mentioned SPHD level with deep drawing steel, the mechanical energy technical indicator of this deep drawing steel is as follows:
Yield strength: Rp0.5 240～320MPa
Tensile strength: Rm:270～415MPa
Unit elongation: A 〉=35%
Clod wash: 180 ° of d=a a: sample thickness, d: flexual center diameter.
The cold rolling method for making steel of above-mentioned SPHD level with deep drawing steel, it comprises following operation:
A. hot metal pretreatment: the passivated magnesium of jetting in the molten iron, jetting pressure: 180KPa, winding-up flow: 9m
3/ h, spray magnesium amount: 0.5Kg/t iron, winding-up back molten steel sulfur content :≤0.005%;
B. bessemerize: the process of bessemerizing adopts top blast oxygen, argon bottom-blowing, and top blast oxygen work oxygen is pressed 0.85～1.0MPa, oxygen flow 11000-15000m
3/ h, oxygen supply intensity 3.7-4.0Nm
3/ (t*min), pure oxygen supply time 11～13 minutes; Argon bottom-blowing pressure: 0.3～1.3MPa, bottom blowing flow: 50～120m
3/ h;
C. Argon is fed silk: utilize wire feeder to feed aluminum steel, the aluminum steel add-on at the Argon station: 1.5～1.7Kg/t steel, and argon blowing time after the line feeding 〉=8 minute:
D. sheet billet continuous casting: adopt the protection casting.
Provided by the inventionly be used to make that the SPHD level is cold rolling fills a prescription with deep drawing steel, on the basis of strictness control carbon, silicon, sulphur, phosphorus content, rationally control the content of Als, the Als that makes in the steel to be deposited had both played the effect of refinement band crystalline grain of steel, can not make the cleanliness factor that the band hardness of steel increases, plasticity reduces and influence molten steel because Als content is high again.The detection index shows, filling a prescription according to the present invention, the SPHD level of producing is cold rolling can to satisfy the related products requirement fully with its mechanical performance index of deep drawing steel, wide strip or roll bending during the billet rolling that adopts mentioned component to produce becomes all are better than currently available products through the visual appearance and the inside metallographic of cold rolling latter made automobile, motorcycle accessories, static floor, household electrical appliance.In addition; the cold rolling deep drawing steel method for making steel of using of SPHD level provided by the present invention; process control through operations such as hot metal pretreatment, top and bottom combined blown converter blowing, the argon station deoxidation of tapping back, ar blowing refining, protection casting; can reach and improve molten steel cleanliness factor and slab quality; guarantee to be with steel mechanical property, and make the production process purpose of control easily.
Embodiment
The cold rolling deep drawing steel prescription of using of SPHD level provided by the invention be to guarantee the required high-elongation performance characteristics of deep-draw part, adopts low-carbon (LC), low silicon, low-sulfur, low-phosphorous and an amount of Als, and principal element acts in steel and control method is analyzed as follows in the prescription:
Low-carbon (LC), silicon are the bases of improving the steel unit elongation, and carbon, silicon are as the interstitial atom of solid solution in steel, along with its content increases, the yield strength of steel also raises, and improves yield ratio thereupon, has strengthened resistance to deformation, influence forming property, so for deep drawing steel, carbon, silicone content are low more good more.Adopt common top-blown oxygen converter decarburization, oxygen supply time is long, and the short production cost of life of converter increases, and molten steel is seriously polluted, molten steel oxygen level height, steel quality is poor, adopts refining means such as LF, VOD to produce a large amount of secondary oxidation things, and complex shape proportion is unfavorable for more greatly getting rid of, molten steel is caused secondary pollution, cause difficulty to production, reduced the mechanical property of product, produce carburetting simultaneously, increase the silicon phenomenon.Method for making steel of the present invention adopts the means of converter top and bottom complex blowing, ar blowing refining to take off C, fall Si in steelmaking process for reaching ultralow carbon containing target in the prescription, and removes objectionable constituent and impurity in the molten steel, guarantees the molten steel cleaning.
Low sulfur-bearing, phosphorus amount are the keys that the present invention fills a prescription, and sulphur, phosphorus are harmful element in steel, sulphur can increase steel crack sensitivity, influence some characteristic of steel, it endangers through the whole process that shapes to the final user from molten steel solidification to steel rolling.Phosphorus in molten steel with Fe
3The form of P exists, and it has changed the behavior of separating out of C, and influences the state and the effect of solid solution C atom.Phosphorus in the steel is controlled at below 0.015%; Sulphur is controlled at below 0.015% and even 0.012% followingly can effectively reduces the sulfide nonmetal inclusion, has improved the performances such as ductility, toughness of steel, makes the strand of production be difficult for cracking, and production process is controlled easily.The present invention is at hot metal pre process procedures, the employing passivated magnesium method sulphur removal of in molten iron, jetting, control spray magnesium amount and jetting pressure, winding-up flow prolong duration of contact of magnesium and molten iron, reduce because nebulizer gas pressure, flow are excessive, cause overflow the in a large number problem of sweetening effectiveness of magnesium.Winding-up back molten steel sulfur content :≤0.005%.
Control Als content in steel is the important step that the present invention fills a prescription, for producing SPHD level deep drawing steel, the control of ALs is also very crucial in the molten steel, exist Als that the effect of refinement band crystalline grain of steel is arranged in the steel, but Als is if too high levels band hardness of steel can increase, the ALs loss is too much in process of production simultaneously, the AL of generation
2O
3Being mingled with and will increasing, is suitable between being controlled at 0.015%～0.040% in order to ensure the cleanliness factor of molten steel and the good deep drawability ALs of band steel.
The inventive method is not used refining means such as LF stove, VD stove, RH stove behind the converter tapping, only Argon is adjusted to molten steel composition: C:0.02%～0.05%, Si≤0.02%, Mn:0.015～0.30%, P≤0.015%, S≤0.012%, Als:0.015～0.040%; In tapping process, do not add ferro-aluminum and the relevant aluminium class reductor that contains, and adopt the Argon station to utilize wire feeder to feed aluminum steel, with the precisely control product composition, the advantage of aforesaid method is that products C, the control of Si content are lower, Als is easy to control, and oxide inclusion is few, the molten steel cleaning.
Several embodiment below are provided:
Its chemical composition content, mechanical property such as following table:
(the chemical ingredients surplus is Fe in the foregoing description)
The method for making steel master operation is as follows:
Hot metal pretreatment: the passivated magnesium of jetting in molten iron makes magnesium and reaction of Salmon-Saxl form solid-state MgS, to reach the purpose of removing sulphur, jetting pressure: 180KPa, winding-up flow: 9m
3/ h, spray magnesium amount: 0.5Kg/t～0.6Kg/t iron, winding-up back molten steel sulfur content :≤0.005%.Prolong the duration of contact (12 minutes) of magnesium and molten iron, to reach dark desulfurization.
Bessemerize: the process of bessemerizing adopts top blast oxygen, argon bottom-blowing, and top blast oxygen work oxygen is pressed 0.85～1.0MPa, oxygen flow 11000-15000m
3/ h, oxygen supply intensity 3.7-4.0Nm
3/ (t*min), pure oxygen supply time 11～13 minutes; Argon bottom-blowing pressure: 0.3～1.3MPa, bottom blowing flow: 50～120m
3/ h.Top blast oxygen adopts constant voltage to become the rifle operation, rationally control top blowing oxygen atmospheric pressure and oxygen lance position are to regulate effectively and the mixing effect of controlling the molten bath, blowing is steady to reach, tap to tap time is short, take off C, fall Si, and removes objectionable constituent and impurity in the molten steel, guarantees the molten steel cleaning.
Tapping process: the not deoxidation of tapping only adds 2.2～2.5Kg/t mid-carbon fe-mn.
Argon is fed silk: utilize wire feeder to feed aluminum steel, the aluminum steel add-on at the Argon station: 1.5～1.7Kg/t steel, argon blowing time after the line feeding 〉=8 minute.Use feeding wire machine according to target call adding rate line, can make the AL specific absorption stable, produce oxide compound and be mingled with less.Only adopt the refining means of Argon to avoid the secondary oxidation thing to generate.Argon blowing rate will be guaranteed the steady reaction of liquid steel level, and the exposed liquid level diameter 300mm～500mm of molten steel guarantees molten steel composition of inclusions come-up.
Sheet billet continuous casting: adopt ladle, the casting of tundish duplicate protection, guarantee steel quality to reduce the ALs loss.
Claims (3)
1. the cold rolling method for making steel of a SPHD level with deep drawing steel, the chemical ingredients proportioning of described deep drawing steel is: C≤0.10%, Si≤0.03%, Mn≤0.40%, P :≤0.015%, S :≤0.015%, Als:0.015～0.065%, surplus are Fe, it is characterized in that, it comprises following operation:
A. hot metal pretreatment: the passivated magnesium of jetting in the molten iron, jetting pressure: 180KPa, winding-up flow: 9m
3/ h, spray magnesium amount: 0.5～0.6Kg/t iron, winding-up back molten steel sulfur content :≤0.005%;
B. bessemerize: the process of bessemerizing adopts top blast oxygen, argon bottom-blowing, and top blast oxygen work oxygen is pressed 0.85～1.0MPa, oxygen flow 11000～15000m
3/ h, oxygen supply intensity 3.7～4.0Nm
3/ (t*min), pure oxygen supply time 11～13 minutes; Argon bottom-blowing pressure: 0.3～1.3MPa, bottom blowing flow: 50～120m
3/ h;
C. Argon is fed silk: utilize wire feeder to feed aluminum steel, the aluminum steel add-on at the Argon station: 1.5～1.7Kg/t steel, and argon blowing time after the line feeding 〉=8 minute:
D. sheet billet continuous casting: adopt the protection casting.
2. the cold rolling method for making steel of SPHD level according to claim 1 with deep drawing steel, it is characterized in that, the chemical ingredients proportioning of described deep drawing steel is: C:0.02%～0.05%, Si≤0.02%, Mn:0.015～0.30%, P≤0.015%, S≤0.012%, Als:0.015～0.040%, surplus are Fe.
3. the cold rolling method for making steel of SPHD level according to claim 1 and 2 with deep drawing steel, it is characterized in that: the mechanical property technical indicator of described deep drawing steel is as follows:
Yield strength Rp0.5:240～320MPa
Tensile strength: Rm:270～415MPa
Unit elongation: A 〉=35%
Clod wash: 180 ° of d=a a: sample thickness, d: flexual center diameter.
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| CN101591752B (en) * | 2009-06-09 | 2011-04-06 | 武汉钢铁(集团)公司 | Steel for cup-shaped iron core of loudspeaker and production method thereof |
| CN101831585A (en) * | 2010-05-19 | 2010-09-15 | 首钢总公司 | High-strength steel for automotive wheels and manufacture method thereof |
| CN102534362A (en) * | 2012-03-06 | 2012-07-04 | 吉林建龙钢铁有限责任公司 | Preparation technology for fine-grained steel 510L |
| CN103361464B (en) * | 2012-03-29 | 2014-12-24 | 山西太钢不锈钢股份有限公司 | Method for blowing oxygen at converter bottom |
| CN105256225B (en) * | 2015-11-11 | 2017-03-29 | 攀钢集团攀枝花钢铁研究院有限公司 | Elevator cold-rolled steel sheet and preparation method thereof |
| CN114908209B (en) * | 2022-04-02 | 2023-11-24 | 山西太钢不锈钢股份有限公司 | Method for improving surface quality of cold-rolled deep-drawing steel |
| CN115612784A (en) * | 2022-11-07 | 2023-01-17 | 宁波钢铁有限公司 | SPHD steel and method for reducing addition amount of RH process aluminum-based deoxidizer |
| CN116334479A (en) * | 2023-02-11 | 2023-06-27 | 武安市裕华钢铁有限公司 | Low-cost deep-drawing steel plate and production process thereof |
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| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Chengde Jianlong Special Steel Co., Ltd. Assignor: Jianlong Industrial Co., Ltd., Tangshan City Contract fulfillment period: 2009.7.1 to 2014.6.30 contract change Contract record no.: 2009990001129 Denomination of invention: Smelting process of SPHD level cold rolled deep-drawing steel Granted publication date: 20090408 License type: Exclusive license Record date: 20091010 |
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Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2009.7.1 TO 2014.6.30; CHANGE OF CONTRACT Name of requester: CHENGDE JIANLONG SPECIAL STEEL CO., LTD. Effective date: 20091010 |
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Assignee: Jilin Jianlong Iron Steel Co.,Ltd. Assignor: Jianlong Industrial Co., Ltd., Tangshan City Contract record no.: 2011990001047 Denomination of invention: Smelting process of SPHD level cold rolled deep-drawing steel Granted publication date: 20090408 License type: Exclusive License Open date: 20071003 Record date: 20111118 |
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