CN1487099A - Technological process of making flat spring steel for automobile - Google Patents
Technological process of making flat spring steel for automobile Download PDFInfo
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- CN1487099A CN1487099A CNA031389376A CN03138937A CN1487099A CN 1487099 A CN1487099 A CN 1487099A CN A031389376 A CNA031389376 A CN A031389376A CN 03138937 A CN03138937 A CN 03138937A CN 1487099 A CN1487099 A CN 1487099A
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Abstract
The flat spring steel for automobile is produced via converter smelting process. Compared with available technology, the present invention has the following advantages and positive effects: utilizing molten iron with less harmful elements as material to result in high flat spring steel quality; higher finished product rate and lower power consumption to result in lower cost than production in electric furnace; casting molten steel into small square billet to omit the billet cutting step and lower cost; and high size precision of the continuously cast small square billet to ensure high size precision of flat spring steel.
Description
Technical field
The present invention relates to a kind of automobile made from the processing method of spring flat steel, specifically to the improvement of existing method.
Background technology
Spring flat steel is mainly used in the shock spring of motor vehicle such as automobile, because shock spring is under moving load, is subjected to use under the conditions such as double vibrations, impact, thereby requires it to have higher intensity, safe range of stress and impelling strength to it.Its main trade mark is 60Si
2Mn, 50CrV etc.Existing automobile is with the process using eaf process of spring flat steel, and its technical process is roughly as follows, electric furnace → notes steel ingot → cogging → roll into band steel.Find that there is following defective in this technology through long-term practice: it is steel scrap that electric furnace adopts raw material, and a large amount of harmful elements is arranged in the steel scrap, and the quality of band steel is exerted an adverse impact.2, the steel ingot cogging billet yield does not reach 90%, adds that the heating steel ingot consumes expenses such as the water of heavy oil, the operation of rolling, electricity, roll, guide and guard consumption, wage for workmen, equipment amortization, increases cost more than 200 yuan/ton.3, cogging scale rate variance with the band steel scale rate variance that the random length base is produced, can not be met consumers' demand.For this reason, the continuous feedback opinion of many automakers and user wishes that a kind of novel method that can make the high-quality band steel produces as early as possible.
Summary of the invention
The present invention will solve of poor quality, steel ingot cogging billet yield that existing spring flat steel exists not reach 90% and problem such as cogging scale rate variance.
In order to reach the purpose that solves the problems of the technologies described above, technical scheme of the present invention is that a kind of automobile processing method of spring flat steel is characterized in that: spring flat steel adopts converter smelting process to make.
In addition, also comprise following technological method among the present invention: described spring flat steel adopts converter smelting process to be undertaken by following operation:
Stocking process → blowing operation → deoxygenated alloying → continuous casting billet → roll into band steel;
(1), the main raw material of described stocking process is molten iron 85-90%, steel scrap 10-15%;
(2), described blowing operation adopts the catch carbon method;
(3), in the deoxidation alloying operation, adopt low ferrosilicoaluminum, aluminium content should be controlled at≤0.2%.
In addition, also comprise following technological method among the present invention, continuous casting billet operation comprises following method:
Arc billet caster with a R5m will become the square billet of 120mm * 120mm or 150mm * 150mm through the purified molten steel casting;
Mold liquid level is controlled automatically: adopt Cs137 type liquid surface detector to detect liquid steel level, and the control pulling rate, make liquid level stabilizing, reduce the surface imperfection that the invar liquid fluctuating causes,
(1) protection cast: from big two links of wrapping tundish, tundish, adopt long nozzle and submerged nozzle that steel ice is carried out airtight cast, prevent the casting process secondary oxidation to crystallizer.
(2) crystallizer induction stirring: solenoid is housed in crystallizer, produces the electromagnetic force of rotation, the molten steel that injects crystallizer is under the effect of electromagnetic force, and generation rotatablely moves;
(3) select the mold oscillation parameter for use
Amplitude: ± 3mm, shake frequently: 200-240 time/minute;
(4) adopt water atomizing nozzle to carry out the secondary cooling
Adopt nozzle for atomizing water with air, make the water coolant high-efficient atomizing, and be sprayed on casting billet surface uniformly, strand is evenly cooled off.
In addition, also comprise following technological method among the present invention: in the deoxygenated alloying, adopt the refining of LF stove, and pass through
1. low Argon: argon gas is blown into molten steel from ladle bottom, stirs molten steel, reaches the purpose of even composition, uniform temperature, promotes inclusion floating simultaneously;
2. in the refining bag, make the reductibility white slag, with further deoxidation, desulfurization and absorption deoxidation products.
In addition, also comprise following technological method among the present invention: described catch carbon method is according to the initial carbon content of shove charge molten iron and institute's steelmaking kind target carbon content, calculates the requisite oxygen amount, then according to requisite oxygen amount control oxygen supply time.By reasonable control process rifle position, decarbonization rate and slag oxidation, remove impurity such as P, S fast simultaneously, after carbon content and liquid steel temperature met the steel grade requirement in steel, P, S had also reached requirement, stopped blowing.
The present invention compared with prior art has the following advantages and positively effect: 1, refine band steel with converter, mainly adopting molten iron is raw material, and harmful element is less in the molten iron, and the band steel quality of producing is good.2, owing to the yield rate height, current consumption is few, and per ton cost descends about 200 yuan than electric furnace.3, molten steel is directly cast little square billet, has omitted the cogging operation, has reduced cost.4, continuous cast billet scale rate height can guarantee band steel scale rate, satisfies user's demand.5, adopt the catch carbon method in the blowing operation, its advantage is: the finishing slag iron oxide content is low, the recovery rate of iron height; Terminal point oxygen, nitrogen, hydrogen richness are low, and do not add carburelant, and nonmetal inclusion is few in the molten steel; Save oxygen, carburelant and alloy, reduced steel-making cost.6, during alloying, key is to adopt suitable alloy, and the present invention adopts low ferro-silicon-aluminium (aluminium content is less than 0.2%), when having solved continuous casting because the higher rust mouth of a river problem that causes of the sour molten aluminium of molten steel.7, for there is the temperature uneven components in the molten steel that overcomes through deoxidation alloying, the deoxidation products of generation is stayed in the molten steel, easily forms problems such as steel inclusion, and therefore, the reply molten steel adopts refinery practice, thereby addresses the aforementioned drawbacks effectively.8, control automatically by mold liquid level, and the control pulling rate, make liquid level stabilizing, reduce the surface imperfection that the invar liquid fluctuating causes; Adopt the protection cast,, adopt long nozzle and submerged nozzle that molten steel is carried out airtight cast, prevent the casting process secondary oxidation from big two links of wrapping tundish, tundish to crystallizer; By the crystallizer induction stirring, produce following function and effect, because the different and centrifugation of molten steel and impurity density makes impurity to center enrichment and come-up, molten steel solidification tissue holder foreign material are reduced.Cc billet surface quality improves; Because the stirring action of molten steel has reduced the liquid steel temperature tonsure, has reduced superheating temperature, and casting blank solidification tissue defects (as shrinkage cavity, crackle etc.) is greatly reduced; Select rational mold oscillation parameter for use, mold oscillation helps the disengaging (demoulding) of solidified shell and crystallizer wall, and reduce resistance of billet withdrawal, thereby avoided causing darker oscillation mark effectively, and the phenomenon that cracks at the oscillation mark place; If the secondary inhomogeneous cooling is even, can causes casting billet surface depression (local overcooling contraction), and produce internal fissure.By adopting nozzle for atomizing water with air, it is efficiently vaporific that water coolant is formed, and be sprayed on casting billet surface uniformly, makes the full and uniform cooling of strand, thereby solved continuously cast bloom surface depression problem effectively.
Description of drawings
Below in conjunction with drawings and Examples the present invention is described in detail.
Fig. 1 is the synoptic diagram that the present invention adopts 30 tons of top-blown oxygen converters;
Among Fig. 11, the oxygen rifle; 2,30tLD converter; 3, ladle; 4, slag basin;
Fig. 2 is the structural representation of LF ladle refining furnace of the present invention;
5, electrode; 6, alloy hopper; 7, low Argon gas permeable brick; 8, slide gate nozzle;
Fig. 3 is a R5m billet caster structural representation of the present invention.
9, ladle; 10, tundish; 11, crystallizer; 12, level detection; 13, electromagnetic stirrer coil; 14, aerial fog nozzle; 15, continuously cast bloom; 16, straightening machine; 17, pulling rate detects; 18, shear.
Embodiment
Referring to Fig. 1, Fig. 2 and Fig. 3, the trade mark of the spring flat steel of being smelted is 60Si
2Mn adopts converter smelting process to make.
Described spring flat steel adopts converter smelting process to be undertaken by following operation:
Stocking process → blowing operation → deoxygenated alloying → continuous casting billet → roll into band steel;
(1), the main raw material of described stocking process is molten iron 85-90%, steel scrap 10-15%;
(2), described blowing operation adopts the catch carbon method, the catch carbon method is according to the initial carbon content of shove charge molten iron and institute's steelmaking kind target carbon content, calculates the requisite oxygen amount, then according to requisite oxygen amount control oxygen supply time.By reasonable control process rifle position, decarbonization rate and slag oxidation, remove impurity such as P, S fast simultaneously, after carbon content and liquid steel temperature met the steel grade requirement in steel, P, S had also reached requirement, stopped blowing.
(3), in the deoxidation alloying operation, adopt low ferrosilicoaluminum, aluminium content should be controlled at≤0.2%.
Adopt the refining of LF stove, and pass through:
Low Argon: argon gas is blown into molten steel from ladle bottom, stirs molten steel, reaches the purpose of even composition, uniform temperature, promotes inclusion floating simultaneously;
In the refining bag, make the reductibility white slag, with further deoxidation, desulfurization and absorption deoxidation products.
(4), continuous casting billet operation comprises following method:
Arc billet caster with a R5m will become the square billet of 120mm * 120mm or 150mm * 150mm through the purified molten steel casting;
Mold liquid level is controlled automatically: adopt Cs137 type liquid surface detector to detect liquid steel level, and the control pulling rate, make liquid level stabilizing, reduce the surface imperfection that the invar liquid fluctuating causes,
1., protection cast: from big two links of wrapping tundish, tundish, adopt long nozzle and submerged nozzle that molten steel is carried out airtight cast, prevent the casting process secondary oxidation to crystallizer.
2., crystallizer induction stirring: solenoid is housed in crystallizer, produces the electromagnetic force of rotation, the molten steel that injects crystallizer is under the effect of electromagnetic force, and generation rotatablely moves;
3., select the mold oscillation parameter for use, amplitude: ± 3mm, shake frequently: 200-240 time/minute;
4., adopt water atomizing nozzle to carry out the secondary cooling.
Adopt nozzle for atomizing water with air, make the water coolant high-efficient atomizing, and be sprayed on casting billet surface uniformly, strand is evenly cooled off.
Above-mentioned explanation is not to be limitation of the present invention, and the present invention also is not limited to above-mentioned giving an example, those skilled in the art, and in essential scope of the present invention, the variation of making, remodeling, interpolation or replacement also should belong to protection scope of the present invention.
Claims (5)
1, a kind of automobile processing method of spring flat steel is characterized in that: spring flat steel adopts converter smelting process to make.
2, a kind of automobile according to claim 1 processing method of spring flat steel is characterized in that described spring flat steel adopts converter smelting process to be undertaken by following operation:
Stocking process → blowing operation → deoxygenated alloying → continuous casting billet → roll into band steel;
(1), the main raw material of described stocking process is molten iron 85-90%, steel scrap 10-15%;
(2), described blowing operation adopts the catch carbon method;
(3), in the deoxidation alloying operation, adopt low ferrosilicoaluminum, aluminium content should be controlled at≤0.2%.
3, a kind of automobile according to claim 2 processing method of spring flat steel is characterized in that continuous casting billet operation comprises following method:
Arc billet caster with a R5m will become the square billet of 120mm * 120mm or 150mm * 150mm through the purified molten steel casting;
Mold liquid level is controlled automatically: adopt Cs137 type liquid surface detector to detect liquid steel level, and the control pulling rate, make liquid level stabilizing, reduce the surface imperfection that the invar liquid fluctuating causes,
(1) protection cast: from big two links of wrapping tundish, tundish, adopt long nozzle and submerged nozzle that molten steel is carried out airtight cast, prevent the casting process secondary oxidation to crystallizer.
(2) crystallizer induction stirring: solenoid is housed in crystallizer, produces the electromagnetic force of rotation, the molten steel that injects crystallizer is under the effect of electromagnetic force, and generation rotatablely moves;
(3) select the mold oscillation parameter for use
Amplitude: ± 3mm, shake frequently: 200-240 time/minute;
(4) adopt water atomizing nozzle to carry out the secondary cooling
Adopt nozzle for atomizing water with air, make the water coolant high-efficient atomizing, and be sprayed on casting billet surface uniformly, strand is evenly cooled off.
4, a kind of automobile according to claim 3 is characterized in that adopting the refining of LF stove in the deoxygenated alloying, and passes through with the processing method of spring flat steel
1. low Argon: argon gas is blown into molten steel from ladle bottom, stirs molten steel, reaches the purpose of even composition, uniform temperature, promotes inclusion floating simultaneously;
2. in the refining bag, make the reductibility white slag, with further deoxidation, desulfurization and absorption deoxidation products.
5, a kind of automobile according to claim 4 processing method of spring flat steel, it is characterized in that: described catch carbon method is according to the initial carbon content of shove charge molten iron and institute's steelmaking kind target carbon content, calculate the requisite oxygen amount, then according to requisite oxygen amount control oxygen supply time.By reasonable control process rifle position, decarbonization rate and slag oxidation, remove impurity such as P, S fast simultaneously, after carbon content and liquid steel temperature met the steel grade requirement in steel, P, S had also reached requirement, stopped blowing.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031389376A CN1487099A (en) | 2003-07-30 | 2003-07-30 | Technological process of making flat spring steel for automobile |
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| CNA031389376A CN1487099A (en) | 2003-07-30 | 2003-07-30 | Technological process of making flat spring steel for automobile |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102413954A (en) * | 2009-04-23 | 2012-04-11 | Sms西马格股份公司 | Process and apparatus for continuous casting of slab |
| CN104084550A (en) * | 2014-07-28 | 2014-10-08 | 重庆钢铁(集团)有限责任公司 | Continuous casting plate blank production control method for rolled thick plate |
| CN106399826A (en) * | 2016-08-30 | 2017-02-15 | 湖北立晋钢铁集团有限公司 | Spring flat steel for automobile and manufacturing method of spring flat steel |
| CN106978571A (en) * | 2017-04-01 | 2017-07-25 | 东风汽车悬架弹簧有限公司 | The third generation spring for automobile band steel and preparation method of a kind of microalloying |
| CN110548843A (en) * | 2019-09-20 | 2019-12-10 | 江苏科技大学 | Electromagnetic stirring device for continuous casting machine |
| CN111349846A (en) * | 2018-12-20 | 2020-06-30 | 新疆八一钢铁股份有限公司 | Production method of high-strength and high-toughness spring flat steel |
-
2003
- 2003-07-30 CN CNA031389376A patent/CN1487099A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102413954A (en) * | 2009-04-23 | 2012-04-11 | Sms西马格股份公司 | Process and apparatus for continuous casting of slab |
| CN104084550A (en) * | 2014-07-28 | 2014-10-08 | 重庆钢铁(集团)有限责任公司 | Continuous casting plate blank production control method for rolled thick plate |
| CN106399826A (en) * | 2016-08-30 | 2017-02-15 | 湖北立晋钢铁集团有限公司 | Spring flat steel for automobile and manufacturing method of spring flat steel |
| CN106978571A (en) * | 2017-04-01 | 2017-07-25 | 东风汽车悬架弹簧有限公司 | The third generation spring for automobile band steel and preparation method of a kind of microalloying |
| CN106978571B (en) * | 2017-04-01 | 2021-04-27 | 东风汽车底盘系统有限公司 | Microalloyed spring flat steel for third-generation automobile and preparation method |
| CN111349846A (en) * | 2018-12-20 | 2020-06-30 | 新疆八一钢铁股份有限公司 | Production method of high-strength and high-toughness spring flat steel |
| CN110548843A (en) * | 2019-09-20 | 2019-12-10 | 江苏科技大学 | Electromagnetic stirring device for continuous casting machine |
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