CN101928892A - Spring steel round steel and production process thereof - Google Patents
Spring steel round steel and production process thereof Download PDFInfo
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- CN101928892A CN101928892A CN 201010264230 CN201010264230A CN101928892A CN 101928892 A CN101928892 A CN 101928892A CN 201010264230 CN201010264230 CN 201010264230 CN 201010264230 A CN201010264230 A CN 201010264230A CN 101928892 A CN101928892 A CN 101928892A
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Abstract
The invention belongs to the field of metallurgy and discloses spring steel round steel and a production process thereof. The spring steel round steel comprises the following components in percentage by weight: 0.56 to 0.64 percent of carbon (C), 1.60 to 2.00 percent of silicon (Si), 0.70 to 1.00 percent of manganese (Mn), less than or equal to 0.025 percent of phosphorus (P), less than or equal to 0.025 percent of sulfur (S), 0.15 to 0.35 percent of chromium (Cr), less than or equal to 0.35 percent of nickel (Ni), less than or equal to 0.25 percent of copper (Cu) and the balance of Ferrum (Fe). The production process comprises the following steps of: converter or electric furnace smelting, LF refining, VD degassing, CCM continuous casting and bar rolling. The spring steel round steel of the invention has the characteristics of low alloying element content, low decarburizing tendency, high temper resistance, high hot-working performance, low cost, high performance after heat processing and the like of a common round steel; besides, the spring steel round steel simultaneously has high cold workability under the condition of air cooling after rolling. The process ensures that the rolled spring steel round steel obtains a texture of pearlite and a small number of ferrolites under the condition of air cooling, and has high plasticity and toughness during cold working, and every performance can meet the requirements of GB/T1222 after heat processing.
Description
Technical field
The invention belongs to field of metallurgy, relate to a kind of steel and production technique thereof, a kind of specifically spring steel round steel and production technique thereof.
Background technology
Spring steel 60Si2MnA alloying element content is low, and decarburizing tendency is little, and temper resistance is good, and hot workability is good, cost is low, and excellent property after the thermal treatment is widely used in the industries such as automobile, railway and engineering machinery.But when producing round steel, regular meeting's pro-eutectoid goes out ferrite network under the air cooling condition, causes plasticity and toughness seriously to descend, and the cold working process is easily broken, easily causes personal injury, and hot-work has increased a large amount of thermal treatment costs again.
Summary of the invention
Technical problem to be solved by this invention is: at the shortcoming of above prior art existence, a kind of spring steel round steel and production technique thereof are proposed, spring steel round steel is rolled under the air cooling condition of back have good cold-forming property, have during cold working good mould, toughness.
The technical scheme that the present invention solves above technical problem is:
A kind of spring steel round steel comprises following composition: C:0.56%～0.64% by weight percentage, Si:1.60～2.00%, Mn:0.70%～1.00%, P :≤0.025%, S :≤0.025%, Cr:0.15%～0.35%, Ni :≤0.35%, Cu :≤0.25%, surplus is Fe.
Because spring steel round steel of the present invention adds 0.15%～0.35% Cr element, guarantee that rolling spring steel round steel obtains perlite and adds a little ferrite tissue under the air cooling condition, have during cold working good mould, toughness, every performance all can reach the requirement of GB/T1222 after the thermal treatment simultaneously.
The production technique of spring steel round steel of the present invention comprises following operation: converter or electrosmelting, LF refining, the VD degassing, CCM continuous casting and rolling bar.
Converter or electrosmelting operation: make tapping back carbon content 〉=0.05%, phosphorus content≤0.015%, sulphur content≤0.025%; Adopt red packet, converter pushing off the slag tapping, electric furnace slag free tapping; Tapping adds silicon manganese dioxidation; Tapping temperature 〉=1630 ℃.
The LF refining procedure: refining time 30～60 minutes, refining process add carbon dust, silicomanganese, ferromanganese and ferrochrome and adjust chemical ingredients, 60～100 meters on refining later stage feeding CaSi line, and tapping temperature is controlled at 1580～1600 ℃.
The VD degassing process: vacuum tightness is below 1 millibar, vacuum-treat 15～30 minutes, and after vacuum-treat finished, 10～30 minutes soft blow time, to impel field trash Shang Hu, tapping temperature was controlled at 1510～1540 ℃.
The CCM continuous casting working procedure: the continuous casting section is set to 150mm * 150mm; Use the aluminium matter mouth of a river, implement total process protective casting; The target superheating temperature is less than 35 ℃, and is weak cold; Pulling rate is at 1.5～3.0m/min.
Rolling bar operation: continuously cast bloom by an inspection, is carried out reconditioning to defective continuously cast bloom and handles; 1050～1150 ℃ of start rolling temperatures; Roll the back air cooling, avoid blowing to cause that round steel hardness is inhomogeneous, the steel temperature is chilled to 530～580 ℃, and bundling is collected after the no obvious red heat in steel surface, and cooling in heap is to room temperature.
In converter or the electrosmelting operation, tapping adds silicon manganese dioxidation, add-on 600～800Kg.In the LF refining procedure, add carbon dust, silicomanganese, ferromanganese and ferrochrome and press limit adjustment chemical ingredients in the composition scope.
Adopt production technique of the present invention, can produce the above-mentioned spring steel round steel that has good cold-forming property under the air cooling condition of back that rolls.
Advantage of the present invention is: spring steel round steel of the present invention is low except that having general 60Si2MnA alloying element content, and decarburizing tendency is little, and temper resistance is good, hot workability is good, cost is low, characteristics such as excellent property after the thermal treatment simultaneously, are rolled under the air cooling condition of back and are had good cold-forming property.Guarantee that rolling spring steel round steel obtains perlite and adds a little ferrite tissue under the air cooling condition, have during cold working good mould, toughness, every performance all can reach the requirement of GB/T1222 after the thermal treatment simultaneously.
Adopt the spring steel round steel of Φ 12～Φ 30 specifications of production technique production of the present invention, hot rolling attitude tensile property such as table 1:
Table 1
| Sequence number | Yield strength, MPa | Tensile strength, MPa | Unit elongation, % | Hundred shrinkages, % |
| One | ?800 | ?1010 | 13.0 | 32.0 |
| Two | ?570 | ?1060 | 13.5 | 29.5 |
| Three | ?560 | ?1050 | 13.0 | 32.5 |
| Four | ?580 | ?1060 | 12.0 | 33.0 |
Thermal treatment back draft performance such as table 2:
Table 2
| Sequence number | Yield strength, MPa | Tensile strength, MPa | Unit elongation, % | Hundred shrinkages, % |
| One | ?1470 | ?1660 | 6.0 | 33.0 |
| Two | ?1460 | ?1670 | 8.5 | 34.5 |
| Three | ?1520 | ?1690 | 7.5 | 32.5 |
| Four | ?1450 | ?1620 | 6.0 | 35.5 |
Embodiment
The present invention is a kind of spring steel round steel and production technique thereof, and the composition of the spring steel round steel of embodiment one to embodiment five is as shown in the table:
Table 3 (%)
| Sequence number | C | Si | Mn | P | S | Cr | Ni | Cu | Fe |
| Embodiment one | 0.59 | 1.76 | 0.79 | 0.010 | 0.001 | 0.21 | 0.06 | 0.18 | Surplus |
| Embodiment two | 0.60 | 1.77 | 0.78 | 0.013 | 0.006 | 0.21 | 0.06 | 0.14 | Surplus |
| Embodiment three | 0.58 | 1.72 | 0.78 | 0.011 | 0.001 | 0.21 | 0.07 | 0.16 | Surplus |
| Embodiment four | 0.60 | 1.83 | 0.77 | 0.010 | 0.002 | 0.22 | 0.07 | 0.16 | Surplus |
| Embodiment five | 0.59 | 1.74 | 0.77 | 0.009 | 0.003 | 0.22 | 0.07 | 0.19 | Surplus |
| Embodiment six | 0.58 | 1.70 | 0.76 | 0.005 | 0.001 | 0.20 | 0.07 | 0.19 | Surplus |
The production technique of each embodiment is specific as follows:
Embodiment one
The production technique of embodiment one spring steel round steel comprises following operation: converter or electrosmelting, LF refining, the VD degassing, CCM continuous casting and rolling bar.
Converter or electrosmelting operation: make tapping back carbon content 〉=0.05%, phosphorus content≤0.015%, sulphur content≤0.025%; Adopt red packet, converter pushing off the slag tapping, electric furnace slag free tapping; Tapping adds silicon manganese dioxidation, add-on 600Kg; 1630 ℃ of tapping temperatures.
The LF refining procedure: refining time 30 minutes, refining process add carbon dust, silicomanganese, ferromanganese and ferrochrome and adjust chemical ingredients, 60 meters on refining later stage feeding CaSi line, and tapping temperature is controlled at 1580 ℃.
The VD degassing process: vacuum tightness is below 1 millibar, vacuum-treat 15 minutes, and after vacuum-treat finished, 10 minutes soft blow time, to impel field trash Shang Hu, tapping temperature was controlled at 1510 ℃.
The CCM continuous casting working procedure: the continuous casting section is set to 150mm * 150mm, uses the aluminium matter mouth of a river, implements total process protective casting, and the target superheating temperature is less than 35 ℃, and weak cold, pulling rate is at 1.5m/min.
Rolling bar operation: continuously cast bloom by an inspection, is carried out reconditioning to defective continuously cast bloom and handles; 1050 ℃ of start rolling temperatures; Roll the back air cooling, avoid blowing to cause that round steel hardness is inhomogeneous.The steel temperature is chilled to 530 ℃, and bundling is collected after the no obvious red heat in steel surface, and cooling in heap is to room temperature.
Embodiment two
The production technique of embodiment two spring steel round steel comprises following operation: converter or electrosmelting, LF refining, the VD degassing, CCM continuous casting and rolling bar.
Converter or electrosmelting operation: make tapping back carbon content 〉=0.05%, phosphorus content≤0.015%, sulphur content≤0.025%; Adopt red packet, converter pushing off the slag tapping, electric furnace slag free tapping; Tapping adds silicon manganese dioxidation, add-on 700Kg; 1650 ℃ of tapping temperatures.
The LF refining procedure: refining time 40 minutes, refining process add carbon dust, silicomanganese, ferromanganese and ferrochrome and adjust chemical ingredients, 70 meters on refining later stage feeding CaSi line, and tapping temperature is controlled at 1590 ℃.
The VD degassing process: vacuum tightness is below 1 millibar, vacuum-treat 20 minutes, and after vacuum-treat finished, 20 minutes soft blow time, to impel field trash Shang Hu, tapping temperature was controlled at 1520 ℃.
The CCM continuous casting working procedure: the continuous casting section is set to 150mm * 150mm; Use the aluminium matter mouth of a river, implement total process protective casting; The target superheating temperature is less than 35 ℃, and is weak cold; Pulling rate is at 2.0m/min.
Rolling bar operation: continuously cast bloom by an inspection, is carried out reconditioning to defective continuously cast bloom and handles; 1100 ℃ of start rolling temperatures; Roll the back air cooling, avoid blowing to cause that round steel hardness is inhomogeneous.The steel temperature is chilled to 540, and bundling is collected after the no obvious red heat in steel surface, and cooling in heap is to room temperature.
Embodiment three
The production technique of embodiment three spring steel round steel comprises following operation: converter or electrosmelting, LF refining, the VD degassing, CCM continuous casting and rolling bar.
Converter or electrosmelting operation: make tapping back carbon content 〉=0.05%, phosphorus content≤0.015%, sulphur content≤0.025%; Adopt red packet, converter pushing off the slag tapping, electric furnace slag free tapping; Tapping adds silicon manganese dioxidation, add-on 700Kg; 1700 ℃ of tapping temperatures.
The LF refining procedure: refining time 45 minutes, refining process add carbon dust, silicomanganese, ferromanganese and ferrochrome and adjust chemical ingredients, 80 meters on refining later stage feeding CaSi line, and tapping temperature is controlled at 1590 ℃.
The VD degassing process: vacuum tightness is below 1 millibar, vacuum-treat 25 minutes, and after vacuum-treat finished, 25 minutes soft blow time, to impel field trash Shang Hu, tapping temperature was controlled at 1530 ℃.
The CCM continuous casting working procedure: the continuous casting section is set to 150mm * 150mm; Use the aluminium matter mouth of a river, implement total process protective casting; The target superheating temperature is less than 35 ℃, and is weak cold; Pulling rate is at 2.5m/min.
Rolling bar operation: continuously cast bloom by an inspection, is carried out reconditioning to defective continuously cast bloom and handles; 1120 ℃ of start rolling temperatures; Roll the back air cooling, avoid blowing to cause that round steel hardness is inhomogeneous.The steel temperature is chilled to 550 ℃, and bundling is collected after the no obvious red heat in steel surface, and cooling in heap is to room temperature.
Embodiment four
The production technique of embodiment four spring steel round steel comprises following operation: converter or electrosmelting, LF refining, the VD degassing, CCM continuous casting and rolling bar.
Converter or electrosmelting operation: make tapping back carbon content 〉=0.05%, phosphorus content≤0.015%, sulphur content≤0.025%; Adopt red packet, converter pushing off the slag tapping, electric furnace slag free tapping; Tapping adds silicon manganese dioxidation, add-on 750Kg; 1680 ℃ of tapping temperatures.
The LF refining procedure: refining time 50 minutes, refining process add carbon dust, silicomanganese, ferromanganese and ferrochrome and adjust chemical ingredients, 90 meters on refining later stage feeding CaSi line, and tapping temperature is controlled at 1600 ℃.
The VD degassing process: vacuum tightness is below 1 millibar, vacuum-treat 28 minutes, and after vacuum-treat finished, 28 minutes soft blow time, to impel field trash Shang Hu, tapping temperature was controlled at 1535 ℃.
The CCM continuous casting working procedure: the continuous casting section is set to 150mm * 150mm; Use the aluminium matter mouth of a river, implement total process protective casting; The target superheating temperature is less than 35 ℃, and is weak cold; Pulling rate is at 2.6m/min.
Rolling bar operation: continuously cast bloom by an inspection, is carried out reconditioning to defective continuously cast bloom and handles; 1120 ℃ of start rolling temperatures; Roll the back air cooling, avoid blowing to cause that round steel hardness is inhomogeneous.The steel temperature is chilled to 560 ℃, and bundling is collected after the no obvious red heat in steel surface, and cooling in heap is to room temperature.
Embodiment five
The production technique of embodiment five spring steel round steel comprises following operation: converter or electrosmelting, LF refining, the VD degassing, CCM continuous casting and rolling bar.
Converter or electrosmelting operation: make tapping back carbon content 〉=0.05%, phosphorus content≤0.015%, sulphur content≤0.025%; Adopt red packet, converter pushing off the slag tapping, electric furnace slag free tapping; Tapping adds silicon manganese dioxidation, add-on 780Kg; Tapping temperature 〉=1730 ℃.
The LF refining procedure: refining time 55 minutes, refining process add carbon dust, silicomanganese, ferromanganese and ferrochrome and adjust chemical ingredients, 90 meters on refining later stage feeding CaSi line, and tapping temperature is controlled at 1595 ℃.
The VD degassing process: vacuum tightness is below 1 millibar, vacuum-treat 28 minutes, and after vacuum-treat finished, 25 minutes soft blow time, to impel field trash Shang Hu, tapping temperature was controlled at 1535 ℃.
The CCM continuous casting working procedure: the continuous casting section is set to 150mm * 150mm; Use the aluminium matter mouth of a river, implement total process protective casting; The target superheating temperature is less than 35 ℃, and is weak cold; Pulling rate is at 2.8m/min.
Rolling bar operation: continuously cast bloom by an inspection, is carried out reconditioning to defective continuously cast bloom and handles; 1140 ℃ of start rolling temperatures; Roll the back air cooling, avoid blowing to cause that round steel hardness is inhomogeneous.The steel temperature is chilled to 570 ℃, and bundling is collected after the no obvious red heat in steel surface, and cooling in heap is to room temperature.
Embodiment six
The production technique of embodiment six spring steel round steel comprises following operation: converter or electrosmelting, LF refining, the VD degassing, CCM continuous casting and rolling bar.
Converter or electrosmelting operation: make tapping back carbon content 〉=0.05%, phosphorus content≤0.015%, sulphur content≤0.025%; Adopt red packet, converter pushing off the slag tapping, electric furnace slag free tapping; Tapping adds silicon manganese dioxidation, add-on 800Kg; 1690 ℃ of tapping temperatures.
The LF refining procedure: refining time 60 minutes, refining process add carbon dust, silicomanganese, ferromanganese and ferrochrome and adjust chemical ingredients, 100 meters on refining later stage feeding CaSi line, and tapping temperature is controlled at 1600 ℃.
The VD degassing process: vacuum tightness is below 1 millibar, vacuum-treat 30 minutes, and after vacuum-treat finished, 30 minutes soft blow time, to impel field trash Shang Hu, tapping temperature was controlled at 1540 ℃.
The CCM continuous casting working procedure: the continuous casting section is set to 150mm * 150mm; Use the aluminium matter mouth of a river, implement total process protective casting; The target superheating temperature is less than 35 ℃, and is weak cold; Pulling rate is at 3.0m/min.
Rolling bar operation: continuously cast bloom by an inspection, is carried out reconditioning to defective continuously cast bloom and handles; 1150 ℃ of open rolling temperature; Roll the back air cooling, avoid blowing to cause that round steel hardness is inhomogeneous.The steel temperature is chilled to 580 ℃, and bundling is collected after the no obvious red heat in steel surface, and cooling in heap is to room temperature.
The present invention can also have other embodiment, and the technical scheme that equal replacement of all employings or equivalent transformation form all drops within the scope of protection of present invention.
Claims (9)
1. spring steel round steel, it is characterized in that: comprise following composition: C:0.56%～0.64% by weight percentage, Si:1.60～2.00%, Mn:0.70%～1.00%, P :≤0.025%, S :≤0.025%, Cr:0.15%～0.35%, Ni :≤0.35%, Cu :≤0.25%, surplus is Fe.
2. the production technique of spring steel round steel according to claim 1 is characterized in that: comprise following operation: converter or electrosmelting, LF refining, the VD degassing, CCM continuous casting and rolling bar.
3. the production technique of spring steel round steel as claimed in claim 2 is characterized in that: described converter or electrosmelting operation: make tapping back carbon content 〉=0.05%, phosphorus content≤0.015%, sulphur content≤0.025%; Adopt red packet, converter pushing off the slag tapping, electric furnace slag free tapping; Tapping adds silicon manganese dioxidation; Tapping temperature 〉=1630 ℃.
4. the production technique of spring steel round steel as claimed in claim 3 is characterized in that: in described converter or the electrosmelting operation, tapping adds silicon manganese dioxidation, add-on 600～800Kg.
5. the production technique of spring steel round steel as claimed in claim 2, it is characterized in that: described LF refining procedure: refining time 30～60 minutes, refining process adds carbon dust, silicomanganese, ferromanganese and ferrochrome and adjusts chemical ingredients, 60～100 meters on refining later stage feeding CaSi line, tapping temperature is controlled at 1580～1600 ℃.
6. the production technique of spring steel round steel as claimed in claim 5 is characterized in that: in the described LF refining procedure, add carbon dust, silicomanganese, ferromanganese and ferrochrome and adjust chemical ingredients.
7. the production technique of spring steel round steel as claimed in claim 2, it is characterized in that: described VD degassing process: vacuum tightness is below 1 millibar, vacuum-treat 15～30 minutes, after vacuum-treat finishes, 10～30 minutes soft blow time, to impel field trash Shang Hu, tapping temperature is controlled at 1510～1540 ℃.
8. the production technique of spring steel round steel as claimed in claim 2, it is characterized in that: described CCM continuous casting working procedure: the continuous casting section is set to 150mm * 150mm; Use the aluminium matter mouth of a river, implement total process protective casting; The target superheating temperature is less than 35 ℃, and is weak cold; Pulling rate is at 1.5～3.0m/min.
9. the production technique of spring steel round steel as claimed in claim 2 is characterized in that: described rolling bar operation: continuously cast bloom by an inspection, is carried out reconditioning to defective continuously cast bloom and handles; 1050～1150 ℃ of start rolling temperatures; Roll the back air cooling, the steel temperature is chilled to about 530～580 ℃, and bundling is collected after the no obvious red heat in steel surface, and cooling in heap is to room temperature.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104145037A (en) * | 2012-03-07 | 2014-11-12 | 株式会社神户制钢所 | Steel wire rod with excellent spring workability for high-strength spring, process for manufacturing same, and high-strength spring |
| CN104745765A (en) * | 2015-03-26 | 2015-07-01 | 中天钢铁集团有限公司 | Smelting process of Cr-Mn series spring steel |
| EP2832891A4 (en) * | 2012-03-30 | 2016-04-27 | Kobe Steel Ltd | Steel wire rod with excellent shavability for high-strength spring, and high-strength spring |
| CN106947921A (en) * | 2017-03-20 | 2017-07-14 | 石家庄钢铁有限责任公司 | A kind of high-speed railway spring corrosion-resistant spring steel and its production method |
| CN107747060A (en) * | 2017-11-12 | 2018-03-02 | 湖南华菱湘潭钢铁有限公司 | The production method of high intensity high fatigue life spring steel |
| CN108750881A (en) * | 2018-06-19 | 2018-11-06 | 陕西省特种设备检验检测研究院 | A kind of vertical lift with shock-damping structure |
| CN111270155A (en) * | 2020-03-11 | 2020-06-12 | 南京钢铁股份有限公司 | Preparation method of spring steel hot-rolled steel strip for safety belt |
| CN111549287A (en) * | 2020-06-28 | 2020-08-18 | 宝钢特钢韶关有限公司 | Medium carbon steel and production process thereof |
| CN115537671A (en) * | 2021-06-30 | 2022-12-30 | 宝山钢铁股份有限公司 | Preparation method of valve spring steel |
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| CN1759976A (en) * | 2004-10-11 | 2006-04-19 | 杭州钢铁集团公司 | Technique for producing 55CrSi bull rod steel |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104145037A (en) * | 2012-03-07 | 2014-11-12 | 株式会社神户制钢所 | Steel wire rod with excellent spring workability for high-strength spring, process for manufacturing same, and high-strength spring |
| CN104145037B (en) * | 2012-03-07 | 2016-12-14 | 株式会社神户制钢所 | The steel wire for high-strength spring material of spring excellent in workability and manufacture method thereof and high-strength spring |
| EP2832891A4 (en) * | 2012-03-30 | 2016-04-27 | Kobe Steel Ltd | Steel wire rod with excellent shavability for high-strength spring, and high-strength spring |
| CN104745765A (en) * | 2015-03-26 | 2015-07-01 | 中天钢铁集团有限公司 | Smelting process of Cr-Mn series spring steel |
| CN106947921A (en) * | 2017-03-20 | 2017-07-14 | 石家庄钢铁有限责任公司 | A kind of high-speed railway spring corrosion-resistant spring steel and its production method |
| CN107747060A (en) * | 2017-11-12 | 2018-03-02 | 湖南华菱湘潭钢铁有限公司 | The production method of high intensity high fatigue life spring steel |
| CN108750881A (en) * | 2018-06-19 | 2018-11-06 | 陕西省特种设备检验检测研究院 | A kind of vertical lift with shock-damping structure |
| CN111270155A (en) * | 2020-03-11 | 2020-06-12 | 南京钢铁股份有限公司 | Preparation method of spring steel hot-rolled steel strip for safety belt |
| CN111270155B (en) * | 2020-03-11 | 2021-08-10 | 南京钢铁股份有限公司 | Preparation method of spring steel hot-rolled steel strip for safety belt |
| CN111549287A (en) * | 2020-06-28 | 2020-08-18 | 宝钢特钢韶关有限公司 | Medium carbon steel and production process thereof |
| CN115537671A (en) * | 2021-06-30 | 2022-12-30 | 宝山钢铁股份有限公司 | Preparation method of valve spring steel |
| CN115537671B (en) * | 2021-06-30 | 2023-09-12 | 宝山钢铁股份有限公司 | Preparation method of valve spring steel |
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| CN101928892B (en) | 2012-05-02 |
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