CN102268610A - Special steel for safety shoe anti-smash steel wrapping head, and its smelting method - Google Patents
Special steel for safety shoe anti-smash steel wrapping head, and its smelting method Download PDFInfo
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- CN102268610A CN102268610A CN2010101918883A CN201010191888A CN102268610A CN 102268610 A CN102268610 A CN 102268610A CN 2010101918883 A CN2010101918883 A CN 2010101918883A CN 201010191888 A CN201010191888 A CN 201010191888A CN 102268610 A CN102268610 A CN 102268610A
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Abstract
The invention relates to special steel for a safety shoe anti-smash steel wrapping head, and its smelting method. The special steel contains 0.25 to 0.35% of C, 0.005 to 0.02% of Cr, 0.2 to 1.0% of Mn, 0.01 to 0.32% of Si, 0.005 to 0.03% of Ni, 0.001 to 0.03% of Al, 0.005 to 0.01% of Zr, less than or equal to 0.045% of P, less than or equal to 0.045% of S and the balance Fe. The smelting method adopts molten iron conforming to the specified secondary standard GB717-82 for pig iron smelting and comprises adding molten SiZr3O, FeMn75#, FeCr67C600, Ni and Al under conditions of an end C content of 0.2%, a tapping temperature of 1700 DEG C and a tapping ratio of one-fifth to four-fifths, blowing argon, pouring billets through continuous casting, cooling under weak cooling intensity, rolling sheet materials, quenching in oil, quenching in air, quenching in water and carrying out tempering processing to obtain products. The special steel is added with Zr and Al and has tensile strength of 60 to 69 Kg/mm <2>. Compared with the existing steels, the special steel has high strength and hardenability, good plasticity in cold deformation and excellent cold working performances. Because of good deep drawability and the hardenability of the special steel, a one-time yield is improved so that manpower and material resources are saved greatly and a smelting cost is reduced.
Description
Technical field
The present invention relates to a kind of safety shoe antisquashy steel wrapping head special-purpose steel and smelting process thereof.
Background technology
Because people's the improving constantly of awareness of safety in recent years, the demand of labour protection safety shoes also climbs up and up, and is also more and more higher to the requirement of its safety performance simultaneously.The anti-demand of pounding safety shoes in the whole world has reached 9,000 ten thousand pairs, and the product that particularly exports to European Union is also more and more, export in a large number bring golden eggs for the safety shoes industry in, also brought great challenge to the sector.Because the at present domestic steel that also do not have the special production of a tame steel industry to be fit to make steel toes, so all be to substitute all the time with general steel plate, such result is exactly that a large amount of product is defective, just begin to attempt replacing in order to solve some steel toes manufacturers of product quality problem, so because these low alloy steel are not the instabilities that quality product just occurred that specialty designs for the sector with some low alloy steel.
Low alloy steel commonly used has u20202 (7 in the contrast steel grade), u20252 (8 in the contrast steel grade), 30Mn (9 in the contrast steel grade), 35Mn (10 in the contrast steel grade) etc.U20202 intensity and hardness are general, and plasticity is good, good toughness, but must increase thickness with this material, otherwise product is very difficult up to standard, will increase the weight of the cost and the labour protection footwear of material like this.U20252 has certain intensity, hardness, plasticity and good toughness, and weldability, cold plasticity processibility are higher, but hardening capacity, hardenability are relatively poor.30Mn has higher intensity and hardening capacity, and plasticity is good during cold deformation, but temper brittleness and superheated susceptivity are arranged during thermal treatment.35Mn intensity, hardening capacity are better than 30Mn, but cold deformation is relatively poor, is prone to crackle during the punching press crimping.All there are some problems in above material, causes unstable product quality.
Summary of the invention
The objective of the invention is at above-mentioned present situation, aim to provide a kind of have higher-strength and hardening capacity, plasticity is good during cold deformation, and the safety shoe antisquashy steel wrapping head special-purpose steel and the smelting process thereof of good cold-forming property, deep drawability and through hardening performance arranged.
The implementation of the object of the invention is, a kind of safety shoe antisquashy steel wrapping head special-purpose steel, its content % is C0.25～0.35%, Cr 0.005～0.02%, Mn 0.2～1.0%, Si 0.01～0.32%, and Ni 0.005～0.03%, and Al 0.001～0.03%, Zr 0.005～0.01%, P≤0.045, S≤0.045, all the other are Fe.
A kind of smelting process of safety shoe antisquashy steel wrapping head special-purpose steel, employing meets the molten iron of GB717-82 ironmaking pig iron regulation secondary standard, molten iron temperature is higher than 1200 ℃, slag charge 90kg/ ton steel, terminal point C content is controlled at 0.2%, tapping temperature is controlled at 1700 ℃, add the fused alloy between tapping 1/5～4/5, alloy addition is: SiZr30 1～3kg/ ton steel, FeMn75# 4～8kg/ ton steel, FeCr67C600 1～3kg/ ton steel, Ni 0.6～2kg/ ton steel, Al 2～6kg/ ton steel was then delivered to the chain-wales blowing argon gas 5 minutes with buggy ladle, blowing argon gas pressure 0.2Mpa
Continuous casting steel billet, middle bag temperature be more than 1500 ℃, slab 150～1050mm, and pulling rate 1m/min, weak but cold,
Be rolled into the thick sheet material of 1.2mm in 900～1350 ℃, through 850～1100 ℃ of quenching-oil quenchings, air quenching, shrend, then through 200～850 ℃ of temper, the safety shoe antisquashy steel wrapping head special-purpose steel,
The molten iron slag charge is lime and fluorite.
Added Zr and Al in the special-purpose steel of the present invention, its tensile strength is 60～69Kg/mm
2, comparing it with some now all steel grades has higher intensity and hardening capacity, and plasticity is good during cold deformation, more superior cold-forming property is arranged, deep drawability that it is good and through hardening performance make produces disposable yield rate height, has saved great amount of manpower and material resources, and smelting cost is low.
Embodiment
The content % of special-purpose steel of the present invention is C 0.25～0.35%, and Cr 0.005～0.02%, and Mn 0.2～1.0%, and Si 0.01～0.32%, Ni 0.005～0.03%, and Al 0.001～0.03%, and Zr 0.005～0.01%, P≤0.045, S≤0.045, all the other are Fe.
Special-purpose steel optimum content % is C 0.26～0.31%, Cr 0.01～0.02%, Mn 0.35～0.6%, Si 0.01～0.03%, Ni 0.01～0.03%, Al 0.01～0.03%, Zr 0.005%, P 0.02～0.03, S 0.02～0.03, all the other are Fe.
Carbon containing in the special-purpose steel, carbon are the elements of stable austenite phase, can obtain required intensity after quenching, the tempering, and its content need be controlled between 0.25～0.35%, the too high toughness that can reduce steel.Contain Cr, can improve hardenability and tempering resistance, improve intensity and soak carbon, and form fine carbide, suppress grain growing, improve toughness.Contain Mn, can improve the intensity and the hardening capacity of steel.Si content is controlled between 0.01～0.03%, can make tempered martensite fragility low ebb to the skew of high temperature direction when Si exceeds 0.03%, thereby influence the cold stamping performance.Contain Ni, but crystal grain thinning also improves the intensity of steel simultaneously at the flexible that improves steel, improves the low temperature intensity and the heat treatment performance of steel.Contain Al, Al simultaneously can also crystal grain thinning as reductor.Contain Zr, the austenite crystal of Zr refinement steel, the low-temperature flexibility of raising steel.
Smelting process is to adopt the molten iron of GB717-82 ironmaking pig iron regulation secondary standard, terminal point C content is 0.2%, between 1700 ℃ of tappings 1/5～4/5, add fused SiZr30, FeMn75#, FeCr67C600, Ni and Al, blowing argon gas, the continuous casting steel billet, weak but cold, rolled plate, through oil quenching, air quenching, shrend, tempered then processing gets the safety shoe antisquashy steel wrapping head special-purpose steel.
Enumerate the specific embodiment of the invention below:
Example 1, meet the molten iron of GB717-82 ironmaking pig iron regulation secondary standard, 1200 ℃ of molten iron temperatures, slag charge 90kg/ ton steel, terminal point C content is controlled at 0.25%, tapping temperature is controlled at 1700 ℃, between tapping 1/5～4/5, add alloy, SiZr30 1kg/ ton steel with the medium-frequency induction furnace fusing; FeMn75#5kg/ ton steel; FeCr67C600 1kg/ ton steel; Ni 0.6kg/ ton steel; Al 6kg/ ton steel.Delivered to the chain-wales blowing argon gas 5 minutes with buggy ladle, blowing argon gas pressure 0.2Mpa.
The continuous casting steel billet, middle bag temperature is controlled at more than 1500 ℃, slab 120 * 120mm, pulling rate 2.5m/min, weak but cold.900～1350 ℃ are rolled into 1.2mm sheet material, then through 600 ℃ of temper, get the safety shoe antisquashy steel wrapping head special-purpose steel through 850～1100 ℃ of quenchings (oil quenching, air quenching, shrend).The content % of special-purpose steel is C 0.26%, and Cr 0.01%, and Mn 0.35%, and Si 0.01%, and Ni 0.01%, and Al 0.03%, and Zr 0.005%, and P 0.03, and S 0.03, all the other Fe and unavoidable impurities.
Example 2, with example 1, different is, terminal point C content is controlled at 0.26%, alloy addition is: SiZr30 2kg/ ton steel; FeMn75# 6kg/ ton steel; FeCr67C600 1kg/ ton steel; Ni 0.6kg/ ton steel; Al 6kg/ ton steel.Delivered to the chain-wales blowing argon gas 5 minutes with buggy ladle, blowing argon gas pressure 0.2Mpa.
The continuous casting steel billet, middle bag temperature is controlled at more than 1500 ℃, square billet 120 * 120mm, pulling rate 2.5m/min is weak but cold.Get the safety shoe antisquashy steel wrapping head special-purpose steel, the content % of special-purpose steel is C 0.27%, and Cr 0.02%, and Mn 0.4%, and Si 0.02%, and Ni 0.01%, and Al 0.03%, and Zr 0.01%, and P 0.03, and S 0.02, all the other Fe and unavoidable impurities.
Example 3, with example 1, different is, terminal point C content is controlled at 0.27% adds the fused alloy between tapping 1/5～4/5, alloy addition is: SiZr30 3kg/ ton steel; FeMn75# 6.5kg/ ton steel; FeCr67C600 1.5kg/ ton steel; Ni 0.7kg/ ton steel; Al 5.5kg/ ton steel was delivered to the chain-wales blowing argon gas 5 minutes with buggy ladle, blowing argon gas pressure 0.2Mpa.
The continuous casting steel billet, middle bag temperature is controlled at more than 1500 ℃, square billet 120 * 120mm, pulling rate 2.5m/min is weak but cold.Get the safety shoe antisquashy steel wrapping head special-purpose steel, the content % of special-purpose steel is C 0.28%, and Cr 0.01%, and Mn 0.45%, and Si 0.03%, and Ni 0.02%, and Al 0.025%, and Zr 0.015%, P0.02, and S 0.03, all the other Fe and unavoidable impurities.
Example 4, terminal point C content is controlled at 0.28% adds the fused alloy between tapping 1/5～4/5, alloy addition is: SiZr30 4kg/ ton steel; FeMn75# 7kg/ ton steel; FeCr67C600 1.5kg/ ton steel; Ni 0.7kg/ ton steel; Al 5kg/ ton steel was delivered to the chain-wales blowing argon gas 5 minutes with buggy ladle, blowing argon gas pressure 0.2Mpa.
The continuous casting steel billet, middle bag temperature is controlled at more than 1500 ℃, square billet 120 * 120mm, pulling rate 2.5m/min is weak but cold.Get the safety shoe antisquashy steel wrapping head special-purpose steel, the content % of special-purpose steel is C 0.29%, and Cr 0.02%, and Mn 0.5%, and Si 0.04%, and Ni 0.02%, and Al 0.02%, and Zr 0.02%, and P 0.02, and S 0.02, all the other Fe and unavoidable impurities.
Example 5, with example 1, different is, terminal point C content is controlled at 0.29% adds the fused alloy between tapping 1/5～4/5, alloy addition is: SiZr30 5kg/ ton steel; FeMn75# 7.5kg/ ton steel; FeCr67C600 1.5kg/ ton steel; Ni 0.8kg/ ton steel; Al 4.5kg/ ton steel was delivered to the chain-wales blowing argon gas 5 minutes with buggy ladle, blowing argon gas pressure 0.2Mpa.
The continuous casting steel billet, middle bag temperature is controlled at more than 1500 ℃, square billet 120 * 120mm, pulling rate 2.5m/min is weak but cold.Get the safety shoe antisquashy steel wrapping head special-purpose steel, the content % of special-purpose steel is C 0.30%, and Cr 0.02%, and Mn 0.55%, and Si 0.05%, and Ni 0.03%, and Al 0.015%, and Zr 0.025%, P0.03, and S 0.03, all the other Fe and unavoidable impurities.
Example 6,, terminal point C content be controlled at 0.28% between tapping 1/5～4/5, add the fused alloy, alloy addition is: SiZr30 6kg/ ton steel; FeMn75# 8kg/ ton steel; FeCr67C600 1.5kg/ ton steel; Ni 0.8kg/ ton steel; Al 4kg/ ton steel was delivered to the chain-wales blowing argon gas 5 minutes with buggy ladle, blowing argon gas pressure 0.2Mpa.
The continuous casting steel billet, middle bag temperature is controlled at more than 1500 ℃, square billet 120 * 120mm, pulling rate 2.5m/min is weak but cold.Get the safety shoe antisquashy steel wrapping head special-purpose steel, the content % of special-purpose steel is C 0.31%, and Cr 0.02%, and Mn 0.6%, and Si 0.06%, and Ni 0.03%, and Al 0.01%, and Zr 0.03%, and P 0.03, and S 0.02, all the other Fe and unavoidable impurities.
900～1350 ℃ are rolled into 1.2mm sheet material, through 850～1100 ℃ of quenchings (oil quenching, air quenching, shrend) then through 600 ℃ of temper,
The applicant has done with the routine 1-example 6 of the present invention's production and the simultaneous test of existing steel grade content %, and test-results sees Table 1.
Table 1
Done with the safety shoe antisquashy steel wrapping head special-purpose steel of the present invention's production and the simultaneous test of existing steel grade mechanical property, test-results sees Table 2.
Table 2
Claims (3)
1. safety shoe antisquashy steel wrapping head special-purpose steel, it is characterized in that its content % is C 0.25～0.35%, Cr 0.005～0.02%, and Mn 0.2～1.0%, and Si 0.01～0.32%, Ni 0.005～0.03%, Al0.001～0.03%, Zr 0.005～0.01%, P≤0.045, S≤0.045, all the other are Fe.
2. safety shoe antisquashy steel wrapping head special-purpose steel, it is characterized in that content % is C 0.26～0.31%, Cr 0.01～0.02%, Mn 0.35～0.6%, Si 0.01～0.03%, Ni 0.01～0.03%, Al0.01～0.03%, Zr 0.005%, P 0.02～0.03, S 0.02～0.03, all the other are Fe.
3. smelt the method for a kind of claim 1 and 2 described safety shoe antisquashy steel wrapping head special-purpose steel, it is characterized in that adopting the molten iron that meets GB717-82 ironmaking pig iron regulation secondary standard, molten iron temperature is higher than 1200 ℃, slag charge 90kg/ ton steel, terminal point C content is controlled at 0.2%, tapping temperature is controlled at 1700 ℃, add the fused alloy between tapping 1/5～4/5, alloy addition is: SiZr30 1～3kg/ ton steel, FeMn75# 4～8kg/ ton steel, FeCr67C600 1～3kg/ ton steel, Ni 0.6～2kg/ ton steel, Al 2～6kg/ ton steel was then delivered to the chain-wales blowing argon gas 5 minutes with buggy ladle, blowing argon gas pressure 0.2Mpa
Continuous casting steel billet, middle bag temperature be more than 1500 ℃, slab 150～1050mm, and pulling rate 1m/min, weak but cold,
Be rolled into the thick sheet material of 1.2mm in 900～1350 ℃, through 850～1100 ℃ of quenching-oil quenchings, air quenching, shrend, then through 200～850 ℃ of temper, the safety shoe antisquashy steel wrapping head special-purpose steel,
The molten iron slag charge is lime and fluorite.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101918883A CN102268610A (en) | 2010-06-04 | 2010-06-04 | Special steel for safety shoe anti-smash steel wrapping head, and its smelting method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101918883A CN102268610A (en) | 2010-06-04 | 2010-06-04 | Special steel for safety shoe anti-smash steel wrapping head, and its smelting method |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09111405A (en) * | 1995-10-11 | 1997-04-28 | Toa Steel Co Ltd | Low strain type carburized and quenched steel stock for gear |
| CN1308144A (en) * | 2000-12-25 | 2001-08-15 | 钢铁研究总院 | High-performance impact resisting steel |
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2010
- 2010-06-04 CN CN2010101918883A patent/CN102268610A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09111405A (en) * | 1995-10-11 | 1997-04-28 | Toa Steel Co Ltd | Low strain type carburized and quenched steel stock for gear |
| CN1308144A (en) * | 2000-12-25 | 2001-08-15 | 钢铁研究总院 | High-performance impact resisting steel |
Non-Patent Citations (1)
| Title |
|---|
| 冶金部钢铁研究总院: "《国外低合金钢、合金钢》", 31 December 1986 * |
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Application publication date: 20111207 |