CN104498830A - Novel alloy structure steel and preparation method thereof - Google Patents
Novel alloy structure steel and preparation method thereof Download PDFInfo
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- CN104498830A CN104498830A CN201410838703.1A CN201410838703A CN104498830A CN 104498830 A CN104498830 A CN 104498830A CN 201410838703 A CN201410838703 A CN 201410838703A CN 104498830 A CN104498830 A CN 104498830A
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Abstract
The invention discloses novel alloy structure steel and a preparation method thereof. The novel alloy structure steel comprises the following chemical components in percentage by mass: 0.42%-0.48% of C, 0.20%-0.35% of Si, 0.90%-1.20% of Mn, no more than 0.018% of P, no more than 0.005% of S, 0.90%-1.20% of Cr, 0.25%-0.35% of Mo, 0.20%-0.40% of Als, 0.0008%-0.0015% of B and the balance of Fe and residual elements. The preparation method comprises the following steps: converter smelting, LF refining, vacuum refining, die casting pouring, steel ingot heating, rolling, retarded cooling, and thermal treatment. Through reasonable design on chemical components, the cleanness of the steel is ensured by LF and VD processes; the yield strength is controlled at 985-1250MPa through the processes of heating, rolling, thermal treatment and the like; the tensile strength is controlled at 1280-1450MPa; the elongation at break is controlled at 13-17%; the CV-type impact energy at 20 DEG C is controlled at 100-150J; and the Brinell hardness in a high-temperature tempering state is 215-245. Various performance indexes of the novel alloy structure steel completely meet the operating requirements as a gear shaft in a new environment.
Description
Technical field
The invention belongs to Plate Production field, relate to a kind of novel alloy structure iron and production method thereof.
Background technology
Structural alloy steel is general because having higher intensity and toughness, is widely used in manufacturing.Along with the change of materials'use operating environment, as certain device fabrication enterprise uses a kind of structural alloy steel to make gear shaft, but affect by operating environment, the structural alloy steel material needing Plate Production producer to provide has higher intensity and toughness, in this context, according to customer demand, develop a kind of novel structural alloy steel, to meet working conditions.
Summary of the invention
The invention reside in and a kind of composition of novel alloy structure iron and the production method of steel plate are provided.
In the technical scheme that the present invention takes, novel alloy structural steel and iron comprises the chemical composition (unit, wt%) of following mass percent:
C:0.42 ~ 0.48, Si:0.20 ~ 0.35, Mn:0.90 ~ 1.20, P :≤0.018, S :≤0.005, Cr:0.90 ~ 1.20, Mo:0.25 ~ 0.35, Als:0.20 ~ 0.40, B:0.0008 ~ 0.0015, other is Fe and relict element.
For achieving the above object, the production method that the present invention takes comprises: converter smelting, LF refining, vacuum refinement, die casting cast, Heating Steel Ingots, rolling, slow cooling, thermal treatment; In converter smelting process, converter terminal tapping carbon >=0.08%, tapping P≤0.015%, S≤0.012%, ferrosilicoaluminum taked by tapping process reductor, add-on controls according to 1.0Kg/t steel, point blows number of times and must not be greater than 2 times, avoids tapping process slag, adds 2.0m/t steel-aluminium conductor after molten steel to argon station, aluminum steel is leaving from station after adding soft blow argon 3min, temperature >=1570 DEG C leaving from station; In LF refinery practice, the large quantity of slag is taked to carry out slag making, refining one is heated and is terminated slag and must to bleach or yellowish-white, white slag hold-time >=30min, the foam white slag that the finishing slag requiring refining to terminate is good fluidity, viscosity is suitable, the requirement of refining total time controls at 60 ~ 80min, after LF refining terminates, molten steel carries out deslagging process, and deslagging amount is 1/2 ~ 2/3, after deslagging terminates, molten steel is hung carry out vacuum-treat toward VD immediately; In vacuum refining process, after molten steel opens argon gas break shell to VD station, the silico-calcium block of 1.1Kg/t steel is added in ladle, dwell time under≤67Pa controls by 22min, require that pressure maintaining period molten steel seethes respond well simultaneously, carry out Ca process immediately after vacuum breaker, modification is carried out to inclusion, after soft blow 5min, hang steel; In pouring technology, employing die casting is poured into a mould, superheating temperature controls at 25 ~ 30 DEG C, body cast 15 ~ 18min, cap mouth cast 4 ~ 6min, casting process note speed control system: open water steady, tightly guarantee that molten steel can be poured into a mould smoothly with stream, open water stable after, according to steel liquid surface height controlling note speed, avoid incremental or subtract flow through suddenly prevent steel scatter; In heating process, steel ingot temperature is shove charge heating 600 ~ 800 DEG C time, and stewing steel 1.5h after entering stove, starts after stewing steel terminates to heat up, wherein 800 ~ 850 DEG C, heat-up rate 40 ~ 60 DEG C/h, 850 ~ 1000 DEG C, heat-up rate 60 ~ 80 DEG C/h, 1000 ~ 1260 DEG C, heat-up rate 80 ~ 100 DEG C/h, steel ingot maximum heating temperature controls at 1260 DEG C, insulation 2h; In rolling technology, rough rolling step start rolling temperature 1000 DEG C ~ 1100 DEG C, reduction in pass 35mm ~ 45mm, finish rolling stage start rolling temperature 890 ~ 950 DEG C, reduction in pass is 15 ~ 20mm, finishing temperature 860 ~ 920 DEG C; In retarded cooling process, enter burial pit temperature 400 DEG C, 48 hours slow cooling time; In thermal treatment process, steel plate adopts tempering process process, tempering temperature 650 DEG C, soaking time 4min/mm; Blank sample adopts hardening and tempering process, and quenching and preserving heat temperature 900 DEG C, 2mim/mm during insulation, oil quenching is to normal temperature.Tempering holding temperature 650 DEG C, soaking time 4min/mm.
By rational chemical composition design, LF+VD technique ensures the cleanliness factor of steel, and is effectively implemented by techniques such as heating, rolling and thermal treatments, successfully have developed≤this novel alloy structure iron of 100 mm.Its yield strength controls at 985 ~ 1250MPa, and tensile strength controls at 1280 ~ 1450 MPa; Elongation controls 13 ~ 17%; 20 DEG C of V-type ballistic works control at 100 ~ 150 J; High temperature temper condition Brinell hardness 215 ~ 245.Property indices meets the service requirements as gear shaft under new environment completely.
Embodiment
1, composition
In technical scheme, the novel alloy structure iron of below thickness 100mm comprises the chemical composition (unit, wt%) of following mass percent:
C:0.42 ~ 0.48, Si:0.20 ~ 0.35, Mn:0.90 ~ 1.20, P :≤0.018, S :≤0.005, Cr:0.90 ~ 1.20, Mo:0.25 ~ 0.35, Als:0.20 ~ 0.40, B:0.0008 ~ 0.0015, other is Fe and relict element.
2, technology controlling and process emphasis
2.1 the requirement of converter smelting process point
Converter terminal tapping carbon >=0.08%, tapping P≤0.015%, S≤0.012%.Ferrosilicoaluminum taked by tapping process reductor, and add-on controls according to 1.0Kg/t steel.Point blows number of times and must not be greater than 2 times, avoids tapping process slag.Add 2.0m/t steel-aluminium conductor after molten steel to argon station, aluminum steel is leaving from station after adding soft blow argon 3min, temperature >=1570 DEG C leaving from station.
2.2 LF refinery practice point requirements
Take the large quantity of slag to carry out slag making, refining one is heated and is terminated slag and must to bleach or yellowish-white, white slag hold-time >=30min, the foam white slag that the finishing slag requiring refining to terminate is good fluidity, viscosity is suitable, the requirement of refining total time controls at 60 ~ 80min.After LF refining terminates, molten steel carries out deslagging process, and deslagging amount is 1/2 ~ 2/3, after deslagging terminates, and is hung by molten steel immediately and carries out vacuum-treat toward VD.
2.3 vacuum refining process point requirements
After molten steel opens argon gas break shell to VD station, add the silico-calcium block of 1.1Kg/t steel in ladle, the dwell time under≤67Pa controls by 22min, requires that pressure maintaining period molten steel seethes respond well simultaneously.Carry out Ca process immediately after vacuum breaker, modification is carried out to inclusion, after soft blow 5min, hang steel.
2.4 pouring technology main points
Employing die casting is poured into a mould, and superheating temperature controls at 25 ~ 30 DEG C, body cast 15 ~ 18min, cap mouth cast 4 ~ 6min.Casting process note speed control system: open to water and surely, with stream tightly guarantee that molten steel can be poured into a mould smoothly.Open water stable after, according to steel liquid surface height controlling note speed, avoid incremental or subtract to flow through and suddenly prevent steel from scattering.
2.4 heating process main points
Steel ingot temperature is shove charge heating 600 ~ 800 DEG C time, stewing steel 1.5h after entering stove.Start after stewing steel terminates to heat up, wherein 800 ~ 850 DEG C, heat-up rate 40 ~ 60 DEG C/h, 850 ~ 1000 DEG C, heat-up rate 60 ~ 80 DEG C/h, 1000 ~ 1260 DEG C, heat-up rate 80 ~ 100 DEG C/h.Steel ingot maximum heating temperature controls at 1260 DEG C, insulation 2h.
2.5 Main points of rolling process
Rough rolling step start rolling temperature 1000 DEG C ~ 1100 DEG C, reduction in pass 35mm ~ 45mm.Finish rolling stage start rolling temperature 890 ~ 950 DEG C, reduction in pass is 15 ~ 20mm, finishing temperature 860 ~ 920 DEG C.
2.6 retarded cooling process main points
Enter burial pit temperature 400 DEG C, 48 hours slow cooling time.
2.7 thermal treatment process main points
Steel plate adopts tempering process process, tempering temperature 650 DEG C, soaking time 4min/mm.
Blank sample adopts hardening and tempering process, and quenching and preserving heat temperature 900 DEG C, 2mim/mm during insulation, oil quenching is to normal temperature.Tempering holding temperature 650 DEG C, soaking time 4min/mm.
Embodiment
By techniques such as converter smelting, LF refining, vacuum refinement, cast, heating, rolling, slow cooling, thermal treatments, obtain the novel alloy structure iron finished steel plate being described in table 1 below chemical composition, wherein each processing parameter and mechanical property are shown in as following table 1,2.
Table 1 chemical composition
The mechanical mechanics property that table 2 sample is modified
By rational chemical composition design, LF+VD technique ensures the cleanliness factor of steel, and is effectively implemented by techniques such as heating, rolling and thermal treatments, successfully have developed≤this novel alloy structure iron of 100 mm.Its yield strength controls at 985 ~ 1250MPa, and tensile strength controls at 1280 ~ 1450 MPa; Elongation controls at 13%-17%; 20 DEG C of V-type ballistic works control at 100 ~ 150 J; High temperature temper condition Brinell hardness 215 ~ 245.Property indices meets the service requirements of client completely.
Claims (2)
1. a novel alloy structure iron, it comprises the chemical composition of following mass percent:
C:0.42 ~ 0.48, Si:0.20 ~ 0.35, Mn:0.90 ~ 1.20, P :≤0.018, S :≤0.005, Cr:0.90 ~ 1.20, Mo:0.25 ~ 0.35, Als:0.20 ~ 0.40, B:0.0008 ~ 0.0015, other is Fe and relict element.
2. a production method for novel alloy structure iron as claimed in claim 1, its production method taked comprises: converter smelting, LF refining, vacuum refinement, die casting cast, Heating Steel Ingots, rolling, slow cooling, thermal treatment; It is characterized in that in converter smelting process, converter terminal tapping carbon >=0.08%, tapping P≤0.015%, S≤0.012%, ferrosilicoaluminum taked by tapping process reductor, add-on controls according to 1.0Kg/t steel, point blows number of times and must not be greater than 2 times, avoids tapping process slag, adds 2.0m/t steel-aluminium conductor after molten steel to argon station, aluminum steel is leaving from station after adding soft blow argon 3min, temperature >=1570 DEG C leaving from station; In LF refinery practice, the large quantity of slag is taked to carry out slag making, refining one is heated and is terminated slag and must to bleach or yellowish-white, white slag hold-time >=30min, the foam white slag that the finishing slag requiring refining to terminate is good fluidity, viscosity is suitable, the requirement of refining total time controls at 60 ~ 80min, after LF refining terminates, molten steel carries out deslagging process, and deslagging amount is 1/2 ~ 2/3, after deslagging terminates, molten steel is hung carry out vacuum-treat toward VD immediately; In vacuum refining process, after molten steel opens argon gas break shell to VD station, the silico-calcium block of 1.1Kg/t steel is added in ladle, dwell time under≤67Pa controls by 22min, require that pressure maintaining period molten steel seethes respond well simultaneously, carry out Ca process immediately after vacuum breaker, modification is carried out to inclusion, after soft blow 5min, hang steel; In pouring technology, employing die casting is poured into a mould, superheating temperature controls at 25 ~ 30 DEG C, body cast 15 ~ 18min, cap mouth cast 4 ~ 6min, casting process note speed control system: open water steady, tightly guarantee that molten steel can be poured into a mould smoothly with stream, open water stable after, according to steel liquid surface height controlling note speed, avoid incremental or subtract flow through suddenly prevent steel scatter; In heating process, steel ingot temperature is shove charge heating 600 ~ 800 DEG C time, and stewing steel 1.5h after entering stove, starts after stewing steel terminates to heat up, wherein 800 ~ 850 DEG C, heat-up rate 40 ~ 60 DEG C/h, 850 ~ 1000 DEG C, heat-up rate 60 ~ 80 DEG C/h, 1000 ~ 1260 DEG C, heat-up rate 80 ~ 100 DEG C/h, steel ingot maximum heating temperature controls at 1260 DEG C, insulation 2h; In rolling technology, rough rolling step start rolling temperature 1000 DEG C ~ 1100 DEG C, reduction in pass 35mm ~ 45mm, finish rolling stage start rolling temperature 890 ~ 950 DEG C, reduction in pass is 15 ~ 20mm, finishing temperature 860 ~ 920 DEG C; In retarded cooling process, enter burial pit temperature 400 DEG C, 48 hours slow cooling time; In thermal treatment process, steel plate adopts tempering process process, tempering temperature 650 DEG C, soaking time 4min/mm; Blank sample adopt hardening and tempering process, quenching and preserving heat temperature 900 DEG C, 2mim/mm during insulation, oil quenching to normal temperature, tempering holding temperature 650 DEG C, soaking time 4min/mm.
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Cited By (5)
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| CN104827016A (en) * | 2015-04-16 | 2015-08-12 | 中原特钢股份有限公司 | Die casting pit design of vehicle-mounted die casting steel pouring system |
| CN105855485A (en) * | 2016-05-31 | 2016-08-17 | 舞阳钢铁有限责任公司 | Die casting method for medium carbon steel large ingot slab |
| CN112481546A (en) * | 2020-11-26 | 2021-03-12 | 南阳汉冶特钢有限公司 | Production method of steel plate P20 for extra-thick plastic mold |
| CN112962027A (en) * | 2021-02-01 | 2021-06-15 | 建龙北满特殊钢有限责任公司 | Optimized machining method of alloy structural steel |
| CN113699448A (en) * | 2021-08-27 | 2021-11-26 | 中冶陕压重工设备有限公司 | Low-alloy structural steel SY41CrMnMoNbVTi and preparation method thereof |
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| CN102345071A (en) * | 2011-07-08 | 2012-02-08 | 南阳汉冶特钢有限公司 | Steel plate of alloy structural steel 30CrMo added with B and its production method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104827016A (en) * | 2015-04-16 | 2015-08-12 | 中原特钢股份有限公司 | Die casting pit design of vehicle-mounted die casting steel pouring system |
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| CN112481546A (en) * | 2020-11-26 | 2021-03-12 | 南阳汉冶特钢有限公司 | Production method of steel plate P20 for extra-thick plastic mold |
| CN112481546B (en) * | 2020-11-26 | 2022-06-14 | 南阳汉冶特钢有限公司 | Production method of steel plate P20 for extra-thick plastic mold |
| CN112962027A (en) * | 2021-02-01 | 2021-06-15 | 建龙北满特殊钢有限责任公司 | Optimized machining method of alloy structural steel |
| CN113699448A (en) * | 2021-08-27 | 2021-11-26 | 中冶陕压重工设备有限公司 | Low-alloy structural steel SY41CrMnMoNbVTi and preparation method thereof |
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| CN104498830B (en) | 2017-06-23 |
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