CN106191648A - A kind of 65Si2CrVA spring steel and production technology thereof - Google Patents

A kind of 65Si2CrVA spring steel and production technology thereof Download PDF

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Publication number
CN106191648A
CN106191648A CN201610530420.XA CN201610530420A CN106191648A CN 106191648 A CN106191648 A CN 106191648A CN 201610530420 A CN201610530420 A CN 201610530420A CN 106191648 A CN106191648 A CN 106191648A
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China
Prior art keywords
spring steel
65si2crva
production technology
steel
vacuum
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CN201610530420.XA
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Chinese (zh)
Inventor
余昌国
李红杰
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Anhui Hongqiao Metal Manufacturing Co Ltd
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Anhui Hongqiao Metal Manufacturing Co Ltd
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Priority to CN201610530420.XA priority Critical patent/CN106191648A/en
Publication of CN106191648A publication Critical patent/CN106191648A/en
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/009—Pearlite

Abstract

The invention discloses a kind of 65Si2CrVA spring steel and production technology thereof, include following composition: C:0.52～0.60% by weight percentage, Si:1.40～2.00%, Mn:0.70～1.00%, P :≤0.025%, S :≤0.025%, Cr:0.15～0.35%, Ni :≤0.10%, Cu :≤0.25%, surplus is Fe and inevitable impurity.Production technology includes following operation: electric furnace smelting LF refine vacuum outgas continuous casting slow cooling rolling bar heat treatment essence inspection performance detection packaging is put in storage.The 65Si2CrVA spring steel of the present invention has that decarburizing tendency is little, temper resistance is good, hot-working character is good, the feature such as function admirable after heat treatment, spring steel round steel has good cold-forming property under the conditions of rolling rear air cooling, have during cold working good mould, toughness, reduce hot-working cost.

Description

A kind of 65Si2CrVA spring steel and production technology thereof
Technical field
The present invention relates to spring steel field, a kind of 65Si2CrVA spring steel and production technology thereof.
Background technology
Spring is a kind of machine components utilizing elasticity to carry out work.The part made with elastomeric material is sent out under external force Raw deformation, restores to the original state again after removing external force.Also " spring " is made.It is the critical elements of mechanization, automatization that spring has, widely It is applied to the industries such as aerospace, machine-building, transportation and instrument and meter.General spring steel is made.
Spring steel 65Si2CrVA alloying element content is low, and decarburizing tendency is little, and temper resistance is good, hot-working character is good, Low cost, function admirable after heat treatment, it is widely used in the industries such as automobile, railway and engineering machinery.But when producing spring steel, Often pro-eutectoid can go out ferrite net under the conditions of air cooling, cause plasticity and toughness degradation, cold working process is easily broken, Yi Zao Becoming personal injury, hot-working adds again substantial amounts of heat treatment cost.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of 65Si2CrVA spring steel and production technology thereof.Spring steel Include following composition: C:0.52～0.60% by weight percentage, Si:1.40～2.00%, 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 and can not keep away The impurity exempted from.Its production technology improved can make spring steel round steel have good cold-forming property under the conditions of rolling rear air cooling, Have during cold working good mould, toughness, reduce hot-working cost.
Preferably, the production technology of a kind of 65Si2CrVA spring steel, including following operation: electric furnace smelting-LF refine-true Empty degassing-continuous casting-slow cooling-rolling bar-heat treatment-essence inspection-performance detection-packaging warehouse-in.
Preferably, the production technology of a kind of 65Si2CrVA spring steel, described electric furnace smelting operation: red packet slag free tapping, Make C >=0.05% after tapping, P≤0.010%, S≤0.020%, determine oxygen: [O]≤600ppm.
Preferably, the production technology of a kind of 65Si2CrVA spring steel, described LF refining procedure: use in refining process Aluminium deoxidation, uses SiC, and carbide total amount 0.2～0.4%kg/t, molten steel divides 3～5 batch diffusive deoxidations, it is ensured that white slag time >=15 Minute；Blowing Ar pressure is 0.30～0.40Mpa, and flow is 50～110L/min, time >=30min.
Preferably, the production technology of a kind of 65Si2CrVA spring steel, described vacuum outgas operation: vacuum 0.8 millibar Hereinafter, application of vacuum 15～30 minutes, after vacuum breaker application of vacuum terminates, soft blow time 10～30 minutes, to promote field trash Floating, tapping temperature controls at 1450～1500 DEG C.
Preferably, the production technology of a kind of 65Si2CrVA spring steel, described continuous casting working procedure: liquidus temperature: 1350 DEG C, the degree of superheat: 25～30 DEG C, slippage rate again: 30%.
Preferably, the production technology of a kind of 65Si2CrVA spring steel, described rolling bar operation: to continuous casting billet by propping up Check, defective continuous casting billet is carried out reconditioning process；Start rolling temperature 1050～1150 DEG C；Roll rear air cooling, steel temperature be cooled to 530～ About 580 DEG C, steel surface is collected without bundling after obvious red heat, and heap is cooled to room temperature.
The invention has the beneficial effects as follows: the spring steel round steel of the present invention is except having general 65Si2CrVA alloying element content Low, decarburizing tendency is little, and temper resistance is good, and hot-working character is good, low cost, the feature such as function admirable after heat treatment, meanwhile, There is under the conditions of rolling rear air cooling good cold-forming property.Ensure that the spring steel round steel of rolling obtains pearlite under the conditions of air cooling Add a small amount of ferritic structure, have during cold working good mould, toughness, after heat treatment, properties all can reach GB/ simultaneously The requirement of T1222, the heat treatment cost simultaneously reduced again.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below in conjunction with the enforcement of the present invention Example, is clearly and completely described the technical scheme in the embodiment of the present invention.Based on the embodiment in the present invention, this area The every other embodiment that those of ordinary skill is obtained under not making creative work premise, broadly falls into present invention protection Scope.
The present invention is a kind of 65Si2CrVA spring steel and production technology, the spring steel round steel of embodiment 1 to embodiment 3 Composition as shown in the table:
Sequence number C Mn Si S P Cr Ni Cu Fe
Embodiment 1 0.56 0.69 1.52 0.002 0.020 0.20 0.05 0.12 Surplus
Embodiment 2 0.53 0.68 1.54 0.025 0.018 0.23 0.06 0.15 Surplus
Embodiment 3 0.60 0.70 1.56 0.015 0.019 0.21 0.07 0.14 Surplus
Embodiment 3 0.52 0.67 1.53 0.008 0.017 0.22 0.06 0.13 Surplus
Embodiment 1:
Electric furnace smelting operation: red packet slag free tapping, makes C >=0.05% after tapping, P≤0.010%, S≤0.020%, determines Oxygen: [O]≤600ppm.
LF refining procedure: using aluminium deoxidation in refining process, use SiC, carbide total amount 0.2～0.4%kg/t, molten steel divides 3～5 batch diffusive deoxidations, it is ensured that white slag time >=15 minute；Blowing Ar pressure is 0.30～0.40Mpa, and flow is 50～110L/ Min, time >=30min.
Vacuum outgas operation: vacuum less than 0.8 millibar, application of vacuum 15～30 minutes, vacuum breaker application of vacuum terminates After, soft blow time 10～30 minutes, to promote inclusion floating, tapping temperature controls at 1450 DEG C.
Continuous casting working procedure: liquidus temperature: 1350 DEG C, the degree of superheat: 25～30 DEG C, slippage rate again: 30%.
Slow cooling operation: steel just put people's burial pit, slow cooling time 24h, go out to cheat temperature and are not more than 150 DEG C.
Rolling bar operation: to continuous casting billet by an inspection, defective continuous casting billet is carried out reconditioning process；Start rolling temperature 1150℃；Rolling rear air cooling, steel temperature is cooled to about 530～580 DEG C, and steel surface is collected without bundling after obvious red heat, and heap is cooled to room temperature.
Heat treatment step: wherein temperature is 600 DEG C, temperature retention time 6～8h, air cooling；Hardening heat 810 DEG C, insulation Time 50min-100min, water-cooled.
Last shaped article completes operation through essence inspection, performance detection, packaging warehouse-in.
Embodiment 2:
Electric furnace smelting operation: red packet slag free tapping, makes C >=0.05% after tapping, P≤0.010%, S≤0.020%, determines Oxygen: [O]≤600ppm.
LF refining procedure: using aluminium deoxidation in refining process, use SiC, carbide total amount 0.2～0.4%kg/t, molten steel divides 3～5 batch diffusive deoxidations, it is ensured that white slag time >=15 minute；Blowing Ar pressure is 0.30～0.40Mpa, and flow is 50～110L/ Min, time >=30min.
Vacuum outgas operation: vacuum less than 0.8 millibar, application of vacuum 15～30 minutes, vacuum breaker application of vacuum terminates After, soft blow time 10～30 minutes, to promote inclusion floating, tapping temperature controls at 1480 DEG C.
Continuous casting working procedure: liquidus temperature: 1350 DEG C, the degree of superheat: 25～30 DEG C, slippage rate again: 30%.
Slow cooling operation: steel just put people's burial pit, slow cooling time 30h, go out to cheat temperature and are not more than 150 DEG C.
Rolling bar operation: to continuous casting billet by an inspection, defective continuous casting billet is carried out reconditioning process；Start rolling temperature 1050℃；Rolling rear air cooling, steel temperature is cooled to about 530～580 DEG C, and steel surface is collected without bundling after obvious red heat, and heap is cooled to room temperature.
Heat treatment step: wherein temperature is 610 DEG C, temperature retention time 6～8h, air cooling；Hardening heat 810 DEG C, insulation Time 50min-100min, water-cooled.
Last shaped article completes operation through essence inspection, performance detection, packaging warehouse-in.
Embodiment 3:
Electric furnace smelting operation: red packet slag free tapping, makes C >=0.05% after tapping, P≤0.010%, S≤0.020%, determines Oxygen: [O]≤600ppm.
LF refining procedure: using aluminium deoxidation in refining process, use SiC, carbide total amount 0.2～0.4%kg/t, molten steel divides 3～5 batch diffusive deoxidations, it is ensured that white slag time >=15 minute；Blowing Ar pressure is 0.30～0.40Mpa, and flow is 50～110L/ Min, time >=30min.
Vacuum outgas operation: vacuum less than 0.8 millibar, application of vacuum 15～30 minutes, vacuum breaker application of vacuum terminates After, soft blow time 10～30 minutes, to promote inclusion floating, tapping temperature controls at 1500 DEG C.
Continuous casting working procedure: liquidus temperature: 1350 DEG C, the degree of superheat: 25～30 DEG C, slippage rate again: 30%.
Slow cooling operation: steel just put people's burial pit, slow cooling time 36h, go out to cheat temperature and are not more than 150 DEG C.
Rolling bar operation: to continuous casting billet by an inspection, defective continuous casting billet is carried out reconditioning process；Start rolling temperature 1100℃；Rolling rear air cooling, steel temperature is cooled to about 530～580 DEG C, and steel surface is collected without bundling after obvious red heat, and heap is cooled to room temperature.
Heat treatment step: wherein temperature is 590 DEG C, temperature retention time 6～8h, air cooling；Hardening heat 830 DEG C, insulation Time 50min-100min, water-cooled.
Last shaped article completes operation through essence inspection, performance detection, packaging warehouse-in.
Embodiment 4:
Electric furnace smelting operation: red packet slag free tapping, makes C >=0.05% after tapping, P≤0.010%, S≤0.020%, determines Oxygen: [O]≤600ppm.
LF refining procedure: using aluminium deoxidation in refining process, use SiC, carbide total amount 0.2～0.4%kg/t, molten steel divides 3～5 batch diffusive deoxidations, it is ensured that white slag time >=15 minute；Blowing Ar pressure is 0.30～0.40Mpa, and flow is 50～110L/ Min, time >=30min.
Vacuum outgas operation: vacuum less than 0.8 millibar, application of vacuum 15～30 minutes, vacuum breaker application of vacuum terminates After, soft blow time 10～30 minutes, to promote inclusion floating, tapping temperature controls at 1460 DEG C.
Continuous casting working procedure: liquidus temperature: 1350 DEG C, the degree of superheat: 25～30 DEG C, slippage rate again: 30%.
Slow cooling operation: steel just put people's burial pit, slow cooling time 25h, go out to cheat temperature and are not more than 150 DEG C.
Rolling bar operation: to continuous casting billet by an inspection, defective continuous casting billet is carried out reconditioning process；Start rolling temperature 1150℃；Rolling rear air cooling, steel temperature is cooled to about 530～580 DEG C, and steel surface is collected without bundling after obvious red heat, and heap is cooled to room temperature.
Heat treatment step: wherein temperature is 600 DEG C, temperature retention time 6～8h, air cooling；Hardening heat 825 DEG C, insulation Time 50min-100min, water-cooled.
Last shaped article completes operation through essence inspection, performance detection, packaging warehouse-in.
Use the 65Si2CrVA spring steel that the production technology of the present invention produces, rolled tensile property
Such as table 1:
Sequence number Tensile strength, Mpa Yield strength, Mpa Elongation percentage, % Hundred shrinkages, %
1 1020 750 12.6 30.0
2 1010 630 13.0 31.5
3 1030 640 12.8 29.5
4 1060 590 13.5 32.0
Heat treatment after-drawing performance such as table 2:
Sequence number Tensile strength, Mpa Yield strength, Mpa Elongation percentage, % Hundred shrinkages, %
1 1520 850 6.6 31.0
2 1510 730 7.0 31.9
3 1490 740 6.8 33.5
4 1610 760 7.5 32.0
Above example only in order to technical scheme to be described, is not intended to limit；Although with reference to previous embodiment The present invention is described in detail, it will be understood by those within the art that: it still can be to aforementioned each enforcement Technical scheme described in example is modified, or wherein portion of techniques feature is carried out equivalent；And these amendment or Replace, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.

Claims (8)

1. a 65Si2CrVA spring steel, it is characterised in that described spring steel includes following composition: C by weight percentage: 0.52～0.60%, Si:1.40～2.00%, Mn:0.70～1.00%, P :≤0.025%, S :≤0.025%, Cr:0.15 ～0.35%, Ni :≤0.10%, Cu :≤0.25%, surplus is Fe and inevitable impurity.
2. 65Si2CrVA spring steel as claimed in claim 1, it is characterised in that described spring steel wraps by weight percentage Include following composition: C:0.53%, Si:1.54%, Mn:0.68%, P:0.018%, S:0.025%, Cr:0.23%, Ni: 0.06%, Cu:0.15%, surplus is Fe and inevitable impurity.
3. the production technology of a 65Si2CrVA spring steel, it is characterised in that include following operation: electric furnace smelting-LF refine- Vacuum outgas-continuous casting-slow cooling-rolling bar-heat treatment-essence inspection-performance detection-packaging warehouse-in.
4. the production technology of 65Si2CrVA spring steel as claimed in claim 3, it is characterised in that described electric furnace smelting work Sequence: red packet slag free tapping, makes C >=0.05% after tapping, P≤0.010%, S≤0.020%, determines oxygen: [O]≤600ppm.
5. the production technology of 65Si2CrVA spring steel as claimed in claim 3, it is characterised in that described LF refining procedure: Using aluminium deoxidation in refining process, use SiC, carbide total amount 0.2～0.4%kg/t, molten steel divides 3～5 batch diffusive deoxidations, really Protect white slag time >=15 minute；Blowing Ar pressure is 0.30～0.40Mpa, and flow is 50～110L/min, time >=30min.
6. the production technology of 65Si2CrVA spring steel as claimed in claim 3, it is characterised in that described vacuum outgas work Sequence: vacuum less than 0.8 millibar, application of vacuum 15～30 minutes, after vacuum breaker application of vacuum terminates, soft blow time 10～30 points Clock, to promote inclusion floating, tapping temperature controls at 1450～1500 DEG C.
7. the production technology of 65Si2CrVA spring steel as claimed in claim 3, it is characterised in that in described continuous casting process: liquid Liquidus temperature: 1350 DEG C, the degree of superheat: 25～30 DEG C, slippage rate again: 30%.
8. the production technology of 65Si2CrVA spring steel as claimed in claim 3, it is characterised in that described rolling bar work Sequence: to continuous casting billet by an inspection, defective continuous casting billet is carried out reconditioning process；Start rolling temperature 1050～1150 DEG C；Sky after rolling Cold, steel temperature is cooled to about 530～580 DEG C, and steel surface is collected without bundling after obvious red heat, and heap is cooled to room temperature.
CN201610530420.XA 2016-07-06 2016-07-06 A kind of 65Si2CrVA spring steel and production technology thereof Pending CN106191648A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106756506A (en) * 2016-12-30 2017-05-31 天津大强钢铁有限公司 It is agricultural to scratch ground rotary blade alloy spring Steel material
CN108425075A (en) * 2018-04-10 2018-08-21 西王金属科技有限公司 A kind of automobile suspension system spring steel and its manufacturing method
CN111961981A (en) * 2020-07-29 2020-11-20 南京钢铁股份有限公司 60Si2Mn spring steel for railway fastener and preparation method thereof

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Publication number Priority date Publication date Assignee Title
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Publication number Priority date Publication date Assignee Title
CN101717893A (en) * 2009-12-15 2010-06-02 南京钢铁股份有限公司 55Si2MnVNbN spring steel and production process thereof
CN103540729A (en) * 2013-09-30 2014-01-29 湖南华菱湘潭钢铁有限公司 Production method of wear-resistant steel with high toughness

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106756506A (en) * 2016-12-30 2017-05-31 天津大强钢铁有限公司 It is agricultural to scratch ground rotary blade alloy spring Steel material
CN108425075A (en) * 2018-04-10 2018-08-21 西王金属科技有限公司 A kind of automobile suspension system spring steel and its manufacturing method
CN111961981A (en) * 2020-07-29 2020-11-20 南京钢铁股份有限公司 60Si2Mn spring steel for railway fastener and preparation method thereof

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