CN104561731B - A kind of production method of poker characteristic uniform high tenacity 65Mn spring steel - Google Patents
A kind of production method of poker characteristic uniform high tenacity 65Mn spring steel Download PDFInfo
- Publication number
- CN104561731B CN104561731B CN201410832209.4A CN201410832209A CN104561731B CN 104561731 B CN104561731 B CN 104561731B CN 201410832209 A CN201410832209 A CN 201410832209A CN 104561731 B CN104561731 B CN 104561731B
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- Prior art keywords
- cooling
- temperature
- rolling
- spring steel
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- 229910000639 Spring steel Inorganic materials 0.000 title claims abstract description 37
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 241001081830 Degeneriaceae Species 0.000 claims abstract description 77
- 238000005096 rolling process Methods 0.000 claims abstract description 58
- 238000001816 cooling Methods 0.000 claims abstract description 53
- 238000000034 methods Methods 0.000 claims abstract description 18
- 238000009941 weaving Methods 0.000 claims abstract description 13
- 238000010583 slow cooling Methods 0.000 claims abstract description 12
- 238000009413 insulation Methods 0.000 claims abstract description 10
- 239000011901 water Substances 0.000 claims description 20
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000003723 Smelting Methods 0.000 claims description 5
- 238000005266 casting Methods 0.000 claims description 2
- 239000003643 water by type Substances 0.000 abstract 1
- 229910000529 magnetic ferrites Inorganic materials 0.000 description 8
- 229910000859 α-Fe Inorganic materials 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 210000001519 tissues Anatomy 0.000 description 7
- 229910001562 pearlite Inorganic materials 0.000 description 6
- 206010017076 Fracture Diseases 0.000 description 4
- 238000010622 cold drawing Methods 0.000 description 4
- 238000005516 engineering processes Methods 0.000 description 4
- 230000002159 abnormal effects Effects 0.000 description 3
- 238000009749 continuous casting Methods 0.000 description 3
- 230000001131 transforming Effects 0.000 description 3
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 OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 239000011229 interlayers Substances 0.000 description 2
- 239000010410 layers Substances 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching Effects 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
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- 229910019582 Cr V Inorganic materials 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 229910006639 Si—Mn Inorganic materials 0.000 description 1
- 208000001285 Stress Fractures Diseases 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 238000006243 chemical reactions Methods 0.000 description 1
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- 230000000694 effects Effects 0.000 description 1
- 281999990011 institutions and organizations companies 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 239000000463 materials Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000003921 oils Substances 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000126 substances Substances 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
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- 238000004804 winding Methods 0.000 description 1
Abstract
Description
Technical field
The invention belongs to spring steel technical field, particularly to a kind of poker characteristic uniform high tenacity 65Mn spring steel Production method.It is applicable to improve the reduction of area of spring steel wire rod, reduces the same circle performance inconsistency of wire rod, improve the fatigue of spring steel Performance.
Background technology
Spring, as very important damping and functional part, is widely used in auto manufacturing and daily life In.According to different purposes, it is desirable to spring steel has plasticity and toughness and the fatigue behaviour of different stage.Therefore, different types of bullet Spring steel arises.The existing spring trade mark mainly has 65Mn, 60Si2MnA, 55SiCr etc., be belonging respectively to Cr-V system, Cr-Mn system, Si-Mn system etc., has the advantages such as quenching degree is good, intensity is high, fatigue behaviour is excellent, is widely used in truck spring and produces In.
65Mn is a kind of application spring steel widely, is mainly used in common spring steel wire, automotive suspension spring, oil quenching Fire-tempering spring steel wire, high ferro spring shim etc., is one of the most topmost spring steel, is also partly One of spring steel of district's large usage quantity.Its purposes gradually by for conventional suspension spring to precision spring change, drawing amount also by Gradually pulling out product to deep-draw to change, such as oil-tempered steel wire, it needs wire rod to have the uniform resultant force of excellent poker characteristic Learn performance and fatigue crack-resistant performance.
65Mn spring steel wire rod typically needs to carry out cold drawing, surface acid-washing, heat treatment, volume in the follow-up course of processing The techniques such as spring, the surface quality of wire rod, the cleanliness factor of steel, center segregation, the poker uniformity etc. of structure property are had by they Strict requirements, otherwise easily cause fatigue fracture, and resisting fatigue sensitivity weakens, and affects the service life of spring, and severe patient is easy In causing the serious problems such as wire rod cold drawing fracture, deep drawing fracture, wind spring brittle failure, thus affect the lumber recovery of steel, reduce The security performance of material.
The poker uniformity that existing technique produces 65Mn wire rod is poor, and the tensile strength fluctuation with circle is very big, with circle Plasticity reduction of area is the most uneven, and the reduction of area that especially rolls off the production line is relatively low, and user, after buying finished product, need to place January in warehouse for finished product More than could use, fracture otherwise occurs in cold drawing, wind spring and spring shim winding process.Accordingly, it would be desirable to research one Plant new technology, improve the structure property poker uniformity of steel, improve the plasticity and toughness energy of steel, reduce the fracture of wire during cold drawing Rate.
Application No. CN201210398901.1, filing date 2012.10.19 day, entitled " a kind of 65Mn spring steel disk The production technology of bar and 65Mn spring wire rod " Chinese patent literature disclose the production process route of a kind of 65Mn wire rod.Should Process route mainly adjusts heating furnace system to the production process of 65Mn wire rod, and the decarburized layer deepness solving 65Mn wire rod changes Kind problem, and use the conventional operation of rolling to obtain suitable tissue and high-strength mechanical properties, but it is for wire rod Poker uniformity is the most not mentioned, and from the point of view of embodiment, its tensile strength is bigger with reduction of area fluctuation.And wide along with 65Mn purposes General use, poker uniformity is the leading indicator of 65Mn spring steel.
Publication No. CN103484781A, filing date 2014.1.1 day, entitled " a kind of high-strength and high-ductility spring steel and Its manufacture method " Chinese patent literature disclose a kind of high-toughness spring steel, it changes steel by adjusting alloying component Tensile strength and toughness and tenacity, but relatively costly, it is only applicable to the spring steel of specific use.And spring steel is produced by this patent The uniform performance of poker and for mentioning, and from the point of view of embodiment, its tensile strength is bigger with reduction of area fluctuation.
Whole process controlled rolling and controlled cooling of the present invention, by controlling furnace temp and time, it is achieved the austenitizing to strand, it is ensured that While steel billet temperature difference ＜ end to end 30 DEG C, prevent abnormal grain growth, thinning microstructure.Roll in Cu, in de-head technique link Rolling temperature control, had both ensured the high temperature deformation seam to defects such as internal rarefaction shrinkage cavities, simultaneously between recrystallization zone under Limit temperature rolling, it is ensured that the refinement of deformed austeaite crystal grain.Continue after pre-finish rolling to use to control cold measure, it is achieved Low Temperature Finish, Big degree store deformation energy for roller repairing, it is ensured that structure refinement.Roll rear water-cooled and low temperature weaves silk control finish rolling temperature rise at 80- 100 DEG C, so go out finishing mill temperature ＜ 1000 DEG C, escape the temperature range that tissue abnormalities is grown up, then coordinate suitably cool down into One step shortens the time of staying in interval of growing up at tissue, reduces tendency of growing up, it is achieved roll maximum structure refinement, simultaneously Weaken and roll rear water-cooled to the surface stress of wire rod.After rolling, air-cooled technique uses coexistence region quickly to cool down+roll rear Slow cooling Measure, it is ensured that austenite phase transformation is phase transformation in the case of 100-120 DEG C of degree of supercooling, coordinates deformation to store energy induced transformation effect, Ensure sheet interlayer spacing and the grain size of final sorbite group of phase-change organization.Rolling rear slow cooling is for realizing 65Mn segregation The Xin Bu abnormal structure caused and stress reduce, and control its cooldown rate in thermal insulation cover, it is ensured that wire rod fills more than 500 DEG C The slow cooling time divided.
Summary of the invention
It is an object of the invention to provide the production method of a kind of poker characteristic uniform high tenacity 65Mn spring steel, solve Poker uniformity is poor, with problems such as the tensile strength fluctuation of circle are the biggest.Especially provide one can reduce 65Mn spring Steel is same encloses performance inconsistency, the crystallite dimension of reduction, raising structure property uniformity, to such an extent as to improves the drawing property of finished product wire rod And the fatigue behaviour of finished product spring.
The production method of a kind of poker characteristic uniform high tenacity 65Mn spring steel, by converter smelting, LF stove refine, company Casting, heating furnace are heated, roll, are controlled the steps such as cooling and be rolled into gren rod.Concrete steps and parameter are as follows:
1, rolling: start rolling temperature is 1000 DEG C-1030 DEG C, roughing four-pass uses de-head tension free rolling, rolls after de-head Machine inlet temperature is 880 DEG C-900 DEG C；Water tank-reply section-water tank-reply section two sections is used to replace water after pre-finish rolling, before finish rolling Cold but entry temperature at finishing is 830 DEG C-850 DEG C, enters billet surface light before finish rolling, without obvious black speck.Use after finish rolling Water tank-reply section-water tank-reply section five sections replaces the method for cooling by water, and laying temperature is 830 DEG C-850 DEG C, to reach low Temperature is weaved silk, prevents the purpose of abnormal grain growth.
2, cooling is controlled: in steyr mill air-cooled line cooling procedure, open blower fan rapid cooling after weaving silk, start at 3m after blower fan Adding a cover thermal insulation cover slow cooling, overlapped points position enters cover temperature and is 620-630 DEG C, goes out cover temperature 480-500 DEG C；Employing leading portion is fast Cold, the method for back segment slow cooling, to reach to reduce the generation of pro-eutectoid ferrite, in refinement pearlite interlaminar spacing, reduction wire rod The purpose of stress.
In step 1 after pre-finish rolling, before finish rolling, alternately the rate of cooling of cooling by water is 30-50 DEG C/s；To weaving silk after finish rolling Front cooling by water speed is 100 DEG C/s-200 DEG C/s.
In step 2, the rate of cooling of rapid cooling is 15 DEG C/s-18 DEG C/s；The rate of cooling of slow cooling is 2-3 DEG C/s.
" with circle " mentioned herein refers to any one circle in a dish wire rod, and it is reaction poker characteristic fluctuation One important indicator, is also a Main Means of inspection poker characteristic.Poker characteristic herein is by inspection multi-turn Can draw.
It is an advantage of the current invention that:
1) rely on existing product line equipment, on the premise of not changing existing equipment, use before finish rolling with finish rolling after water-cooled Case-reply section-water cooling box-reply section be alternately cooled the implementation result reaching zerolling cleverly；
2) weaved silk by zerolling, low temperature and control the air-cooled technology of stelmor to reach to refine original austenite crystalline substance Grain, the same purpose enclosing performance inconsistency of reduction, thus realize the uniformity of the poker characteristic of 65Mn spring steel, increase moulding of wire rod tough Property, improve drawing lumber recovery, promote the purpose of the fatigue behaviour of spring steel.
Accompanying drawing explanation
Fig. 1 is 65Mn spring steel transverse section 500X displaing micro tissue topography.
Fig. 2 is the pearlite interlaminar spacing pattern of 65Mn spring steel transverse section 10000X.
Fig. 3 is the innermost microstructure of one side total decarburized layer of 65Mn spring steel transverse section 200X.
Fig. 4 is the grain size pattern of 65Mn spring steel transverse section 500X.
Detailed description of the invention
Embodiment 1:
The square billet utilizing converter smelting, LF stove refine continuous casting to go out is heated by heating furnace, roll, is controlled the steps such as cooling again It is rolled into gren rod.Rolling process, start rolling temperature is 1025 DEG C, roughing four-pass uses de-head tension free rolling, after de-head Inlet of rolling mill temperature is 900 DEG C.After pre-finish rolling, before finish rolling, water tank uses water-cooled-reply-water-cooled-reply to be alternately cooled, cooling speed Degree is 50 DEG C/s；Enter billet surface light before finish rolling, without obvious black speck.Entry temperature at finishing is 845 DEG C, to before weaving silk after finish rolling Using water-cooled-reply five sections control, rate of cooling is 100 DEG C/s.Cooling procedure operation, laying temperature is 830 DEG C, stelmor In air-cooled line cooling procedure, open blower fan after weaving silk, reduce the generation of pro-eutectoid ferrite, start at 3m after blower fan to add a cover insulation Cover slow cooling, it is 625 DEG C that overlapped points position enters cover temperature, goes out cover temperature 480 DEG C.To before entering thermal insulation cover after weaving silk, the cooling of wire rod Speed is 15 DEG C/s；Entering the rate of cooling after cover is 3 DEG C/s so that after cooling, in wire rod tissue, ferrite content reduces, refinement Pearlite interlaminar spacing, the purpose of reduction wire rod internal stress.
Testing result is as follows: rolled off the production line the same day and 10 days 65Mn spring steel φ 9mm of timeliness are shown in reduction of area with circle tensile strength Shown in table 1 and table 2.Metallographic structure is sorbite+fine pearlite+very small amount ferrite, as shown in Figure 1；Sheet interlayer spacing is shown in Shown in Fig. 2；The most total decarburized depth is less than 1%, as shown in Figure 3；Grain size is 9.5 grades, as shown in Figure 4.
Table 1 rolled off the production line 65Mn spring steel φ 9mm with enclosing mechanical property the same day
The 10th day 65Mn spring steel φ 9mm of table 2 timeliness is with enclosing mechanical property
Embodiment 2:
The square billet utilizing converter smelting, LF stove refine continuous casting to go out is heated by heating furnace, roll, is controlled the steps such as cooling again It is rolled into gren rod.Rolling process, start rolling temperature is 1005 DEG C, roughing four-pass uses de-head tension free rolling, after de-head Inlet of rolling mill temperature is 890 DEG C.After pre-finish rolling, before finish rolling, water tank uses water-cooled-reply-water-cooled-reply to be alternately cooled, cooling speed Degree is 41 DEG C/s；Enter billet surface light before finish rolling, without obvious black speck.Entry temperature at finishing is 840 DEG C, to before weaving silk after finish rolling Using water-cooled-reply five sections control, rate of cooling is 145 DEG C/s.Cooling procedure operation, laying temperature is 830 DEG C, stelmor In air-cooled line cooling procedure, open blower fan after weaving silk, reduce the generation of pro-eutectoid ferrite, start at 3m after blower fan to add a cover insulation Cover slow cooling, it is 620 DEG C that overlapped points position enters cover temperature, goes out cover temperature 490 DEG C.To before entering thermal insulation cover after weaving silk, the cooling of wire rod Speed is 18 DEG C/s；Entering the rate of cooling after cover is 2.5 DEG C/s so that after cooling, in wire rod tissue, ferrite content reduces, carefully Change pearlite interlaminar spacing, the purpose of reduction wire rod internal stress.
Embodiment 3:
The square billet utilizing converter smelting, LF stove refine continuous casting to go out is heated by heating furnace, roll, is controlled the steps such as cooling again It is rolled into gren rod.Rolling process, start rolling temperature is 1020 DEG C, roughing four-pass uses de-head tension free rolling, after de-head Inlet of rolling mill temperature is 880 DEG C.After pre-finish rolling, before finish rolling, water tank uses water-cooled-reply-water-cooled-reply to be alternately cooled, cooling speed Degree is 30 DEG C/s；Enter billet surface light before finish rolling, without obvious black speck.Entry temperature at finishing is 830 DEG C, to before weaving silk after finish rolling Using water-cooled-reply five sections control, rate of cooling is 100 DEG C/s.Cooling procedure operation, laying temperature is 850 DEG C, stelmor In air-cooled line cooling procedure, open blower fan after weaving silk, reduce the generation of pro-eutectoid ferrite, start at 3m after blower fan to add a cover insulation Cover slow cooling, it is 630 DEG C that overlapped points position enters cover temperature, goes out cover temperature 495 DEG C.To before entering thermal insulation cover after weaving silk, the cooling of wire rod Speed is 15 DEG C/s；Entering the rate of cooling after cover is 3 DEG C/s so that after cooling, in wire rod tissue, ferrite content reduces, refinement Pearlite interlaminar spacing, the purpose of reduction wire rod internal stress.
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| CN106399654B (en) * | 2016-09-09 | 2018-08-07 | 武汉钢铁有限公司 | A method of improving spring steel pattern segregation |
| CN106702276A (en) * | 2016-12-23 | 2017-05-24 | 首钢总公司 | Manufacturing method for 65Mn steel plate |
| CN109092891B (en) * | 2018-07-12 | 2020-01-03 | 石横特钢集团有限公司 | Production method of 400Mpa grade superfine crystal grain steel ribbed steel bar wire rod |
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| CN101649416B (en) * | 2009-09-04 | 2011-05-25 | 江苏省沙钢钢铁研究院有限公司 | High carbon steel wire rod and preparation method thereof |
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| CN102912101B (en) * | 2012-10-19 | 2014-03-19 | 攀钢集团成都钢钒有限公司 | Production process of 65 Mn spring steel wire rod and 65 Mn spring steel wire rod |
| CN103484781B (en) * | 2013-09-26 | 2016-06-01 | 宝山钢铁股份有限公司 | A kind of high-strength and high-ductility spring steel and manufacture method thereof |
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Address after: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee before: Capital Iron & Steel General Company |
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