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 PDF

Info

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
Authority
CN
China
Prior art keywords
cooling
temperature
rolling
spring steel
cover
Prior art date
Application number
CN201410832209.4A
Other languages
Chinese (zh)
Other versions
CN104561731A (en
Inventor
晁月林
邓素怀
张玮
孙齐松
郑福印
佟倩
柳洋波
王猛
Original Assignee
首钢总公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 首钢总公司 filed Critical 首钢总公司
Priority to CN201410832209.4A priority Critical patent/CN104561731B/en
Publication of CN104561731A publication Critical patent/CN104561731A/en
Application granted granted Critical
Publication of CN104561731B publication Critical patent/CN104561731B/en

Links

Abstract

The production method of a kind of poker characteristic uniform high tenacity 65Mn spring steel, belongs to spring steel technical field.Design parameter is: during rolling, start rolling temperature is 1000 DEG C-1030 DEG C, and after de-head, inlet of rolling mill temperature is 880 DEG C-900 DEG C;Entry temperature at finishing is 830 DEG C-850 DEG C;Using five sections of alternately cooling by waters after finish rolling, laying temperature is 830 DEG C-850 DEG C;Controlling during cooling in steyr mill air-cooled line cooling procedure, after weaving silk, unlatching blower fan rapid cooling, starts to add a cover thermal insulation cover slow cooling at 3m after blower fan, and overlapped points position enters cover temperature and is 620-630 DEG C, goes out cover temperature 480-500 DEG C.Advantage is, it is achieved that the uniformity of the poker characteristic of 65Mn spring steel, increases the plasticity and toughness of wire rod, improves drawing lumber recovery, promotes the fatigue behaviour of spring steel.

Description

A kind of production method of poker characteristic uniform high tenacity 65Mn spring steel

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.

Claims (1)

1. a production method for poker characteristic uniform high tenacity 65Mn spring steel, including converter smelting, LF stove refine, company Casting, heating furnace are heated, roll, are controlled cooling step and be rolled into gren rod, it is characterised in that concrete steps and parameter are as follows:
1) rolling: start rolling temperature is 1000 DEG C-1030 DEG C, roughing four-pass de-head tension free rolling, inlet of rolling mill after de-head Temperature is 880 DEG C-900 DEG C;Cooling by water is replaced by water tank-reply section-water tank-reply section two sections after pre-finish rolling, before finish rolling, Entry temperature at finishing is 830 DEG C-850 DEG C;Water tank-reply section-water tank-reply section five sections is used to replace cooling by water after finish rolling, Laying temperature is 830 DEG C-850 DEG C;
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 to add 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;
Step 1) described in pre-finish rolling after, before finish rolling, alternately the rate of cooling of cooling by water is 30-50 DEG C/s;To telling after finish rolling Before silk, cooling by water speed is 100 DEG C/s-200 DEG C/s;
Step 2) described in the rate of cooling of rapid cooling be 15 DEG C/s-18 DEG C/s;The rate of cooling of slow cooling is 2-3 DEG C/s.
CN201410832209.4A 2014-12-28 2014-12-28 A kind of production method of poker characteristic uniform high tenacity 65Mn spring steel CN104561731B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410832209.4A CN104561731B (en) 2014-12-28 2014-12-28 A kind of production method of poker characteristic uniform high tenacity 65Mn spring steel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410832209.4A CN104561731B (en) 2014-12-28 2014-12-28 A kind of production method of poker characteristic uniform high tenacity 65Mn spring steel

Publications (2)

Publication Number Publication Date
CN104561731A CN104561731A (en) 2015-04-29
CN104561731B true CN104561731B (en) 2017-01-04

Family

ID=53078797

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201410832209.4A CN104561731B (en) 2014-12-28 2014-12-28 A kind of production method of poker characteristic uniform high tenacity 65Mn spring steel

Country Status (1)

Country Link
CN (1) CN104561731B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105779725B (en) * 2015-12-25 2018-03-23 江苏省沙钢钢铁研究院有限公司 A kind of wire rod milling method for eliminating surface of low-carbon steel fine grain
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

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1194194A (en) * 1997-03-26 1998-09-30 陈志财 Flat steel wire for producing piston ring and its production and use
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
CN102352469B (en) * 2011-11-03 2013-05-08 江苏省沙钢钢铁研究院有限公司 Ultrahigh-strength vanadium-titanium composite microalloyed high carbon steel wire rod and preparation method thereof
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

Also Published As

Publication number Publication date
CN104561731A (en) 2015-04-29

Similar Documents

Publication Publication Date Title
CN102876983B (en) Production process for 82B wire rod used for high strength prestressed steel wire and wire rod thereof
JP5893769B2 (en) Method for producing 550 MPa class high strength weathering steel strip by strip casting method
JP4500688B2 (en) Steel product manufacturing method
CN106319368B (en) A kind of economical thin carrier bar and its manufacture method
CN103060678B (en) A kind of warm-working nanometer austenite strengthens plasticising steel and preparation method thereof
CN102943169B (en) Quenching and annealing preparation method of ultrahigh-strength thin steel plate for automobiles
CN103805838B (en) High formability super strength cold-roll steel sheet and manufacture method thereof
CN103436680B (en) The production method of a kind of tensile strength >=990MPa tie steel
CN100558504C (en) The low temperature resistant oil derrick power transmission tower frame preparation method of seamless heterotype steel pipe
CN103060703B (en) A kind of cold rolling diphasic strip steel of 780MPa level and manufacture method thereof
CN103088199B (en) Heat treatment method after forging for forged steel bearing roller used for large heavy plate mill
CN103849746B (en) The 40CrNiMoA plug that a kind of thermal treatment process of 40CrNiMoA plug and process thereof obtain
CN103361567B (en) A kind of pressurized-water reactor nuclear power plant potentiostat steel and manufacture method thereof
CN103194580B (en) Rolling method of low-banded structure gear steel
CN105239017B (en) Carburization bearing steel and preparing method thereof
CN106086640B (en) A kind of cold rolling medium managese steel and preparation method thereof of superhigh intensity plasticity product
CN101698902B (en) Quenching method for integral cast steel supporting roll
CN101985722B (en) Pipeline steel plate with low yield ratio, fine grains and high strength and production method thereof
CN103725988B (en) Continuously cast bloom produces high-grade think gauge pipe fitting hot rolled slab and manufacture method thereof
JP6104163B2 (en) High carbon hot-rolled steel sheet, cold-rolled steel sheet and method for producing the same
KR101657822B1 (en) Hot dip galvanized and galvannealed steel sheet having excellent elongation property, and method for the same
CN102912101A (en) Production process of 65 Mn spring steel wire rod and 65 Mn spring steel wire rod
CN102851622A (en) Superhigh-strength high-toughness steel plate for ocean engineering and production method thereof
CN106086353B (en) The milling method that big cross section GCr15 bearing steels net carbide is controlled to be precipitated
TW200540283A (en) High carbon hot-rolled steel sheet and method for manufacturing the same

Legal Events

Date Code Title Description
PB01 Publication
C06 Publication
SE01 Entry into force of request for substantive examination
C10 Entry into substantive examination
GR01 Patent grant
C14 Grant of patent or utility model
CP01 Change in the name or title of a patent holder

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

CP01 Change in the name or title of a patent holder