CN102747210A - Stelmor cooling control method for 55SiCrA spring steel wire rod - Google Patents
Stelmor cooling control method for 55SiCrA spring steel wire rod Download PDFInfo
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- CN102747210A CN102747210A CN2012102739729A CN201210273972A CN102747210A CN 102747210 A CN102747210 A CN 102747210A CN 2012102739729 A CN2012102739729 A CN 2012102739729A CN 201210273972 A CN201210273972 A CN 201210273972A CN 102747210 A CN102747210 A CN 102747210A
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- stelmor
- wire rod
- 55sicra
- spring steel
- cooling
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- 238000001816 cooling Methods 0.000 title claims abstract description 37
- 229910000639 Spring steel Inorganic materials 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title abstract description 12
- 238000004321 preservation Methods 0.000 abstract 2
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 abstract 1
- 238000009987 spinning Methods 0.000 abstract 1
- 230000002159 abnormal effect Effects 0.000 description 7
- 229910000734 martensite Inorganic materials 0.000 description 6
- 230000009466 transformation Effects 0.000 description 6
- 229910008458 Si—Cr Inorganic materials 0.000 description 5
- 229910001563 bainite Inorganic materials 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 239000000725 suspension Substances 0.000 description 4
- 230000002950 deficient Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000010583 slow cooling Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 238000009529 body temperature measurement Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000005496 tempering Methods 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 229910019582 Cr V Inorganic materials 0.000 description 1
- 229910006639 Si—Mn Inorganic materials 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000002929 anti-fatigue Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 235000019362 perlite Nutrition 0.000 description 1
- 239000010451 perlite Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
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Abstract
The invention provides a stelmor cooling control method of a 55SiCrA spring steel wire rod, which comprises the following steps: the spinning temperature is 850 +/-10 ℃; setting the air quantity of the first fan to be 10-100%, and turning off the rest of the first fan; the speed of the stelmor inlet section roller way is 0.3-0.5 m/s; the heat preservation covers on the initial section of 0-30 m of stelmor are all opened, one heat preservation cover is opened every 30 m on the section of 30-100 m, and the rest are closed; rapidly cooling to 630-710 ℃ at a cooling speed of 4-9K/s in an initial section of 0-25 m stelmor, and slowly cooling at a cooling speed of 0-2K/s in a section of 25-100 m stelmor, wherein the temperature of a bundling position is 550-630 ℃. The wire rod manufactured by the method has high sorbite rate, stable strength and good plasticity.
Description
Technical field
The present invention relates to a kind of method of cooling of spring steel wire rod, particularly a kind of stelmor controlled cooling method of 55SiCrA spring steel wire rod belongs to the Steel Rolling field.
Background technology
The development of following automobile is towards low fuel consumption, economizes in raw materials, and the direction of protection environment, and, have good security and weather resistance.This should develop towards the direction of miniaturized, lightweight, high strength with component with regard to requiring automobile.High-strength vehicle has broad prospects with spring steel, estimates that national demand to the automobile suspension spring in 2012 is 200,000 tons.Traditional Cr-V system, Cr-Mn system, Si-Mn based material will be substituted by the Si-Cr based material of HS, high-yield-ratio gradually.Si-Cr is a spring steel owing to have good anti-fatigue performance and corrosion resistance nature etc., is commonly used to make automobile and uses heavily stressed pendulum spring.Si-Cr is that spring steel has become domestic main automobile with one of spring steel kind at present.55SiCrA is a most popular steel grade in the Si-Cr system.
Fatigue property and resistance for delayed fracture etc. are that Si-Cr is the subject matter that the automobile suspension spring faces after high strength.Along with the raising of suspension spring with intensity of steel wire, the susceptibility of defectives such as Steel Wire Surface defective and abnormal structure is increased, abnormal structures such as the slight defective in surface and inclusion, and organize inhomogeneous etc. be easy to cause repeated stress failure or delayed fracture.Automobile is had higher requirement to surface quality, inclusion and the structure property control etc. of gren rod with the high strength of suspension spring.For gren rod, can improve the wire rod surface quality through methods such as blank whole peeling, finishing reconditioning, optimization design of pass; Measure through adopting vacuum metling, prolonging raising purity such as soft churning time can reduce inclusion size and quantity; And, then need adopt suitable cooling controlling and rolling controlling process for tissue and Properties Control.
The tissue of 55SiCrA spring steel wire rod and mechanical property will produce material impact to follow-up drawing, oil quenching-tempering, moulding process and use properties etc., and be therefore, most important to the control of wire rod microstructure and property in the production process.Because the alloying element content in the 55SiCrA spring steel is higher, hardening capacity is more intense, needs to adopt the appropriate control process for cooling in the production.Cooled off when strong, be prone to abnormal structures such as bainite or martensite in the wire rod tissue, caused in follow-up wire rod drawing process, taking place brittle rupture; Cool off when more weak, cause crystal grain thick easily, form a large amount of proeutectoid ferrites, reduce sorbitic rate, influence the homogeneity of structure and the fatigue property of oil quenching-tempering spring.
Therefore; Be necessary to develop a kind of stelmor controlled cooling method of 55SiCrA spring steel wire rod; Avoid occurring in the wire rod tissue abnormal structures such as bainite or martensite; Avoid the thick a large amount of formation with eutectoid ferrite of crystal grain simultaneously, guarantee the performance of 55SiCrA spring steel wire rod in subsequent production technology.
Summary of the invention
The object of the present invention is to provide a kind of stelmor controlled cooling method of 55SiCrA spring steel wire rod; Adopt in the 55SiCrA spring steel wire rod tissue of this method manufacturing and abnormal structures such as bainite or martensite can not occur; Sorbitic rate is than higher, intensity stabilization, and plasticity is good.
The present invention realizes through following technical scheme:
A kind of stelmor controlled cooling method of 55SiCrA spring steel wire rod is characterized in that: 850 ± 10 ℃ of laying temperatures; The first typhoon fan delivery is made as 10～100%, and all the other are closed; Stelmor entrance roller table speed is 0.3～0.5m/s; Stay-warm case on 0～30 meter initial segment of stelmor is all opened, and whenever opens a stay-warm case at a distance from 30 meters on 30～100 meters sections, and all the other are closed; On the initial segment of 0～25 meter of stelmor, be quickly cooled to 630～710 ℃ with the speed of cooling of 4～9K/s, on 25～100 meters sections of stelmor, slowly to cool off with the speed of cooling of 0～2K/s, collection volume place temperature is 550～630 ℃.
Because the tap density of wire rod is different with center position at the edge of stelmo line, there are temperature head in the central position of stelmo line, the intensive position in sparse position and edge.Therefore; Among the present invention, on the initial segment of 0～25 meter of stelmor, when temperature is quickly cooled to 630～710 with the speed of cooling of 4～9K/s; The temperature of stelmor edge, the intensive position of wire rod is no more than 710 ℃, and the temperature of stelmor heart portion, the sparse position of wire rod is not less than 630 ℃.Can guarantee that like this wire rod all gets into the pearlitic transformation interval, minimum temperature is not less than 630 ℃ and can avoids the part abnormal structures such as bainite or martensite to occur, and top temperature is no more than 710 ℃ of weave constructions that help obtaining high sorbitic rate.
The hardening capacity of 55SiCrA spring steel is stronger, and the too fast meeting of cooling rate causes the generation of abnormal structure, controls the mode that should adopt slow cooling in the cold process.Consider difference because of the wire rod diameter; The tap density of wire rod and cooling performance also can be variant on the stelmo line, therefore, only drive the first typhoon machine among the present invention; All the other Close Alls: for the 55SiCrA wire rod of diameter >=12mm, the first typhoon fan delivery is 50～100%; For the 55SiCrA wire rod of diameter＜12mm, the first typhoon fan delivery is 10～50%.
For the unlatching of stay-warm case, on 0～30 meter initial segment, all open, to realize before the phase transformation cold soon with the phase transformation initial stage, improve sorbitic rate; Whenever on 30～100 meters sections, open a stay-warm case at a distance from 30 meters, all the other are closed, and the slow cooling with the realization phase transformation later stage makes austenite fully change perlite into, avoids occurring martensite.
The present invention adopts slow roller table speed; Except realizing the slow cooling; Can also prolong wire rod line duration and transformation time, pearlitic transformation is fully carried out, avoid wire rod after going out stelmo line, under the air cooling condition, to occur changing the martensite that forms by residual austenite.Consider the difference of wire rod specification, for the 55SiCrA wire rod of diameter at >=12mm, stelmor entrance roller table speed is 0.3～0.4m/s; For the 55SiCrA wire rod of diameter＜12mm, stelmor entrance roller table speed is 0.4～0.5m/s.
It is cold that the present invention adopts aforesaid method to carry out the stelmor control, successfully produces the good 55SiCrA spring steel wire rod of structure property, and sorbitic rate is more than 90%, and tensile strength is 1000～1100MPa, and reduction of area can reach more than 49%.
Description of drawings
Fig. 1 is the cooling chart of stelmor on-line measurement in the embodiment of the invention 1;
Fig. 2 is the cooling chart of stelmor on-line measurement in the embodiment of the invention 2.
Embodiment
Embodiment 1
A kind of stelmor controlled cooling method of 13mm55SiCrA spring steel wire rod, laying temperature are 849 ℃; Roller table speed and fan delivery are as shown in table 1, and the entrance roller table speed is 0.4m/s, and the first typhoon fan delivery is 75%, and all the other are closed; Stay-warm case on 0～30 meter initial segment is all opened, and whenever opens a stay-warm case at a distance from 30 meters on 30～100 meters sections, and all the other are closed.The actual measurement cooling curve is as shown in Figure 1, and temperature measurement location is stelmor edge, wire rod dense part.Can know by Fig. 1, (among Fig. 1 on 0～50s), be quickly cooled to 706 ℃ with the speed of cooling of 6K/s at the initial segment of 0～25 meter of stelmor; On 25～100 meters sections of stelmor, slowly to cool off with the speed of cooling of 0～2K/s, collection volume place temperature is 604 ℃.
According to the 13mm55SiCrA wire rod product that above-mentioned explained hereafter is come out, sorbitic rate is 93%, and tensile strength MV is 1019MPa, and reduction of area MV is 49.8%.
Table 113mm55SiCrA wire rod stelmor cooling control technology
Embodiment 2
A kind of stelmor controlled cooling method of 10mm55SiCrA spring steel wire rod, laying temperature are 843 ℃; Roller table speed and fan delivery are as shown in table 2, and the entrance roller table speed is 0.4m/s, and the first typhoon fan delivery is 30%, and all the other are closed; Stay-warm case on 0～30 meter initial segment of stelmor is all opened, and whenever opens a stay-warm case at a distance from 30 meters on 30～100 meters sections, and all the other are closed.The actual measurement cooling curve is as shown in Figure 2, and temperature measurement location is stelmor edge, wire rod dense part.Can know that by Fig. 2 (among Fig. 2 on 0～50s), be quickly cooled to 705 ℃ with the speed of cooling of 4.8K/s, on 25～100 meters sections of stelmor, slowly cool off with the speed of cooling of 0～2K/s, collection volume place temperature is 604 ℃ at the initial segment of 0～25 meter of stelmor.
According to the 10mm55SiCrA wire rod product that above-mentioned explained hereafter is come out, sorbitic rate is 96%, and tensile strength MV is 1060MPa, and reduction of area MV is 54%.
Table 210mm55SiCrA wire rod stelmor cooling control technology
Claims (3)
1. the stelmor controlled cooling method of a 55SiCrA spring steel wire rod is characterized in that: 850 ± 10 ℃ of laying temperatures; The first typhoon fan delivery is made as 10～100%, and all the other are closed; Stelmor entrance roller table speed is 0.3～0.5m/s; Stay-warm case on 0～30 meter initial segment of stelmor is all opened, and whenever opens a stay-warm case at a distance from 30 meters on 30～100 meters sections, and all the other are closed; On the initial segment of 0～25 meter of stelmor, be quickly cooled to 630～710 ℃ with the speed of cooling of 4～9K/s, on 25～100 meters sections of stelmor, slowly to cool off with the speed of cooling of 0～2K/s, collection volume place temperature is 550～630 ℃.
2. the stelmor controlled cooling method of 55SiCrA spring steel wire rod according to claim 1 is characterized in that: for the 55SiCrA wire rod of diameter >=12mm, the first typhoon fan delivery is 50～100%; For the 55SiCrA wire rod of diameter＜12mm, the first typhoon fan delivery is 10～50%.
3. the stelmor controlled cooling method of 55SiCrA spring steel wire rod according to claim 1 is characterized in that: for the 55SiCrA wire rod of diameter >=12mm, stelmor entrance roller table speed is 0.3～0.4m/s; For the 55SiCrA wire rod of diameter＜12mm, stelmor entrance roller table speed is 0.4～0.5m/s.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210273972.9A CN102747210B (en) | 2012-08-03 | 2012-08-03 | Stelmor cooling control method for 55SiCrA spring steel wire rod |
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| CN201210273972.9A CN102747210B (en) | 2012-08-03 | 2012-08-03 | Stelmor cooling control method for 55SiCrA spring steel wire rod |
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| CN102747210A true CN102747210A (en) | 2012-10-24 |
| CN102747210B CN102747210B (en) | 2014-07-02 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103240271A (en) * | 2013-04-18 | 2013-08-14 | 首钢总公司 | Production method for reducing dynamic drawing aging of low-carbon steel wire rods |
| CN106734261A (en) * | 2016-12-12 | 2017-05-31 | 中天钢铁集团有限公司 | A kind of cold technique of Stanermo wind-cooling linear control for improving spring steel 55SiCrA wire rods tissue and performance |
| CN111872137A (en) * | 2020-07-07 | 2020-11-03 | 鞍钢股份有限公司 | Controlled cooling method for spring steel wire rod after rolling |
| CN112126760A (en) * | 2020-09-25 | 2020-12-25 | 攀钢集团研究院有限公司 | Preparation method of aging-free 82B hot-rolled wire rod |
| CN112239803A (en) * | 2020-10-15 | 2021-01-19 | 中天钢铁集团有限公司 | Controlled rolling and controlled cooling method for reducing martensite in high alloy steel hot-rolled wire rod microstructure |
| CN118006887A (en) * | 2024-04-09 | 2024-05-10 | 江苏永钢集团有限公司 | 1000MPa grade high-plasticity 55SiCrA spring steel wire rod production process |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101649416A (en) * | 2009-09-04 | 2010-02-17 | 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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2012
- 2012-08-03 CN CN201210273972.9A patent/CN102747210B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101649416A (en) * | 2009-09-04 | 2010-02-17 | 江苏省沙钢钢铁研究院有限公司 | High-carbon steel wire rod and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 刘虎等: "弹簧钢55SiCrA过冷奥氏体动态连续冷却转变", 《材料热处理学报》, vol. 32, no. 7, 31 July 2011 (2011-07-31) * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103240271A (en) * | 2013-04-18 | 2013-08-14 | 首钢总公司 | Production method for reducing dynamic drawing aging of low-carbon steel wire rods |
| CN103240271B (en) * | 2013-04-18 | 2014-12-24 | 首钢总公司 | Production method for reducing dynamic drawing aging of low-carbon steel wire rods |
| CN106734261A (en) * | 2016-12-12 | 2017-05-31 | 中天钢铁集团有限公司 | A kind of cold technique of Stanermo wind-cooling linear control for improving spring steel 55SiCrA wire rods tissue and performance |
| CN111872137A (en) * | 2020-07-07 | 2020-11-03 | 鞍钢股份有限公司 | Controlled cooling method for spring steel wire rod after rolling |
| CN112126760A (en) * | 2020-09-25 | 2020-12-25 | 攀钢集团研究院有限公司 | Preparation method of aging-free 82B hot-rolled wire rod |
| CN112126760B (en) * | 2020-09-25 | 2022-05-24 | 攀钢集团研究院有限公司 | Preparation method of aging-free 82B hot-rolled wire rod |
| CN112239803A (en) * | 2020-10-15 | 2021-01-19 | 中天钢铁集团有限公司 | Controlled rolling and controlled cooling method for reducing martensite in high alloy steel hot-rolled wire rod microstructure |
| CN118006887A (en) * | 2024-04-09 | 2024-05-10 | 江苏永钢集团有限公司 | 1000MPa grade high-plasticity 55SiCrA spring steel wire rod production process |
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| CN102747210B (en) | 2014-07-02 |
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