Production method of alloy spring steel wire with excellent drawing performance

A production method and spring steel technology, applied in metal rolling, manufacturing tools, metal rolling, etc., can solve the problems of increasing spheroidizing or softening annealing process, energy consumption, long cycle, etc., to increase the driving force of phase change and Effects of phase transformation nuclei, shortening phase transformation incubation period, and increasing substructure density

Active Publication Date: 2021-05-28
ZENITH STEEL GROUP CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The user needs to increase the spheroidizing or softening annealing process, and annealing will increase the production cost, the cycle is long, and cause energy consumption and environmental pollution. Therefore, there is an urgent need for a production method to obtain CrV alloy spring steel wire with excellent drawing performance without M+ B microstructure, to achieve the user's direct drawing processing

Method used

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  • Production method of alloy spring steel wire with excellent drawing performance
  • Production method of alloy spring steel wire with excellent drawing performance
  • Production method of alloy spring steel wire with excellent drawing performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1 (Φ6.5mm)

[0027] 1. Steel billet 220*260 is heated and opened

[0028] The composition of the billet is calculated by mass percentage (wt%). The composition is C: 0.50, Si: 0.25, Mn: 0.75, P: 0.012, S: 0.008, Cr: 1.05, Ni: 0.02, Cu: 0.02, Al: 0.020, V: 0.15, the rest is Fe.

[0029] The total heating time of the steel slab in the heating furnace is 362 minutes, the high-temperature diffusion time of the second heating stage and the soaking section of the billet is 198 minutes, and the temperature of the second heating stage and the soaking section is 1212-1235°C.

[0030] 2. Intermediate billet 160*160 heating

[0031] The temperature of the second heating stage and the soaking section of the intermediate billet is 1012-1050°C, the total heating time is 163 minutes, the second heating stage and the soaking section are 81 minutes, and the air-fuel ratio is 0.43-0.50.

[0032] 3. Rolling

[0033] The billet starts rolling at a temperature of 923-935°C. The ...

Embodiment 2

[0038] Example 2 (Φ9.0mm)

[0039] 1. Steel billet 220*260 is heated and opened

[0040] The composition of the billet is calculated by mass percentage (wt%). The composition is C: 0.50, Si: 0.25, Mn: 0.75, P: 0.012, S: 0.008, Cr: 1.05, Ni: 0.02, Cu: 0.02, Al: 0.020, V: 0.15, the rest is Fe. The total heating time of the steel slab in the heating furnace is 435 minutes, the high temperature diffusion time of the second heating section and the soaking section of the cast slab is 232 minutes, and the temperature of the second heating section and the soaking section is 1223-1246°C.

[0041] 2. Intermediate billet 160*160 heating

[0042] The temperature of the second heating stage and the soaking section of the intermediate billet is 1023-1049°C, the total heating time is 190 minutes, the second heating stage and the soaking section are 95 minutes, and the air-fuel ratio is 0.46-0.50.

[0043] 3. Rolling

[0044] The billet start rolling temperature is 939-954°C, the rolled p...

Embodiment 3

[0049] Example 3 (Φ12mm)

[0050] 1. Steel billet 220*260 is heated and opened

[0051]The composition of the billet is calculated by mass percentage (wt%). The composition is C: 0.51, Si: 0.25, Mn: 0.73, P: 0.010, S: 0.005, Cr: 1.02, Ni: 0.02, Cu: 0.02, Al: 0.025, V: 0.13, the rest is Fe. The total heating time of the steel slab in the heating furnace is 435 minutes, the high-temperature diffusion time of the second section of the casting slab heating and the soaking section is 232 minutes, and the temperature of the high-temperature section is 1223-1246°C.

[0052] 2. Intermediate billet 160*160 heating

[0053] The temperature of the second heating stage and the soaking section of the intermediate blank is 1013-1039°C, the total heating time is 174 minutes, the second heating stage and the soaking section are 82 minutes, and the air-fuel ratio is 0.46-0.50.

[0054] 3. Rolling

[0055] The billet start rolling temperature is 919-944°C, the rolled piece is cooled by wate...

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Abstract

The invention belongs to the technical field of rolling, and particularly relates to a production method of an alloy spring steel wire with excellent drawing performance, which comprises the working procedures of cogging, heating, rolling and cooling, the temperature of a second heating section and a soaking section of a casting blank is 1200-1250 DEG C, cogging is carried out after the heat preservation time is 3-6 hours, an intermediate blank is heated for 100-300 minutes, the temperature of the second heating section and the soaking section is 900-1050 DEG C, and the second heating section and the soaking section do not exceed 100 minutes; the temperature in/out of a finishing mill is 750-850 DEG C, and the deformation is 60-90%; and the spinning temperature is 750-800 DEG C, the Stelmor controlled cooling time is 600-1200 seconds, the cooling rate is 0.10-0.20 DEG C/s, and air cooling is carried out in a manner of avoiding wind after discharging from a cover. A 100% ferrite F + pearlite P structure is obtained, the grain size is more than 9 grade, the plastic deformation performance is excellent, and the method can be directly used for large-deformation cold drawing processing without annealing, and has the characteristics of energy conservation, consumption reduction, greenness, environmental protection and the like.

Description

technical field [0001] The invention belongs to the technical field of rolling, and relates to a production method of an alloy spring steel wire rod, in particular to a blanking, heating, rolling and cooling process of an alloy spring steel wire rod 50CrVA / 51CrV4 with excellent drawing performance. Background technique [0002] Alloy spring steel 50CrVA / 51CrV4 has good mechanical properties and hardenability, and is often used in the manufacture of automotive clutch diaphragms, automotive coil suspension springs, etc. [0003] With the rapid development of China's automobile industry and high-speed trains, the demand for high-quality CrV spring steel is on the rise. Due to the strong hardenability of 50CrVA / 51CrV4 spring steel, the small size Φ5.5~12mm wire rod is prone to martensite M+bainite B structure during the cooling process after normal rolling, and internal cracks or Fracture is a common problem in the industry at present. The user needs to increase the spheroidiz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/16B21B27/10C22C38/02C22C38/04C22C38/06C22C38/20C22C38/24C22C38/42C22C38/46C21D8/06
CPCB21B1/16B21B27/10C22C38/02C22C38/04C22C38/06C22C38/20C22C38/24C22C38/42C22C38/46C21D8/065C21D2211/005C21D2211/009
Inventor 左锦中李翔韩健杨科大林俊万文华赵阳林晓峰张盛华
Owner ZENITH STEEL GROUP CORP
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