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A kind of production method of alloy spring steel wire rod with excellent drawing performance

A spring steel and wire rod technology, applied in the direction of manufacturing tools, metal rolling, 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 phase change Effects of deformed nuclei, shortened phase transformation incubation period, and increased substructure density

Active Publication Date: 2022-06-28
ZENITH STEEL GROUP CORP CO LTD +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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  • A kind of production method of alloy spring steel wire rod with excellent drawing performance
  • A kind of production method of alloy spring steel wire rod with excellent drawing performance
  • A kind of production method of alloy spring steel wire rod with excellent drawing performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1 (Φ6.5mm)

[0027] 1. Billet 220*260 heating billet

[0028] The composition of the steel 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, and the rest are Fe.

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

[0030] 2. 160*160 heating of the intermediate blank

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

[0032] 3. Rolling

[0033] The rolling temperature of the billet is 923-935°C, the ...

Embodiment 2

[0038] Example 2 (Φ9.0mm)

[0039] 1. Billet 220*260 heating billet

[0040] The composition of the steel 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, and the rest are Fe. The total heating time of the billet in the heating furnace is 435 minutes, the high temperature diffusion time of the second stage and the soaking section of the casting billet is 232 minutes, and the temperature of the second heating section and the soaking section is 1223-1246 ℃.

[0041] 2. 160*160 heating of the intermediate blank

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

[0043] 3. Rolling

[0044] The rolling temperature of the billet is 939-954°C, the rolling st...

Embodiment 3

[0049] Example 3 (Φ12mm)

[0050] 1. Billet 220*260 heating billet

[0051]The composition of the steel 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, and the rest are Fe. The total heating time of the billet in the heating furnace is 435 minutes, the high temperature diffusion time of the second stage of the casting billet heating and the soaking section is 232 minutes, and the temperature of the high temperature section is 1223-1246 ℃.

[0052] 2. 160*160 heating of the intermediate blank

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

[0054] 3. Rolling

[0055] The rolling temperature of the billet is 919-944°C, the rolling stock is cooled b...

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Abstract

The invention belongs to the technical field of rolling, and in particular relates to a production method of an alloy spring steel wire rod with excellent drawing performance, including billet opening, heating, rolling, and cooling processes, and the temperature of the second heating stage and the soaking stage of the casting billet is 1200- 1250°C, after holding time for 3-6 hours, the billet is opened, the intermediate billet is heated for 100-300 minutes, the temperature of the second heating section and the soaking section is 900-1050°C, and the second heating section and the soaking section do not exceed 100 minutes; The rolling mill temperature is 750-850°C, the deformation is 60-90%; the spinning temperature is 750-800°C, the Stelmo controlled cooling time is 600-1200 seconds, the cooling rate is 0.10-0.20°C / s, and it is air-cooled after being out of the hood. Obtain 100% ferrite F+pearlite P structure, grain size above grade 9, excellent plastic deformation performance, can be directly used for large deformation cold drawing without annealing, and has the characteristics of energy saving, consumption reduction, environmental protection and so on.

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 billeting, 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 automobile clutch diaphragms, automobile 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 it is easy to generate internal cracks or internal cracks when the user directly draws it. Fracture is a common pro...

Claims

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Application Information

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Patent Type & Authority Patents(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 CO LTD
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