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Stelmor controlled cooling method for 55SiCrA spring steel wire rod

A spring steel and wire rod technology, which is applied in the field of steel rolling, can solve the problems of brittle fracture, coarse grain, affecting the structure uniformity and fatigue performance of oil quenching-tempering springs, etc.

Active Publication Date: 2012-10-24
INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the cooling is too strong, abnormal structures such as bainite or martensite tend to appear in the wire rod structure, resulting in brittle fracture in the subsequent drawing process of the wire rod; when the cooling is weak, it is easy to cause coarse grains and form a large number of Proeutectoid ferrite reduces the sorbitization rate and affects the microstructure uniformity and fatigue properties of oil quenched-tempered springs

Method used

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  • Stelmor controlled cooling method for 55SiCrA spring steel wire rod
  • Stelmor controlled cooling method for 55SiCrA spring steel wire rod
  • Stelmor controlled cooling method for 55SiCrA spring steel wire rod

Examples

Experimental program
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Effect test

Embodiment 1

[0017] A Steyrmore controlled cooling method for 13mm55SiCrA spring steel wire rod, the spinning temperature is 849℃; the roller table speed and fan air volume are shown in Table 1, the roller table speed at the entrance section is 0.4m / s, the first fan The air volume is 75%, and the rest are closed; the heat preservation covers on the initial section of 0-30 meters are all opened, and the heat preservation covers are opened every 30 meters on the section of 30-100 meters, and the rest are closed. The measured cooling curve is as figure 1 As shown, the temperature measurement location is the edge of Steyrmo and the dense part of the wire rod. by figure 1 It can be seen that in the initial section of 0-25 meters in Steyrmo ( figure 1 In 0~50s), quickly cool to 706℃ at a cooling rate of 6K / s; on the 25~100m section of Steyrmo, cool slowly at a cooling rate of 0~2K / s, the temperature of the coil is 604 ℃.

[0018] The 13mm55SiCrA wire rod product produced according to the above pro...

Embodiment 2

[0022] A Steyrmore controlled cooling method of 10mm55SiCrA spring steel wire rod, the spinning temperature is 843℃; the roller table speed and fan air volume are shown in Table 2, the roller table speed at the entrance section is 0.4m / s, the first fan The air volume is 30%, and the rest are closed; all the insulation covers on the initial section of 0-30 meters in Steyrmo are opened, and the insulation covers are opened every 30 meters on the section of 30-100 meters, and the rest are closed. The measured cooling curve is as figure 2 As shown, the temperature measurement location is the edge of Steyrmo and the dense part of the wire rod. by figure 2 It can be seen that in the initial section of 0-25 meters in Steyrmo ( figure 2 In 0~50s), quickly cool to 705℃ at a cooling rate of 4.8K / s, and slowly cool at a cooling rate of 0~2K / s on the 25~100m section of Steyrmo. The temperature of the coil is 604°C.

[0023] The 10mm55SiCrA wire rod product produced according to the ab...

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Abstract

The invention provides a Stelmor controlled cooling method for a 55SiCrA spring steel wire rod. The processes of the controlled cooling method comprise that the spinning temperature is 850+ / -10 DEG C; the air output of a first fan is set to be 10-100%, and the rest of fans are closed; the Stelmor inlet section roller way speed is 0.3-0.5m / s; heat insulation covers on a 0-30m Stelmor initial section are all opened, one heat insulation cover is opened every 30m on a 30-100m section, and the rest of heat insulation covers are closed; on a 0-25m Stelmor initial section, the wire rod is cooled rapidly to 630-710 DEG C at the cooling speed of 4-9K / s, and on a 25-100m Stelmor section, the wire rod is cooled slowly at the cooling speed of 0-2K / s, and the temperature at the coiling position is 550-630 DEG C. The wire rod produced by the method is high in sorbite rate, stable in strength and good in plasticity.

Description

Technical field [0001] The invention relates to a cooling method for spring steel wire rods, in particular to a Steyrmo controlled cooling method for 55SiCrA spring steel wire rods, belonging to the field of steel rolling. Background technique [0002] The future development of automobiles is towards low fuel consumption, saving raw materials, protecting the environment, and has good safety and durability. This requires the development of auto parts in the direction of miniaturization, light weight, and high strength. High-strength automotive spring steel has broad prospects. It is estimated that the national demand for automotive suspension springs in 2012 will be 200,000 tons. The traditional Cr-V series, Cr-Mn series, and Si-Mn series materials will gradually be replaced by Si-Cr series materials with high strength and high yield ratio. Due to its good fatigue resistance and corrosion resistance, Si-Cr series spring steels are often used to make high-stress suspension spring...

Claims

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Application Information

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IPC IPC(8): C21D8/06C21D11/00
Inventor 黄文克麻晗
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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