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Production method of high-tenacity 65Mn spring steel with uniform whole wire rod property

A production method and high-toughness technology, applied in the field of spring steel, which can solve the problems of fluctuation in tensile strength and poor uniformity of strips

Active Publication Date: 2015-04-29
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a production method of high-toughness 65Mn spring steel with uniform performance of the cleaning rod, which solves the problems of poor uniformity of the cleaning rod and very large fluctuations in the tensile strength of the same ring.

Method used

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  • Production method of high-tenacity 65Mn spring steel with uniform whole wire rod property
  • Production method of high-tenacity 65Mn spring steel with uniform whole wire rod property
  • Production method of high-tenacity 65Mn spring steel with uniform whole wire rod property

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The billets produced by converter smelting and LF furnace refining and continuous casting are then rolled into hot-rolled wire rods through steps such as heating in a heating furnace, rolling, and controlled cooling. In the rolling process, the rolling start temperature is 1025°C, and the four passes of rough rolling adopt tension-free rolling with head off, and the temperature at the entrance of the rolling mill after head off is 900°C. After the pre-finish rolling and before the finish rolling, the water tank is alternately cooled by water cooling-recovery-water cooling-recovery, and the cooling rate is 50°C / s; the surface of the billet before the finish rolling is bright without obvious black spots. The temperature at the entrance of finish rolling is 845°C. After finish rolling and before silk spinning, five stages of water cooling-recovery control are adopted, and the cooling rate is 100°C / s. In the cooling process, the silk spinning temperature is 830°C. During th...

Embodiment 2

[0031] The billets produced by converter smelting and LF furnace refining and continuous casting are then rolled into hot-rolled wire rods through steps such as heating in a heating furnace, rolling, and controlled cooling. In the rolling process, the rolling start temperature is 1005°C, and the four passes of rough rolling are head-off tension-free rolling, and the temperature at the entrance of the rolling mill after head-off is 890°C. After the pre-finish rolling and before the finish rolling, the water tank is alternately cooled by water cooling-recovery-water cooling-recovery, and the cooling rate is 41°C / s; the surface of the billet before the finish rolling is bright without obvious black spots. The temperature at the entrance of finish rolling is 840°C. After finish rolling and before spinning, five stages of water cooling-recovery control are adopted, and the cooling rate is 145°C / s. In the cooling process, the silk spinning temperature is 830°C. During the cooling pr...

Embodiment 3

[0033] The billets produced by converter smelting and LF furnace refining and continuous casting are then rolled into hot-rolled wire rods through steps such as heating in a heating furnace, rolling, and controlled cooling. In the rolling process, the rolling start temperature is 1020°C, and the four passes of rough rolling adopt tension-free rolling with head off, and the temperature at the entrance of the rolling mill after head off is 880°C. After the pre-finish rolling and before the finish rolling, the water tank is alternately cooled by water cooling-recovery-water cooling-recovery, and the cooling rate is 30°C / s; the surface of the billet before the finish rolling is bright without obvious black spots. The entrance temperature of finish rolling is 830°C. After finish rolling and before silk spinning, five-stage water cooling-recovery control is adopted, and the cooling rate is 100°C / s. In the cooling process, the silk spinning temperature is 850°C. During the cooling pr...

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Abstract

The invention discloses a production method of high-tenacity 65Mn spring steel with a uniform whole wire rod property, and belongs to the technical field of spring steel. The specific parameters are as follows: the rolling starting temperature is 1000 to 1030 DEG C during rolling, and the temperature of the inlet of a roller is 880 to 900 DEG C after starting; the temperature of a finish rolling inlet is 830 to 850 DEG C; five-section alternative water cooling is adopted after finish rolling, the finish rolling temperature is 830 to 850 DEG C; during Stelmor air cooling line cooling in cooling control, a fan is started to perform rapid cooling after finish rolling, a heat preservation cover for slow cooling begins to cover a position 3m behind the fan, the enter- cover temperature is 620 to 630 DEG C in a lap point position, and the coming-out cover temperature is 480 to 500 DEG C. The method has the advantages that the uniformity of the whole wire rod property of the 65Mn spring steel is realized, the ductility and toughness of the whole wire rod are improved, the drawing yield is improved, and the fatigue property of the spring steel is enhanced.

Description

technical field [0001] The invention belongs to the technical field of spring steel, in particular to a production method of high-toughness 65Mn spring steel with uniform cleaning rod performance. It is suitable for improving the area shrinkage of spring steel wire rod, reducing the performance fluctuation of the same coil of wire rod, and improving the fatigue performance of spring steel. Background technique [0002] As a very important shock absorption and functional component, spring is widely used in automobile manufacturing and daily life. According to different uses, spring steel is required to have different levels of ductility and fatigue properties. Therefore, different kinds of spring steel were born. The existing spring grades mainly include 65Mn and 60Si 2 MnA, 55SiCr, etc. belong to Cr-V series, Cr-Mn series, Si-Mn series, etc. respectively. They have the advantages of good hardenability, high strength, and excellent fatigue performance, and are widely used ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C21D8/06
Inventor 晁月林邓素怀张玮孙齐松郑福印佟倩柳洋波王猛
Owner SHOUGANG CORPORATION
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