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Process for realizing sorbitizing cold rolling of high-strength and high-fatigue spring narrow band steel

A high-strength and fatigue-resistant technology, applied in the field of metallurgy, can solve the problems of inability to achieve strength and durability, and achieve the effect of excellent cold workability, high strength, and performance improvement.

Inactive Publication Date: 2017-02-15
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing technology can not reach the required strength and endurance times (fatigue times)

Method used

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  • Process for realizing sorbitizing cold rolling of high-strength and high-fatigue spring narrow band steel
  • Process for realizing sorbitizing cold rolling of high-strength and high-fatigue spring narrow band steel

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Embodiment Construction

[0019] A sorbite cold-rolling process for realizing high-strength and high-fatigue spring narrow-strip steel, specifically as follows:

[0020] Raw material selection: choose high carbon steel SK5, thickness 2.5mm, do not use alloy spring steel.

[0021] Process design: The process route is as follows:

[0022] Decoiling and peeling—pickling—levelling—coiling—first stage cold rolling—austempering—second stage cold rolling—slitting—packaging.

[0023] Process parameter setting: the thickness of the temper mill outlet is set to 2.3mm, the thickness of the first stage cold rolling is 1.9mm, the isothermal quenching adopts a lead bath, the temperature of the lead bath is 790°C, the temperature of the lead bath is 420°C, and the belt running speed is 2.0m / min, water cooling after leaving the lead bath, it is required that the structure of the lead bath is sorbite. The second stage of cold rolling is divided into three rolling passes to reach a finished product thickness of 0.25mm...

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Abstract

The invention discloses a process for realizing sorbitizing cold rolling of high-strength and high-fatigue spring narrow band steel. High-carbon steel SK5 with the thickness of 2.5mm is selected; the process comprises the process routes of unreeling and shelling, pickling, temper rolling, reeling, first-stage cold rolling, isothermal quenching, second-stage cold rolling, striping and packaging; process parameters are set as follows: the outlet thickness of a temper rolling mill is set to be 2.3mm; the first-stage cold rolling thickness is 1.9mm; lead bath is adopted in isothermal quenching, the lead bath entering temperature is 790 DEG C, the lead bath temperature is 420 DEG C, the band steel running speed is 2.0m / min, water cooling is carried out after a structure is taken out of the lead bath, and the structure taken out of the lead bath is required to be a sorbite; and a finished product with the thickness of 0.25mm is rolled by three rolling processes in the second-stage cold rolling. A safety belt collecting coil spring produced by using the process disclosed by the invention is subjected to durability test for 90000 times or above, so that the requirement for materials of medium-high-end cars is met.

Description

technical field [0001] The invention belongs to the field of metallurgy, and relates to a cold-rolling process, in particular to a sorbite cold-rolling process for realizing high-strength and high-fatigue spring narrow-strip steel. Background technique [0002] The car seat belt tightening coil springs are all made of Si-Mn series alloy spring steel in China. Due to the limitation of processing methods, the strength is maintained at 1700MPa, and the fatigue is maintained within 70,000 times. It can be compared with low-end springs. However, the materials used in mid-to-high-end cars require a strength of 2100MPa and a fatigue of more than 90,000 times. The existing technology can't reach the required strength and endurance times (fatigue times). Contents of the invention [0003] The purpose of the present invention is to provide a sorbite cold-rolling process for realizing high-strength and high-fatigue spring narrow strip steel. The safety belt collecting coil spring pr...

Claims

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Application Information

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IPC IPC(8): C21D1/20C21D8/02C21D9/52
CPCC21D1/20C21D8/0236C21D8/0247C21D9/52
Inventor 李军
Owner NANJING IRON & STEEL CO LTD
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