Rolling method of high-strength car spring steel wire rod

A technology for automobile springs and steel wire rods, which is applied in the field of hot rolling of steel wire rods, and can solve the problems that full decarburization cannot be eliminated.

Active Publication Date: 2020-08-14
XINGTAI IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The spring steel production methods disclosed in the above patents all control the rapid cooling of the wire rod to the phase transition temperature in the controlled cooling process to avoid the precipitation of pro-eutectoid ferrite, thereby avoiding the complete decarburization of the wire rod surface, but this process can only Control the full decarburization of the wire rod after spinning. The full decarburization in the rolling process cannot be eliminated and can only be left to the finished wire rod

Method used

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  • Rolling method of high-strength car spring steel wire rod
  • Rolling method of high-strength car spring steel wire rod
  • Rolling method of high-strength car spring steel wire rod

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1 of the present invention provides a rolling method of high-strength automotive spring steel wire rod. The chemical composition and weight percentage of the steel are listed in Table 1. The wire rod specification is Ф12mm, and the heating temperature of the billet in the heating furnace is 1000°C. The total heating time is 97min, the residual oxygen content of the heating furnace is 1.1%, the temperature of entering and finishing rolling is 930°C, and the spinning temperature is 880°C. After spinning, adjust the opening and closing of the insulation cover and the opening of the fan to rapidly cool the wire rod to 780°C. Cooling rate C1 The average cooling rate C2 of the wire rod from 780°C to 600°C is 1.0°C / s.

Embodiment 2－9 and comparative example 1－3

[0023] Examples 2-9 and Comparative Examples 1-3 use the same process as Example 1 to roll spring steel wire rods. The chemical composition and weight percentage of the steel are listed in Table 1. The difference is that Table 2 is used respectively. Listed in the billet in the heating furnace heating temperature, total heating time, residual oxygen in the heating furnace, into the finish rolling temperature, spinning temperature, cooling rate C1, average cooling rate C2, wire rod specification instead of the embodiment 1 Heating temperature, total heating time, residual oxygen in heating furnace, finishing temperature, spinning temperature, cooling rate C1, average cooling rate C2, wire rod specifications.

[0024] Table 1

[0025]

[0026] Table 2

[0027]

[0028] Utilize optical microscope to check the full decarburization situation on the surface of the wire rods produced in Examples 1-9 and Comparative Examples 1-3, and the test results are listed in Table 3, with...

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Abstract

The invention relates to the field of steel wire rod hot rolling, in particular to a rolling method of a high-strength car spring steel wire rod. The rolling method comprises the procedures of steel blank heating, controlled rolling and controlled cooling. In the heating procedure, the heating temperature of a steel blank in a heating furnace is 1000 to 1080 DEG C, the total heating time is 70 to150 min, the remaining oxygen of the heating furnace is smaller than or equal to 3.0%, in the controlled rolling procedure, the wire rod finish rolling temperature is 850 to 980 DEG C, the spinning temperature is 850 to 950 DEG C, in the controlled cooling procedure, the wire rod after spinning is rapidly cooled to 780 DEG C, the cooling speed C1 is controlled to 5.0 to 10.0 DEG C/s, when the wirerod is from 780 DEG C to 600 DEG C, the average cooling speed C2 is controlled to 0.5 to 4.0 DEG C/s, the obtained wire rod is of a ferrite + pearlite + sorbite structure, and the surface is free offull decarburization.

Description

technical field [0001] The invention belongs to the field of hot rolling of steel wire rods, and relates to a rolling method of high-strength automotive spring steel wire rods. Background technique [0002] Spring steel hot-rolled wire rods are mainly used to manufacture automobile suspension springs, clutch springs, valve springs and die springs, mainly including 55SiCr, 55SiCrV, 60Si2Mn and other grades. High-strength spring steel has high requirements for surface decarburization. During the service process of suspension springs and valve springs, decarburization, especially full decarburization, has a great impact on fatigue life. At present, for the decarburization of spring steel, the total decarburization of wire rods is mainly reduced by controlling the heating temperature, heating time and furnace atmosphere in the billet heating process, but the total decarburization of spring steel wire rods cannot be effectively eliminated. [0003] The Chinese patent application...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/22C22C38/02C22C38/04C22C38/18C21D1/84C21D8/02C21D9/00
CPCB21B1/22C22C38/02C22C38/04C22C38/18C21D1/84C21D8/0226C21D9/0081B21B2001/225B21B2201/02
Inventor 秦树超黄翠香胡黎宁田新中董庆赵昊乾段路昭孟耀青杨栋范振霞杨强强
Owner XINGTAI IRON & STEEL
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