After-rolling controlled cooling method for spring steel wire rod

A technology of steel wire rod and spring steel, which is applied in metal rolling, temperature control, metal rolling, etc., can solve the problems of poor performance of the same coil, etc. The effect of carbon layer depth improvement

Active Publication Date: 2020-11-03
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides an on-line water bath controlled cooling method for spring steel wire rods after rolling. The spring steel wire rods after spinning are controlled and cooled in the form of online EDC water bath + compressed air flow at the bottom of the water tank. The produced spring steel wire rods The decarburization layer depth of the wire rod is significantly improved compared with the conventional Stelmo controlled cooling process, the poor performance of the same coil is reduced, and the uniformity of the structure is better, which is a good solution to the depth of the decarburization layer of the wire rod and the uniform structure and performance of the wire rod sexual problems

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  • After-rolling controlled cooling method for spring steel wire rod
  • After-rolling controlled cooling method for spring steel wire rod

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Embodiment 1

[0035] In this embodiment, the spring steel grade is 55SiCr, and the diameter specification is After the wire rod is rolled, the cooling is controlled according to the following parameters: wire rod spinning temperature: 860°C; wire rod temperature when entering the EDC water tank: 820°C; water bath temperature: 95°C; wire rod outlet water temperature: 560°C; water tank The pressure of compressed air flowing into the bottom: 0.5MPa.

[0036] The tensile strength of the steel spring steel wire rod produced in this embodiment is 1000~1150MPa, the reduction of area ≥ 40%, the poor performance of the same coil is below 60MPa, the structure is uniform and there is no low temperature structure such as martensite and bainite, and the wire rod is detached. The carbon layer is less than 60 microns and uniformly controlled, which satisfies the user's technical requirements for spring steel wire rods.

Embodiment 2

[0038] In this embodiment, the spring steel grade is 55SiCr, and the diameter specification is After the wire rod is rolled, the cooling is controlled according to the following parameters: wire rod spinning temperature: 850°C; wire rod temperature when entering the EDC water tank: 810°C; water bath temperature: 96°C; wire rod outlet water temperature: 570°C; water tank The pressure of compressed air flowing into the bottom: 0.8MPa.

[0039] The tensile strength of the spring steel wire rod produced in this embodiment is 1000-1150 MPa, the reduction of area is ≥ 40%, the performance difference of the same ring is less than 60 MPa, the structure is uniform and there is no low-temperature structure such as martensite and bainite, and the wire rod is decarburized The layer is less than 60 microns and uniformly controlled, which satisfies the user's technical requirements for spring steel wire rods.

Embodiment 3

[0041] In this embodiment, the spring steel grade is 55SiCr, and the diameter specification is After the wire rod is rolled, the cooling is controlled according to the following parameters: wire rod spinning temperature: 840°C; wire rod temperature when entering the EDC water tank: 820°C; water bath temperature: 100°C; wire rod outlet water temperature: 580°C; water tank The pressure of compressed air flowing into the bottom: 1.0MPa.

[0042] The tensile strength of the spring steel wire rod produced in this embodiment is 1050-1150 MPa, the reduction of area is ≥ 40%, the performance difference of the same coil is less than 60 MPa, the structure is uniform and there is no low-temperature structure such as martensite and bainite, and the wire rod is decarburized The layer is less than 70 microns and uniformly controlled, which satisfies the technical requirements of users for spring steel wire rods.

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Abstract

The invention relates to an after-rolling controlled cooling method for a spring steel wire rod. A manner of EDC water bath cooling and introducing of a compressed air flow into the bottom of an EDC water tank is adopted for controlled cooling of the spring steel wire rod, and control parameters are as follows: 1) the spinning temperature of the wire rod is 830-880 DEG C; 2) the temperature when the wire rod enters the EDC water tank is 800-850 DEG C; 3) the water bath temperature of the wire rod in the EDC water tank is 95 DEG C or above; 4) the water outlet temperature of the wire rod is 540-600 DEG C; and 5) the pressure of the compressed air flow introduced into the bottom of the EDC water tank is 0.5-1.0 MPa. Compared with the depth of a decarburized layer of a spring steel wire rod produced by a conventional Stelmor controlled cooling process, the depth of a decarburized layer of the spring steel wire rod produced through the method is obviously improved, the same-circle performance difference is reduced, the structure uniformity is better, and the problems about the depth of the decarburized layer of the wire rod and the uniformity of structure performance of the wire rod are well solved.

Description

technical field [0001] The invention relates to the technical field of wire rod production, in particular to a post-rolling controlled cooling method for spring steel wire rods. Background technique [0002] 55SiCr spring steel is Si-Cr spring steel, which is often used to make automobile suspension springs and is the most widely used steel in Si-Cr spring steel. When 55SiCr spring steel is used, it is required to have good anti-fatigue performance, anti-shock performance and comprehensive mechanical properties, etc. Therefore, more stringent requirements are put forward for the physical quality of this steel during production. Among them, the depth of decarburization layer of wire rod and the uniformity of structure and performance are the indicators that have a great influence on the fatigue performance of spring steel. [0003] The uniformity of the microstructure and properties of the 55SiCr spring steel wire rod will have an important impact on the subsequent drawing p...

Claims

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Application Information

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IPC IPC(8): B21B45/02B21B37/74C21D8/06
CPCB21B45/0209B21B45/0224B21B37/74C21D8/065B21B2045/0212
Inventor 安绘竹车安韩立涛刘祥王宏亮尹一张博李建龙张欢徐曦袁野
Owner ANGANG STEEL CO LTD
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