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Wire rod for deep drawing cold drawn spring steel wire and preparation method thereof

A technology of spring steel wire and wire rod, which is applied in the field of spring steel, can solve the problems of high rate of broken wires in drawing and the inability to realize deep drawing, etc., and achieve the effect of increasing tail area shrinkage, good application prospects, and reducing production costs

Active Publication Date: 2021-10-22
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention provides a deep-drawing cold-drawn spring steel wire wire rod and a preparation method thereof. After certain component addition and multi-component optimization, the deep-drawing performance is improved and improved, and the preparation process is coordinated The improvement solves the problem that the electric furnace smelting deep-drawing cold-drawing spring steel wire wire rod has a high rate of drawing broken wires and deep drawing cannot be realized in the straight-drawing production process after omitting heat treatment.

Method used

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  • Wire rod for deep drawing cold drawn spring steel wire and preparation method thereof
  • Wire rod for deep drawing cold drawn spring steel wire and preparation method thereof
  • Wire rod for deep drawing cold drawn spring steel wire and preparation method thereof

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preparation example Construction

[0032] The second aspect of the present invention provides a method for preparing the above-mentioned wire rod for deep-drawing and cold-drawing spring steel wire, the steps comprising:

[0033] S1. Electric furnace smelting: pure oxygen smelting throughout the whole process, using low N carburizer to increase carbon, electric furnace end point control C: 0.06% ~ 0.10%, adding deoxidizer to the electric furnace to obtain water oxygen activity ≤ 20×10 -6 molten steel;

[0034] S2, LF furnace refining: the molten steel obtained in S1 is refined in an LF furnace, and the oxygen activity of the LF molten steel is controlled to be ≤10×10 -6 ;

[0035] S3, continuous casting: the carbon segregation index of the control center is 1.00-1.15 to obtain a steel billet meeting the chemical composition requirements described in claim 1;

[0036] S4. The steel billet is rolled after being heated in a heating furnace, and the product is obtained by controlled cooling after rolling. The rol...

Embodiment 1

[0039]This embodiment provides a wire rod for deep drawing and cold drawn spring steel wire and a preparation method thereof. Hot-rolled wire rods are rolled into hot-rolled wire rods through electric furnace smelting, LF furnace refining, continuous casting, heating furnace heating, rolling, and controlled cooling. The specific production steps are: scrap steel sorting→electric furnace→LF→VD→continuous casting 150 billet→inspection→150mm×150mm billet→heating→high pressure water descaling→rough rolling unit→intermediate rolling unit→pre-finishing rolling unit→water tank→ Finishing mill → water tank → reducing and sizing unit → water tank → laying head → Stelmore cooling → coil collection → P&F line → cutting head, tail → quality inspection, sampling → bundling → weighing → marking → coil unloading → storage. Its specific production process is as follows:

[0040] Electric furnace smelting: Tapping slag is used to keep the slag from entering the ladle; aluminum block is added...

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Abstract

The invention discloses a wire rod for deep drawing and cold drawn spring steel wire and a preparation method thereof. Using a series of measures such as electric furnace, LF furnace, VD furnace, continuous casting process control, etc., through the organic combination of chemical composition optimization design, smelting process control, controlled rolling and controlled cooling process, the steel purity level of deep drawing wire rod It has been greatly improved, the N content is controlled within 70PPm, the central carbon segregation control is ≤1.09, the sorbite rate is ≥85%, and the mechanical performance (same circle) fluctuation of the cleaning rod is within 50Mpa. Overcome the influence of electric furnace smelting residual elements and N content on drawing performance, and realize the synergy between tensile strength and sorbite ratio. Through the optimization process test, some deep drawn products can be produced without VD furnace under certain conditions, reducing the production cost. The deep-drawn cold-drawn spring steel wire rod obtained by this method enables downstream users to reduce the rate of broken wires during cold drawing and the rate of broken wires of the coil spring during use, improve operating efficiency, and obtain excellent fatigue performance .

Description

technical field [0001] The invention belongs to the technical field of spring steel, and in particular relates to a wire rod for deep drawing and cold drawn spring steel wire and a preparation method thereof. Background technique [0002] As a very important shock absorption and functional component, spring is widely used in automobile manufacturing and daily life. It is a high value-added product with a very large market demand. According to statistics, the demand for springs will continue to grow, and the demand for spring steel for parts will also increase simultaneously. For example, according to the statistics of the German Spring Industry Association (VDFI), in addition to suppliers, 62% of buyers in its spring steel industry come from the automotive industry. In Japan, the springs used in automobiles and motorcycles account for about 65% of the total spring steel production. Therefore, the strong development of the automobile industry will inevitably lead to the vig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/04C21C7/06C22C38/02C22C38/04C22C38/20B21B37/74
CPCB21B37/74C21C7/0006C21C7/06C22C33/04C22C38/001C22C38/002C22C38/008C22C38/02C22C38/04C22C38/20
Inventor 晁月林周洁孙齐松熊家泽杨雄丁宁吴少斌
Owner SHOUGANG CORPORATION
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