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Steel wire rod for deep drawing of cold-drawn spring steel wire and preparation method thereof

A spring steel wire and deep drawing technology, applied in the field of spring steel, can solve the problems of inability to realize deep drawing, high wire breakage rate in drawing, achieve good application prospects, realize deep drawing, and improve the level of steel purity. Effect

Active Publication Date: 2020-05-26
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.

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  • Steel wire rod for deep drawing of cold-drawn spring steel wire and preparation method thereof
  • Steel wire rod for deep drawing of cold-drawn spring steel wire and preparation method thereof
  • Steel wire rod for deep drawing of 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 steel wire rod for deep drawing of a cold-drawn spring steel wire and a preparation method thereof. By taking a series of measures such as electric furnace smelting, LF furnace refining, VD furnace treatment and continuous casting process control and organically combining chemical composition optimization design, smelting process control and a controlled rolling and controlled cooling process, the level of steel purity of the steel wire rod for deep drawing is greatly improved, the N content is controlled to be within 70 PPm, the central carbon segregation is controlled to be less than or equal to 1.09, the sorbite rate is greater than or equal to 85%, and the mechanical property of the whole rod (the same circle) fluctuates within 50 MPa. The influence of electric furnace smelting residual elements and the N content on the drawing property is overcome, and the synergy of the tensile strength and the sorbite rate is realized. By optimizing process tests, partof deep-drawn products can be produced without a VD furnace under certain conditions, and the production cost is reduced. With the steel wire rod for deep drawing of the cold-drawn spring steel wire obtained by the method, a downstream user can reduce the drawing breakage rate and the coil spring breakage rate in the cold drawing process during usage, the working efficiency is improved, and an excellent fatigue property is obtained.

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 Applications(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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