Spring steel and preparation method thereof

A spring steel and weight technology, applied in the field of spring steel, can solve the problems of low fatigue resistance, difficulty in grasping and realizing inclusion control, affecting fatigue performance, etc., and achieve good fatigue performance

Inactive Publication Date: 2010-03-17
PANGANG GROUP RESEARCH INSTITUTE CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In practical operation, it is difficult to grasp and achieve this kind of control of inclusions
For example, the paper "The Influence of Different Production Processes on the Size and Fatigue Properties of High-strength Spring Steel The production processes, although both achieve lower oxygen contents, have absolutely different inclusion size distributions and thus significantly affect fatigue properties”
That is to say, it is difficult to control the method of controlling the fatigue strength of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0041] According to the preparation method of the spring steel of the present invention, the method comprises that the spring steel raw material is subjected to preliminary refining, refining, cooling forming, rolling, quenching and tempering successively, wherein the composition of the spring steel raw material is such that the composition of the spring steel obtained is For, based on the total amount of the spring steel, the spring steel contains 0.56-0.64% by weight of C, 1.6-2% by weight of Si, 0.6-0.9% by weight of Mn, 0-0.015% by weight of Ti, 0.0055 - 0.03% by weight of S and 0.01-0.02% by weight of Als, the balance being Fe and unavoidable impurities, and the weight ratio of the S to the Als is 0.55-3, and the Als is acid-soluble aluminum.

[0042] Wherein, the method for preparing the spring steel of the present invention can adopt the existing process. For example, it can be carried out through the steps of primary smelting, refining, cooling forming, rolling, quench...

Embodiment 1-7

[0046] This example is used to illustrate the spring steel and its preparation method according to the present invention.

[0047] Put molten iron (the contents of various trace components: 3.74% by weight of C, 0.03% by weight of Si, 0.15% by weight of Mn, 0.083% by weight of P, and 0.016% by weight of S) into a 120-ton converter for primary smelting, blowing After 40 minutes of tapping, the tapping temperature is 1680°C. After tapping, adjust the composition of molten steel to the composition shown in Table 1 by adding pitch coke, ferrosilicon, ferromanganese, ferrochrome, and aluminum wire, and then add 840 kg of CaO containing 45% by weight, CaF 2 Refining slag of 10% by weight, refined at 1530-1555°C for 30 minutes, the refined molten steel was evacuated in RH vacuum device for 13 minutes (under the condition of vacuum degree less than 300Pa), and finally cast in 6 machines and 6 streams The 280×325mm slab was cast on the machine, and the cooling rate in the forced cooli...

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Abstract

The invention discloses spring steel. Based on the total weigh of the spring steel, the spring steel comprises 0.56 to 0.64 weight percent of C, 1.6 to 2 weight percent of Si, 0.6 to 0.9 weight percent of Mn, 0 to 0.015 weight percent of Ti, 0.0055 to 0.03 weight percent of S, 0.01 to 0.02 weight percent of Als and the balance of Fe and inevitable impurities, wherein the weight ratio of the S to the Als is 0.55 to 3; and the Als is acid soluble aluminum. The invention also provides a preparation method of the spring steel, which comprises: subjecting the raw material of the spring steel to primarily smelting, refining, cold forming, rolling, quenching and tempering, wherein the composition of the raw material of the spring steel ensures the composition of the spring steel obtained is the same as the composition of the spring steel of the invention. The spring steel is high in fatigue resistance. The production method is simple and reduces cost.

Description

technical field [0001] The invention relates to spring steel, in particular to a spring steel with excellent fatigue performance and a preparation method of the spring steel. Background technique [0002] Performance indicators such as strength, toughness and grain size can only evaluate spring steel indirectly, and fatigue resistance is the most important indicator to reflect spring steel. It can not only reflect the strength, toughness and grain size of spring steel and other performance indicators The advantages and disadvantages of the spring steel can also reflect the best match between the above properties and the impact of the match between the properties on the service life of the spring steel. The intrinsic quality of spring steel is closely related to the fatigue resistance of spring steel. Therefore, no matter the research on the variety of spring steel or the production process, it is the ultimate goal to improve the fatigue performance of spring steel. [0003...

Claims

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Application Information

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IPC IPC(8): C22C38/14C21D1/18
Inventor 刘明熊元波冯妍邓通武李光跃
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD
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