Production method for controlling large-sized hard inclusions in spring steel wire rods

A technology for controlling springs and production methods, applied in the direction of manufacturing converters, improving process efficiency, etc., can solve the problems that the fatigue life of high-strength springs cannot be guaranteed, and the plastic deformation of inclusions cannot be guaranteed, so as to reduce the size of inclusions, oxidation The effect of reducing the diameter of inclusions and avoiding slag entrainment

Active Publication Date: 2020-11-24
吕梁建龙实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above two patent applications did not pay attention to the reasonable control of the composition of oxide inclusions, and the plastic deformation of the inclusions during the rolling process cannot be guaranteed, and the fatigue life requirements of high-strength springs cannot be guaranteed.

Method used

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  • Production method for controlling large-sized hard inclusions in spring steel wire rods
  • Production method for controlling large-sized hard inclusions in spring steel wire rods
  • Production method for controlling large-sized hard inclusions in spring steel wire rods

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Embodiment 1-8

[0032] Embodiment 1-8: The production method for controlling the large-sized hard inclusions in the spring steel wire rod is specifically described as follows.

[0033] (1) Production process: The above-mentioned process is used for production. The specific parameters of the process in each embodiment are shown in Table 1, and the slag composition of the LF refining process is shown in Table 2.

[0034] Table 1: The processing parameters of each embodiment

[0035]

[0036] Table 2: Slag composition of LF process (wt.%)

[0037]

[0038] (2) Product composition: The main chemical composition of the spring steel wire rod obtained in each embodiment is shown in Table 3, and the balance is Fe and unavoidable impurities.

[0039] Table 3: The main chemical composition (wt%) of each embodiment wire rod

[0040]

[0041] (3) Detection and analysis: Sampling the hot-rolled wire rod obtained by this method, and performing SEM-EDS detection and analysis on the inclusions in ...

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Abstract

The invention discloses a production method capable of controlling large hard inclusions in a spring steel wire rod. The method comprises procedures of converter smelting, LF refining, continuous casting and heating cogging-down, wherein in the converter smelting procedure, carbon deoxidization and Mn-Si composite deoxidization are adopted sequentially in a deoxidization and alloying process of converter tapping, and a weight ratio of Mn to Si in alloy added in Mn-Si composite deoxidization is larger than or equal to 5.0; in the LF refining procedure, slag is formed by premelting and refiningsynthetic slag, target alkalinity w(CaO) / w(SiO2) is 0.80-1.2, w(Al2O3) in the slag is less than or equal to 3%, w(MnO)+w(MgO) is less than or equal to 10%, and the balance accounts for 5% or less. According to the spring steel hot-rolled wire rod produced with the method, diameter of oxide inclusions on a cross section of the wire rod is reduced effectively; after drawing, heat treatment and shotblasting of the wire rod, rotating and bending fatigue life of a spring wire reaches 1*10<7> or longer, and the fatigue life of a processed high-strength automotive suspension spring reaches 1*10<6> or longer.

Description

technical field [0001] The invention relates to a production method of a steel wire rod, in particular to a production method for controlling large-sized hard inclusions in a spring steel wire rod. Background technique [0002] The higher the strength of the metal material, the more significant the impact of inclusions on its fatigue properties. Non-metallic inclusions form a mosaic structure with the matrix in the steel. During the heating or cooling process of steel, mosaic stress will be generated around the inclusions due to the difference in expansion coefficient. If the number of inclusions is large and the diameter is large, the mosaic stress field will increase. Superposition, the stress of the workpiece during service and the mosaic stress are superimposed, so that the stress around the inclusion exceeds the yield limit of the steel, resulting in cracks and the formation of fatigue sources. With the development of high-strength steel for springs, fatigue fracture w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/28C21C7/00C21C7/06C21C7/076
CPCC21C5/28C21C7/0006C21C7/06C21C7/076Y02P10/20
Inventor 孟耀青郑永瑞田新中董庆崔娟赵昊乾吕海瑶黄翠环赵垒阎丽珍姬旦旦秦树超逯志方王伟
Owner 吕梁建龙实业有限公司
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