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High-carbon non-tempered steel for breaking connecting rod and manufacturing method thereof

A technology of non-quenched and tempered steel and a manufacturing method, which is applied in the field of steel, and can solve problems such as failure to meet technical requirements, poor thermal processing performance, and low tensile strength, so as to improve fracture performance, strong precipitation strengthening, and improve processing performance Effect

Inactive Publication Date: 2015-07-15
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] In summary, the fractured connecting rods in the prior art have the following defects: 1) low tensile strength; 2) poor thermal processing performance; 3) poor cracking and substandard quality, unable to meet relevant technical requirements

Method used

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  • High-carbon non-tempered steel for breaking connecting rod and manufacturing method thereof
  • High-carbon non-tempered steel for breaking connecting rod and manufacturing method thereof
  • High-carbon non-tempered steel for breaking connecting rod and manufacturing method thereof

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Embodiment Construction

[0097] The high-carbon non-quenched and tempered steel for breaking connecting rods and its manufacturing method described in the present invention will be further explained and illustrated in conjunction with specific examples below. However, the explanations and illustrations do not constitute improper limitations on the technical solution of the present invention. .

[0098] The high-carbon non-quenched and tempered steel for the breakage connecting rod in Examples A1-A8 and Comparative Examples B1 and B2 was manufactured according to the following steps:

[0099] (1) Primary smelting in electric furnace: the primary smelting of molten steel is carried out in an electric arc furnace of 60-150 tons, and the slag is frequently flowed to remove P during the oxidation period.

[0100] (2) Ladle refining + vacuum degassing: After the initial deoxidation of LF, add an alloy block and stir for 5-10 minutes. When the temperature of the molten steel is measured T≥1580℃, enter the va...

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Abstract

The invention discloses high-carbon non-tempered steel for breaking a connecting rod and a manufacturing method thereof. The high-carbon non-tempered steel comprises the following chemical elements in percentage by weight: 0.65%-0.85% of C, 0.15%-0.25% of Si, 0.50%-0.60% of Mn, 0.010%-0.045% of P, 0.060%-0.070% of S, 0.10%-0.20% of Cr, 0.55%-0.80% of Ni, 0.03%-0.04% of V, 010%-0.20% of W, 0.0120%-0.0160% of N, 0.0001%-0.0004% of Re and the balance of Fe and inevitable impurities. The manufacturing method comprises the following steps: electric furnace primary smelting; ladle refining and vacuum degassing; die casting or continuous casting; and steel bar rolling. The high-carbon non-tempered steel has relatively high strength and good breaking performance.

Description

technical field [0001] The invention relates to a steel product, in particular to a non-quenched and tempered steel product. The invention also relates to a method for manufacturing the non-quenched and tempered steel. Background technique [0002] Non-quenched and tempered steel is a new type of energy-saving steel material that combines rolling (or forging) and heat treatment. This steel material can save the quenching and tempering treatment (that is, quenching + high temperature tempering). At present, non-quenched and tempered steel is generally used in automobile connecting rods. In terms of the development of non-quenched and tempered steels for connecting rods, the use of non-quenched and tempered steels for breaking connecting rods is also a new development idea. With the rapid development of the automobile industry, domestic and foreign automobile manufacturers continue to apply new technology to improve product quality, reduce product cost, and improve production...

Claims

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Application Information

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IPC IPC(8): C22C38/60
Inventor 安金敏丁毅覃明刘湘江
Owner BAOSHAN IRON & STEEL CO LTD
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