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Non-quenched and tempered steel and method for manufacturing automobile steering knuckle through non-quenched and tempered steel

A technology of automobile steering knuckle and non-quenched and tempered steel, which is applied to vehicle parts, transportation and packaging, etc., to achieve the effects of reducing costs, improving cutting performance, and excellent mechanical properties

Inactive Publication Date: 2020-10-16
SHAANXI AUTOMOBILE GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a non-quenched and tempered steel and a method for manufacturing automobile steering knuckles using non-quenched and tempered steel. The model designation is 37MnSiVSQ

Method used

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  • Non-quenched and tempered steel and method for manufacturing automobile steering knuckle through non-quenched and tempered steel
  • Non-quenched and tempered steel and method for manufacturing automobile steering knuckle through non-quenched and tempered steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A kind of non-quenched and tempered steel 37MnSiVSQ, the mass percent of each component is:

[0043] C: 0.35-0.39%; Si: 0.50-0.70%; Mn: 1.30-1.55%; P≤0.015%; S: 0.015-0.060%; Cr: 0.10-0.30%; ~0.05%; Nb: 0.020~0.035%; Ti: 0.015~0.035%; N: 0.015~0.020%; Ni≤0.25%; Mo≤0.10%; Avoid impurities.

[0044] Further, the composition also contains H and O, the content of which is: H≤2.0ppm, O≤15ppm.

[0045] Its composition design principle is as follows:

[0046] C: 0.35% to 0.39%, an important element determining the strength of non-quenched and tempered steel (37MnSiVSQ). To ensure the strength of steel, carbon is the most effective and cheap element, which can combine with strong carbide-forming elements V, Ti, Nb, Mo, etc. to form carbides to play the role of precipitation strengthening and fine-grain strengthening, which is beneficial to the strength of steel Increasing the carbon content is beneficial to prevent recrystallization and increase the recrystallization temper...

Embodiment 2

[0084] Use a kind of non-quenched and tempered steel 37MnSiVSQ of the present invention to manufacture the method for automobile steering knuckle:

[0085] Smelting non-quenched and tempered steel 37MnSiVSQ: steelmaking by electric furnace or converter → ladle refining LF → ladle vacuum degassing VD → continuous casting → controlled rolling and controlled cooling preparation round steel;

[0086] Controlled forging and controlled cold forging of the non-quenched and tempered steel 37MnSiVSQ produced by the above smelting:

[0087] The manufactured non-quenched and tempered steel 37MnSiVSQ round steel is sawed and blanked→induction heating→upsetting→preforming→forming→edge trimming→correction→controlled cooling→stack cooling→shot blasting, in which forging controlled forging and controlled cooling process, After the forging correction, the workpiece is immediately cooled by strong wind, and the cooling rate is controlled to cool to 550 ℃ ~ 650 ℃ stack cooling and slowly coole...

Embodiment 3

[0094] The difference from Example 2 is that the mass percent of the non-quenched and tempered steel 37MnSiVSQ is: C: 0.39; Si: 0.56; Mn: 1.36; P: 0.010; S: 0.04; Cr: 0.26; V: 0.15; Al: 0.02; N: 0.0150; Nb: 0.020; Ti: 0.015, Ni≤0.25; Mo≤0.10; Sn≤0.03; Cu≤0.20, the rest is Fe and unavoidable impurities.

[0095] 【O】=15.7ppm,【H】=1.1ppm; the final forging temperature is 1000~1050℃, and the mechanical properties are tested and analyzed: tensile strength Rm=970MPa, yield strength Re0.2=673MPa, elongation A=18 %, reduction of area Z=24%, impact energy AKu=38J.

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Abstract

The invention discloses non-quenched and tempered steel and a method for manufacturing an automobile steering knuckle through the non-quenched and tempered steel. The non-quenched and tempered steel comprises components including, by mass percent, 0.35-0.39% of C, 0.50-0.70% of Si, 1.30-1.55% of Mn, smaller than or equal to 0.015% of P, 0.015-0.060% of S, 0.10-0.30% of Cr, 0.10-0.15% of V, 0.01-0.05% of Al, 0.020-0.035% of Nb, 0.015-0.035% of Ti, 0.015-0.020% of N, smaller than or equal to 0.25% of Ni, smaller than or equal to 0.10% of Mo, smaller than or equal to 0.03% of Sn, smaller than orequal to 0.20% of Cu and the balance Fe and impurities. The free-cutting high-strength high-tenacity microalloying non-quenched and tempered steel is used for replacing 41CrS4 (or 42CrMo) quenched andtempered steel for implementing of the automobile steering knuckle controlled-forging and controlled-cooling manufacturing technology, the quenching and tempering heat treatment procedure is eliminated, the cost is reduced by 10-20%, meanwhile, the steering knuckle cutting machining performance is improved, and the technical level of the steering knuckle reaches the national advanced level.

Description

technical field [0001] The invention relates to the field of processing and application of automobile metal materials, in particular to non-quenched and tempered steel and a method for manufacturing automobile steering knuckles. Background technique [0002] Non-quenched and tempered steel is a kind of high-quality or special quality structural steel that reaches or approaches the mechanical properties of quenched and tempered steel through microalloying, controlled rolling (forging) and controlled cooling, etc., without quenching and tempering heat treatment. The abbreviation of medium-carbon micro-alloyed structural steel, also known as micro-alloyed steel, was developed in the 1970s due to the promotion of the oil crisis. The main driving force for the development and application of non-quenched and tempered steel is that its cost has been greatly reduced: ① Non-quenched and tempered steel is to add a small amount of microalloying elements Nb, V, Ti, B, etc. to medium car...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/58B23P15/00
CPCB23P15/00B23P2700/50C22C33/04C22C38/001C22C38/002C22C38/008C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/58
Inventor 严超峰包耀宗周湛吉光李栋谢余
Owner SHAANXI AUTOMOBILE GROUP
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