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Non-quenched and tempered steel, its production method, and rupture connecting rod manufactured therefrom

A production method and technology of non-quenched and tempered steel, which are applied in the direction of connecting rod, process efficiency improvement, mechanical equipment, etc. Good low temperature impact toughness, high fatigue strength, and the effect of improving fatigue toughness

Active Publication Date: 2017-11-03
SUZHOU SUXIN SPECIAL STEEL +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the defects of low fatigue strength, low low temperature impact toughness and poor fracture performance of non-quenched and tempered steel in the prior art, thereby providing a kind of high fatigue strength, good low temperature impact toughness, Non-quenched and tempered steel with excellent fracture performance

Method used

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  • Non-quenched and tempered steel, its production method, and rupture connecting rod manufactured therefrom
  • Non-quenched and tempered steel, its production method, and rupture connecting rod manufactured therefrom
  • Non-quenched and tempered steel, its production method, and rupture connecting rod manufactured therefrom

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Effect test

Embodiment 1

[0040] This embodiment provides a production method of non-quenched and tempered steel, which mainly includes electric furnace smelting steps, LF furnace refining steps, VD furnace refining steps, continuous casting steps, hot rolling steps and cooling steps, wherein:

[0041] In the electric furnace smelting step, the C content of the molten iron is 0.05%, and the control range of the end point temperature is 1620°C.

[0042] In the refining step of LF furnace, niobium iron ore is added, and white slag is made for deoxidation. Nb element can refine austenite grains, increase the interface, facilitate the uniform precipitation of ferrite, and improve the fatigue toughness of steel; at the same time, The white slag used is composed of ferrosilicon powder and silicon carbide, and the white slag retention time is 20min. Using the white slag and keeping it for 20min can fully reflect the steel slag interface, reduce the oxygen content and sulfur content in the steel; control the Mn...

Embodiment 2

[0055] This embodiment provides a production method of non-quenched and tempered steel, which mainly includes electric furnace smelting steps, LF furnace refining steps, VD furnace refining steps, continuous casting steps, hot rolling steps and cooling steps, wherein:

[0056] In the electric furnace smelting step, the C content range of the molten iron is 0.25%, and the control range of the end point temperature is 1680°C.

[0057] In the refining step of LF furnace, niobium iron ore is added, and white slag is made for deoxidation. Nb element can refine austenite grains, increase the interface, facilitate the uniform precipitation of ferrite, and improve the fatigue toughness of steel; at the same time, The white slag used is composed of ferrosilicon powder and silicon carbide, and the white slag retention time is 20min. Using the white slag and keeping it for 20min can fully reflect the steel slag interface, reduce the oxygen content and sulfur content in the steel; control ...

Embodiment 3

[0070] This embodiment provides a production method of non-quenched and tempered steel, which mainly includes electric furnace smelting steps, LF furnace refining steps, VD furnace refining steps, continuous casting steps, hot rolling steps and cooling steps, wherein:

[0071] In the electric furnace smelting step, the C content range of the molten iron is 0.15%, and the control range of the end point temperature is 1650°C.

[0072] In the refining step of LF furnace, niobium iron ore is added, and white slag is made for deoxidation. Nb element can refine austenite grains, increase the interface, facilitate the uniform precipitation of ferrite, and improve the fatigue toughness of steel; at the same time, The white slag used is composed of ferrosilicon powder and silicon carbide, and the white slag retention time is 20min. Using the white slag and keeping it for 20min can fully reflect the steel slag interface, reduce the oxygen content and sulfur content in the steel; control ...

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Abstract

The invention provides non-quenched and non-tempered steel, a production method of the non-quenched and non-tempered steel and a cracking connecting rod manufactured through the non-quenched and non-tempered steel. The non-quenched and non-tempered steel is prepared from, by mass percent, 0.46%-0.52% of C, 0.70%-0.80% of Si, 1.53%-1.60% of Mn, 0.008%-0.015% of P, 0.02%-0.035% of S, 0.15%-0.25% of Cr, 0.20%-0.25% of Ni, 0.04%-0.07% of Mo, 0.02%-0.04% of Al, 0.14%-0.16% of V, 0.025%-0.035% of Nb, 0.001%-0.002% of B, 0.14%-0.25% of N and the balance Fe and inevitable impurity elements. The fatigue toughness of the steel can be improved through the element Nb. The element B can be segregated in a grain boundary and fused in ferrite separated out of the grain boundary, the separated-out ferrite is strengthened, and the cracking performance is improved.

Description

technical field [0001] The invention relates to the technical field of non-quenched and tempered steel production, in particular to a non-quenched and tempered steel, a production method thereof and a snap-off connecting rod manufactured using the non-quenched and tempered steel. Background technique [0002] At present, C70S6 non-quenched and tempered steel is a widely used steel grade, and it is also the material for international general-purpose connecting rods. It has the characteristics of fracture brittle cleavage fracture and basically no plastic deformation. Breaking the connecting rod can improve the quality of the connecting rod and reduce the manufacturing cost of the connecting rod, and has broad market application prospects. However, when C70S6 non-quenched and tempered steel is used as a fracture material, its disadvantages are low low-temperature impact, brittleness and low fatigue strength, so it is not suitable for high-power engine connecting rods. [0003...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/32C22C38/18C22C38/12C22C38/08C21C7/10B22D11/111B22D11/115C21D8/00F16C7/00
CPCB22D11/111B22D11/115C21C7/10C21D8/00C22C38/001C22C38/02C22C38/04C22C38/08C22C38/12C22C38/18C22C38/32F16C7/00Y02P10/20
Inventor 谭利包耀宗刘栋林周志伟
Owner SUZHOU SUXIN SPECIAL STEEL
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