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Low-cost non-quenched and non-tempered crankshaft steel 48MnV-C and production method thereof

A production method, 48mnv-c technology, applied in the direction of furnace type, furnace, heat treatment furnace, etc., can solve the problems of affecting the performance of steel mills, high cost, and increased energy and medium consumption, and achieve the control of dimensional accuracy and effective Benefits to production organization

Inactive Publication Date: 2018-12-14
BENGANG STEEL PLATES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Considering the cost of alloying and the ultimate goal of ensuring that all performances are qualified, production according to the original process route has the main defect of high cost, resulting in poor market competitiveness and seriously affecting the performance of steel mills
At the same time, due to the strict controlled rolling and controlled cooling system in the past, it is easy to cause a large load on equipment and the adverse effects of increased energy and medium consumption.

Method used

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  • Low-cost non-quenched and non-tempered crankshaft steel 48MnV-C and production method thereof
  • Low-cost non-quenched and non-tempered crankshaft steel 48MnV-C and production method thereof
  • Low-cost non-quenched and non-tempered crankshaft steel 48MnV-C and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Simultaneously according to another aspect of the present invention, a kind of production method of low-cost non-quenched and tempered crankshaft steel 48MnV-C is provided: comprising the steps of converter-RH refining-LF refining-continuous casting, wherein,

[0024] 1) During the RH vacuum treatment, nitrogen is used as the lifting gas, and the vacuum is pre-evacuated. After the vacuum slide valve is opened, the minimum vacuum degree is quickly reached, and the degassing process is performed. During the degassing process, the vacuum pressure is required to be less than 100pa and the holding time is ≥ 15min. Take component samples when RH starts to circulate for 5 minutes. According to the reported values ​​of components, C, Si, Cr, and V elements are adjusted according to the lower limit value of refining components, and the amount of alloy added in LF furnace should be reduced as much as possible to make full use of the degassing of RH. Features. The RH cycle time is...

Embodiment 2

[0030] Simultaneously according to another aspect of the present invention, a kind of production method of low-cost non-quenched and tempered crankshaft steel 48MnV-C is provided: comprising the steps of converter-RH refining-LF refining-continuous casting, wherein,

[0031] 1) During the RH vacuum treatment, nitrogen is used as the lifting gas, and the vacuum is pre-evacuated. After the vacuum slide valve is opened, the minimum vacuum degree is quickly reached, and the degassing process is performed. During the degassing process, the vacuum pressure is required to be less than 100pa and the holding time is ≥ 15min. Take component samples when RH starts to circulate for 5 minutes. According to the reported values ​​of components, C, Si, Cr, and V elements are adjusted according to the lower limit value of refining components, and the amount of alloy added in LF furnace should be reduced as much as possible to make full use of the degassing of RH. Features. The RH cycle time is...

Embodiment 3

[0037] Simultaneously according to another aspect of the present invention, a kind of production method of low-cost non-quenched and tempered crankshaft steel 48MnV-C is provided: comprising the steps of converter-RH refining-LF refining-continuous casting, wherein,

[0038] 1) During the RH vacuum treatment, nitrogen is used as the lifting gas, and the vacuum is pre-evacuated. After the vacuum slide valve is opened, the minimum vacuum degree is quickly reached, and the degassing process is performed. During the degassing process, the vacuum pressure is required to be less than 100pa and the holding time is ≥ 15min. Take component samples when RH starts to circulate for 5 minutes. According to the reported values ​​of components, C, Si, Cr, and V elements are adjusted according to the lower limit value of refining components, and the amount of alloy added in LF furnace should be reduced as much as possible to make full use of the degassing of RH. Features. The RH cycle time is...

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Abstract

The invention belongs to the technical field of production of non-quenched and non-tempered crankshaft steel, and particularly relates to a low-cost non-quenched and non-tempered crankshaft steel 48MnV-C. The low-cost non-quenched and non-tempered crankshaft steel 48MnV-C comprises the main microalloying elements of, by weight, 0.05%-007% of V, 0.02%-0.03% Alt, 150-180ppm of N and the remaining elements of 0.44%-0.48% of C, 0.17%-0.25% of Si, 0.90%-1.00% of Mn, less than or equal to 0.020% of P, 0.010%-0.015% of S, 0.10%-0.15% of Cr and the balance Fe. The invention also provides a productionmethod of the steel. The method comprises the following steps of converter, RH refining, LF refining, rectangular billet continuous casting, 800 rolling mill rolling, and the converter-RH-LF-continuous casting process is used for producing the non-quenched and non-tempered crankshaft steel 48MnV-C, the steel has high strength and hardness, good machinability, uniform organization and high purity,machined finished steel is almost free of magnetic trace defects, and the finished crankshaft steel is at the leading level in the domestic industry.

Description

technical field [0001] The invention belongs to the production technical field of non-quenched and tempered crankshaft steel, specifically designs a low-cost non-quenched and tempered crankshaft steel 48MnV-C, and also provides a production method of the steel. Background technique [0002] 48MnV-C steel is one of the main steel types of non-quenched and tempered crankshafts in China in recent years, and it is a Mn-V-N series F-P type free-cutting steel. The steel is required to have high strength, high hardness, good machinability, uniform structure and high purity in the steel, so as to ensure the service life of the crankshaft. The role of nitrogen in 48MnV-C is mainly to enhance the precipitation strengthening effect and refine the grain. Especially for vanadium-containing microalloyed non-quenched and tempered steel, the yield strength will increase by 5Mpa for every 0.001% nitrogen added. Increasing the nitrogen content in the steel expands the precipitation range of...

Claims

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Application Information

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IPC IPC(8): C21C7/00C21C7/06C21C7/10C21D1/28C21D6/00C21D8/02C21D9/00C22C33/04C22C38/02C22C38/04C22C38/06C22C38/24B21B1/46B21B37/74
CPCB21B1/463B21B37/74C21C7/0006C21C7/06C21C7/10C21D1/28C21D6/002C21D6/005C21D6/008C21D8/0205C21D9/0081C21D2211/005C21D2211/009C22C33/04C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/24
Inventor 董学涛卢秉军林东齐峰任忠钟晓丹王亚东阚利志
Owner BENGANG STEEL PLATES
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