Electric furnace production process of high-purity non-quenched and tempered steel for crankshaft

A production process, non-quenching and tempering technology, applied in the field of metallurgy, can solve the problems of low material utilization rate, cumbersome processing process, low success rate, etc., and achieve the effect of good cutting performance, high purity, uniform composition and low-magnification structure

Active Publication Date: 2015-02-25
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two methods have a common disadvantage that the material utilization rate is low, the cost is too high, the processing process is cumbersome and the success rate is low.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] This example is an electric furnace production process of high-purity non-quenched and tempered crankshaft steel. The mass percentage composition of high-purity non-quenched and tempered crankshaft steel is: C: 0.45%, Mn: 1.02%, P: 0.025%, S: 0.020%, Si: 0.20%, Cr: 0.05%, Alt: 0.015%, V: 0.07%, Ti: 0.025%, Ni: 0.20%, Cu: 0.04%, Mo: 0.01%, N: 0.0080%, O: 0.0020%, Ceq: 0.88%, the balance is Fe;

[0019] The technological process of the electric furnace production process of high-purity non-quenched and tempered crankshaft steel is: scrap steel + hot charging molten iron → EBT electric arc furnace smelting → LF refining → VD vacuum degassing treatment → continuous casting and pouring into billets;

[0020] During the smelting and tapping process of EBT electric arc furnace, manganese nitride alloy is used to control the N content in molten steel within the range of 200ppm, and other elements except S and Alt are adjusted to 85% of the lower limit of the judgment range by u...

Embodiment 2

[0025] This example is an electric furnace production process of high-purity non-quenched and tempered crankshaft steel. The mass percentage composition of high-purity non-quenched and tempered crankshaft steel is: C: 0.46%, Mn: 1.08%, P: 0.02%, S: 0.025%, Si: 0.25%, Cr: 0.1%, Alt: 0.025%, V: 0.09%, Ti: 0.02%, Ni: 0.1%, Cu: 0.1%, Mo: 0.03%, N: 0.01%, O: 0.001%, Ceq: 0.92%, the balance is Fe;

[0026] The technological process of the electric furnace production process of high-purity non-quenched and tempered crankshaft steel is: scrap steel + hot charging molten iron → EBT electric arc furnace smelting → LF refining → VD vacuum degassing treatment → continuous casting and pouring into billets;

[0027] During the smelting and tapping process of EBT electric arc furnace, manganese nitride alloy is used to control the N content in molten steel within the range of 250ppm, and other elements except S and Alt are adjusted to 85% of the lower limit of the judgment range by using corre...

Embodiment 3

[0032] This example is an electric furnace production process of high-purity non-quenched and tempered crankshaft steel. The mass percentage composition of high-purity non-quenched and tempered crankshaft steel is: C: 0.48%, Mn: 1.12%, P: 0.01%, S: 0.030%, Si: 0.30%, Cr: 0.25%, Alt: 0.035%, V: 0.12%, Ti: 0.01%, Ni: 0.09%, Cu: 0.15%, Mo: 0.05%, N: 0.0140%, O: 0.001%, Ceq: 0.96%, the balance is Fe;

[0033] The technological process of the electric furnace production process of high-purity non-quenched and tempered crankshaft steel is: scrap steel + hot charging molten iron → EBT electric arc furnace smelting → LF refining → VD vacuum degassing treatment → continuous casting and pouring into billets;

[0034] During the smelting and tapping process of EBT electric arc furnace, manganese nitride alloy is used to control the N content in molten steel within the range of 280ppm, and other elements except S and Alt are adjusted to 85% of the lower limit of the judgment range by usin...

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PUM

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Abstract

The invention relates to an electric furnace production process of high-purity non-quenched and tempered steel for a crankshaft. The steel comprises the following components in percentage by weight: 0.45%-0.48% of C, 1.02%-1.12% of Mn, less than or equal to 0.025% of P, 0.020%-0.030% of S, 0.20%-0.30% of Si, 0.05%-0.25% of Cr, 0.015%-0.035% of Alt, 0.07%-0.12% of V, less than or equal to 0.025% of Ti, less than or equal to 0.20% of Ni, 0.04%-0.15% of Cu, 0.01%-0.05% of Mo, 0.0080%-0.0140% of N, less than or equal to 0.0020% of O and 0.88%-0.96% of Ceq. The electric furnace production process comprises the following steps of: preparation of scrap steel, hot charging of molten iron, electric-arc furnace smelting, LF refining, VD vacuum degassing treatment and continuous casting. The steel is uniform in steel component and macrostructure and low in anisotropy and has no need of quenching and tempering treatment.

Description

technical field [0001] The invention relates to a production process of non-quenched and tempered steel in the field of metallurgy, in particular to an electric furnace production process of non-quenched and tempered steel for automobile crankshafts. Background technique [0002] In recent years, with the increase of automobile production and automobile ownership, the pressure of energy conservation and emission reduction has also increased rapidly. The energy consumption of automobiles is mainly divided into three parts: one is energy consumption in the production of automobile raw materials; the other is the energy consumption in the manufacture of automobile parts; the third is the energy consumption in the use of automobiles. According to statistical results, in the life cycle of a car, the energy consumption of driving a car accounts for about 78.3%, the energy consumption of material production accounts for about 15%, and the energy consumption of automobile manufactur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/50C22C38/46C22C38/28C22C38/24C22C33/04C21C5/52
CPCC21C5/5211C22C38/001C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C38/18Y02P10/20
Inventor 朱守欣杨利委周剑李凯宋金平
Owner NANJING IRON & STEEL CO LTD
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