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A heat treatment process for regulating the yield ratio of medium manganese steel

A yield-strength ratio and process technology, applied in the field of heat treatment of sheet products, can solve the problems of difficulty in releasing stress concentration, no obvious improvement in steel plasticity, poor stability, etc., and achieve the effect of improving the seismic grade.

Active Publication Date: 2019-06-04
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the stability of the retained austenite is poor, a slight stress will also lead to martensitic transformation, which does not contribute to the plasticity of the steel; if the retained austenite is too stable, when the deformation is large, the retained austenite will Martensitic transformation cannot occur for a long time, local stress concentration is difficult to be released, cracks begin to occur, and the plasticity of steel has not been significantly improved

Method used

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  • A heat treatment process for regulating the yield ratio of medium manganese steel
  • A heat treatment process for regulating the yield ratio of medium manganese steel
  • A heat treatment process for regulating the yield ratio of medium manganese steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Medium manganese steel with a thickness of 60mm, the mass percentage of manganese content is 5.5%, figure 1 It is an optical micrograph of the metallographic structure of the medium manganese steel in Example 1, and the metallographic structure is tempered martensite + a small amount of reverse transformed austenite (M / A island) multiphase structure. The yield strength is 710MPa, the yield strength ratio is 0.93, the elongation is 19%, and the transverse impact energy absorbed by the Charpy impact test at -60°C is 127J, 133J, and 122J.

[0025] The above-mentioned medium manganese steel heat treatment process is carried out according to the following steps:

[0026] Quenching: Put a 60mm thick steel plate into a continuous heat treatment furnace, heat it at 850°C, keep it warm for 100 minutes, and cool it to room temperature after it comes out of the furnace, and control the cooling rate at 3°C / s-15°C / s;

[0027] Tempering: Put a 60mm thick steel plate into a continuou...

Embodiment 2

[0029] Medium manganese steel with a thickness of 40mm, the mass percentage of manganese content is 5.1%, figure 2 It is an optical micrograph of the metallographic structure of the medium manganese steel in Example 2, and the metallographic structure is tempered martensite + a small amount of reverse transformed austenite structure (M / A island) + a small amount of secondary martensite multiphase structure . The yield strength is 660MPa, the yield strength ratio is 0.82, the elongation is 24%, and the transverse impact energy absorbed by the Charpy impact test at -60°C is 154J, 149J, and 163J.

[0030] The above-mentioned medium manganese steel heat treatment process is carried out according to the following steps:

[0031] Quenching: Put a 40mm thick steel plate into a continuous heat treatment furnace, heat at 840°C, keep it warm for 110 minutes, and cool it to room temperature after being out of the furnace, and control the cooling rate at 3°C / s-15°C / s;

[0032] Temperin...

Embodiment 3

[0034] Medium manganese steel with a thickness of 30mm, the mass percentage of manganese content is 4.8%, image 3 It is an optical micrograph of the metallographic structure of the medium manganese steel in Example 3, and the metallographic structure is tempered martensite + reverse transformed austenite structure (M / A island) + secondary martensite multiphase structure. The yield strength is 560MPa, the yield strength ratio is 0.65, the elongation is 32%, and the transverse impact energy absorbed by the Charpy impact test at -60°C is 226J, 218J, and 233J.

[0035] The above-mentioned medium manganese steel heat treatment process is carried out according to the following steps:

[0036] Quenching: Put a 30mm thick steel plate into a continuous heat treatment furnace at a heating temperature of 830°C and keep it warm for 110 minutes. After leaving the furnace, it is water-cooled to room temperature, and the cooling rate is controlled at 3°C / s-15°C / s;

[0037] Tempering: Put a...

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Abstract

The invention relates to a heat treatment process for regulating controlling the yield strength ratio of medium manganese steel. The heat treatment process of quenching and two-phase region high-temperature tempering is adopted. When the quenching temperature is Ac3+(20-60) DEG C, and hypoeutectoid steel is heated at Ac3, a ferrite is completely converted to the temperature of austenite, and the heat preservation time is 1.5-2.0min / mm; when the tempering temperature is Ac1+(10-70) DEG C, and the hypoeutectoid steel is heated at Ac1, the ferrite starts to be converted to the temperature of austenite, and the heat preservation time is 1.7-2.5min / mm. The yield strength ratio of medium manganese steel is regulated between 0.65-0.93 through the quenching and tempering process, and the yield strength is regulated between 500-690MPa.

Description

technical field [0001] The invention relates to a heat treatment process for plate products, in particular to a heat treatment process for adjusting the yield ratio of medium manganese steel. Background technique [0002] The research on manganese alloy steel began in 1840 and has been widely used in automobile manufacturing, mining machinery and other fields. At present, with the advancement of the national marine strategy, medium manganese steel has attracted much attention due to its unique performance advantages and has broad application prospects. [0003] Manganese is an element that expands the austenite phase zone and reduces the Ac 1 and Ms point, every time 1% of Mn element is added, the martensitic transformation transition point decreases by about 30.4°C, and the austenite rich in Mn element is more likely to form stable retained austenite at room temperature. At the same time, the addition of Mn element in low carbon steel will make the proeutectoid ferrite pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/18
CPCC21D1/18C21D2211/001C21D2211/008
Inventor 李强赵荣贵尹雨群孙超单以刚
Owner NANJING IRON & STEEL CO LTD
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