A Heat Treatment Process for High Strength and Toughness 27simn Steel

A high-strength toughness, high-tech technology, applied in the field of heat treatment of high-strength toughness 27SiMn steel, can solve problems such as insufficient plasticity and toughness

Inactive Publication Date: 2015-08-05
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

27SiMn quenched and tempered tensile strength ≥ 980MPa, yield strength ≥ 835MPa, elongation ≥ 12.0%, reduction of area ≥ 40%, impact energy ≥ 39J, sufficient strength, but insufficient plasticity and toughness

Method used

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  • A Heat Treatment Process for High Strength and Toughness 27simn Steel
  • A Heat Treatment Process for High Strength and Toughness 27simn Steel
  • A Heat Treatment Process for High Strength and Toughness 27simn Steel

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Embodiment Construction

[0018] A 27SiMn steel with the following mass percent chemical composition: 0.26%C, 1.20%Si, 1.26%Mn, 0.11%Cr, 0.06%Ni, 0.06%Cu, 0.01%Mo, 0.03%Ti, 0.014%P, 0.016% %S, the balance is Fe.

[0019] The process parameters of the staged quenching heat treatment used in the embodiment are shown in Table 1. The microscopic schematic diagram of the optical microscope of the metallographic structure of the hot-rolled material and the schematic diagram of the scanning electron microscope of the metallographic structure after the heat treatment of Example 1 are respectively as follows figure 2 and Figure 3a and Figure 3b shown. It can be seen that the structure of the hot-rolled material is pearlite + ferrite, and after heat treatment by stage quenching, the structure is bainite.

[0020] The mechanical properties of the hot-rolled material and conventional quenched and tempered heat treatment are shown in Table 2. The tensile strength of the hot-rolled material is 689MPa, the yie...

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Abstract

The invention relates to a heat treatment process for high-toughness 27SiMn steel. The heat treatment process comprises the following steps: after sufficiently heating and austenitizing, carrying out oil cooling to a temperature which is slightly higher than a bainite transformation temperature, taking out and carrying out air cooling to a room temperature so as to slowly have sufficient bainite transformation; and finally, carrying out low-temperature annealing. After the treatment of a process method, a 27SiMn steel tissue is bainite and the steel has very good strength, plasticity and toughness match, so that the higher and higher performance requirements on construction machinery manufacturing can be met.

Description

technical field [0001] The invention belongs to the field of metal materials, and relates to a high-strength toughness 27SiMn steel, in particular to a heat treatment process for the high-strength toughness 27SiMn steel. Background technique [0002] With the development of industry and the advancement of science and technology in various countries in the world, the design of construction machinery is increasingly developing in the direction of lightweight, large-scale, and high-parameters. high demands. As a steel for mining support equipment, 27SiMn is mainly used to manufacture pillars for single hydraulic cylinders that support coal seams during coal mining. The steel is mainly used in the quenched and tempered state, but there is no report on the use in the state of bainite structure. [0003] At present, the height of coal mining tunnels is continuously increasing, and higher requirements are placed on the strength and toughness of the pillar materials of the single ...

Claims

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Application Information

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IPC IPC(8): C21D1/19C21D6/00
Inventor 刘雅政张朝磊周乐育蒋波文成
Owner UNIV OF SCI & TECH BEIJING
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