Reheat-crack resistant W-containing high-strength low-alloy heat-resistant steel

A high-strength, low-alloy, reheat cracking technology, applied in the field of heat-resistant steel, can solve the problems of increasing the process, unsatisfactory effect of preventing reheat cracks, and increasing labor intensity, so as to suppress reheat cracks and solve reheat cracks. Sensitive to thermal cracking issues, results with reliable results

Active Publication Date: 2019-01-25
WUHAN UNIV
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Problems solved by technology

In addition, it is also proposed to suppress reheating cracks by adopting harsh welding processes, such as increasing the preheating temperature, adopting multi-layer welding passes or tempering passes, or increasing intermediate heat treatment, etc. These technological measures increase the process and increase the labor intensity. , reduces welding efficiency, greatly increases production costs, and the effect of preventing reheat cracks is not satisfactory, and does not fundamentally solve the problem

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  • Reheat-crack resistant W-containing high-strength low-alloy heat-resistant steel
  • Reheat-crack resistant W-containing high-strength low-alloy heat-resistant steel
  • Reheat-crack resistant W-containing high-strength low-alloy heat-resistant steel

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Embodiment Construction

[0062] Below by embodiment, in conjunction with accompanying drawing, technical scheme of the present invention is described further in detail:

[0063] The purpose of the present invention is to provide a novel low-alloy heat-resistant steel which resists reheating cracks, which greatly improves the resistance Ability to reheat cracks. The steel can be safely and reliably used in super (super) critical thermal power plants.

[0064] The chemical composition has the greatest influence on the reheat crack susceptibility of low-alloy heat-resistant steel. C, W, Mo, V, Nb, Ti and other alloying elements will increase the tendency of reheating cracks, but for heat-resistant steel, W and Mo are dissolved in the matrix to provide solid solution strengthening, and V, Nb, Ti, etc. form fine dispersed carbon nitrogen Compounds provide precipitation strengthening, so they are key elements to improve the high temperature creep strength of materials. In order to obtain sufficient high ...

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Abstract

The invention provides a reheat-crack resistant W-containing high-strength low-alloy heat-resistant steel, which comprises, by mass, 0.04-0.11% of C, lower than 0.50% of Si, 0.10-0.60% of Mn, lower than 0.03% of P, lower than 0.01% of S, lower than 0.40% of Ni, 1.90-2.60% of Cr, 0.20-0.30% of V, 0.02-0.08% of Nb, 0.05-0.30% of Mo, 1.45-1.75% of W, 0.01-0.06% of Ti, 0.001-0.012% of B, lower than 0.03% of Al, lower than 0.01% of N, and the balance being Fe and inevitable impurity. The heat-resistant steel has excellent reheat crack resistance property and can be applied to high-temperature members of supercritical (ultra-supercritical) thermal power generating units.

Description

technical field [0001] The invention belongs to the technical field of heat-resistant steel, and in particular relates to a high-strength, low-alloy heat-resistant steel, which has excellent reheat crack resistance, and is resistant to the heat-affected zone of coarse grains formed during post-weld heat treatment or high-temperature service. Insensitive to intergranular cracks. Background technique [0002] In order to reduce the environmental pollution caused by coal-fired power generation, it is necessary to develop efficient and clean super (super) critical thermal power units. At present, the main way to improve the efficiency of thermal power plants is to increase the steam temperature and pressure, which puts forward higher requirements for the high temperature and high pressure resistance of materials, and requires the development of high-strength heat-resistant steel to meet the needs of boiler parameters. [0003] At present, the development of boiler steel has two...

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54
CPCC22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54
Inventor 王学李勇李健杨华春敬仕煜夏彩荥
Owner WUHAN UNIV
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