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Martensite heat-resistant steel

A heat-resistant steel and martensite technology, which is applied in the field of composition design of new 9Cr-3W-3Co martensitic heat-resistant steel materials, can solve the problems of insufficient service temperature and lasting life.

Pending Publication Date: 2021-12-14
KOCEL STEEL
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Problems solved by technology

[0003] The invention provides a new type of martensitic heat-resistant steel, which optimizes and adjusts the alloy composition of 9% to 12% Cr steel to obtain a new type of 9Cr-3W-3Co martensitic heat-resistant steel material, which overcomes the existing There are problems of insufficient service temperature and durable life of heat-resistant steel materials, and the service temperature of existing heat-resistant steel materials is increased from 600-620°C to 630-650°C to further increase the service temperature and durable life of materials, and significantly improve the service life of the unit Efficiency, to achieve the purpose of energy saving and emission reduction

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Embodiment Construction

[0026] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associated drawings. Preferred embodiments of the invention are shown in the accompanying drawings. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0027] The 9Cr-3W-3Co steel material in the prior art can only be used in the pipe parts, and the composition is calculated according to the weight percentage as attached figure 1 As shown, the steam oxidation resistance of the material is improved by aluminizing the inner surface of the steel pipe, laser cladding and shot peening on the inner surface. At the same time, the weldability of the material is poor due to the addition of more Cu elements. The prese...

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Abstract

The invention belongs to the technical field of casting, and mainly relates to a component design of a novel 9Cr-3W-3Co martensite heat-resistant steel material. Ni element is added in a component design process, and on the premise that the plasticity of the material is not reduced, the strength of the material is increased, and the room-temperature mechanical property of the material is improved; more trace elements such as B and N are added, so that the B element is greatly distributed on the M23C6 carbide after heat treatment, and the high-temperature endurance strength of the material is improved; a trace amount of Mo element is added, so that the effects of solid solution strengthening and precipitation strengthening are achieved; and the content requirement of Cu element is lowered, and the brittleness tendency of the Cu element is reduced.

Description

technical field [0001] The invention belongs to the technical field of casting, and mainly relates to the composition design of a novel 9Cr-3W-3Co martensitic heat-resistant steel material. Background technique [0002] Heat-resistant steel materials are mainly used as materials for key components of ultra-supercritical units in the coal power industry. The better the high-temperature resistance of such materials, the higher the steam pressure and temperature of the generator set boiler, and the higher the operating efficiency of the power station. At present, ultra-supercritical secondary reheat units with domestic parameters of 31MPa / 600°C / 620°C / 620°C still use 600°C class materials. Improved 12% Cr steel or new 12% Cr steel, such as CB2 and FB2, are generally used as materials for steam turbine rotors, high-temperature inner cylinders, diaphragms, blades and other major high-temperature components. The boiler high-temperature superheater and reheater steam headers and pi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/54C22C38/52C22C38/48C22C38/46C22C38/44C22C38/42C22C38/04C22C38/02C21D1/28C21D1/18
CPCC22C38/52C22C38/54C22C38/48C22C38/46C22C38/42C22C38/44C22C38/001C22C38/04C22C38/02C21D1/28C21D1/18C21D2211/008
Inventor 冯周荣纳学洋李永新马进晁博嗣
Owner KOCEL STEEL
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