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Novel nitride-reinforced martensite heat-resisting steel

A martensitic and heat-resistant steel technology, applied in the field of iron-based heat-resistant steel, can solve the problems of poor high temperature resistance structure stability, and achieve the effect of high structure stability and good high temperature mechanical properties

Inactive Publication Date: 2012-10-31
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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Problems solved by technology

[0008] The purpose of the present invention is to provide a new type of nitride-strengthened martensitic heat-resistant steel to solve the problem of poor stability of the high-temperature resistant structure of the previous martensitic heat-resistant steel

Method used

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  • Novel nitride-reinforced martensite heat-resisting steel

Examples

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Effect test

Embodiment 6

[0044] The martensitic heat-resistant steel in embodiment 1~embodiment 5 is carried out the test of martensitic structure performance:

Embodiment 1

[0045] In Example 1, the Mn content in the martensitic heat-resistant steel does not increase, and is maintained at 0.5%, and its structure is as follows Figure 4 As shown, it can be seen that after the carbon content is reduced, if the Mn content is not increased, δ ferrite will be formed.

Embodiment 2

[0046] The microstructure of martensitic heat-resistant steel in embodiment 2 is as follows Figure 5 As shown, it can be seen that after the carbon content is reduced, increasing the Mn content to 0.8% can inhibit the delta ferrite and obtain the entire martensite structure.

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Abstract

The invention provides a novel nitride-reinforced martensite heat-resisting steel. The steel is characterized in that main alloy components of the martensite heat-resisting steel comprises, by weight, 0.8-1.5% of Mn; 8.0-10.0% of Cr; no more than 1.5% of W; no more than 1.5% of Mo (wherein wherein the sum of the weight percentages of W and Mo is 1.5-2.0%); no more than 0.06% of Nb; no more than 0.15% of Ta (wherein Nb+Ta accounts for 0.05-0.15%); 0.1-0.3% of V; 0.03-0.05% of N; and balance of Fe. According to the invention, the content of the element Mn is increased. On a basis that a phase change point of a material AC1 is almost not reduced, heat-resisting steel original martensite tissues reinforced by high-thermal-stability nitride precipitate is obtained. With the controlling over the contents of elements Co, W, Mo, N, and the like, Laves phase and Z phase precipitation of steel during long-term high-temperature service can be retarded. Therefore, the obtained steel has relatively high tissue stability and good high-temperature mechanical properties.

Description

technical field [0001] The invention relates to the technical field of iron-based heat-resistant steel, and in particular provides a novel nitride-strengthened martensitic heat-resistant steel. Background technique [0002] Improving steam parameters and developing supercritical and ultra-supercritical power generation technologies are effective measures to improve coal-fired power generation efficiency and reduce carbon emissions, and have been vigorously developed around the world. With the increase of steam parameters, more stringent requirements are put forward for the heat-resistant structural materials of its key components (such as the main steam pipeline). At present, advanced ferritic / martensitic heat-resistant steels for power stations mainly include T / P91, T / P92, P122, etc. [0003] Foreign countries have carried out high-temperature and long-term experimental research on advanced ferritic / martensitic heat-resistant steels (such as T / P91, T / P92, P122, etc.), such...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/24C22C38/26C22C38/46C22C38/48C22C38/50C22C38/52
Inventor 严伟邓利芬胡平王威单以银杨柯
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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