High-performance B-containing martensite heat-resistant steel material for high-parameter gas turbine wheel disc and preparation method thereof

By optimizing the chemical composition and heat treatment process of high-performance B-containing heat-resistant steel materials, the problem of insufficient long-lasting strength of existing materials in high-parameter gas turbine turbine roulettes is solved, and high-strength performance improvement is achieved under 500℃, meeting the design requirements of the gas turbine roulettes.

CN119753502APending Publication Date: 2025-04-04CHINA UNITED GAS TURBINE TECH CO LTD +1
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Patent Information

Application Number
CN202411936773.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-26
Publication Date
2025-04-04

AI Technical Summary

Technical Problem

The existing 10% Cr heat-resistant steel material containing W has problems of insufficient long-lasting strength and small safety margin in the turbine roulette of high-parameter gas turbine, which is difficult to meet the design requirements.

Method used

High-performance B-containing martensite heat-resistant steel material is used to improve the strength and heat resistance of the material by reasonably controlling the composition of chemical elements and heat treatment process, including the optimization of the content of C, Cr, Mo, N, B and other elements and the phase transition temperature, and prepare the performance requirements of high-parameter gas turbine roulettes.

Benefits of technology

Under 500℃, the long-lasting strength of high-performance B-containing heat-resistant steel materials is significantly improved, meeting the design requirements of high-parameter gas turbines, and laying the foundation for the localization of high-parameter gas turbine roulettes.

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Abstract

The invention relates to the technical field of gas turbine materials, in particular to a high-performance B-containing martensite heat-resistant steel material for a high-parameter gas turbine wheel disc and a preparation method thereof. The high-performance martensite heat-resistant steel material containing B comprises the following chemical elements in percentage by weight: 0.18-0.21 wt% of C; mn is 0.10 to 0.30 wt%; the weight percentage of Cr is 8.95 to 9.50 percent by weight; 0.25 to 0.45 wt% of N ; 1.40 to 1.60 wt% of Mo; the content of V is 0.27 to 0.40 percent by weight; 1.08 to 1.32 wt% of Co; 0.04 to 0.06 wt% of Nb; b is 0.004 to 0.007 weight percent; n is 0.020 to 0.045 wt%; and the balance of iron and inevitable impurities. The performance of the high-performance B-containing martensite heat-resistant steel material meets the design requirements of turbine wheel discs, and the endurance strength and margin are higher under the condition of 500 DEG C.
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