High-temperature oxidation-resistant austenitic heat-resistant stainless steel and its preparation method and use

Abstract

The invention provides an austenitic heat-resistant stainless steel resistant to high temperature oxidation, which comprises: C 0.04‑0.1%, Cr 14‑17%, Ni 20‑27%, Al 2‑4%, Nb 0.2‑ 2.5%, W 0.5‑5%, Cu 1.5‑4%, Mn 0.5‑1%, S<0.005%, P<0.02%, N<0.02%, and the balance Fe. The present invention also provides a preparation method of austenitic heat-resistant stainless steel, comprising: (1) heating and keeping the cast slab warm, forging it into a billet, and then air cooling; (2) removing the scale on the surface of the billet, heating and keeping it warm, followed by hot rolling. The high-temperature oxidation-resistant austenitic heat-resistant stainless steel of the invention has excellent high-temperature tensile properties, durable creep properties and steam corrosion resistance, and can meet the manufacturing requirements of ultra-supercritical generator sets.

Description

technical field

[0001] The invention belongs to the field of metallurgy. Specifically, the invention relates to a high-temperature oxidation-resistant austenitic heat-resistant stainless steel, a preparation method and application thereof. Background technique

[0002] my country's energy structure has long been dominated by thermal power generation. Realizing the transformation of power generation mode to high-parameter and large-capacity units is one of the important measures to improve power generation efficiency and improve environmental pollution. High steam parameters put forward higher and more comprehensive requirements on the performance of heat-resistant materials, including: sufficient durable strength and creep rupture strength, excellent fatigue resistance and heat transfer performance, high oxidation resistance and corrosion resistance, good long-term stability of the organization. At present, the materials used for key parts of ultra-supercritical thermal pow...

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