Novel austenitic heat-resistance stainless steel

Abstract

The invention discloses novel austenitic heat-resistance stainless steel, which belongs to the field of alloy steel. The novel austenitic heat-resistance stainless steel comprises the following components in percentage by weight: 0.04-0.08% of C, 2.05-2.80% of Si, 1.3-2.0% of Mn, less than or equal to 0.035% of P, less than or equal to 0.030% of S, 23.5-26.0% of Cr, 19.2-22.0% of Ni, 0.08% of N, 0.20-1.50% of Co, 0.10-0.20% of Mo, 0.01-1.0% of Xt and the balance of Fe and unavoidable impurities. The finished product of the austenitic heat-resistance stainless steel is prepared by mixing the raw materials, smelting in a vacuum refining furnace, performing electroslag refining, forging, performing hot rolling, annealing and performing multi-drawing, annealing and drawing. The austenitic heat-resistance stainless steel of the invention has the advantages of reasonable component design, stable manufacturing process, high high-temperature strength, adaptive plasticity and relatively high high-temperature oxidation resistance, corrosion resistance, fatigue resistance, creep resistance and impact toughness.

Description

technical field [0001] The invention belongs to the field of alloy steel, in particular to a novel austenitic heat-resistant stainless steel. It is mainly steel for structural parts that can withstand greater stress in high temperature, strong oxidation, and strong corrosion environments. Background technique [0002] In aerospace, ships, electric power, petrochemical and other fields, related components such as engines, steam boilers, steam turbines, ethylene cracking furnaces and ammonia conversion furnaces have been used in high temperature for a long time, and these components are stretched and bent under high temperature. , torsion, fatigue and impact and other loads, while also in contact with high-temperature steam, air or gas, causing high-temperature oxidation or gas corrosion on the surface. Working in high temperature environment, steel and alloy will produce atomic diffusion process, which will cause metallographic structure transformation, so this requires that...

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Problems solved by technology

Austenitic heat-resistant steel with a face-centered cubic structure, although it has high high-temperature strength at 650 ° C or higher, but because of the hard and brittle σ phase in the austenitic heat-resistant steel, the σ phase in the alloy When flakes are formed in the medium and the amount reaches 2-5%, the grain boundaries will segregate, causing embrittlement effects, and eventually lead to alloy failure and component damage

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