High-temperature heat-resistant and corrosion-resistant stainless steel and manufacturing method thereof

Abstract

The invention discloses a high-temperature heat-resistant and corrosion-resistant stainless steel and a manufacturing method of the stainless steel. The stainless steel comprises the following chemical compositions by weight: less than 0.08% of C, less than 1.50% of Si, less than 2.00% of Mn, less than 0.045% of P, less than 0.03% of S, 24.0%-26.0% of Cr, 19.0%-22.0% of Ni, 0.5%-1.0% of Nb, less than 0.003% of B, less than 0.01% of La or Re, and the balance of Fe and inevitable impurity elements. The preferential smelting procedures are as follows: conducting vacuum induction melting firstly, then conducting vacuum arc remelting or electroslag remelting, conducting hot processing formation and then conducting solid-solution treatment and ageing treatment.

Description

technical field [0001] The invention relates to a high-temperature, heat-resistant and corrosion-resistant stainless steel, which has good high-temperature strength, plasticity, high-temperature structure stability, toughness, and a combination of oxidation / sulfurization / hydrogenation / carbonization resistance, and can be applied to large-scale electric power, petrochemical, and environmental protection equipment The materials used in and the flat parts in high temperature oxidation / sulfurization / hydrogenation / carbonization environment are nickel-based alloys that can be cast and welded, and belong to the field of material engineering technology. Background technique [0002] Compared with ordinary stainless steel (18-8 series, martensitic stainless steel, ferritic stainless steel, etc.), high-temperature heat-resistant and corrosion-resistant stainless steel has absolute advantages in many complex corrosive environments and high temperature conditions, and is widely used in e...

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Problems solved by technology

[0006] In order to meet the new strength, temperature and corrosion resistance requirements in complex atmospheres, the original stainless steel and some age hardening alloys that have been used in other fields so far cannot meet high temperature strength, maximum service temperature and phase stability, oxidation resistance / Vulcanization / Hydrogenation / Carbonation Performance Requirements

For example, in a typical age-hardening nickel-based alloy, the Cr content of the alloy must be increased to enhance the anti-sulfurization performance, but increasing the Cr content is not only not conducive to the strengthening of the alloy, but also leads to the precipitation of brittle σ phase and μ phase in the alloy if it is added too much Or α-Cr phase formation, increasing the risk of alloy embrittlement

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