High-strength martensitic stainless steel and manufacturing process thereof

Abstract

The invention discloses high-strength martensitic stainless steel. The high-strength martensitic stainless steel is prepared from the following components in percentage by weight: less than or equal to 0.1 percent of C, less than or equal to 0.02 percent of S, less than or equal to 0.02 percent of P, 0.1 percent to 0.5 percent of Si, 0.6 percent to 0.9 percent of Mn, 18.0 percent to 20.0 percent of Cr, 1.5 percent to 2.5 percent of Ni, 0.5 percent to 1.5 percent of Mo, 0.1 percent to 0.5 percent of Cu, 0.01 percent to 0.05 percent of V, 0.01 percent to 0.05 percent of Nb, 0.01 percent to 0.05percent of Ti, 0.001 percent to 0.1 percent of Ba, 0.1 percent to 0.15 percent of N, 0.001 percent to 0.1 percent of rear earth element RE, and the balance of Fe. The manufacturing process of the high-strength martensitic stainless steel comprises the following steps: melting, ingot-casting or ingot-casting cogging, hot-rolling, post-rolling thermal treatment and the like. A stainless alloy is high in strength and higher in corrosion resistance, is high in machining performance and is easy to form; and moreover, the stainless alloy has high CO2 and chloride corrosion resistant performance under a good high-temperature environment.

Description

technical field [0001] The invention belongs to the technical field of stainless steel alloys, and in particular relates to a high-strength martensitic stainless steel alloy and a manufacturing process thereof. Background technique [0002] With the rapid development of my country's aerospace industry, petrochemical industry, and marine resource development, these industries have increased the demand for high-performance stainless steel with excellent comprehensive properties such as high strength, high toughness, and high corrosion resistance. The high-strength martensitic precipitation-hardening stainless steel has become the material of choice for load-bearing and high-temperature and high-corrosion components such as aerospace, marine, and petrochemical industries due to its excellent strength, toughness, excellent corrosion resistance, and welding performance. [0003] As we all know, martensitic precipitation hardening stainless steel is a stainless steel composed of s...

AI Technical Summary

Problems solved by technology

However, martensitic precipitation hardening stainless steel often has many difficulties in actual production, such as unsatisfactory strength, poor intergranular corro...

Images