Rare-earth-type 0Cr17Ni4Cu4Nb martensitic precipitation-hardening stainless steel and preparation method thereof

Abstract

The invention discloses rare-earth-type 0Cr17Ni4Cu4Nb martensitic precipitation-hardening stainless steel. The rare-earth-type 0Cr17Ni4Cu4Nb martensitic precipitation-hardening stainless steel is characterized by comprising the following chemical components in percentage by weight: less than or equal to 0.07% of C, less than or equal to 1% of Si, less than or equal to 1% of Mn, less than or equal to 0.035% of P, less than or equal to 0.03% of S, 3.00-5.00% of Ni, 15.5-17.5% of Cr, 3.00-5.00% of Cu, 0.15-0.45% of Nb, 0.05-0.25% of Re and the balance of Fe and belongs to the field of alloy steels. The invention also discloses a preparation method of the rare-earth-type 0Cr17Ni4Cu4Nb martensitic precipitation-hardening stainless steel. The preparation method comprises the steps of smelting, casting, carrying out electroslag remelting, casting ingots, forging or rolling, carrying out solution treatment and the like. The rare-earth-type 0Cr17Ni4Cu4Nb special steel, which is disclosed by the invention, as one of precipitation-hardening martensitic stainless steel, has the characteristics of high strength, high hardness, corrosion resistance and the like and is suitable for various technical fields, such as chemical machinery, food machinery, papermaking machinery, aerospace and marine.

Description

technical field [0001] The invention relates to a chromium stainless steel, in particular to a 0Cr17Ni4Cu4Nb martensitic precipitation hardening stainless steel and a preparation method thereof, belonging to the field of alloy steel. Background technique [0002] In recent years, my country's technical equipment has been continuously improved, and the application and demand for special stainless steel are increasing. However, in some special industrial fields, due to the extremely high requirements on the comprehensive performance of steel, typical single-phase stainless steel is difficult to meet their needs. Typical 0Cr18Ni9 austenitic stainless steel has excellent welding performance and pressure processing performance, but does not have the high strength of martensitic chromium stainless steel. [0003] Typical 0Cr17Ni4Cu4Nb stainless steel is a high-strength precipitation-hardening martensitic stainless steel, which has excellent corrosion resistance after special treat...

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Problems solved by technology

At the same time, the present invention also aims at the problem that the addition of rare earths in the prior art may easily cause secondary oxidation and burning loss, and provides a preparation process for preparing the rare earth type 0Cr17Ni4Cu4Nb stainless steel of the present invention by adding rare earths

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