Precipitation hardening type stainless steel with high density

Abstract

This invention discloses a precipitation-hardening stainless steel with high density. The stainless steel comprises: C 0.01-0.09 wt.%, Si 0.2-0.6 wt.%, Mn 0.05-0.5 wt.%, P 0.0001-0.03 wt.%, S 0.0001-0.03 wt.%, Cr 11-14 wt.%, Ni 4-7 wt.%, Cu 1.5-2.5 wt.%, Nb 0.01-0.1 wt.%, W 8-12 wt.%, and Fe as balance. The density is 8.1-8.4 g / cm3. The stainless steel has such advantages as high density (specific gravity), high corrosion resistance, high moldability, and high weldability, and can be used to manufacture equipments and components.

Description

technical field [0001] The invention relates to an alloy material, in particular to a precipitation hardening stainless steel with relatively high density. Background technique [0002] Stainless steel generally refers to an alloy whose main component is iron with a chromium content of more than 10.5%. This material not only has good mechanical strength, but also is beautiful and corrosion-resistant, so it is widely used in various fields of industry. There are many kinds of stainless steel, which can be divided into five categories according to the metallographic structure (ie microstructure) after heat treatment: ferritic stainless steel, martensitic stainless steel, austenitic stainless steel, austenitic-ferritic stainless steel and precipitation Hardened stainless steel, among which precipitation hardened stainless steel is also divided into three categories according to its structure: precipitation hardened semi-austenitic type, precipitation hardened martensitic type a...

AI Technical Summary

Problems solved by technology

However, in some occasions that require relatively high density (specific gravity) materials, such as inertial motion and stable balance requirements (such as driving flywheel discs, machine bases or chassis, sports equipment, etc.), the whole or part of the mechanism and parts adopts existing materials. For some precipitation hardening stainless steels, the density (specific gravity) of the material itself is not enough. If in order to increase the density (specific gravity) of the material, simply add high-density (specific gravity) elements in the refining process of the alloy material, and it is easy Gravity segregation occurs, resulting in uneven material interior

In addition, although the overall density (specific gravity) of the material is increased in this way, the strength of the material decreases instead, and it causes disadvantages such as poor corrosion resistance and decreased welding strength.

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