Free-machining ferritic stainless steel for ferromagnetic component

Abstract

The invention provides an easy-cutting ferritic stainless steel used for a ferromagnetic part. The ferritic stainless steel comprises the following chemical composition: less than or equal to 0.03wt% of C, 0.6-1.2wt% of Si, less than or equal to 0.30wt% of Mn, 13.0-20.0wt% of Cr, less than or equal to 0.5wt% of Ni, 0.12-0.3wt% of S, 0.3-0.6wt% of V, 0.01-0.40wt% of Cu, less than or equal to 0.03wt% of P, and the balance Fe and impurities. The ferritic stainless steel of the invention is prepared by adjusting the contents of Si, Cr and S, adding V of proper amount and adopting reasonable manufacturing technique; the ferritic stainless steel has good corrosion resisting property and cutting property, with a magnetic property index coercive force Hc being less than or equal to 94.8A / m.

Description

technical field [0001] The present invention relates to ferritic stainless steel, and in particular, the present invention relates to a free-machining ferritic stainless steel for ferromagnetic parts. Background technique [0002] Stainless steel is a common alloy steel. According to the metallographic structure, it can be generally divided into: ferritic stainless steel, austenitic stainless steel, martensitic stainless steel and duplex stainless steel (ferritic-austenitic stainless steel). [0003] Ferritic stainless steel used for ferromagnetic parts is a kind of Fe-Cr-Me ferritic stainless steel, which is an important type of soft magnetic material, and is generally used in the manufacture of solenoid valves, inductors, etc. The shape of ferromagnetic parts of some such alloys is relatively complex and needs to be processed by machining. Therefore, ferritic stainless steel used for ferromagnetic parts should have excellent magnetic properties, corrosion resistance and ma...

AI Technical Summary

Problems solved by technology

[0006] In recent years, a series of sulfur-added free-cutting electromagnet ferritic stainless steels have been developed, such as Fe-Cr-Me ferritic stainless steel with application number 02152827.6, which is a kind of free-cutting ferritic stainless steel that can be used for ferromagnetic parts ( The composition is shown in Table 1), although this alloy has excellent cutting performance, but the coercive force Hc is relatively large (coercive force is the main indicator of the magnetic properties of ferritic stainless steel used for ferromagnetic parts), and its Hc≥110A / m, cannot meet the requirements of some users, because when used to manufacture solenoid valves, if the coercive force of the material is relatively large, the AC loss is also large, and the solenoid valve is prone to heat generation after long-term use, and a certain amount of residual magnetism will also be generated , when the power supply is cut off, since the solenoid valve core has a certain residual magnetism, the starting current will be large, which is unfavorable for applications in aerospace, aviation and other fields