Duplex stainless steel with special magnetic property

Abstract

The invention provides a duplex stainless steel with special magnetic property, which comprises the following chemical compositions in percentage by weight: less than or equal to 0.12 percent of C+N, less than or equal to 1.0 percent of Si, 2.0 to 6.0 percent of Mn, less than or equal to 0.04 percent of P, less than or equal to 0.01 percent of S, 3.0 to 7.0 percent of Ni, 22.0 to 27.0 percent of Cr, less than or equal to 2.0 percent of Cu, less than or equal to 2.0 percent of Mo, less than or equal to 2.0 percent of W, less than 0.1 percent of Ce or less than 0.006 percent of B, and the balance of Fe and inevitable impurities, wherein the equivalent ratio of Cr to Ni (Creq / Nieq) is between 3.1 and 3.8. Under the control of the chemical compositions, ferrite volume content of materials in the state of cold rolling and anneal is between 68 and 85 percent, while the saturation magnetic induction density is between 0.72 and 1.0 T. The duplex stainless steel has good hot forming property, low hardness, good plasticity and anti-counterfeiting property, and is suitable for coining.

Description

technical field [0001] The invention relates to stainless steel materials, in particular, the invention relates to a duplex stainless steel with special magnetic properties. Background technique [0002] With the improvement of people's living standards and aesthetic concepts, entertainment, commerce and other industries are becoming more and more prosperous, and the performance requirements for coins used in entertainment, commerce and other facilities are constantly improving, and stainless steel coins have emerged as the times require. Stainless steel is more and more recognized and loved by the market because of its lower cost, anti-corrosion and wear resistance, good processing performance and surface gloss. In many countries and regions, stainless steel has long been used as a material for making coins such as game machines. The commonly used stainless steels include 430 ferritic stainless steel and 304 austenitic stainless steel. [0003] However, there is a problem ...

AI Technical Summary

Problems solved by technology

Since the material used for coinage requires low hardness and good plasticity, it should generally meet the requirements of hardness HV≤220 and elongation ≥20%. However, in the past, the alloy composition in duplex stainless steel was high, especially the high content of C and N, resulting in The hardness of stainless steel is too high, its hardness > 220, not suitable for coinage

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