Soft ferritic stainless steel and manufacture method thereof

Abstract

The invention discloses soft ferritic stainless steel and a method for manufacturing the same, wherein the mass percentage compositions of the stainless steel are: 0.01 to 0.03 percent by mass of C, 0.2 to 0.4 percent by mass of Mn, 0.2 to 0.4 percent by mass of Si, 15 to 17 percent of Cr, less than or equal to 0.025 percent of N, less than or equal to 0.020 percent of P, less than or equal to 0.0030 percent of S and the balance Fe and unavoidable impurities; the method comprises the following: 1) a step of smelting and continuous casting, in which molten iron and alloy material are subject to treatment by an AOD furnace and a VOD furnace, making the content of each composition with in the required range and then to continuous casting to be formed into blanks; 2) a step of heating plate blanks, in which the plate blanks are heated to between 1050 and 1100 DEG C for no less than 180 minutes; 3) a step of hot rolling, in which the finishing temperature is between 860 and 880 DEG C, the coiling temperature is 750+-20 DEG C; 4) a step of heat treatment after rolling, in which the annealing temperature is between 860 and 900 DEG C, with acid cleaning; 5) a step of cold rolling, in which the total draft is more than or equal to 70 percent; 6) a step of heat treatment after rolling, in where the annealing temperature is between 880 and 920 DEG C. The stainless steel manufactured by the invention is low in cost, moderate in flexibility and has certain anti-corrosion and wear-resistance properties.

Description

technical field [0001] The invention relates to a soft ferritic stainless steel and a manufacturing method thereof. Background technique [0002] Because ferritic stainless steel does not contain nickel or contains a small amount of nickel, its cost is much lower than that of austenitic stainless steel, and because it has excellent local corrosion resistance such as chloride stress corrosion resistance, pitting corrosion resistance and crevice corrosion resistance, It is widely used in household appliances, kitchen and bathroom, containers, manufacturing and automobile industries, etc. However, ferritic stainless steel is rarely reported on the use of commemorative coins, game coins, and handicrafts with embossed patterns. Commemorative coins are often used because of their specific meaning and requirements, and the cost of materials used is relatively high. Gold, silver, Au- Ag alloy, some commemorative coins are made of Cu-Ni alloy plated with brass or gold, and the patte...

AI Technical Summary

Problems solved by technology

Commonly used ferritic stainless steel such as 0Cr17 or 5f1Cr17, because of its high hardness is not conducive to the embossing of commemorative coins, and too soft ferritic stainless steel is too soft, and the wear resistance is not enough after embossing denaturation, which is It is necessary to design a ferritic stainless steel with low material cost and moderate hardness after production and processing by suitable methods

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