Soft austenitic stainless steel and preparation method thereof

Abstract

The invention relates to a soft austenitic stainless steel which comprises the following components by weight: less than or equal to 0.025% of C, less than or equal to 0.020% of N, more than or equal to 6C of Ti, 10.00-12.00% of Ni, 18.00-19.00% of Cr, less than or equal to 2% of Mn, less than or equal to 0.40% of Si, less than or equal to 0.015% of S, less than or equal to 0.045% of P, and the balance of Fe and inevitable impurities. The high-temperature ferrite delta content of the austenitic stainless steel is less than 5%. The invention also relates to a preparation method of the soft austenitic stainless steel. The preparation method comprises the following steps of: skimming slags after completing the reduction at a refining station; after skimming slags, adding lime and fluorite in each ton of liquid steel, and performing slagging at least twice, with the N content being controlled within the range of 0.015-0.025%; after two slaggings, adding TiFe powder into each ton of liquid steel till tapping ladle; after tapping, adding low-carbon synthetic slag so as to perform a slag exchanging operation and further absorb TiN impurities; when the liquid steel reaches an LF (ladle furnace) refining furnace for refining, adding a certain quantity of TiFe wires, thereby causing Ti to be more than or equal to 6C; and casting after stirring, wherein the nitrogen content of an end product after being cast is less than or equal to 0.020%. The soft austenitic stainless steel provided by the invention is applied to the field with higher demand on forming property and corrosion resistance.

Description

technical field [0001] The invention relates to a stainless steel, in particular to a soft austenitic stainless steel and a preparation method thereof, which can effectively control the nitrogen content. The stainless steel has excellent formability and good corrosion resistance. In addition to replacing existing materials, it can also be used in fields that require high formability of materials, especially multi-pass forming. Background technique [0002] 18-8 series austenitic stainless steel, such as SUS304 and SUS304L, have good corrosion resistance, mechanical properties, formability and welding performance at high and low temperatures, and are widely used in chemical industry, energy, construction machinery, kitchen utensils, products, etc. each field. Because it is a metastable austenitic structure, martensite will be produced during processing and deformation, so that the strength can be improved by cold work hardening, which is also one of the advantages of this ty...

AI Technical Summary

Problems solved by technology

However, its deep processing performance and corrosion resistance still need further improvement.

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