A non-magnetic hard austenitic stainless steel for precision electronics and its manufacturing method

Abstract

A non-magnetic hard austenitic stainless steel for precision electronics and its manufacturing method, its chemical composition weight percentage is: C 0.06-0.10%, Si 0.51-0.8%, Mn 11.5-12.5%, Cr 17.0-18.0%, Ni 2.51~3.50%, N 0.15~0.20%, Sn 0.15~0.50%, Mo 0.30~0.50%, Mo+W / 20.30~0.75%, Cu 2.0~2.5%, the rest is Fe and unavoidable impurities; at the same time, choose the following More than one element: V≤0.1%, Nb≤0.1%, and 30Sn%+5Mo%+2.5W%+Ni%+Cu%+0.5Si%‑0.25Mn%≥9.0. The present invention makes up for the adverse effects of the reduction of nickel element and the addition of manganese on the acid corrosion resistance through Cu-Mo-Sn-Si alloying, so that the material has better pitting corrosion resistance and reducing acid corrosion resistance than 304; while controlling The temperature of Md30 / 50 is lower than ‑75°C, and the austenite stability is better than 304 and 305. It ensures that when the cold working deformation of the material is ≤50%, there will be no magnetic martensitic transformation, and the hard material still maintains non-magnetic properties.

Description

technical field [0001] The invention relates to a nitrogen-containing nickel-node stainless steel for precision electronics and a manufacturing method thereof, in particular to a Cu-Mo-Sn-Si alloyed non-magnetic hard nickel-node austenitic stainless steel with excellent corrosion resistance and a manufacturing method thereof. Background technique [0002] Stainless steel hard materials are often used in electronics, instrumentation and other industries. Commonly used stainless steel hard materials are mainly S30400 (304) and S30100 (301) in 300 series austenitic stainless steel. The so-called hard stainless steel refers to quenching and tempering the stainless steel plate or steel strip, giving the steel strip a certain amount of cold rolling reduction, and without annealing after cold working, to obtain a hard stainless steel product. Hardened stainless steel is generally stronger and harder than the same material after solution treatment (or annealing), so the material is...

AI Technical Summary

Problems solved by technology

Adding more nickel to 305 will lead to an increase in material cost by more than 20%, which limits the promotion and application of materials

(2) The Ni content is low and the Mn content is high, so the corrosion resistance of the material to acidic solution is far lower than that of 304

The hard non-magnetic stainless steel used in precision electronics generally needs to be etched. At the same time, a large amount of flux is acidic during the welding process, which leads to the acidic environment of the material, so the material is prone to corrosion under acidic conditions.

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