Non-magnetic hard austenitic stainless steel for precision electron and manufacturing method thereof

Abstract

The invention relates to a non-magnetic hard austenitic stainless steel for precision electron and a manufacturing method thereof. The stainless steel comprises the following chemical components by weight percent: 0.06% to 0.10% of C, 0.51% to 0.8% of Si, 11.5% to 12.5% of Mn, 17.0% to 18.0% of Cr, 2.51% to 3.50% of Ni, 0.15% to 0.20% of N, 0.15% to 0.50% of Sn, 0.30% to 0.50% of Mo, 0.30% to 0.75% of Mo and W / 2, 2.0% to 2.5% of Cu and the balance of Fe and inevitable impurities, wherein at least one of the components as follows is selected: less than or equal to 0.1% of V and less than or equal to 0.1% of Nb; and 30Sn%+5Mo%+2.5W%+Ni%+Cu%+0.5Si%-0.25Mn% is greater than or equal to 9.0. Based on the Cu-Mo-Sn-Si alloying, the adverse effect to the corrosion resistance of the stainless steel in which the Ni is reduced and the Mn is added is eliminated, so that the stainless steel has the pitting corrosion resistance superior to 304 and can be prevented from being corroded by a reducing acid. Meanwhile, the temperature of Md30 / 50 is controlled to be lower than -75 DEG C and the austenitic stability is controlled to be superior to 304 and 305, so that the magnetic martensite phase transformation is avoided when the deformation of the stainless steel in cold machining is less than or equal to 50%. Thus, the non-magnetic performance of the hard austenitic stainless steel is also maintained.

Description

technical field [0001] The invention relates to a nitrogen-containing nickel-free stainless steel for precision electronics and a manufacturing method thereof, in particular to a Cu-Mo-Sn-Si alloyed non-magnetic hard nickel-free 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 the 300 series austenitic stainless steel. The so-called hard stainless steel refers to quenching and tempering rolling of stainless steel plate or steel strip, giving the steel strip a certain amount of cold rolling reduction, no annealing treatment after cold working, and obtaining hard stainless steel products. Hardened stainless steel is generally stronger and harder than the same material after solution treatment (or annealing), so ...

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.

Images