Non-magnetic hard-section nickel austenitic stainless steel and preparation method thereof

Abstract

The invention relates to non-magnetic hard-section nickel austenitic stainless steel. The non-magnetic hard-section nickel austenitic stainless steel comprises the following chemical components by weight percentage: 0.07-0.12 percent of C, 0.2-1.0 percent of Si, 6.5-9.0 percent of Mn, 17.0-18.0 percent of Cr, 3.5-4.5 percent of Ni, 0.16-0.35 percent of N, 0.51-0.95 percent of Mo, 0.5-2.0 percent of Cu, as well as optionally one or two of 0.02-0.1 percent of V and 0.02-0.1 percent of Nb, and Fe and inevitable impurities in balancing amount. the Ni element is replaced by the C element and the N element to prepare an austenite tissue at room temperature, so that the content of the expensive Ni element can be effectively reduced, thereby reducing the cost; through the synergistic effect of Cr, Mo and N, the pitting resistance equivalent PREN of the material is ensured to be more than or equal to 18, and the corrosion resistance is improved and is equivalent to that of 304; by controlling the Md30 / 50 temperature to be lower than -35 DEG C and the lowest Md30 / 50 temperature to be -125 DEG C, after reduction of the cold rolling pressure by 0-80 percent, the yield strength of the material is 360-1590 MPa, but no Martensite phase is formed, so that the material keeps a non-magnetic characteristic, can be widely applied to electronics, apparatuses and instruments and other industries; and compared with the cost of 304 and 305, the cost of the material is obviously reduced.

Description

technical field [0001] The invention relates to a nitrogen-containing nickel-intensive austenitic stainless steel and a manufacturing method thereof, in particular to a non-magnetic hard nickel-intensive 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 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 treatment), so the material is mor...

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Problems solved by technology

For example, CN1129259A discloses a nitrogen-containing austenitic stainless steel that can save nickel and chromium. Mn and N are used to replace part of Ni, and the Ni content is significantly reduced compared with 8% in 304. However, in order to ensure that the full austenite phase is obtained at room temperature, The Cr content in the composition is also significantly reduced to 10-15%, which will result in much lower corrosion resistance than 304

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