Nickel saving type metastable austenite stainless steel with excellent normal temperature mechanical property

Abstract

The invention provides a nickel saving type metastable austenite stainless steel with excellent normal temperature mechanical property. The stainless steel comprises the following chemical components by weight percentage: 0.06 to 0.15 percent of C, less than 1.00 percent of Si, 7.00 to 10.00 percent of Mn, 15.0 to 17.0 percent of Cr, 1.50 to 2.50 percent of Ni, 0.15 to 0.30 percent of N, less than 0.030 percent of P, less than 0.020 percent of s, and the balance of Fe and inevitable impurities. In different states, the normal temperature yield strength of the raw material is 400 to 1,370 MPa, and the normal temperature tensile strength is 860 to 1,700 MPa, and the normal temperature expansion rate is 15 to 65 percent. The metastable austenite stainless steel of the invention is better than AISI304 in the normal temperature mechanical property, and has certain corrosion resistance, but the cost is obviously lower than that of the AISI304; the stainless steel can partially replace the AISI304 to be used in weak corrosive environments such as traffic, construction, hardware, and the like. The prepared precise strip steel can partially replace the metastable austenite stainless steel of the AISI301, AISI201, and the like which contains higher nickel, so that the precious metal nickel is saved.

Description

technical field [0001] The invention relates to austenitic stainless steel, in particular to a nickel-saving metastable austenitic stainless steel with excellent mechanical properties at room temperature. Background technique [0002] Metastable austenitic stainless steel is represented by AISI304, AISI301 and AISI201, which is a single-phase austenite structure at room temperature after solution treatment, and strain-induced martensite or temperature-dropped martensite will be produced after processing or cooling. Body stainless steel. [0003] At present, the austenitic stainless steels widely used at home and abroad are mainly 300 series and 200 series, such as AISI304 and AISI201 and other austenitic stainless steels. These austenitic stainless steels contain more nickel, and the addition of a large amount of nickel leads to these Raw material cost of austenitic stainless steel increases. Due to the lack of nickel and chromium in our country, nickel and chromium resour...

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Problems solved by technology

[0010] In Table 1, Japanese patents JP54,038,217, JP52,024,914, Chinese patents CN1240839A, CN1704497A, and CN1213013A describe the chemical composition of a nickel-saving metastable austenitic stainless steel, but these chemical compositions all contain copper, copper-containing stainless steel Has the disadvantage of being difficult to recycle

[0011] The chemical composition of the austenitic stainless steel disclosed in Chinese patent CN1584098A is: carbon ≤ 0.10%, silicon ≤ 0.80%, manganese: 8.50-10.00%, nickel ≤ 1.20%, chromium: 14.0-15.0%; nitrogen ≤ 0.20%, phosphorus ≤ 0.050%, sulfur≤0.030%, and the balance is iron. The chromium content of the stainless steel of this invention is lower than 15.0%, which is unfavorable to the stainless steel and corrosion resistance of stainless steel, and copper is contained in the embodiment

[0012] Japanese patent JP2001131713 stainless steel contains titanium, vanadium, niobium and other elements, and the nickel content is 4.00-10.00%, the cost of raw materials is high

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