Alloys or metallic compositions – Ferrous – Eight percent or more manganese containing
Patent
1998-02-18
1999-06-08
Yee, Deborah
Alloys or metallic compositions
Ferrous
Eight percent or more manganese containing
420 74, 420 73, 420 75, C22C 3804, C22C 3806
Patent
active
059102853
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to an Al--Mn--Si--N austenitic stainless acid-resisting steel, which can be used to substitute for conventional 18-8 type austenitic stainless steel.
BACKGROUND OF THE INVENTION
18-8 type austenitic stainless steel, such as 1Cr18Ni9, 1Cr18Ni9Ti and 0Cr18Ni9 belongs to conventional austenitic stainless steel. It has found a extensive and long-term application in the industry because of its superior corrosion resistance, combined mechanical properties and processing property. However, because it contains a large amount of expensive Cr and Ni, the price of the steel is very high, thereby limiting its application in a broader field. Furthermore, because both Cr and Ni are scarce in the earth, it is a long-term goal of metallurgical field to develop an austenitic stainless steel containing little or no Cr, Ni so as to substitute for 18-8 type Cr-Ni austenitic stainless steel. Up to now, however, it has not been reported that a stainless steel without Cr and Ni can provide corrosion resistance, combined mechanical properties and processing property equivalent to that by conventional 18-8 type Cr-Ni austenitic stainless steel.
It is a main object of the invention to provide an Al--Mn--Si--N austenitic stainless acid-resisting steel.
It is another object of the invention to provide an Al--Mn--Si--N austenitic stainless acid-resisting steel which can improve corrosion resistance, especially in sulfinic acid or a reductive medium.
It is again another object of the invention to provide an Al--Mn--Si--N austenitic stainless acid-resisting steel which is in particularly resistant to intergranular-corrosion.
It is a further object of the invention to provide an Al--Mn--Si--N austenitic stainless acid-resisting steel which has an improved toughness at a low temperature, especially at the temperature of -120.degree. C.
It is a further object of the invention to provide an Al--Mn--Si--N austenitic stainless acid-resisting steel which has an improved corrosion resistance in hydrochoric acid, diluted sulfuric acid, basic solution and seawater.
It is a further object of the invention to provide an Al--Mn--Si--N austenitic stainless acid-resisting steel which has an improved resistances to oxidation, heat fatigue and hot corrosion.
It is a further object of the invention to provide an Al--Mn--Si--N austenitic stainless acid-resisting steel which has an improved resistances to wear and high temperature.
SUMMARY OF THE INVENTION
The technical solution of the invention is achieved as follows (all contents hereafter are percentage by weight of the steel, unless otherwise specified):
An Al--Mn--Si--N austenitic stainless acid-resisting steel according to one embodiment of the invention comprises the following elements: 0.06-0.12 C, 4-5 Al, 16-18 Mn, 1.2-1.5 Si, 0.15-0.3 N, 0.1-0.2 rare metal(s), the balance Fe and unavoidable impurities.
An Al--Mn--Si--N austenitic stainless acid-resisting steel resistant to intergranular-corrosion according to another embodiment of the invention contains 0.06-0.12 C, 4-Al, 16-18 Mn, 1.2-1.5 Si, 0.15-0.3 N. 0.1-0.2 rare metal(s), 1-3 Ti, the balance Fe and unavoidable impurities.
An Al--Mn--Si--N austenitic stainless acid-resisting steel resistant to intergranular-corrosion according to one embodiment of the invention contains 0.06-0.12 C, 4-5 Al, 16-18 Mn, 1.2-1.5 Si, 0.15-0.3 N, 0.1-0.2 rare metal(s), 1-3 Nb, the balance Fe and unavoidable impurities.
An Al--Mn--Si--N austenitic stainless acid-resisting steel resistant to intergranular-corrosion according to one embodiment of the invention contains 0.06-0.12 C, 4-5 Al, 16-18 Mn, 1.2-5 Si, 0.15-0.3 N. 0.1-0.2 rare metal(s), 1-3 Ti, 1-3 Nb, the balance Fe and unavoidable impurities.
An Al--Mn--Si--N austenitic stainless acid-resisting steel according to one embodiment of the invention, which has an improved toughness at a low temperature, especially at -120.degree. C., contains 0.06-0.12 C, 4-5 Al, 16-18 Mn, 1.2-1.5 Si, 0.15-0.3 N, 0.1-0.2 rare metal(s), 2-4 Ni, the balance Fe and unavoidable impurities.
REFERENCES:
patent: 3690870 (1972-09-01), Williams
patent: 4875933 (1989-10-01), Wan
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