Stainless steels

Details Stainless steels Stainless steels

2001-07-23

2003-10-14

Yee, Deborah (Department: 1742)

Alloys or metallic compositions

Ferrous

Nine percent or more chromium containing

C148S327000

Reexamination Certificate

active

06632395

ABSTRACT:

This invention relates to a high-strength, austenitic, stainless steel, and to methods of its production.
There is great use of austenitic stainless steels, especially in the petrochemical industry where their properties are essential. Ideal properties include high corrosion and pitting resistance, good weldability and elongation, good low-temperature impact resistance, high proof strength and high tensile strength.
These ideal metallurgical properties can be summarised as follows:
(a) PREN(=%Cr+3.3Mo+16 N)>50
(b) 0.2% proof strength=>400 N/mm
2
(c) critical pitting temperature >70° C.
(d) good weldability.
Such steels have been the object of much attention and research. Many attempts have been made to achieve all the properties listed but up to this time it was widely believed that they were basically incompatible, especially in the cast form, and could only be achieved to some acceptable degree in the wrought form.


REFERENCES:
patent: 4371394 (1983-02-01), Henthorne et al.
patent: 0 342 574 (1989-11-01), None
patent: 0 507 229 (1992-10-01), None
patent: 833 308 (1960-04-01), None
patent: 1 091 849 (1967-11-01), None
“Metals & Alloys in the Unified Numbering System, 7thEdition,” 1996, p. 270, Society of Automotive Engineering,Steel S34565.
C.R. Taylor et al., “Electric Furnace Steelmaking,” 1985, pp. 143-148, 157-159, Iron & Steel Society.
H.E. McGannon, “The Making, Shaping and Treating of Steel,” 1971,p. 256, United States Steel.
N. Arlt et al., “Welding Characteristics and Corrosion Resistance of the New Nitrogen-Alloyed Steel X 2 CrNiMnMoN 24 17 6 4,”Welding International, Jan. 1, 1994, pp. 804-807, vol. 8, No. 10, Welding Institute, Abington, Great Britain.
C. Gillessen et al., “Development, Properties and Application of Conventionally Produced High-Nitrogen Austenitic Steels,” 1991, pp. 412-420,vol. 62, No. 9, Steel Research.
R.Grundmann et al., “Properties of the newly developed steel X 2 CrNiMnMoN 23 17 6 4,” 1990, pp. 19-24, vol. 41, No. 1, Werkstoffe und Korrosion.
M. Liljas, “Development of Superaustenitic Stainless Steels,”Welding in the WorldJun. 1, 1995, pp. 55-63, vol. 36, International Institute of Welding.

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