Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Patent
1997-07-29
1999-01-12
Yee, Deborah
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
148611, 148327, C22C 3840, C21D 802
Patent
active
058581359
ABSTRACT:
A method for producing strip cast, austenitic stainless steel strip comprises providing a strip cast strip having an initial microstructure including a detrimental amount of delta ferrite and a detrimental amount of dendritic structure is provided. The strip may have a composition comprising the following ingredients: 0.4 wt. % max. carbon, 5-38 wt. % nickel, and 15-28 wt. % chromium. The strip is subjected to a cold rolling step prior to any annealing step. Upon subsequent annealing, (a) the amount of delta ferrite in the strip is reduced to substantially below the detrimental amount of delta ferrite that was in the strip prior to cold rolling and (b) the amount of dendritic structure in the strip is reduced to below the detrimental amount of dendritic structure that was in the strip prior to cold rolling. By employing the method of the present invention, an austenitic stainless steel strip having a high quality surface is produced. After cold rolling and annealing, the microstructure of the strip may comprise austenitic and less than about 10% delta ferrite by volume.
REFERENCES:
patent: 5030296 (1991-07-01), Ueda et al.
patent: 5188681 (1993-02-01), Teraoka et al.
patent: 5492575 (1996-02-01), Teraoka et al.
Zygo Corporation, Laurel Brook Rd., Middlefield, CT 06455, "New View 100 Operation Manual OMP-0348B," pp. 1-1 to 3-16 and Appendix A (Dec., 1993).
Zygo Corporation, Laurel Brook Rd., Middlefield, CT 06455, "MetroPro Surface Texture Parameters," pp. 1-9 (1996).
Blazek Kenneth E.
Niemczura Zofia E.
Inland Steel Company
Yee Deborah
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