Fe-Ni alloy cold-rolled sheet excellent in cleanliness and etchi

Details Fe-Ni alloy cold-rolled sheet excellent in cleanliness and etchi Fe-Ni alloy cold-rolled sheet excellent in cleanliness and etchi

1994-05-23

1995-02-21

Dean, Richard O.

Metal treatment

Stock

Ferrous

148310, 148546, 420 94, C22C 3808

Patent

active

053912411

ABSTRACT:
An Fe--Ni alloy cold-rolled sheet excellent in cleanliness and etching pierceability prepared as specified in the claims, which consists essentially of: 30 to 45 wt. % nickel, 0.1 to 1 wt. % manganese, 0.003 to 0.03 wt. % aluminum and the balance being iron and incidental impurities comprising up to 0.4 wt. % silicon, up to 0.1 wt. % chromium, up to 0.005 wt. % carbon, up to 0.005 wt. % nitrogen, up to 0.005 wt. % sulfur, up to 0.010 wt. % phosphorus, up to 0.002 wt. % oxygen, and up to 0.002 wt. % as converted into oxygen for non-metallic inclusions. The non-metallic inclusions contain at least CaO, Al.sub.2 O.sub.3 and MgO, and the composition thereof is in a region of a melting point of at least 1,600.degree. C., which region is defined by the liquidus curve of 1,600.degree. C. in the CaO--Al.sub.2 O.sub.3 --MgO ternary phase diagram. The non-metallic inclusions have a particle size of up to 6 .mu.m.

REFERENCES:
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patent: 5002619 (1991-03-01), Tsuda et al.
Patent Abstracts of Japan, vol. 10, No. 131 (C-346) (2188) May 15, 1986 of JP-A-60-255 953 (Sumitomo Tokushiyu Kinzoku K.K.) Dec. 17, 1985.
Patent Abstracts of Japan, vol. 10, No. 182 (C-356) (2238) Jun. 25, 1986 of JP-A-62-030 646 (Daido Steel Co. Ltd.) Feb. 12, 1986.
Patent Abstracts of Japan, vol. 11, No. 3 (C-395) (2450) Jan. 7, 1987 of JP-A-61-179 849 (Daido Steel Co. Ltd.) Aug. 12, 1986.
Patent Abstracts of Japan, vol. 10, No. 203 (C-360) (2259) Jul. 16, 1986 of JP-A-61-044 156 (Nippon Mining Co. Ltd.) Mar. 3, 1986.

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