Newer Types of Stainless Steel and Their Application to Photographic Processing Equipment

Within the past three years, two new types of stainless steel have been developed: (1) type 315 which contains approximately 18% chromium, 8% nickel, 1.5% copper, and 1.5% molybdenum: and (2) a modification of type 316 (the usual 18–8 S Mo) where the molybdenum content has been raised to from 3 to 4% molybdenum. Considerable test data are now available for type 329, containing approximately 27% chromium, 4.5% nickel, and 1.5% molybdenum. The latter steel shows promise in that pit-corrosion tendency is considerably reduced. Satisfactory welds may also be made with this type. From the corrosion-resisting standpoint, three other compositions are discussed: type 309, 24% chromium, 13% nickel; type 310, 25% chromium, 20% nickel; and type 446, 27% chromium. — It is pointed out that a polished (No. 6) and a finely ground (No. 4) finish are more corrosion-resistant than a pickled finish, not only from the potential standpoint but due to the decreased possibility of their collecting foreign matter that will accelerate corrosive attack.

Print ISSN

0097-5834

Published

1938-04

Content type

Original Research

DOI

10.5594/J16599