Ab sandvik steel, sweden has launched two new grades of stainless steel spring wire that are marketed by sandvik asia. The first new grade, designated sandvik saf 2205, is a duplex stainless steel, which has good corrosion resistance, superior to that of a standard stainless aisi 316. Laboratory tests, with aqueous solutions containing hydrogen sulphide and chlorides, have shown that saf 2205 possesses particularly good resistance to stress corrosion cracking. Tests have also shown that saf 2205 is usable at considerably higher temperatures and chloride contents than aisi 302/304 and 316 stainless steels, without pitting. Additionally, the grade provides high tensile and fatigue strength and good relaxation resistance at elevated temperatures. The service temperature is ranging from 100°c to 300°c. It finds applications in corrosive environments, the automotive industry and for aerosols. The other specially developed grade is sandvik 13rm19. - it is non-magnetic, stainless spring steel, which combines high mechanical strength with a non-magnetic structure. It is completely non-magnetic in all conditions and thus has a combination of properties, which have previously only been found in expensive cobalt/nickel base or copper/beryllium alloys. It also possesses good fatigue properties and excellent ductility that makes it an ideal choice of material for springs and other high strength applications where ferro-magnetic steels are not suitable. User area includes components for the electronics, computing and instrumentation industries.
