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The SAE steel grades system is a standard alloy numbering system (SAE J1086 – Numbering Metals and Alloys) for steel grades maintained by SAE International. In the 1930s and 1940s, the American Iron and Steel Institute (AISI) and SAE were both involved in efforts to standardize such a numbering system for steels.
440C (UNS designation S44004) is a martensitic 400 series stainless steel, [1] and has the highest carbon content of the 400 stainless steel series. It can be heat treated to reach hardness of 58 to 60 HRC.
American steel grades : AISI/SAE steel grades standard; ... SCM 440 SCM 440H SNB 7 SCM 4M SCM 4 1.6582 1.6562: 34CrNiMo6: 4340: 34CrNiMo6 40NiCrMo8-4: 817M40 En24 ...
The most common "surgical steels" are austenitic SAE 316 stainless and martensitic SAE 440, SAE 420, and 17-4 stainless steels. [1] There is no formal definition on what constitutes a "surgical stainless steel", so product manufacturers and distributors often apply the term to refer to any grade of corrosion resistant steel.
Grades of maraging steel [ edit ] Maraging steels are usually described by a number (e.g., SAE steel grades 200, 250, 300 or 350), which indicates the approximate nominal tensile strength in thousands of pounds per square inch (ksi); the compositions and required properties are defined in US military standard MIL-S-46850D. [ 10 ]
Type 410 is a general purpose grade containing 0.15% maximum carbon. Type 420 increases the carbon content to 0.15% mininum for improved strength; Type 431 has added nickel content for improved corrosion resistance; Types 440A, 440B and 440C increases the carbon content . Type 440C contains 0.95-1.20% carbon for highest hardness.
UNS S17400 is ASTM grade 630, Cr-Ni 17-4PH precipitation hardened stainless steel; UNS S30400 is SAE 304, Cr/Ni 18/10, Euronorm 1.4301 stainless steel; UNS S31600 is SAE 316; UNS S31603 is 316L, a low carbon version of 316. The digits "03" were assigned since the maximum allowed carbon content is 0.03%; UNS C90300 is CDA 903
Ferritic stainless steel alloys are designated as part of the 400-series of stainless steels in the SAE steel grades numbering system. By comparison with austenitic stainless steels, these are less hardenable by cold working and less weldable, but more cost-effective due to the lower nickel content.