Axxxxx - Aluminum Alloys
Cxxxxx - Copper Alloys, including Brass and Bronze
Fxxxxx - Iron, including Ductile Irons and Cast Irons
Gxxxxx - Carbon and Alloy Steels
Hxxxxx - Steels - AISI H Steels
Jxxxxx - Steels - Cast
Kxxxxx - Steels, including Maraging, Stainless Steel, HSLA, Iron-Base Superalloys
Lxxxxx - Low Melting Metals, including Lead and Tin Alloys, Babbit Alloys and Solder Alloys
M1xxxx - Magnesium Alloys
Nxxxxx - Nickel Alloys
Rxxxxx - Refractory Alloys
R03xxx- Molybdenum Alloys
R04xxx- Niobium (Columbium) Alloys
R05xxx- Tantalum Alloys
R3xxxx- Cobalt Alloys
R5xxxx- Titanium Alloys
R6xxxx- Zirconium Alloys
Sxxxxx - Stainless Steels, including Precipitation Hardening Stainless Steel and Iron-Based Superalloys
Txxxxx - Tool Steels
Zxxxxx - Zinc Alloys