INDEX SYSTEM FOR AISI AND SAE STEELS

Choose one category Carbon, manganese and nickel steels Nickel, chromium and molybdenum steels Chromium - molybdenum - vanadium steels Nickel - chromium -vanadium steels Silicon - manganese steels Carbon steels Other steels

The American Standard designations ( AISI, SAE ) reveal the basic composition of a given steel grade. The following is a key to the system classification employed by AISI ( American Iron and Steel Institute ) and SAE ( Society of Automotive Engineers ). The first digit of the designation indicates the steel group ( 1 meaning unalloyed steel, 2 nickel steel, 3 nickel-chromium steel and so on ). The second digit indicates the approximate percentage of the mean carbon content multiplied by 100.

Examples:
AISI 1055 = Unalloyed Steel with 0.55% Carbon
AISI 2345 = Nickel Steel with approximately 3% Nickel and 0.45% Carbon
AISI 4042 = Molybdenum Steel with 0.42% Carbon

For higher alloyed steels ( ie. Stainless, heat resisting and other austentic steels ) this system has been abandoned.

CARBON, MANGANESE AND NICKEL STEELS

NICKEL-CHROMIUM AND MOLYBDENUM STEELS

CHROMIUM,CHROMIUM-MOLYBDENUM AND CHROMIUM-VANADIUM STEELS

NICKEL-CHROMIUM-MOLYBDENUM STEEL

SILICON-MANGANESE STEEL, RE SULFURIZED AND RE PHOSPHORIZED CARBON STEELS

NON-RE SULFERIZED CARBON STEELS

OTHER STEELS