Unit Converters:
Boiler, Superheater, and Miscellaneous Tubes
| The American Standard designations as per AISI or SAE reveal the basic composition of a given steel grade. The following is a key to the system classification employed by American Iron and Steel Institute and 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 |
| 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. |
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