| Group C Specialty Materials | Alloy Number | Rockwell Hardness |
Electrical Conductivity %IACS [Ms/m] |
Yield Strength 0.2% Offset Ksi [Mpa] |
Ultimate Tensile Strength Ksi [Mpa] |
Elongation % | ||||||
| Minimum | Minimum | Typical | Typical | IN 2" or 4 X D | ||||||||
| Class 20 | C15760 | 75 HRB | 75% [43.5] | 60 [413] | 74 [510] | 25 | ||||||
| Class 21 | C15715 | 62 HRB | 92% [53] | 48 [331] | 58 [400] | 30 | ||||||
| Class 22 | C15725 | 68 HRB | 87% [50] | 54 [332] | 65 [448] | 27 | ||||||
Note: Acceptance is based on hardness and conductivity only.
Reference: American Welding Society Publication J1.3
