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RWMA Class | Alloy Grade | Composition | Minimum Hardness Rockwell | Minimum Electrical Conductivity |
Class | UNS Number | Principal Elements | Up to 1” Dia | %IACS Min. |
Class 1 | C15000 | Cu, Zr | HRB 65 | 80 |
Class 2 | C18200 | Cu, Cr | HRB 75 | 75 |
Class 2 | C18150 | Cu, Cr ,Zr | HRB 75 | 75 |
Class 3 | C17510 | Cu, Ni, Be | HRB 90 | 45 |
Class 3 | C18000 | Cu, Ni, Si, Cr | HRB 90 | 45 |
Class 4 | C17200 | Cu, Be | HRC 33 | 20 |
Class 10 | 10.74450 | Cu, W | HRB 72 | 45 |
Class 11 | 11.74400 | Cu, W | HRB 94 | 40 |
Class 12 | 12.74350 | Cu, W | HRB 98 | 35 |
Class 13 | 13.74300 | W | HRA 69 | 30 |
Class 14 | 14.42300 | Mo | HRB 85 | 30 |
Class 20 | C15760 | Cu, Al oxide | HRB 75 | 75 |