| Group A Copper Base Alloys¹ | Minimum Hardness Rockwell B or C as noted² |
Minimum Electrical Conductivity % IACS [Ms/m] |
|||||||
| Size Range | Class | Class | |||||||
| IN | MM | 1 | 2 | 3 | 4 | 1 | 2 | 3 | 4 |
| Diameter - Round Bar Stock | |||||||||
| Up to 1" | Up to 25 | 65 HRB | 75 HRB | 90 HRB | 33 HRB | 80% [46] | 75% [43.5] | 45% [26] | 20% [11.6] |
| Over 1"-2" | Over 25-51 | 60 HRB | 70 HRB | 90 HRB | 33 HRC | 80% [46] | 75% [43.5] | 45% [26] | 20% [11.6] |
| Over 2"-3" | Over 51-76 | 55 HRB | 65 HRB | 90 HRB | 33 HRC | 80% [46] | 75% [43.5] | 45% [26] | 20% [11.6] |
| Over 3"-3 1/2" | Over 76-89 | 50 HRB | 65 HRB | 90 HRB | 33 HRC | 80% [46] | 75% [43.5] | 45% [26] | 20% [11.6] |
| Thickness - Square, Rectangular & Hexagonal Bar Stock | |||||||||
| Up to 1" | Up to 25 | 55 HRB | 70 HRB | 90 HRB | 33 HRB | 80% [46] | 75% [43.5] | 45% [26] | 20% [11.6] |
| Over 1" | Over 25 | 50 HRB | 65 HRB | 80% [46] | 75% [43.5] | 45% [26] | 20% [11.6] | ||
| Thickness - Forgings and Plates | |||||||||
| Up to 1" | Up to 25 | 55 HRB | 65 HRB | 90 HRB | 33 HRB | 80% [46] | 75% [43.5] | 45% [26] | 20% [11.6] |
| Over 1" to 2" | Over 25 - 51 | 50 HRB | 65 HRB | 90 HRB | 33 HRB | 80% [46] | 75% [43.5] | 45% [26] | 20% [11.6] |
| Over 2" | Over 51 | 50 HRB | 65 HRB | 90 HRB | 33 HRB | 80% [46] | 75% [43.5] | 45% [26] | 20% [11.6] |
Notes:
1. All materials are in the fully heat treated and hardened condition
2. Rod and bar hardness is determined at mid-radius in accordance with ASTM test method E18
Reference:
- American Welding Society Publication J1.3
