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| Tungsten Heavy Alloys | |||||||||
| typical properties* | |||||||||
| THA-17 | THA-17N | THA-175 | THA-175N | THA-175W | THA-18 | THA-18N | THA-185 | ||
| Density | gm/cc | 17.0 | 17.0 | 17.5 | 17.5 | 17.5 | 18.0 | 18.0 | 18.5 |
| lb/cu. in. | 0.614 | 0.614 | 0.632 | 0.632 | 0.632 | 0.650 | 0.650 | 0.668 | |
| Magnetic Permeability (1=non-magnetic) |
mu | >7.0 | 1.03 | 7.0 | 1.03 | 3.0 | 5.0 | 1.03 | 3.0 |
| Modulus of Elasticity | Msi | 40 | 40 | 45 | 45 | 45 | 50 | 50 | 53 |
| Gpa | 276 | 276 | 310 | 310 | 310 | 345 | 345 | 365 | |
| Tensile Strength | Ksi | 120 | 110 | 120 | 110 | 125 | 120 | 110 | 115 |
| Mpa | 827 | 758 | 827 | 758 | 862 | 827 | 758 | 793 | |
| Yield Strength | Ksi | 85 | 90 | 90 | 85 | 90 | 90 | 85 | 85 |
| 0.2% offset | Mpa | 586 | 620 | 620 | 586 | 620 | 620 | 586 | 586 |
| elongation (1" gage) |
% | 10 | 6 | 12 | 6 | 8 | 8 | 5 | 6 |
| Hardness | HRC | 26 | 25 | 27 | 26 | 30 | 28 | 27 | 30 |
| Thermal Expansion Coefficient (20-400 C) (x 10E-6/C) |
6.00 | 6.00 | 5.75 | 5.75 | 5.75 | 5.50 | 5.50 | 5.25 | |
| Electrical conductivity (%IACS) |
12 | 14 | 13 | 15 | 10 | 14 | 16 | 16 | |
| Thermal conductivity (CGS Units) |
0.19 | 0.22 | 0.21 | 0.24 | 0.26 | 0.24 | 0.27 | 0.29 | |
| Spec. designation | Class 1 | Class 1 | Class 2 | Class 2 | ----- | Class 3 | Class 3 | Class 4 | |
| Composition** | 90% W bal. Fe,Ni, Cu |
90% W bal. Ni, Cu |
92.5% W bal. Fe,Ni, Cu |
92.5% W bal. Ni, Cu |
95% W, Mo bal. Ni, Fe |
95% W Fe,Ni, Cu bal. |
95% W bal. Ni, Cu |
97% W bal. Fe,Ni, Cu | |
| * properties are those derived per 21014D
procedures-from MPA bars; properties are less for thicker
section **can also include Co and other minor elements | |||||||||
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