Super alloys or high performance alloys are used at environments with very high temperature above 540ºC(1000ºF) where deformation resistance and high surface stability are chiefly required. They have good oxidation and creep resistance. Cobalt-base, nickel-base and iron-base alloys are the three major types of super alloys. The iron-base super alloys are generally wrought alloys provided with stainless steel technology. Nickel-base and cobalt-base super alloys may be cast or wrought based on its composition or application. Super alloys can be generally forged, rolled to sheet or produced in different shapes. Highly alloyed compositions are formed as castings. They can be strengthened using hardening techniques like work hardening, solid-solution hardening and precipitation hardening.
The following section will discuss in detail about super alloy HASTELLOY G-2 (UNS N06975) pipe.
Chemical Composition
The chemical composition of super alloy HASTELLOY G-2 (UNS N06975) pipe is listed in the following table.
| Element | Content (%) |
|---|---|
| Nickel, Ni | 47-52 |
| Chromium, Cr | 23-26 |
| Molybdenum, Mo | 5-7 |
| Silicon, Si | 1 max |
| Manganese, Mn | 1 max |
| Titanium, Ti | 0.7-1.5 |
| Copper, Cu | 0.7-1.2 |
| Phosphorus, P | 0.03 max |
| Carbon, C | 0.03 max |
| Sulfur, S | 0.03 max |
| Iron, Fe | Balance |
Physical Properties
The following table shows the physical properties of super alloy HASTELLOY G-2 (UNS N06975) pipe.
| Properties | Metric | Imperial |
|---|---|---|
| Density | 7. 7-8.03 g/cm³ | 0.278-0.290 lb/in³ |
| Melting point | 1370-1400°C | 2498-2552°F |
Mechanical Properties
The mechanical properties of super alloy HASTELLOY G-2 (UNS N06975) pipes are outlined in the following table.
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength | 1158 MPa | 195100 psi |
| Yield strength | 1034 MPa | 14996 psi |
| Elastic modulus | 190-210 GPa | 27557-30457 ksi |
| Poisson's ratio | 0.27-0.30 | 0.27-0.30 |
| Elongation | 15% | 15% |
| Reduction in area | 53% | 53% |
| Hardness | 335 | 335 |
Thermal Properties
The thermal properties of super alloy HASTELLOY G-2 (UNS N06975) pipes are outlined in the following table.
| Properties | Conditions | ||
|---|---|---|---|
| T (ºC) | Treatment | ||
| Thermal conductivity | 42.7 W/mK | 100 | - |
Other Designations
Other designations that are equivalent to super alloy HASTELLOY G-2 (UNS N06975) pipes include the following:
- ASTM B619
- ASTM B622
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