Hastelloy G is a nickel-chromium alloy known for its exceptional resistance to corrosion and heat. This material is widely used in various industrial applications and is designed for harsh environments. In this blog post, we’ll look closer at the composition, physical and mechanical properties, and various uses of Hastelloy G.
Hastelloy G Composition
Hastelloy G comprises nickel, chromium, and molybdenum, with small amounts of cobalt, iron, and tungsten. Its chemical composition is designed to withstand extreme temperatures, making it ideal for use in harsh environments. The alloy is known for its exceptional resistance to corrosion and oxidation.
| Element | Content (%) |
|---|---|
| Chromium, Cr | 21-23.5 |
| Iron, Fe | 18-21 |
| Molybdenum, Mo | 5.5-7.5 |
| Cobalt, Co | 2.5 max |
| Niobium, Nb | 1.75-2.5 |
| Copper, Cu | 1.5 min |
| Manganese, Mn | 1-2 |
| Silicon, Si | 1 max |
| Tungsten, W | 1 max |
| Carbon, C | 0.05 max |
| Phosphorus, P | 0.04 max |
| Sulfur, S | 0.03 max |
| Nickel, Ni | Remainder |
Hastelloy G Physical Properties
Hastelloy G has a specific gravity of 8.22 and a melting point of 1370°C. It has excellent thermal conductivity and is highly resistant to corrosion. The material also has good resistance to creep, making it ideal for use in high-temperature applications.
| Properties | Metric | Imperial |
|---|---|---|
| Density | 8.91 g/cm³ | 0.322 lb/in³ |
| Melting point | 1343ºC | 2450ºF |
Hastelloy G Mechanical Properties
Hastelloy G has excellent mechanical properties, making it an ideal choice for high-strength and tough applications. It has a tensile strength of 675 MPa and a yield strength of 280 MPa. The material is also known for its exceptional fatigue strength and resistance to cracking.
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength | Min 760 MPa | Min 110000 psi |
| Yield strength (0.2% offset) | 700-860 MPa | 102000-125000 psi |
| Modulus of elasticity (room temperature) | 192 GPa | 27800 ksi |
| Elongation at break | Min 20% | Min 20% |
| Hardness, Brinell ( estimated from Rockwell C for Brinell 10 mm ball/3000 kg load) | 290 | 290 |
| Hardness, Knoop (estimated from Rockwell C) | 345 | 345 |
| Hardness, Rockwell A (estimated from Rockwell C) | 66 | 66 |
| Hardness, Rockwell C | Max 31 | Max 31 |
| Hardness, Vickers (estimated from Rockwell C) | 300 | 300 |
Hastelloy G Equivalents
- ASTM B581
- ASTM B582
- ASTM B619
- ASTM B622
- ASTM B626
- DIN 2.4618
Hastelloy G Uses
Hastelloy G is used in various applications, including chemical processing, gas turbines, industrial furnaces, and heat exchangers. The alloy is also used to produce industrial chemicals in the aerospace industry. It is known for its exceptional resistance to various corrosive environments, making it ideal for harsh chemical applications.
Hastelloy G Hardness
Hastelloy G has a maximum hardness of HRB 95. However, it can be easily machined, making it an ideal choice for various industrial applications.
Hastelloy G Heat Treatment
Hastelloy G can be heat-treated to improve its strength and toughness. The material can be annealed between 870°C and 980°C, followed by water quenching. It can also be solution annealed at temperatures between 1038°C and 1149°C.
Hastelloy G Welding
Hastelloy G can be welded using standard welding methods. However, it is recommended that the material be preheated to reduce the risk of cracking. The alloy can be welded using gas tungsten arc welding (GTAW), gas metal arc welding (GMAW), and shielded metal arc welding (SMAW).
Hastelloy G Corrosion Resistance
Hastelloy G is highly resistant to corrosive environments, including sulfur and hydrofluoric acid. It is also resistant to pitting and crevice corrosion, making it an ideal choice for harsh chemical environments.
Conclusion
Hastelloy G is an exceptional nickel-chromium alloy that is used in a range of industrial applications. Its exceptional resistance to corrosion, high strength, and toughness make it an ideal choice for harsh environments. With its exceptional physical and mechanical properties, Hastelloy G is a reliable material trusted by many industries for its performance, durability, and versatility.
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