Hastelloy G3
Details
Lork Group high-quality Hastelloy G3 (UNS N06985) is a nickel-chromium-iron alloy with the addition of molybdenum and copper. Has excellent corrosion resistance to oxidizing chemicals and atmospheres while offering resistance to reducing chemicals resulting from the nickel and copper content.
Products Description
Lork Group high-quality Hastelloy G3 (UNS N06985) is a nickel-chromium-iron alloy with the addition of molybdenum and copper. The alloy has excellent corrosion resistance to oxidizing chemicals and atmospheres while offering resistance to reducing chemicals resulting from the nickel and copper content.
Hastelloy G3 has excellent corrosion resistance to oxidizing chemicals and atmospheres. It is also resistant to reducing chemicals because of its nickel and copper contents. Nickel also provides the alloy with exceptional stress-corrosion-cracking resistance in chloride-containing environments. The high molybdenum provides very good resistance to pitting and crevice corrosion. The low carbon helps prevent sensitization, giving the alloy resistance to intergranular corrosion.
Product Form
Rod, Bar, Wire, and Forgings: ASTM B581, ASME SB581, DIN 17752
Plate, Sheet and Strip: ASTM B582, ASME SB582, DIN 17750, ISO 6208
Pipe and Tube: ASTM B619, ASTM B622, ASTM B626, ASTM B751, ASTM B775, ASTM B829, ASME SB619, ASME SB622, ASME SB626, ASME SB751, ASME SB775, ASME SB829
Forgings
Chemical Composition
|
Element |
Content (%) |
|
Chromium, Cr |
21-23.5 |
|
Iron, Fe |
18-21 |
|
Molybdenum, Mo |
6-8 |
|
Cobalt, Co |
5 max |
|
Copper, Cu |
1.5-2.5 |
|
Tungsten, W |
1.5 max |
|
Silicon, Si |
1 max |
|
Manganese, Mn |
1 max |
|
Niobium+Tantalum (Ni+Ta) |
0.5 max |
|
Phosphorus, P |
0.04 max |
|
Sulfur, S |
0.03 max |
|
Carbon, C |
0.015 max |
|
Nickel, Ni |
Remainder |
Physical Properties
|
Properties |
Metric |
Imperial |
|
Density |
8.3 g/cm³ |
0.3 lb/in³ |
|
Melting point |
1343ºC |
2450ºF |
Fabrication and Heat Treatment
Machinability
Can be machined using conventional techniques employed for iron-based alloys. The quality of the alloy can be improved with the utilization of water-based coolants. Heavy-duty machining tools and equipment can be used prior to cutting in order to reduce chattering or work-hardening of the alloy.
Forming
Can be formed through conventional forming methods.
Welding
Welding of Hastelloy G3 is performed through commonly used welding techniques like gas tungsten arc welding, shielded metal-arc welding, metal-arc welding, and submerged-arc welding. However, an alloy filler metal that suits this alloy should be used.
Cold working
Can be cold worked using standard tooling methods. As plain carbon steels produce galling, they are not preferred for forming. Galling can be minimized with the help of heavy-duty lubricants.
Annealing
Annealing of Hastelloy G3 can be performed at 1177ºC (2150ºF) followed by rapid cooling of air and water quenching.
Hardening
It can be hardened by cold working.
Applications
Hastelloy G3 is particularly suitable for handling reducing acids such as phosphoric and sulfuric. It is used in flue gas desulfurization systems (scrubbers), especially in quencher, damper, and outlet ducting areas. It can be used in other air pollution control systems in the chemical and pulp, and paper industries. It is a good candidate for evaporators, heat exchangers, tank liners, and other equipment in phosphoric acid manufacturing plants.