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Alloy G30 (Hastelloy® G-30, UNS N06030) is a Ni-Cr-Fe corrosion-resistant alloy with alloying additions of molibdenum, tungsten, copper and niobium. Generally resistant to oxidizing environments, it's extremely resistant to phosphoric acid (P2O5) and thus used widely in the production of agrichemical fertilizers. It can be seen as a low-carbon variant of alloy G, with improved weldability (it's less prone to heat-affected zome carbide precipitation and hot-cracking), and ductility.
Applications
Used in phosphoric acid plants, sulphuric acid service, nitric acid service, pickling operations, petrochemical operations, fertilizer manufacture, pesticide manufacture, gold extraction and nuclear waste processing.
Chemical Composition
The following table shows the chemical composition of HASTELLOY(r) G30(r) alloy.
Element | Content (%) |
Nickel, Ni | 43 |
Chromium, Cr | 28.0-31.5 |
Iron, Fe | 13-17 |
Cobalt, Co | 5 |
Molybdenum, Mo | 4-6 |
Tungsten, W | 1.50 - 4 |
Manganese, Mn | 1.50 |
Copper, Cu | 1 - 2 .40 |
Silicon, Si | 0.8 |
Phosphorous, P | 0.040 |
Carbon, C | 0.030 |
Sulfur, S | 0.020 |
Physical Properties
The physical properties of HASTELLOY(r) G30(r) alloy are given in the following table.
Properties | Metric | Imperial |
Density | 8.22 g/cm³ | 0.297 lb/in³ |
Melting point | 1371ºC | 2500ºF |
Mechanical Properties
The mechanical properties of HASTELLOY(r) G30(r) alloy are given in the following table.
Properties | Metric | Imperial |
Tensile strength | 1096 MPa | 159000 psi |
Yield strength (@0.2%) | 1000 MPa | 145000 psi |
Modulus of elasticity (plate heat treated to 1177°C, rapid quenched) | 202 GPa | 29300 ksi |
Elongation at break (in 50.8 mm) | 12% | 12% |
Reduction of area | 57% | 57% |
Hardness, Brinell (converted from Rockwell C hardness) | 304 | 304 |
Hardness, Knoop (converted from Rockwell C hardness) | 326 | 326 |
Hardness, Rockwell C | 32 | 32 |
Hardness, Vickers (converted from Rockwell C hardness) | 316 | 316 |
Thermal Properties
The thermal properties of HASTELLOY(r) G30(r) alloy are given in the following table.
Properties | Metric | Imperial |
Thermal expansion co-efficient (@30-316ºC/86-601ºF) | 14.4 µm/m°C | 8 µin/in°F |
Thermal conductivity | 10.2 W/mK | 70.8 BTU in/hr.ft2.°F |
Other Designations
Equivalent materials to HASTELLOY(r) G30(r) alloy are the following:
ASTM B366
ASTM B581
ASTM B582
ASTM B619
ASTM B622
DIN 2.4603
Fabrication and Heat Treatment
Machinability
HASTELLOY(r) G30(r) alloy can be machined using conventional techniques employed for iron based alloys. The quality of the alloy can be improved with the utilization of water-base 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
HASTELLOY(r) G30(r) alloy can be formed through conventional forming methods.
Welding
Welding of HASTELLOY(r) G30(r) alloy 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.
Heat Treatment
HASTELLOY(r) G30(r) alloy is capable of being annealed. However, this alloy must be solution-annealed after hot forming in order to restore its resistance to corrosion.
Forging
As HASTELLOY(r) G30(r) alloy has good ductile property, it can be forged easily.
Cold Working
HASTELLOY(r) G30(r) alloy can be cold worked using standard tooling methods. As plain carbon steels produce galling, they are not preferred for forming HASTELLOY(r) G30(r) alloy. Galling can be minimized with the help of heavy duty lubricants.
Annealing
HASTELLOY(r) G30(r) alloy can be annealed at 1177ºC (2150ºF) followed by rapid cooling of air and water quenching.
Hardening
HASTELLOY(r) G30(r) alloy can be hardened by cold working.
Applications
The following are the major applications of HASTELLOY(r) G30(r) alloy:
Chemical process equipment
Reheater tubes
Pump components
Agitator blades
Reboilers in nuclear waste reprocessing.
Alloy G30 (Hastelloy® G-30, UNS N06030) is a Ni-Cr-Fe corrosion-resistant alloy with alloying additions of molibdenum, tungsten, copper and niobium. Generally resistant to oxidizing environments, it's extremely resistant to phosphoric acid (P2O5) and thus used widely in the production of agrichemical fertilizers. It can be seen as a low-carbon variant of alloy G, with improved weldability (it's less prone to heat-affected zome carbide precipitation and hot-cracking), and ductility.
Applications
Used in phosphoric acid plants, sulphuric acid service, nitric acid service, pickling operations, petrochemical operations, fertilizer manufacture, pesticide manufacture, gold extraction and nuclear waste processing.
Chemical Composition
The following table shows the chemical composition of HASTELLOY(r) G30(r) alloy.
Element | Content (%) |
Nickel, Ni | 43 |
Chromium, Cr | 28.0-31.5 |
Iron, Fe | 13-17 |
Cobalt, Co | 5 |
Molybdenum, Mo | 4-6 |
Tungsten, W | 1.50 - 4 |
Manganese, Mn | 1.50 |
Copper, Cu | 1 - 2 .40 |
Silicon, Si | 0.8 |
Phosphorous, P | 0.040 |
Carbon, C | 0.030 |
Sulfur, S | 0.020 |
Physical Properties
The physical properties of HASTELLOY(r) G30(r) alloy are given in the following table.
Properties | Metric | Imperial |
Density | 8.22 g/cm³ | 0.297 lb/in³ |
Melting point | 1371ºC | 2500ºF |
Mechanical Properties
The mechanical properties of HASTELLOY(r) G30(r) alloy are given in the following table.
Properties | Metric | Imperial |
Tensile strength | 1096 MPa | 159000 psi |
Yield strength (@0.2%) | 1000 MPa | 145000 psi |
Modulus of elasticity (plate heat treated to 1177°C, rapid quenched) | 202 GPa | 29300 ksi |
Elongation at break (in 50.8 mm) | 12% | 12% |
Reduction of area | 57% | 57% |
Hardness, Brinell (converted from Rockwell C hardness) | 304 | 304 |
Hardness, Knoop (converted from Rockwell C hardness) | 326 | 326 |
Hardness, Rockwell C | 32 | 32 |
Hardness, Vickers (converted from Rockwell C hardness) | 316 | 316 |
Thermal Properties
The thermal properties of HASTELLOY(r) G30(r) alloy are given in the following table.
Properties | Metric | Imperial |
Thermal expansion co-efficient (@30-316ºC/86-601ºF) | 14.4 µm/m°C | 8 µin/in°F |
Thermal conductivity | 10.2 W/mK | 70.8 BTU in/hr.ft2.°F |
Other Designations
Equivalent materials to HASTELLOY(r) G30(r) alloy are the following:
ASTM B366
ASTM B581
ASTM B582
ASTM B619
ASTM B622
DIN 2.4603
Fabrication and Heat Treatment
Machinability
HASTELLOY(r) G30(r) alloy can be machined using conventional techniques employed for iron based alloys. The quality of the alloy can be improved with the utilization of water-base 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
HASTELLOY(r) G30(r) alloy can be formed through conventional forming methods.
Welding
Welding of HASTELLOY(r) G30(r) alloy 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.
Heat Treatment
HASTELLOY(r) G30(r) alloy is capable of being annealed. However, this alloy must be solution-annealed after hot forming in order to restore its resistance to corrosion.
Forging
As HASTELLOY(r) G30(r) alloy has good ductile property, it can be forged easily.
Cold Working
HASTELLOY(r) G30(r) alloy can be cold worked using standard tooling methods. As plain carbon steels produce galling, they are not preferred for forming HASTELLOY(r) G30(r) alloy. Galling can be minimized with the help of heavy duty lubricants.
Annealing
HASTELLOY(r) G30(r) alloy can be annealed at 1177ºC (2150ºF) followed by rapid cooling of air and water quenching.
Hardening
HASTELLOY(r) G30(r) alloy can be hardened by cold working.
Applications
The following are the major applications of HASTELLOY(r) G30(r) alloy:
Chemical process equipment
Reheater tubes
Pump components
Agitator blades
Reboilers in nuclear waste reprocessing.
