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Hastelloy G30 From China Manufacturer

Views: 1 Author: Wang Publish Time: 2024-09-11 Origin: Site

What is Hastelloy G30?

HASTELLOY G30 alloy (UNS N06030) is a nickel-chromium-iron material highly resistant to “wet process” phosphoric acid (P2O5). P2O5 is one of the most important industrial chemicals, being the primary source of phosphorus for agrichemical fertilizers. G30 alloy is also moderately resistant to chloride-induced localized attack, which can be a problem beneath deposits in the evaporators used to concentrate P2O5. Furthermore, G30 alloy is less susceptible to chloride-induced stress corrosion cracking than the stainless steels.

Designated as UNS N06030 or DIN 2.4603, Hastelloy G30 is a nickel-chromium-iron material which has excellent resistance to phosphoric acid environment(wet process). It is also moderately resistant to chloride-induced localized attack, which can be a problem beneath deposits in the evaporators used to concentrate phosphoric acid. Furthermore, G30 alloy is less susceptible to chloride-induced stress corrosion cracking than the stainless steels. The appreciable amount of molybdenum and copper addition makes it moderately resistant to reducing acids, such as hydrochloric and sulfuric. Hastelloy G-30 is widely used in phosphoric, sulfuric, and nitric acid processing industries, nuclear piping, petrochemical and fertilizer industries.

With higher chromium, added cobalt and tungsten, Hastelloy G30 shows superior corrosion resistance over most other nickel and iron based alloys in commercial phosphoric acids as well as complex environments containing highly oxidizing acids. As a result of its high chromium content, G30 alloy is also very resistant to other oxidizing acids, such as nitric, and mixtures containing nitric acid. It possesses moderate resistance to reducing acids, such as hydrochloric and sulfuric, as a result of its appreciable molybdenum and copper contents.The resistance of the alloy to the formation of grain boundary precipitates in the heat-affected zone makes it suitable for use in most chemical process applications in the as-welded condition.

HASTELLOY G30 is basically the same as other high alloys in regard to formability. It is generally stiffer than an austenitic. Because of its good ductility, cold working is relatively easy and is the preferred method of forming. The alloy is easily weldable using Gas-Tungsten Arc, Gas Metal Arc and shielded Metal Arc.

Chemical Composition of Hastelloy G-30

Hastelloy G30 is a highly alloyed nickel-chromium-molybdenum-tungsten alloy with a small amount of iron. It also contains cobalt, vanadium, and nitrogen. The unique composition of Hastelloy G30 provides outstanding resistance to both reducing and oxidizing acids, making it ideal for applications where corrosion resistance is paramount.

The Chemical Composition of Hastelloy G30, %
Ni	Balance
Co	≤5.0
Cr	28.0-31.5
Mo	4.0-6.0
W	1.5-4.0
Fe	13.0-17.0
Si	≤0.8
Mn	≤1.5
C	≤0.03
Cb+Ta	0.3-1.5
Cu	1.0-2.4
P	≤0.04
S	≤0.02

Hastelloy G30 Physical Properties

Hastelloy G30 exhibits excellent physical properties such as high tensile strength, good ductility, and low thermal expansion. The density of this alloy is 8.22 g/cm³. It has a melting point of 1399°C and a boiling point of 3045°C. It also shows an excellent thermal conductivity of 8.62 W/m·K.

Properties	Metric	Imperial
Density	8.22 g/cm³	0.297 lb/in³
Melting point	1371ºC	2500ºF

Hastelloy G30 Mechanical Properties

Hastelloy G30 has exceptional mechanical properties that make it suitable for high-stress applications. The yield strength of this alloy is 416 MPa, whereas its ultimate tensile strength is 760 MPa. It has a hardness of 290 HB.

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

Hastelloy G30 Characteristic

High-temperature

The high-temperature performance of Hastelloy G-30 is one of its most important characteristics. At high temperatures, its oxidation resistance and corrosion resistance are excellent. Its oxidation resistance is mainly due to its content design and manufacturing process, which effectively resists high-temperature oxidation and corrosion. At the same time, its corrosion resistance is also good, capable of resisting corrosion from various media.

Corrosion Resistance

Hastelloy G30 is known for its exceptional corrosion resistance in oxidizing and reducing media. It resists attacks from hot and cold sulfuric acid solutions with concentrations up to 50%. It also resists nitric, acetic, and phosphoric acids, making it suitable for chemical processing industries. The alloy is also resistant to crevice and pitting corrosion in seawater and other chloride-containing environments.

Heat Treatment

Hastelloy G30 can be heat-treated to achieve different strength levels. The solution-annealing treatment is the most common, which is carried out at a temperature range of 1070-1150°C. The alloy is then quenched in water or rapidly cooled in air. Another heat treatment process is the precipitation hardening method, which increases the hardness of the alloy.

Welding

Hastelloy G30 is weldable using many methods like TIG, MIG, and arc welding. The choice of welding method depends on the application and the desired mechanical properties. Care must be taken during welding to preserve the corrosion resistance of the alloy.