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Hastelloy G30–Composition, Properties and Application

Views: 3     Author: Wang     Publish Time: 2024-06-27      Origin: Site

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Description about Hastelloy G30

Hastelloy G30 alloy (UNS N06030) is a nickel-chromium-iron material,With higher chromium, added cobalt and tungsten,  the G-30 has 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. G-30 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. The 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. 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.


It possesses moderate resistance to reducing acids, such as hydrochloric and sulfuric, as a result of its appreciable molybdenum and copper contents. HASTELLOY G30 alloy is available in the form of plates, sheets, strips, billets, bars, wires, pipes, tubes, and covered electrodes. Applications include P2O5 evaporator tubes and nitric acid-based, metal pickling hardware.


Designated as UNS N06030 or DIN 2.4603, 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, G-30 alloy is less susceptible to chloride-induced stress corrosion cracking than the stainless steels. Due to the high chromium content Hastelloy G30 is also very resistant to other oxidizing acids, such as nitric, and mixtures containing nitric acid. The appreciable amount of molybdenum and copper addition makes it moderately resistant to reducing acids, such as hydrochloric and sulfuric. Hastelloy G30 is widely used in phosphoric, sulfuric, and nitric acid processing industries, nuclear piping, petrochemical and fertilizer industries.


Chemical composition of Hastelloy G30

Hastelloy G30 offers superior corrosion resistance to commercial phosphoric acid and many complex environments containing strong oxidizing acids such as nitric acid/hydrochloric acid, nitric acid/hydrofluoric acid and sulfuric acid. It can prevent the formation of grain boundary precipitation in the welding heat affected zone, so that it can adapt to many kinds of chemical working conditions in the welding state. The chemical composition of Hastelloy G30 mainly includes the following elements:

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


Features of Hastelloy G30

Machinability

HASTELLOY G30 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.


Welding

Welding of Hastelloy G30 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 G30 alloy is capable of being annealed. However, this alloy must be solution-annealed after hot forming in order to restore its resistance to corrosion. G30 forgings are supplied in solution treated condition. Solid solution treatment involves heating to 1177 ° C and then rapid air or water cooling. Hot formed components must undergo solution treatment before final assembly.


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.


Cold Working

Hastelloy G30 alloy can be cold worked using standard tooling methods. As plain carbon steels produce galling, they are not preferred for forming HASTELLOY G30 alloy. Galling can be minimized with the help of heavy duty lubricants.


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.


Applications of Hastelloy G30

Chemical/petrochemical processing

Since Hastelloy G30 is resistant to a wide range of chemicals and chemical processing, it is widely used in the chemical industry. It is commonly used for handling corrosive acids, strong oxidizers, and aggressive chemicals. Hence it is commonly used to handle sulfuric acid, acetic acid, and hydrochloric acid. Moreover, it is also used in reactors, heat exchangers, and piping systems. Additionally, it is used in the agrochemical industry to handle agricultural chemicals and pesticides.


Oil & gas industry

Hastelloy G30 is typically deployed in offshore and onshore applications. It is also widely used in gas exploration and production as it is resistant to sour gas and corrosive environments.


Pharmaceutical

It is yet another industry that needs corrosive-resistant materials. Like stainless steel, Hastelloy G30 is also widely used in the pharma industry. It is mainly used for various equipment such as reaction vessels and storage tanks where high purity and corrosion resistance are critical.


Aerospace

Hastelloy G30 is capable of handling high temperatures and harsh environments.  Therefore, it is commonly used for making aerospace components such as engine parts. Hastelloy G-30 can be used to manufacture parts and components of aero-engines, such as turbine blades and turbine disks. These parts need to work in high-temperature environments and withstand high pressure and vibration loads, and Hastelloy G-30 can meet these requirements.


Marine engineering

Hastelloy G30 can be used to manufacture parts and components for marine engineering structures, such as components for offshore platforms and ship parts. These components need to work in seawater environments and withstand the erosive effects of high-strength and highly corrosive media, while Hastelloy G-30 provides excellent corrosion resistance and strength guarantees.


Conclusion

Hastelloy G30 is a versatile nickel-based alloy with outstanding corrosion resistance in aggressive environments. It offers exceptional physical and mechanical properties, making it ideal for various industries. The alloy’s unique composition provides excellent corrosion resistance and high-stress capabilities, making it a popular choice for critical applications. Its heat treatment, welding ability, and corrosion resistance suit marine and chemical processing applications. Understanding the unique properties and features of Hastelloy G30 is critical in selecting appropriate materials for specific applications.

JN Alloy is a distributor and product manufacturer of stainless steel, duplex steel, and nickel.
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