Properties of Hastelloy
Hastelloy is a nickel alloy that is resistant to corrosion and contains other chemical elements such as chromium and molybdenum. This material is extremely resistant to corrosion and has a high temperature resistance. The types of Hastelloy used in the oil and gas industry are Hastelloy C22 Sheets and Hastelloy C22 Plates. Hastelloy is available in a variety of grades, each with a unique chemical composition optimized for a specific set of properties.
Hastelloy performs better in severely corrosive environments than other specialty metal products such as Incoloy due to its high molybdenum and chromium content. The addition of molybdenum improves overall work ability. Hastelloy alloys are also ductile, allowing for easy fabrication and shaping.
Characteristics Of Hastelloy grades:
Good corrosion resistance
Excellent weld ability
Resistance to Acid and oxidizing agents
How is Hastelloy Manufactured?
Because Hastelloy C22 Plates it is created by combining raw elements in a hot liquid state. There are various grades, each with its own chemical composition. A mix may contain between 1% and 25% chromium, 5% to 30% molybdenum, and 0% to 30% iron, with nickel making up the difference. Depending on the grade, additional additives may include carbon, tungsten, vanadium, and titanium.
Once the metals have been combined, melted, and mixed, they can be cast for further manufacturing.
What are the Uses of Hastelloy?
Since Hastelloy is designed to be extremely corrosion resistant, it is an excellent choice for any moderate to severe corrosive environment where product lifetime is critical. It is commonly used in the chemical and petrochemical industries for pipes and valves. In the chemical and nuclear industries, it is also used in reactor vessels.
There are numerous Hastelloy grades, but C22 is one of the most common. This grade is commonly used in the above- mentioned harsh environments, as well as paper and pulp production and waste treatment.
Hastelloy Properties
Though the properties of Hastelloy vary depending on the grade, they usually include the following:
1. Outstanding corrosion resistance
2. Density (g/cm3): 8.89
3. Melting temperature: 1323-13710 C
4. Tensile Strength: 690–773 MPa
5. Excellent weld ability
6. Excellent resistance to oxidizing agents and acids
Types and Grades of Hastelloy Alloy
Hastelloy Metal Grades that are Commonly Used:
Hastelloy B alloys
Nickel and molybdenum are abundant in Hastelloy B-type super alloys. Hastelloy B is known for its ability to withstand extreme reducing environments. Examples of B-type Hastelloy materials include:
B-2 Alloy (UNS N10665): The B-2 Hastelloy consists of 65% nickel and 30% molybdenum. Carbon, iron, silicon, chromium, cobalt, manganese, and sulfur are also present in trace amounts. Although B-grade alloy is resistant to hydrochloride acids, it is not resistant to oxidizing agents.
B-3 Alloys (UNS N10675): This alloy is more resistant to pitting corrosion and has better thermal stability than B-2 alloys. B-3 alloys are composed of 65% nickel and 30% molybdenum, with traces of chromium, cobalt, and manganese.
Hastelloy C alloys
This grade of Hastelloy has a high percentage of nickel, chromium, and molybdenum. Chromium improves high-temperature properties as well as resistance to reducing environments. Hastelloy C grades can be used in both cold and hot conditions. C+ grade the most common Hastelloy material is Hastelloy metal. C-type Hastelloy materials include the following:
Hastelloy C-4 (UNS N06455): Type C-4 Hastelloy is composed of 60% nickel, 18% chromium, 16% molybdenum, 3% iron, 2% cobalt, and the remainder silicon, carbon, sulfur, titanium, and other elements. It is ductile and corrosion resistant.
Hastelloy C-22 (UNS N06022): C-22 Hastelloy is composed of 58% nickel, 20% chromium, 13% molybdenum, 3.5% tungsten, 2.5% cobalt, and other elements in trace amounts. C-22 Hastelloy is the most commonly used alloy for pharmaceutical reaction vessels and depressurization systems due to its weld ability.
Hastelloy C-276 (UNS N10276): In the petrochemical industry, this Hastelloy grade is used. It is composed of 59% nickel, 16% molybdenum, 15% chromium, 4% tungsten, and many other elements. It is oxidizing agent, pitting, stress corrosion cracking, and inter granular corrosion resistant.
C-2000 Hastelloy: It is used in chemical process equipment because of its excellent resistance to oxidizing media.
G-type Hastelloy
Suitable for TIG, SAW, SMAW, and G-type welding. Tungsten is an alloying element in Hastelloy materials. This group’s main alloys are:
Hastelloy G-3 (UNS N06985): The main components of this super alloy are nickel, chromium, tungsten, iron, molybdenum, and cobalt.
Hastelloy G-30 (UNS N06030): It is made up of 43% nickel, 30% chromium, 15% iron, 5% cobalt, 4% tungsten, 1.5% manganese, and other essential elements.
Hastelloy X
UNS N06002 Hastelloy X alloy: It has excellent oxidation resistance, high-temperature strength, and resistance to SCC. Hastelloy X is made up of 44% nickel, 23% chromium, 20% iron, 10% molybdenum, 1% manganese, and silicon, among other elements. They are cold-worked and weldable. This type of Hastelloy alloy is used in industrial furnaces and gas turbines.
Hastelloy N (UNS N10003)
Hastelloy N is made up of 71% nickel, 7% chromium, 16% molybdenum, 5% iron, 1% silicon, and trace elements. Hastelloy N is used in industrial applications such as chemical process equipment due to its higher temperature oxidation resistance properties.
Other Hastelloy Grades are as Follows:
D-205 Hastelloy
G50 Hastelloy (UNS N06950)
S Hastelloy (UNS N06635)
W Hastelloy (UNS N10004)
G-2 Hastelloy (UNS N06975)
