UNS N06022 | Werkstoff Nr 2.4602 | ASTM B574 | DIN 17753 | ASME SB 906 | ASME Code Case 2226 | ISO 6208

Introduction

Super alloys contain a number of elements in a variety of combinations to achieve the desired result. They have good creep and oxidation resistance. They are available in different shapes, and can be used at very high temperatures and mechanical stress, and also where high surface stability is required. Cobalt-based, nickel-based, and iron-based alloys are three types of super alloys. All of these can be used at temperatures above 540°C (1000°F).

Hastelloy C22 is a nickel-chromium-molybdenum alloy. It has high resistance corrosion and metallurgical stability. It is not sensitized during heating or welding. The following datasheet gives more details about Hastelloy C22.

Chemical Composition

The following table shows the chemical composition of Hastelloy C22.

Element	Content (%)
Chromium, Cr	20-22.5
Molybdenum, Mo	12.5-14.5
Tungsten, W	2.5-3.5
Cobalt, Co	2.5 min
Iron, Fe	2-6
Manganese. Mn	0.5 max
Vanadium, V	0.35 min
Silicon, Si	0.08 max
Phosphorus, P	0.02 max
Sulfur, S	0.02 max
Carbon, C	0.015 max
Nickel, Ni	Remainder

Physical Properties

The physical properties of Hastelloy C22 are outlined in the following table.

Properties	Metric	Imperial
Density	8.69 g/cm³	0.314 lb/in³
Melting point	1399°C	2550°F

Mechanical Properties

The mechanical properties of Hastelloy C22 are displayed in the following table.

Properties	Metric	Imperial
Elastic modulus	206 MPa	29878 psi

Thermal Properties

The thermal properties of Hastelloy C22 are given in the following table.

Properties	Metric	Imperial
Thermal conductivity (at 100°C/212°F)	11.1 W/mK	6.4 BTU in/hr.ft².°F

Machinability

Hastelloy C22 can be machined using high-speed steel tooling. Carbide tools are used for milling or turning. Machining operations can be performed using conventional coolants.

Forming

Hastelloy C22 can be easily hot or cold formed followed by heat treatment.

Welding

Except submerged arc welding method, Hastelloy C22 can be welded using all other welding methods.

Heat Treatment

Hastelloy C22 is heat treated by annealing at 1122°C (2050°F) followed by quenching.

Forging

Hastelloy C22 is hot forged at 1149°C (2100°F) followed by heat treatment.

Hot Working

Hastelloy C22 has good hot working capacity.

Cold Working

Hastelloy C22 has cold working capacity.

Aging

Hastelloy C22 is aged at 510 to 1038°C (950 to 1900°F) to increase its tensile strength and hardness. However, V-notch impact strength can be degraded if aging is done above 760°C (1400°F).

Hardening

Hastelloy C22 cannot be hardened by heat treatment or cold working.

Applications

Hastelloy C22 is used for manufacturing different types of chemical process equipments such as:

• Chlorination systems
• Flue gas scrubbers
• Outlet ducting and stack liners for power plants, pulp and paper bleach plants, sulfur dioxide scrubbers, and weld overlay of less corrosion resistant metals
• Acid production and pickling systems.

Specifications

• ASTM B366
• ASTM B564
• ASTM B574
• ASTM B575
• ASTM B619
• ASTM B622
• DIN 17753
• UNS N06022
• Werkstoff Nr 2.4602
• ASME SB 906
• ASME Code Case 2226
• ISO 6208