Hastelloy C-22 Precision Tube (UNS N06022)

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Hastelloy C-22 Precision Tube (UNS N06022)

Hastelloy C-22 seamless precision tube, at T.S. Industrial, are available in outside diameter from 6.35mm to 219.1mm. Our tubes are custom-made as per client’s requirements.

Description

Hastelloy C-22 is a nickel-based high-temperature alloy composed of nickel, molybdenum, cobalt, tungsten and other elements. It is an all-around nickel-chromium-molybdenum-tungsten alloy with better overall corrosion resistance than other existing nickel-chromium-molybdenum alloys.

C-22 alloy has ideal resistance to reducing and oxidizing environments and can be used in some troublesome environments or in factories for various production purposes. It has an exceptional resistance to various chemical environments, including strong oxidizing substances such as ferric chloride, cupric chloride, formic acid, acetic acid, acetic anhydride, seawater and salt solutions.

Performance Introduction of Hastelloy C-22 Precision Tube

⚑ Corrosion resistance：This is the biggest advantage of Hastelloy C-22 alloy.

Hastelloy C-22 alloy has excellent resistance to various corrosive environments.

Corrosion types that can be resisted

✔ General corrosion

✔ Pitting corrosion

✔ Crevice corrosion

✔ Intergranular corrosion

✔ Stress corrosion cracking

⚑ Withstands oxidizing and reducing corrosive compounds

✔ Media types:

Wet chlorine, nitric acid, chlorinated acid mixtures with chloride ions, formic acid, acetic acid, acetic anhydride, seawater, saline solutions

Hastelloy C-22 is one of the only materials that is resistant to corrosion by moist chlorine gas, hypochlorite and chlorine dioxide solutions.

⚑ Welding performance: good

⚑ Working temperature: up to 675℃ (1250℉)

Chemical Composition

Grade

C-22

Rest

20-22.5

12.5-14.5

2-6

2.5-3.5

≤0.015

≤0.08

≤2.5

≤0.5

≤0.35

≤0.02

Functions of each element:

✔ Ni: Main component, provides good corrosion resistance

✔ Cr: Enhances the oxidation resistance and corrosion resistance of the alloy

✔ Mo: Further improves the corrosion resistance of the alloy, especially in chloride ion-containing environments

✔ W: Helps improve the overall corrosion resistance of the alloy

Mechanical Properties

Grade	Tensile Strength	Yield Strength	Elongation	Hardness
C-22	500-800 MPa	200-400 MPa	≥45%	88 HRB-43 HRC

Physical Properties

✔ Density: 8.69 g/cm³

✔ Melting point: 1325-1370℃

✔ Thermal expansion coefficient (at 21-193℃): 12.42 μm/m·℃

✔ Thermal conductivity (at room temp.): 11 W/m·K

✔ Specific heat capacity: 0.49~0.414 J/g·℃

✔ Elastic modulus: 200-206 GPa

★ Available Specification at T.S. Industrial

✔ Standard: ASTM B622 & ASTM B829

✔ Size: OD 6.35mm-219.1mm

✔ Ends: PE & BE

MTC (Material Test Certification) Will be provided when the goods are delivered

Metallographic structure: face-centered cubic lattice structure

Intergranular corrosion test index as per ASTM G28

Corrosion rate value:

✔ Based on method A: 35

✔ Based on method B: 6

Comparison with Hastelloy Alloy C-276

Alloys C-22 and C-276 are both known for their excellent corrosion resistance in both oxidizing and reducing environments. However, there are some differences between the two, mainly in application temperature and application environment.

⚑ Applicable Environment

✔ Alloy C-22 has a higher chromium content for better corrosion resistance in oxidizing environments

✔ Alloy C-276 has a higher molybdenum and tungsten content for better corrosion resistance in reducing environments

✔ Alloy C-22 has a wider range of corrosion resistance, especially in wet chlorine, hypochlorite and ferric chloride media

✔ Alloy C276 performs better in environments with strong acids (such as sulfuric acid, hydrochloric acid, phosphoric acid), especially under high temperature conditions

⚑ Working Temperature

✔ Alloy C-22 is suitable for applications at 676°C [1250°F]

✔ Alloy C-276 is suitable for applications at 1037°C [1900°F]

Therefore, if your application environment involves multiple corrosive media and the operating temperature is relatively low, Hastelloy C22 may be a better choice while Hastelloy C276 may be more suitable if your equipment needs to deal with strong acid corrosion and high operating temperature.

Equivalent Grade of Hastelloy C-22

Alloy 22

W.Nr. 2.4602

NiCr21Mo14W

JIS NW 6022

Application Industries

✔ Petrochemicals

✔ Pollution control (flue gas desulfurization)

✔ Power generation

✔ Waste treatment

✔ Biopharmaceuticals

✔ Marine industry