Hastelloy C22 Round Bars, Alloy C-22 Bars, Hastelloy C22 Bar

Product Description

1. Material Identification and Cross References

• Trade Name: Hastelloy C-22 / Alloy C-22 / Nickel C-22

• UNS Designation: UNS N06022

• DIN / WNr Standard: 2.4602

• EN Designation: NiCr21Mo14W

• ASTM Specifications: ASTM B574 (Rod and Bar), ASTM B575, ASTM B619, ASTM B622

• ASME Specifications: ASME SB-574

• NACE Specification: NACE MR0175 / ISO 15156 (Oil and Gas sour service)

• AFNOR (France): NC21D12W

2. Chemical Composition (Nominal Mass Percent)

• Nickel: Balance (Approximately 56.0)

• Chromium: 20.0 to 22.5

• Molybdenum: 12.5 to 14.5

• Iron: 2.0 to 6.0

• Tungsten: 2.5 to 3.5

• Cobalt: Maximum 2.5

• Manganese: Maximum 0.50

• Vanadium: Maximum 0.35

• Silicon: Maximum 0.08

• Carbon: Maximum 0.010

• Phosphorus: Maximum 0.020

• Sulfur: Maximum 0.010

3. Physical Properties

• Density: 8.69 grams per cubic centimeter (0.314 pounds per cubic inch)

• Specific Gravity: 8.69

• Melting Range: 1357 to 1399 degrees Celsius

• Electrical Resistivity: 1.14 microhm-meters at room temperature

• Modulus of Elasticity: 206 GPa (29.9 x 10^3 ksi)

• Thermal Conductivity: 10.1 W/m K at 100 degrees Celsius

• Mean CTE: 12.4 x 10^-6 per degree Celsius (25 to 100 degrees Celsius)

4. Mechanical Properties (Solution Annealed Condition)

• Tensile Strength: Minimum 690 MPa (100 ksi) / Typical 760 to 820 MPa

• Yield Strength (0.2% offset): Minimum 310 MPa (45 ksi) / Typical 380 to 430 MPa

• Elongation at Break (in 2 inches): Minimum 45 percent

• Rockwell Hardness: Maximum 93 HRB / Typical 85 to 90 HRB

• Brinell Hardness: Maximum 219 HBW

• Charpy V-Notch Impact Energy: Exceptional impact toughness retained down to cryogenic temperatures

5. Thermal and Processing Parameters

• Solution Annealing Temperature: 1121 to 1177 degrees Celsius followed by rapid water quenching

• Hot Working Range: 950 to 1230 degrees Celsius (Avoid hot deformation below 950 degrees Celsius)

• Cold Working: Work hardens rapidly during cold deformation; requires intermediate annealing for heavy reductions

• Machinability: Low to moderate machinability due to high work-hardening rate; requires heavy-duty tooling, low speeds, and positive feeds

6. Corrosion Resistance Profile

• Superior overall corrosion resistance compared to Alloy C-276 in oxidizing aqueous environments due to higher chromium content

• Outstanding resistance to wet chlorine gas, nitric acid, and mixtures containing oxidizing acids with chloride ions

• Exceptional resistance to localized pitting, crevice attack, and intergranular corrosion in weld heat-affected zones

• Immune to chloride-induced stress corrosion cracking in severe chemical processing conditions

7. Manufacturing and Supply Specifications

• Available Formats: Hot Rolled Round Bars, Cold Finished Rods, Forged Round Blocks, Precision Ground Shafts

• Diameter Range: 3 mm to 500 mm (Standard Stocking: 6 mm to 300 mm)

• Supply Condition: Solution Annealed and Descaled / Bright Annealed / Precision Centerless Ground

• Bar Lengths: Fixed Lengths or Random Lengths from 2 meters up to 6 meters

• Surface Finishes: Black As-Forged, Turn-Peeled, Centerless Ground, Bright Polished

8. Primary Industrial Applications

• Chemical and petrochemical process equipment, reaction vessels, heat exchangers, and agitator shafts

• Flue gas desulfurization (FGD) systems, scrubber spray headers, fan housings, and dampers

• Pharmaceutical process hardware, reaction vessels, and high-purity piping systems

• Nuclear fuel reprocessing equipment, hazardous waste incineration systems, and pickling tanks

• Marine hardware, high-stress valve stems, and downhole oil and gas sour service components