ASTM A182 F22 Class 3 High-Temp Alloy SteelForging Metallurgy & Specs
2.25Cr-1Mo High-Temperature Creep & Hydrogen Attack Resistant Steel. Hot-forged and precision-machined in Rajkot, Gujarat strictly up to 50 kg max piece weight with 100% Optical Emission Spectrometry (OES) PMI testing and EN 10204 3.1 MTC compliance.
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ASTM A182 F22 Class 3 High-Temp Alloy Steel (UNS K21590 / 1.7380 / 10CrMo9-10) offers a minimum tensile strength of 515 MPa min (75 ksi) and yield strength of 310 MPa min (45 ksi) with 156 – 207 HBW hardness. Manufactured by Jayesh Forge in Rajkot, Gujarat strictly up to 50 kg per piece, this alloy features Excellent resistance to high-temperature H2S and hydrogen attack up to 600°C. Tested per ASTM A388 Level II ultrasonic standards with EN 10204 3.1 MTC inspection.
ASTM A182 F22 Class 3 High-Temp Alloy Steel Chemical Analysis (% by Weight)
| Element | Chemical Symbol | Minimum (%) | Maximum (%) | Specification Role |
|---|---|---|---|---|
| Carbon | C | 0.05% | 0.15% | Controls base tensile strength & core hardness |
| Manganese | Mn | 0.30% | 0.60% | Combines with sulfur, increases hardenability and hot workability |
| Phosphorus | P | — | 0.04% | Restricted to prevent temper embrittlement |
| Sulfur | S | — | 0.04% | Strictly controlled for cleaner grain flow and micro-cleanliness |
| Silicon | Si | — | 0.50% | Deoxidizer during melting; improves high-temperature scaling resistance |
| Chromium | Cr | 2.00% | 2.50% | Forms passive chromium oxide layer for oxidation & corrosion resistance |
| Molybdenum | Mo | 0.87% | 1.13% | Prevents chloride pitting and enhances high-temperature creep strength |
* Ladle chemical analysis verified using optical emission spectrometer (OES) calibrated to NIST certified reference materials. Full chemical results recorded on EN 10204 3.1 MTC.
ASTM A182 F22 Class 3 High-Temp Alloy Steel Mechanical Properties
Ultimate breaking stress threshold
Elastic deformation limit
Plastic ductility before rupture
Surface indentation resistance
Cross-sectional necking ductile ratio
Dynamic fracture energy absorption
Thermal Cycle & Machining Parameters
1150°C – 900°C (2100°F – 1650°F)
Normalized at 920°C – 980°C and tempered at 675°C min; or quenched & tempered
Excellent resistance to high-temperature H2S and hydrogen attack up to 600°C
Machinability: 52% of AISI 1212 • Requires 200°C – 250°C preheat and mandatory PWHT at 680°C – 720°C to relieve weld residual stresses
International Equivalent Material Grades
Forged Components Manufactured in A182 F22
Hydrocracker Heavy Forged Flanges
Class 600# to 2500# weld neck flanges for hydrogen services.
A182 F22 Frequently Asked Technical Questions
The higher Chromium (2.25%) and Molybdenum (1.0%) content in F22 provides significantly greater resistance to High-Temperature Hydrogen Attack (HTHA) and higher allowable design stresses above 540°C (1000°F).
Related Industrial Metallurgy Specifications
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