ASTM A182 F11 Class 2 Low-Alloy Boiler SteelForging Metallurgy & Specs
1.25Cr-0.5Mo Elevated Temperature Creep-Resistant Forgings for Power Boilers. 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 F11 Class 2 Low-Alloy Boiler Steel (UNS K11572 / 1.7335 / 13CrMo4-5) offers a minimum tensile strength of 485 MPa min (70 ksi) and yield strength of 275 MPa min (40 ksi) with 143 – 207 HBW hardness. Manufactured by Jayesh Forge in Rajkot, Gujarat strictly up to 50 kg per piece, this alloy features Resistant to hydrogen embrittlement and high-temperature steam oxidation. Tested per ASTM A388 Level II ultrasonic standards with EN 10204 3.1 MTC inspection.
ASTM A182 F11 Class 2 Low-Alloy Boiler Steel Chemical Analysis (% by Weight)
| Element | Chemical Symbol | Minimum (%) | Maximum (%) | Specification Role |
|---|---|---|---|---|
| Carbon | C | 0.10% | 0.20% | Controls base tensile strength & core hardness |
| Manganese | Mn | 0.40% | 0.65% | 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% | 0.80% | Deoxidizer during melting; improves high-temperature scaling resistance |
| Chromium | Cr | 1.00% | 1.50% | Forms passive chromium oxide layer for oxidation & corrosion resistance |
| Molybdenum | Mo | 0.44% | 0.65% | 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 F11 Class 2 Low-Alloy Boiler 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 900°C – 950°C and tempered at 620°C min; or annealed
Resistant to hydrogen embrittlement and high-temperature steam oxidation
Machinability: 58% of AISI 1212 • Requires 150°C – 200°C preheat and Post-Weld Heat Treatment (PWHT) at 650°C – 700°C
International Equivalent Material Grades
Forged Components Manufactured in A182 F11
High-Temperature Power Piping Flanges
Class 300# to 2500# weld neck flanges for superheated steam headers.
A182 F11 Frequently Asked Technical Questions
ASTM A182 F11 Class 2 is ASME Section II-D code-approved for continuous pressurized service up to 593°C (1100°F) before significant graphitization or creep deformation occurs.
Related Industrial Metallurgy Specifications
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