ASTM A350 LF2 Class 1 Carbon SteelForging Metallurgy & Specs
Low-Temperature Impact-Tested Forged Carbon Steel (-46°C / -50°F). 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 A350 LF2 Class 1 Carbon Steel (UNS K03011 / 1.0566 / TStE 355 / P355NL1) offers a minimum tensile strength of 485 – 655 MPa (70 – 95 ksi) and yield strength of 250 MPa min (36 ksi) with 197 HBW max (NACE MR0175 compliant) hardness. Manufactured by Jayesh Forge in Rajkot, Gujarat strictly up to 50 kg per piece, this alloy features Standard atmospheric; certified to NACE MR0175 / ISO 15156 for sour gas when hardness ≤22 HRC (197 H. Tested per ASTM A388 Level II ultrasonic standards with EN 10204 3.1 MTC inspection.
ASTM A350 LF2 Class 1 Carbon Steel Chemical Analysis (% by Weight)
| Element | Chemical Symbol | Minimum (%) | Maximum (%) | Specification Role |
|---|---|---|---|---|
| Carbon | C | — | 0.30% | Controls base tensile strength & core hardness |
| Manganese | Mn | 0.60% | 1.35% | 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 | 0.15% | 0.30% | Deoxidizer during melting; improves high-temperature scaling resistance |
| Nickel | Ni | — | 0.40% | Improves notch toughness, cryogenic ductility & hardenability |
| Chromium | Cr | — | 0.30% | Forms passive chromium oxide layer for oxidation & corrosion resistance |
| Molybdenum | Mo | — | 0.12% | Prevents chloride pitting and enhances high-temperature creep strength |
| Copper | Cu | — | 0.40% | Improves corrosion resistance in sulfuric environments |
| Vanadium | V | — | 0.08% | Grain refiner; precipitates secondary carbonitrides for 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 A350 LF2 Class 1 Carbon 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 – 880°C (2100°F – 1615°F)
Normalized, Normalized & Tempered, or Quenched & Tempered (water/oil quench from 880°C)
Standard atmospheric; certified to NACE MR0175 / ISO 15156 for sour gas when hardness ≤22 HRC (197 HBW)
Machinability: 65% of AISI 1212 • Excellent using low-hydrogen electrodes (E7018-1) with preheat control to prevent cold cracking
International Equivalent Material Grades
Forged Components Manufactured in A350 LF2
Low-Temperature Forged Flanges
Class 150# to 1500# weld neck and blind flanges with certified Charpy impact values.
Forged Branch Tees & Crosses
High-pressure forged branch tees for subsea manifolds and arctic gas headers.
A350 LF2 Frequently Asked Technical Questions
ASTM A350 LF2 Class 1 requires Charpy V-notch impact testing at -46°C (-50°F), achieving at least 20 Joules (15 ft-lbf) minimum average across 3 specimens with no single specimen below 16 Joules.
Yes, when provided in the normalized and tempered condition with hardness certified below 197 HBW (22 HRC), Jayesh Forge LF2 forgings comply with NACE MR0175 / ISO 15156.
Related Industrial Metallurgy Specifications
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