ASTM A105 / ASME SA105 Carbon SteelForging Metallurgy & Specs
Forged Carbon Steel for Ambient and Elevated Temperature Piping Systems. 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 A105 / ASME SA105 Carbon Steel (UNS K03504 / 1.0460 / C22.8 / P250GH) offers a minimum tensile strength of 485 MPa min (70 ksi) and yield strength of 250 MPa min (36 ksi) with 137 – 187 HBW (Brinell) hardness. Manufactured by Jayesh Forge in Rajkot, Gujarat strictly up to 50 kg per piece, this alloy features Standard atmospheric resistance; requires protective coating or painting for outdoor/marine exposure. Tested per ASTM A388 Level II ultrasonic standards with EN 10204 3.1 MTC inspection.
ASTM A105 / ASME SA105 Carbon Steel Chemical Analysis (% by Weight)
| Element | Chemical Symbol | Minimum (%) | Maximum (%) | Specification Role |
|---|---|---|---|---|
| Carbon | C | — | 0.35% | Controls base tensile strength & core hardness |
| Manganese | Mn | 0.60% | 1.05% | 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 | 0.10% | 0.35% | Deoxidizer during melting; improves high-temperature scaling resistance |
| Copper | Cu | — | 0.40% | Improves corrosion resistance in sulfuric environments |
| 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 |
| 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 A105 / ASME SA105 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 – 900°C (2100°F – 1650°F)
Normalized at 900°C – 920°C, air cooled; or annealed per customer specification
Standard atmospheric resistance; requires protective coating or painting for outdoor/marine exposure
Machinability: 70% of AISI 1212 free-machining standard • Excellent weldability using standard SMAW/GTAW; preheat recommended for heavy wall sections >25mm
International Equivalent Material Grades
Forged Components Manufactured in A105
ASME B16.5 Weld Neck & Blind Flanges
Class 150# to 2500# forged flanges with EN 10204 3.1 MTC inspection.
Seamless Rolled Rings & Sleeves
Centrifugally balanced seamless forged rings for pressure vessel nozzles.
A105 Frequently Asked Technical Questions
Jayesh Forge specializes exclusively in precision closed-die forging and rolled rings strictly up to 50 kg per individual piece, ensuring rapid die-cycling and exact dimensional consistency.
Per ASME B16.5, ASTM A105 flanges over Class 300, or flanges over 4" NPS in Class 300, must be normalized, annealed, or quenched and tempered. Jayesh Forge provides normalized forgings with full furnace batch charts.
ASTM A105 is intended for ambient to elevated service (-29°C to 425°C), whereas ASTM A350 LF2 is a low-temperature impact-tested carbon steel rated down to -46°C (-50°F) with mandatory Charpy V-notch verification.
Related Industrial Metallurgy Specifications
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