Stainless Steel 347 / ASTM A182 F347Forging Metallurgy & Specs
Niobium/Columbium-Stabilized Stainless Steel for Severe High-Heat Corrosive Lines. 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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Stainless Steel 347 / ASTM A182 F347 (UNS S34700 / 1.4550 / X6CrNiNb18-10) offers a minimum tensile strength of 515 MPa min (75 ksi) and yield strength of 205 MPa min (30 ksi) with 145 – 195 HBW max hardness. Manufactured by Jayesh Forge in Rajkot, Gujarat strictly up to 50 kg per piece, this alloy features Highly resistant to polythionic acid stress cracking in refinery hydrotreating units. Tested per ASTM A388 Level II ultrasonic standards with EN 10204 3.1 MTC inspection.
Stainless Steel 347 / ASTM A182 F347 Chemical Analysis (% by Weight)
| Element | Chemical Symbol | Minimum (%) | Maximum (%) | Specification Role |
|---|---|---|---|---|
| Carbon | C | — | 0.08% | Controls base tensile strength & core hardness |
| Chromium | Cr | 17.00% | 19.00% | Forms passive chromium oxide layer for oxidation & corrosion resistance |
| Nickel | Ni | 9.00% | 13.00% | Improves notch toughness, cryogenic ductility & hardenability |
| Niobium + Tantalum | Nb+Ta | 0.80% | 1.00% | Stabilizes against intergranular weld-decay corrosion |
| Manganese | Mn | — | 2.00% | Combines with sulfur, increases hardenability and hot workability |
| Silicon | Si | — | 1.00% | Deoxidizer during melting; improves high-temperature scaling resistance |
* 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.
Stainless Steel 347 / ASTM A182 F347 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
1180°C – 920°C
Solution treated at 1040°C – 1100°C; stabilization anneal at 870°C – 900°C
Highly resistant to polythionic acid stress cracking in refinery hydrotreating units
Machinability: 40% of AISI 1212 • Excellent with ER347 filler; Nb does not burn off across the arc as easily as Ti does
International Equivalent Material Grades
Forged Components Manufactured in SS 347
SS 347 Frequently Asked Technical Questions
During arc welding, Niobium transfers across the electric arc with significantly less oxidation loss than Titanium, resulting in higher retained stabilization in multipass weld roots and heavy forged wall sections.
Related Industrial Metallurgy Specifications
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