About 347 AMS 5512 Material
EN 1.4550 Stainless Steel AISI 347 is an austenitic steel containing niobium to enhance its resistance to intergranular corrosion and high temperature oxidation. AMS 5512 347 has excellent oxidation resistance between 600°C and 800°C, making it suitable for high temperature aerospace components and heat exchangers.
AMS 5512 Specifications and Standards
Our AISI 347 sheets and plates are fully certified to international engineering, aerospace, and pressure vessel standards:
Aerospace Material Specification: AMS 5512 (Sheet, Strip, and Plate)
ASTM Standards: ASTM A240 / ASTM A240M (Pressure Vessel & General Applications)
ASME Standards: ASME SA240 / ASME SA240M
Unified Numbering System: UNS S34700
European Standard: Werkstoff Nummer 1.4550 / EN 10088-2
Chemical Composition Table (wt. % per ASTM A240 & AMS 5512)
| Element | Specification Limit (%) |
| Carbon (C) | ≤ 0.08 |
| Chromium (Cr) | 17.00 – 19.00 |
| Nickel (Ni) | 9.00 – 13.00 |
| Columbium + Tantalum (Cb + Ta) | 10 × C Min / 1.00 Max |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 0.75 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Iron (Fe) | Remainder |
Fabrication, Welding & Heat Treatment
Welding Characteristics
AISI 347 stainless steel sheet exhibits excellent weldability across all standard fusion and resistance methods (TIG/GTAW, MIG/GMAW, SMAW). Unlike standard 304 stainless steel, AMS 5512 sheets do not require post-weld solution annealing when used in aggressive corrosive media. To maintain full stabilization across the weld zone, matching filler metals such as E347 / ER347 are highly recommended.
Heat Treatment & Annealing
Solution Annealing Range: 1010°C to 1193°C (1850°F to 2180°F), followed by a rapid water quench or air cool depending on section thickness.
Note: This material cannot be hardened via thermal treatment; it increases strength solely through cold working.
Industrial Applications of AMS 5512 Sheets
Thanks to its stabilization properties, AISI 347 sheets are extensively specified for components operating intermittently or continuously between 800°F and 1500°F:
Aerospace Engine Components: Exhaust collector rings, jet engine thrust reversers, manifold systems, and fire walls.
Chemical & Refining Infrastructure: Polythionic acid environments, fluid catalytic cracking units (FCCU), and heat exchangers handling hot sour crude.
Power Generation: High-pressure steam piping systems, boiler tubes, and superheater components.
Surface Finishes & Processing Options
Depending on the final application-whether it is high-temperature aerospace shielding or aesthetic architectural furnace cladding-the surface condition of the AMS 5512 sheet is critical. HT PIPE provides these sheets in several standardized industry finishes:
No. 1 Finish: Hot-rolled, annealed, and descaled (pickled). This yields a dull, slightly rough surface suitable for industrial or aerospace components where high-temperature performance matters more than cosmetic appearance.
2B Finish: Cold-rolled, heat-treated, pickled, and given a final light pass through polished rolls. This is a smooth, moderately reflective finish that serves as the perfect baseline for easy fabrication and stamping.
Bright Annealed (BA): Cold-rolled and bright annealed in a highly controlled, oxygen-free protective atmosphere. This produces a highly reflective, mirror-like finish preferred for heat reflectors and contamination-sensitive chemical apparatus.
Custom Processing: We offer precision laser profile cutting, waterjet cutting for thick plates, and custom leveling to meet tight flatness requirements before your stamping or forming operations.
