SS 347 / 347H Creep Resistant Stainless Steel Pipes
Columbium-stabilized austenitic pipes designed to resist intergranular attack and stress-rupture in temperatures up to 800°C.
ASTM A312 TP347 / TP347H Superheater & Refinery Pipe
Starlight Tubes produces premium ASTM A312 TP347 / 347H seamless and welded stainless steel pipes engineered for extreme thermal stresses and aggressive corrosive atmospheres. Stabilized with Niobium (Columbium), Grade 347 prevents sensitization during welding and extended high-temperature operations.
Our 347 and 347H pipes meet ASTM A312, ASTM A213, and ASME Section I / Section VIII boiler pressure vessel codes. Every lot undergoes solution annealing at 1050°C+, hydrostatic testing, and rigorous ultrasonic examination to guarantee flawless structural integrity.
Technical Specifications
ASTM / ASME CompliantTechnical Specifications — SS 347 / 347H
Certified chemical limits and mechanical tensile properties for ASTM A312 TP347
| Grade | C | Mn (max) | Si (max) | P (max) | S (max) | Cr | Ni | Nb (Columbium) |
|---|---|---|---|---|---|---|---|---|
| 347 | 0.08 max | 2.00 | 0.75 | 0.045 | 0.030 | 17.0-19.0 | 9.0-13.0 | 10x C min to 1.00 max |
| 347H | 0.04-0.10 | 2.00 | 0.75 | 0.045 | 0.030 | 17.0-19.0 | 9.0-13.0 | 8x C min to 1.10 max |
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Starlight Tubes delivers certified ASTM A312 TP347 pipes with complete mill certification, positive material identification, and global export packaging.
Frequently Asked Questions on Stainless Steel 347 / 347H Pipes
Key engineering, tolerance, and international compliance answers from our metallurgical quality desk.
Niobium forms stable niobium carbides, preventing chromium carbide precipitation along grain boundaries and ensuring maximum intergranular corrosion resistance in severe thermal services up to 800°C.
Request Project Quotation for Stainless Steel 347 / 347H Pipes
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