Valve Material Reference
ASTM A182 F347 Valve
Stabilised 347 Stainless Steel (Forged F347)ASTM A182 Grade F347 is a niobium (columbium)-stabilised austenitic stainless steel in forged form.
Form
Forged
Max Temp
+816°C (+1500°F)
Min Temp
−196°C (−321°F)
Category
Stainless Steel
Chemical Composition — ASTM A182 F347
Temperature Range
−196°C to +816°C (−321°F to +1500°F) — upper limit in clean environments
Maximum Temperature
+816°C (+1500°F)
Minimum Temperature
−196°C (−321°F)
Equivalent Grades — ASTM A182 F347
| Standard | Equivalent Grade |
|---|---|
| ASTM | A182 F347 (forged) / A351 CF8C (cast equivalent) |
| UNS | S34700 |
| EN | 1.4550 (X6CrNiNb18-10) |
| BS | 347S17 |
| JIS | SUS347 |
Suitable Services
Nuclear power (BWR/PWR) — piping valves in reactor coolant auxiliary systems; F347 resists sensitisation in high-temperature radioactive water service
Ethylene cracker and catalytic reformer — sustained temperatures above 450°C where 316L would sensitise
Hot hydrogen service (hydroprocessing) — niobium stabilisation prevents intergranular attack under Nelson curve conditions
Aerospace and high-temperature industrial valves — gas turbine auxiliary valves
Heat exchanger and furnace valves — repeated thermal cycling without weld sensitisation
Not Suitable For
Chloride environments at elevated temperature — sensitisation is not the primary corrosion mechanism; use duplex or Hastelloy
Strong mineral acids — nickel alloys required
Service above +816°C — refractory alloys or Inconel 625/718 required
When post-weld heat treatment can be reliably applied — 304L or 316L may be more economical
Valve Body Applications
Valve bodies and bonnets in nuclear power BWR/PWR primary loop and secondary systems
High-temperature process valve bodies in ethylene cracker and catalytic reformer units
Valve flanges and end-piece forgings for elevated-temperature piping (ASME B31.1 / B31.3)
Trim Applications
Stems, back-seat bushings, and body-bonnet studs in high-temperature stainless valves
Cage and seat ring trim for globe control valves in high-temperature service
Typical Valve Types in ASTM A182 F347
Gate valves
Globe valves
Check valves
Ball valves
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We supply ASTM A182 F347 (Stabilised 347 Stainless Steel (Forged F347)) gate valves, globe valves, ball valves, check valves, and more. Full certification documentation — EN 10204 3.1/3.2 MTCs, hydro test certs — as standard.