347H Austenitic Stainless Steel

ASME/SA-312 TP 316L

347H boasts excellent corrosion resistance, weldability, and heat resistance. It is a highly stable stainless steel that maintains good intergranular corrosion resistance even when the temperature reaches 427-816℃ and chromium carbide precipitates. The advantages of 347 stainless steel in high-temperature operation also rely on its superior mechanical properties. Compared to 304 and 304L, 347H stainless steel exhibits better creep and stress cracking resistance, allowing these stable alloys to meet ASME boiler specifications and pressure vessel codes at higher temperatures.

347H Stainless Steel Chemical Composition

C:0.04-0.10

Cr：17.0-19.0

Ni：9.0-13.0

Nb：0.80-1.00

Si：≤0.75

Mn：≤2.00

347H Stainless Steel Mechanical Properties

Tensile Strength: ≥515

Yield Strength: ≥205

Stretch Ratio: ≥40

Applications of 347H Stainless Steel

347H stainless steel is used for large boiler superheaters, reheaters, steam pipes, and heat exchanger components in petrochemical industries.