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.
