Stainless Steel Alloy 347H

Type 347H is a high-carbon austenitic chromium stainless steel. Found in applications that demand high-temperature resistance, other major design features include:

• Similar resistance and corrosion protection as Alloy 304
• Used for heavy welded equipment when annealing is not possible
• Good oxidation resistance, on par with most other austenitic stainless steels
• Higher carbon allows for better high-temperature creep properties

Due to Type 347H’s unique properties, it is used in a variety of applications in many of today’s critical industries:

• Boiler tubes and casings
• Oil and gas refinery piping
• Radiant superheaters
• High-pressure steam pipes
• Heat exchanger tubes
• Cabin heaters
• Heavy wall-welded equipment
• Aircraft exhaust stacks and collector rings

Along with a higher level of carbon than regular Type 347. Type 347H stainless steel has a unique chemical composition that includes the following:

• Fe balance
• Cr 17-20%
• Ni 9-13%
• C 0.04-0.08%
• Mn 0.5-2.0%
• S 0.30% max
• Si 0.75% max
• P 0.03% max
• Cb/Ta 1% max

All of the Type 347H stainless steel which is supplied by Yuze Metal, meets the leading international standards including ASTM, ASME, EN, and DIN.

Common Surfaces

Stainless Steel Standards Comparison Table