347H/1.4961/X8CrNiNb16-13/S3470 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 unique
properties it is used in a variety of application 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
Chemical production
equipment
Along with a higher level of
carbon then regular Type 347, Type 347H stainless steel has a unique chemical
composition that includes the follow: