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347 / 347H Stainless Steel

347 SS is a columbium stabilized austenitic stainless steel which has general corrosion resistance and roughly better resistance in strong oxidizing conditions than 321.The alloy has good oxidation resistance and creep strength to 8167 degree Celsius. It also has good low temperature toughness.

Typical Composition:
Chromium: 17% to 19%
Nickel: 9% to 13% max
Silicon: 0.75% max
Carbon: 0.08% max
Phosphorus: 0.045% max
Sulfur: 0.030% max
Manganese 2.00% max
Columbium & 10x(C+N) min-1.00% max
Tantalum:
Iron: Balance

347H stainless steel is the higher carbon version (0.04 to 0.10%)of 347 ss. It provides improved creep resistance and higher strength at temperatures above 537°C.

Typical Composition of 347H:
Chromium: 17% to 19%
Nickel: 9% to 13% max
Silicon: 0.75% max
Carbon: 0.04% min-0.10% max
Phosphorus: 0.045% max
Sulfur: 0.030% max
Manganese 2.00% max
Columbium & 8 x(C+N) min-1.00% max
Tantalum:
Iron: Balance

Due to its high resistance to continuing heat and corrosion it is recommended for power generation, chemical processing and other high heat applications.

Common Applications:

Heavy duty exhaust systems
Chemical processes with high temperatures
Heat exchanger tubes
Aerospace components
High temperature & pressure steam pipes
Oil Refining equipment
Boiler tubes
Radiant heaters

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