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Alloy 347H is stabilized by the additions of chromium and tantalum and offers higher creep and stress rupture properties than alloy 304 and 304L which may also be used for exposures where sensitization and intergranualr corrosion are of concern.
Type 347H Major Design Features
1, Similar resistance and corrosion protection as Alloy 304
2, Used for heavy welded equipment when annealing is not possible
3, Good oxidation resistance, on par with most other austenitic stainless steels
4, Higher carbon allows for better high temperature creep properties
347H Applications
1, Boiler tubes and casings
2, Oil and gas refinery piping
3, Radiant superheaters
4, High-pressure steam pipes
5, Heat exchanger tubes
6, Cabin heaters
7, Heavy wall-welded equipment
8, Aircraft exhaust stacks and collector rings
Product Parameters
Chemical Composition (%) of 347H Stainless Steel | ||||||
Chromium | Nickel | Carbon | Silicon | Manganese | Phosphorus | Sulfur |
17.00-19.00 | 9.00-13.00 | 0.04-0.10 | 0.75 | 2.00 max | 0.045 max | 0.03 max |
Mechanical Properties of 347H Stainless Steel | |||||
Yield Strength 0.2% Offset | Ultimate Tensile Strength | Elongationin 2 in. | Hardness | ||
psi (min.) | (MPa) | psi (min.) | (MPa) | % (min.) | (max.) |
30,000 | 205 | 75,000 | 515 | 40 | 201 Brinell |
Physical Properties of 347H Stainless Steel | ||||
Density (lb. / cu. in.) | Specific Gravity | Specific Heat (Btu/lb Deg F – [32-212 Deg F]) | Melting Range | Modulus of Elasticity |
0.288 | 7.96 | 0.12 | 2550 – 2635°F | 28.0 x 106psi |
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