Alloy 347H
Alloy 347H is a stabilized, austenitic, chromium, stainless steel containing columbium which allows for the elimination of carbide precipitation, and, consequently, intergranualr corrosion. 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. The addition of columbium also allows Alloy 347 to have excellent corrosion resistance, even superior to that of alloy 321H. 347H is the higher carbon composition form of Alloy 347 and demonstrates improved high temperature and creep properties.
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Gnee Steel (Tianjin) Co., Ltd. is one of the most professional manufacturers and suppliers of alloy 347h in China. With abundant experience, we warmly welcome you to wholesale customized alloy 347h from our factory. For price consultation, contact us.
Alloy 347H is a stabilized, austenitic, chromium, stainless steel containing columbium which allows for the elimination of carbide precipitation, and, consequently, intergranualr corrosion. 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. The addition of columbium also allows Alloy 347 to have excellent corrosion resistance, even superior to that of alloy 321H. 347H is the higher carbon composition form of Alloy 347 and demonstrates improved high temperature and creep properties.
Type 347H 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
347H Applications:
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
Fabrication and Heat Treatment
Machinability
Machining grade 347H stainless steel is slightly tougher than that of grade 304 steel. However, the hardenability of this steel can be minimized by the use of constant positive feeds and slow speeds.
Welding
Grade 347H stainless steel can be welded using most of the resistance and fusion methods. Oxyacetylene welding is not preferred for this steel.
Hot Working
Forging, upsetting and other hot work processes can be performed at 1149 to 1232°C (2100 to 2250°F). The grade 347H steel has to be water quenched and annealed to obtain maximum hardness.
Cold Working
Grade 347H stainless steel can be readily stamped, blanked, spun and drawn as it is quite tough and ductile.
Annealing
Grade 347H stainless steel can be annealed at temperature ranging from 1010 to 1193°C (1850 to 2000°F) and then quenched with water.
Hardening
Grade 347H stainless steel is unresponsive to heat treatment. The hardness and strength of the steel can be increased through cold working.
Chemical Composition (%) of 347H Stainless Steel Plate
| 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 Plate
| 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 Plate
| 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 193 GPa |
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