347 and 347H stainless steel is common in the petroleum refining industries. Alloy 347 and 347H stainless steel is used to make radiant superheaters, boiler tubes, high pressure steam pipe, and general refinery piping. They are also used for heavy-duty exhaust systems and manifolds.
| Grade | Chemical Component % | ||||||||||
| C | Cr | Ni | Mn | P | S | Mo | Si | Cu | N | Other | |
| 347 | ≤0.08 | 17.00-19.00 | 9.00-13.00 | ≤2.00 | ≤0.035 | ≤0.030 | - | ≤1.00 | - | - | Nb≥10*C% |
| 347H | 0.04-0.1 | 17.00-19.00 | 9.00-13.00 | ≤2.00 | ≤0.035 | ≤0.030 | - | ≤1.00 | - | - | Nb≥10*C% |
Corrosion Resistance:
Exhibits oxidation resistance similar to other austenitic stainless steels
Preferred over grade 321 for aqueous and other low temperature environments
Better high temperature properties than 304 or 304L
Good resistance to sensitization in high temperature environments
Suited for heavy welded equipment that cannot be annealed
Used for equipment operated between 800 to 150°F (427 TO 816°C)
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