Stainless Steel 347 is composed of about 17–19% chromium and 9–13% nickel, with niobium included to prevent carbide precipitation during welding and high-temperature exposure. This stabilized composition ensures excellent resistance to intergranular corrosion and good oxidation resistance. Typically, SS 347 forgings provide a tensile strength of around 515 MPa and a yield strength close to 205 MPa, along with commendable ductility and impact toughness. The forging process further boosts fatigue resistance, structural integrity, and load-bearing capacity under cyclic loads and thermal stress.
| Standard | ASTM A182, ASME SA182 |
| Specification | DIN, ASTM, BS and all International Standards |
| Flat bar blocks | up to 27″ width and 15,000 lbs. |
| Cylinders and sleeves | up to 50″ maximum O.D. and 65″ maximum length |
| Discs and hubs | up to 50″ diameter and 20,000 lbs. |
| Rolled, hand forged or mandrel forged rings | up to 84″ maximum O.D. and 40″ maximum length |
| Rounds, shafts and step shafts | up to 144″ maximum length and 20,000 lbs. |
| Forging Types | Impression Die Forging, Open Die Forging, Seamless Rolled Forging, Hot Forging, Cold Forging, Open die hammer forging, Impression die drop forging, Closed Die Forging, Press Forging, Upset Forging, Compression Forging, Swaging, Rotary Forging, Roll forging. |
Stainless Steel 347 forgings have limitations in extreme temperatures above 1600°F (870°C), susceptibility to stress corrosion cracking in chloride environments, and reduced formability compared to some other stainless steel grades.
The forging temperature range for Stainless Steel 347 is typically between 2100°F (1149°C) and 2200°F (1204°C). It ensures optimal grain structure and mechanical properties for high-performance applications.
Stainless Steel 347 forgings require minimal maintenance, primarily periodic cleaning to remove contaminants. Regular inspection for corrosion or wear is recommended, along with ensuring proper lubrication for moving parts in harsh environments.
Stainless Steel 347 Forgings find extensive use in high-temperature, high-pressure applications and welded structures where corrosion resistance is vital. Common applications include components for heat exchangers, boiler parts, pressure vessels, furnace hardware, exhaust systems, and refinery piping fittings. In the petrochemical and power generation industries, SS 347 forgings are utilized for valve bodies, flanges, expansion joints, and structural supports. They are also employed in chemical processing equipment and thermal processing systems. Their outstanding weldability, oxidation resistance, and mechanical stability make them a go-to choice for demanding environments.
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
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