Stainless Steel 347H / UNS S34709 / 1.4961

347H is an austenitic chromium steel containing columbium often used in refineries, high temperature chemical processing, and high temperature steam service. This columbium bearing steel not sensitive to intergranular corrosion after heating within the range of carbide precipitation but elevated properties may be achieved through cold reduction.
 

The "H" in 347H stands for "high carbon" content. This variety of stainless steel has higher amounts of carbon than standard 347 stainless steel, with increased tensile strength and creep resistance at elevated temperatures. Due to its higher carbon content, this type of stainless steel provides better stress rupture properties than the standard version. It also offers excellent resistance to oxidation in intermittent service up to 1600F and continuous service up to 1700 degrees F.

Physical properties

Density: 7.98 g/cm3

• High temperature gaskets

• Rocket engine parts

• Aircraft collector rings

• Exhaust manifolds

• Chemical production equipment

• Pollution control equipment

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