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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.
Grade | C | Mn≤ | P≤ | S≤ | Si≤ | Cr | Ni | Fe | Nb |
347H | 0.04-0.10 | 2.0 | 0.045 | 0.03 | 0.75 | 17.0-19.0 | 9.0-13.0 | 62.38-73.64 | 8*C-1.0 |
Grade | Tensile, min, ksi[MPa] | Yield, min, ksi[MPa] | Elongation, %(min) | Hardness, HB（max） |
347H | 75【515】 | 30【205】 | 40 | 201 |
Density: 7.98 g/cm3
Stainless steel 347H Equivalent Grades
STANDARD | WERKSTOFF NR. | UNS | JIS | EN |
347H | 1.4961 | S34709 | SUS347H | X6CrNiNb18-12 |
Stainless steel 347H ASTM Specification
Pipe, | Tube, | Pipe , | Sheet/Plate | Bar /Rod | Forging /Flange | BW Fittings |
ASTM A312 | ASTM A269/ASTM 249 | ASTM A213 | ASTM A240 | ASTM A276/A479 | ASTM A182 | ASTM A403 |
Stainless steel 347H Application：
High temperature gaskets
Rocket engine parts
Aircraft collector rings
Exhaust manifolds
Chemical production equipment
Pollution control equipment
