SS347
Similar to SS321, stainless steel 347(SS347) is an austenitic stainless steel with deliberate addition of tantalum(Ta) and niobium(Nb) to the basic stainless steel 304(SS304). The Nb+Ta addition reduces the sensitization of carbide precipitation during welding process which also improves its resistance to intergranular corrosion. The applicable temperature range of SS347 is from 427°C to 899°C. The SS347 is primarily used for high-temperature gaskets, expansion joints, exhaust manifolds, superheaters & heat exchangers, boilers and chemical piping components, etc.
ASTM A213 TP347 seamless pipes, O.D=219mm, W.T=30mm.
1. UNS Designation & International Equivalent
| Type | UNS | JIS | EN/DIN | EN/BS | EN/NF | ISO | GB | GOST |
|---|---|---|---|---|---|---|---|---|
| 347 | S34700 | SUS347 | X6CrNiNb18-10 | 347S31 | X6CrNiNb18-10 | 16 | 0Cr18Ni11Nb | 08KH18H12B |
2. Product Forms and Standards
| Product Forms | Material Standards |
|---|---|
| Plates, Sheets & Strips | ASTM A240 |
| Billets, Bars & Rods | ASTM A276, A314, A479 |
| Forgings(Flanges & Fittings) | ASTM A182, A473. |
| Wires | ASTM A313, A580. |
| Seamless and Welded Pipes | ASTM A312, A358, A213, A249, A813, A814, A632 |
| Wrought Pipe Fittings | ASTM A403 |
3. Physical Properties of SS347
ASTM A182 F347 ring gaskets, R24 made to ASME B16.20.
| The Physical Properties of SS347 | |
|---|---|
| Density(lb/cu. in.) | 0.29 |
| Specific Gravity | 8.03 |
| Specific Heat(Btu/lb/Deg F) | 0.12 |
| Electrical Resistivity(microhm-cm) | 438 |
| Melting Point(Deg F) | 2600 |
5. Chemical Composition of SS347
| The Chemical Composition of SS347, % | |
|---|---|
| Carbon | ≤0.08 |
| Manganese | ≤2.00 |
| Phosphorus | ≤0.045 |
| Sulfur | ≤0.030 |
| Silicon | ≤0.75 |
| Chromium | 17.0-19.0 |
| Nickel | 9.0-13.0 |
6. Mechanical Properties of SS347
| Tensile Strength, min. | Yield Strength, min. | Elongation | Hardness | |||
|---|---|---|---|---|---|---|
| ksi | Mpa | ksi | Mpa | % | HBW | Rockwell |
| 75 | 515 | 30 | 205 | 40 | 201 | 92HRBW |
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