Round ASTM A213 TP347H Stainless Steel Seamless Tube
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ASTM A213 TP347H Stainless Steel Seamless Tube Chemical Composition
| Grade | 347 | 347H | 347HFG |
| UNS Designation | S34700 | S34709 | S34710 |
| Carbon (C) Max. | 0.08 | 0.04–0.10 | 0.06–0.10 |
| Manganese (Mn) Max. | 2 | 2 | 2 |
| Phosphorous (P) Max. | 0.04 | 0.04 | 0.04 |
| Sulphur (S) Max. | 0.03 | 0.03 | 0.03 |
| Silicon (Si) Max. | 0.75 | 0.75 | 0.75 |
| Chromium (Cr) | 17.0–20.0 | 17.0–20.0 | 17.0–20.0 |
| Nickel (Ni) | 9.0–13.0 | 9.0–13.0 | 9.0–13.0 |
| Molybdenum (Mo) | — | — | |
| Nitrogen (N) | — | — | — |
| Iron (Fe) | Bal. | Bal. | Bal. |
| Other Elements | Cb+Ta=10xC-1.0 | Cb+Ta=8xC-1.0 | Nb+Ta=8xC-1.0 |
ASTM A213 TP347H Stainless Steel Seamless Tube Physical Properties
| In the Annealed Condition at -20°F to +100°F |
| Alloy | UNS Design | Density kg/dm³ | Modulus of Elasticity (x106 psi) | Mean Coefficient of Thermal Expansion (IN./IN./°F x 10-6) | Thermal Conductivity (BTU-in/ft2-h-°F) |
|
| 347 | S34700 | 7.98 | 29 | 9.2 | — |
| 347H | S34709 | 7.98 | 29 | 9.2 | — |
| 347HFG | S34710 | — | 29 | 9.2 | — |
ASTM A213 TP347H Stainless Steel Seamless Tube Mechanical
Properties
| In the Annealed Condition at -20°F to +100°F |
| | | | Tensile Strength | Tensile Strength | Yield Strength | Yield Strength | | | |
| Alloy | UNS | Spec | MPa | ksi | MPa | ksi | Elongation in 2 inches (min.) % | Grain Size Req. | Harndess HBW |
| 347 | S34700 | ASTM A213 | 515 | 75 | 205 | 30 | 35 | — | 192 |
| 347H | S34709 | ASME SA 213 | 515 | 75 | 205 | 30 | 35 | 7 or coarser | 192 |
| 347HFG | S34710 | — | 550 | 80 | 205 | 30 | 35 | 7 or coarser | 192 |
Why 347h SS is used for Chemical Processing?
The grade 347 is specific austenitic stainless steel made for
repeated intermittent exposure to temperatures above 800 degrees
Celsius. These are modifications of 304 stainless steel. They are
similar to the 321 grade in some mechanical properties but
different in that it has columbium in the composition. The material
is corrosion resistant to most corrosive media in medium to high
temperatures.
This is an important aspect required at chemical processing. The
material has minimum yield strength of 205MPa and the minimum
tensile strength at 515MPa. This allows the material to withstand
high pressure at temperatures above 850 degrees Celsius. The pipes
and components also have a good elongation and high hardness. The
304 material can undergo intergranular corrosion above temperatures
850 F. The 347H has a higher carbon content and heat resistant so
that it can perform in this temperature range.
The combination of the pressure containment capacities, the
strength, hardness, heat resistance and corrosion resistance make
it applicable for chemical processing. These properties also make
the material used in other high corrosive, high heat applications
such as the boiler tubes and casings, radiant super heaters, heat
exchanger tubes, oil and gas refineries and aircraft exhaust
stacks.
ASTM A213 TP347H Stainless Steel Seamless Tube Application Industries
- Off-Shore Oil Drilling Companies
- Power Generation
- Petrochemicals
- Gas Processing
- Specialty Chemicals
- Pharmaceuticals
- Pharmaceutical Equipment
- Chemical Equipment
- Sea Water Equipment
- Heat Exchangers
- Condensers
- Pulp and Paper Industry
ASTM A213 TP347H Stainless Steel Seamless Tube Test Certificates
- EN 10204/3.1B,
- Raw Materials Certificate
- 100% Radiography Test Report
- Third Party Inspection Report, etc
Material Testing:
- Mechanical Testing Such as Tensile of Area
- Hardness Test
- Chemical Analysis – Spectro Analysis
- Positive Material Identification – PMI Testing
- Flattening Test
- Micro and MacroTest
- Pitting Resistance Test
- Flaring Test
- Intergranular Corrosion (IGC) Tes
