ASTM A213 / ASME SA213 TP347H Stainless Steel Seamless Tube Heat Exchanger Tube
Cold-finished seamless austenitic stainless steel tube conforming to ASME SA213 / ASTM A213, Grade TP347H (UNS S34709), stabilized with Niobium, with a controlled carbon range of 0.04–0.10% for enhanced creep rupture strength. Manufactured in the solution-annealed condition, with dimensions, tolerances, and testing per ASTM A213, suitable for high-temperature heat exchanger, superheater, and boiler pressure-part service.
Equivalent Grades of ASTM A213 TP347H / EN 1.4961 Stainless Steel Seamless Tube Heat Exchanger Tube
| Stainless Steel |
Tradename |
UNS no. |
Werkstoff No. |
| SS347H |
TP347H |
S34709 |
1.4961 |
Chemical Composition % of ASTM A213 TP347H / EN 1.4961 Stainless Steel Seamless Tube Heat Exchanger Tube
| C |
Mn
max.
|
P
max.
|
S
max.
|
Si
max.
|
Ni |
Cr |
Mo |
Ti |
Nb |
Ta |
Ni |
Other |
| 0.04-0.10 |
2.00 |
0.045 |
0.03 |
0.75 |
9.0-13.0 |
17.0-19.0 |
... |
... |
8×C-1.10 |
... |
... |
... |
Mechanical Properties of ASTM A213 TP347H / EN 1.4961 Stainless Steel Seamless Tube Heat Exchanger Tube
|
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 |
| 347H |
S34709 |
ASME SA 213 |
515 |
75 |
205 |
30 |
35 |
7 or coarser |
192 |
Compared to other grades of steel, 347H has certain advantages:
1. High temperature resistance: Steel 347H exhibits excellent heat resistance, making it suitable for applications where materials are subjected to elevated temperatures.
2. Enhanced corrosion resistance: This grade contains a higher level of chromium and columbium (niobium) than standard austenitic stainless steels. As a result, 347H offers improved resistance to corrosion, especially in environments with high concentrations of acids, such as sulfuric, acetic, and phosphoric acids.
3. Weldability: Steel 347H is known for its good weldability. It can be easily welded using standard welding techniques, such as TIG (Tungsten Inert Gas) or MIG (Metal Inert Gas) welding, without experiencing significant issues like sensitization or cracking.
4. Stability against intergranular corrosion: One of the primary advantages of 347H is its ability to resist intergranular corrosion, which can occur in certain environments or after exposure to high temperatures. This stability is due to the addition of columbium, which forms carbides that inhibit the precipitation of chromium carbides, thus preventing sensitization and intergranular corrosion.
5. Versatility: Steel 347H finds utility in a wide range of applications, including chemical processing, oil and gas industry, food processing, and high-temperature environments like furnace equipment and heat exchangers.
Application
- Off-Shore Oil Drilling Companies
- Power Generation
- Petrochemicals
- Gas Processing
- Specialty Chemicals
- Chemical Equipment
- Sea Water Equipment
- Heat Exchangers
- Condensers
- Pulp and Paper Industry
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