ASTM A213 TP347 1.4550 Seamless Tube For Boiler And Heat Exchanger
TP347 stainless steel is a type of austenitic stainless steel. It improves its resistance to intergranular corrosion in high temperature environments by adding a certain amount of stabilizing elements (such as niobium and titanium). This stainless steel not only inherits the excellent corrosion resistance, good processability and weldability of austenitic stainless steel, but also significantly enhances its strength and stability under high temperature conditions due to the addition of stabilizing elements. It is especially suitable for working environments with temperatures up to 800°C.
The reason why TP347 seamless stainless steel pipe stands out among many stainless steel materials is mainly due to its performance advantages in the following aspects:
first, its excellent high temperature resistance enables it to maintain a stable working state under extremely high temperature conditions;
second, its good corrosion resistance, whether it is to oxidizing media or reducing media, shows excellent resistance;
third, its excellent resistance to stress corrosion cracking effectively extends the service life of the pipeline system;
finally, its good processability and weldability make the material more flexible and changeable in the processing and manufacturing process, meeting the use requirements under different working conditions.
Heat Treatment Requirements:
| Grade | UNS | Heat Treat Type | Austenitizing/ Solutioning Temperature, min or range °F [°C] | Cooling Media | ASTM Grain Size No. B |
| Designation |
| TP347 | S34700 | Solution treatment | 1900 °F [1040 °C] | water or another rapid cool | . . . |
| TP347H | S34709 | Solution treatment | cold worked:2000 | water or another rapid cool | 7 |
| [1100] hot rolled: 1925 [1050]H |
Tensile Requirements:
| Grade | Tensile Strength, Min ksi [MPa] | Yield strength, min ksi [MPa] | Elongation in 2 in. or 50 mm, min, %A, B | Hardness, Max |
| Brinell/Vickers | Rockwell |
| TP347 | 75 [515] | 30 [205] | 35 | 192HBW/200Hv | 90HB |
| TP347H | 75 [515] | 30 [205] | 35 | 192HBW/200Hv | 90HB |
Chemical Composition of TP347:
| TP347 | Maximum | Minimum |
| Ni | 13.00 | 9.00 |
| C | 00.08 | 00.04 |
| Mn | 2.00 | – |
| P | 00.045 | – |
| S | 00.030 | – |
| Si | 1.00 | – |
| Cr | 20.0 | 17.0 |
| Mo | 3 – 4 | – |
| N | – | – |
| OTHER | 1.0 | Nb=10(C+N) |
TP347 Equivalent Material
| STANDARD | WERKSTOFF NR. | UNS |
| SS 347 | 1.4550 | S34700 |
Mechanical Properties:
| Element | TP 347 |
| Melting Range | 1454 °C (2650 °F) |
| Tensile Stress | Psi – 75000 , MPa – 515 |
| Yield Stress (0.2%Offset) | Psi – 30000 , MPa – 205 |
| Elongation | 35 % |
| Hardness (Brinell) | 201 |
TP347 Tubing Physical Properties
| Grade | 347 |
| Density | 8000 kg/m3 |
| Elastic Modulus | 193 GPa |
| Specific Heat 0-1000C | 500 J/kg.K |
| Electrical Resistivity | 740 n.m |
Applications:
TP347 stainless steel pipe plays a key role in the petroleum, chemical and power industries. In the petroleum industry, it is used as oil wells and oil pipelines, resistant to high temperature and high pressure, and resists crude oil corrosion. In the chemical field, it is used to manufacture reactors and heat exchangers to resist corrosion from various chemicals. In the power field, it is used for boilers and steam pipes to ensure the safe operation of power production.
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