Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tube ASTM A213 ASME SA213 TP347H
YUHONG GROUP we are one of the leading manufacturers of stainless steel tubes for heat exchanger .With the development more than 35 years' development we have exported more than 85 countries all around the world .Yuhong brand products ,with competive price and delivery ,won the great praise among our clients .
Stainnless steel seamless tube Specification:
ASME SA213/A213: Standard Specification for Seamless Ferritic and Austenitic Alloy-
Steel Boiler, Superheater and Stainless Steel Heat Exchanger Tubes.
Stainless Steel TP347 Seamlesstube is a high-performance, precision-engineered tube crafted from a single, solid billet of a niobium-stabilized austenitic stainless steel alloy. Unlike welded tubes, it has no weld joint, ensuring superior structural integrity and reliability, especially under high-stress and high-temperature conditions. The"347"designation refers to a specific grade stabilized with niobium (also known as columbium). This stabilization prevents the formation of chromium carbide precipitates in the heat-affected zone of welded areas, which would otherwise lead to intergranular corrosion. This makes it an ideal choice for applications where the component will be exposed to temperatures in the carbide precipitation range of 800-1500°F (425-816°C).
Material Grade:
|
Grade
|
C |
Cr |
Ni |
Mn |
P |
S |
Si |
Other |
| 347 |
≤0.08 |
17.00-19.00 |
9.00-13.00 |
≤2.00 |
≤0.035 |
≤0.030 |
≤1.00 |
Nb≥10*C% |
| 347H |
0.04-0.10 |
17.00-19.00 |
9.00-13.00 |
≤2.00 |
≤0.035 |
≤0.030 |
≤1.00 |
Nb≥8*C%
|
Size Range:
| Production |
Outside Diameter |
Wall Thickness |
| Heat Exchanger Tube |
6.00mm to 101.6mm |
0.5mm to 8mm |
Final Finishing
Solution Annealed & Pickled/Bright Annealed.
Type of Tubes:
U-bend & Straight.
Some of the quality tests carried out by us includes:
| Corrosion Test |
Conducted only when specially requested by the client |
| Chemical Analysis |
Test done as per required quality standards |
| Destructive / Mechanical Testing |
Tensile | Hardness | Flattening | Flare | Flange |
| Reverse-bend and Re. flat tests |
Carried out in full compliance with relevant standards & ASTM A-450 and A-530 norms, which ensures trouble-free expansion, welding & use at customers end |
| Eddy Current Testing |
Done to detect homogeneities in subsurface by using Digital Flaw-mark Testing System |
| Hydrostatic Testing |
100% Hydrostatic Testing carried out according to ASTM-A 450 norms for checking tube leakage, and biggest pressure we can support 20Mpa/7s . |
| Air Under Pressure Test |
To check any evidence of air leakage |
| Visual Inspection |
After passivation, every single length of tubes & pipes is subjected to thorough visual inspection by trained staff for detecting surface flaws & other imperfections |
Supplementary Testing : Apart from the above mentioned tests, we also carry out on the manufactured products supplementary testing. The tests conducted under this include:
- Eddy Current Testing
- O.P Testing
- Radiography Testing
|
- Corrosion Testing
- Micro Testing
- Macro Testing
|
- IGC Testing
- Ultrasonic testing
- Liquid Penetrate testing
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-
-
-
|
Manufacturing Process
The manufacturing of a Stainless Steel TP347 Seamless Tubes is a precise, multi-step process:
- Heating: A solid billet of Stainless Steel 347 is heated to a high temperature.
- Piercing: A piercing mill pushes a mandrel through the center of the heated billet to form a hollow shell.
- Drawing and Sizing: The hollow shell is then rolled and drawn to reduce its diameter and wall thickness to the desired dimensions.
- Heat Treatment: The tube is solution annealed to achieve its specified metallurgical properties and to ensure optimal performance.
- Finishing: The tube is cut to length, straightened, and subjected to rigorous testing to ensure it meets the highest standards for performance and reliability. This meticulous process ensures that every seamless Stainless Steel 347 tube is built to withstand the most extreme operating conditions
Applications
The combination of high-temperature stability and excellent corrosion resistance of TP347 Stainless Steel Tube makes them a preferred choice for:
Power Generation: Used in superheater and reheater tubes for boilers.
Aerospace: In jet engine components, exhaust manifold tubing, and high-temperature fasteners.
Chemical and Petrochemical Processing: For furnace parts, heat exchangers, and expansion joints where temperatures are in the carbide precipitation range.
Waste Incineration: For components in waste incinerators and combustion chambers.
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