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ASTM A268 TP444 Stainless Steel Seamless U Bend Tube For Heat
Exchanger
Overview
ASTM A213: ASTM A213 is a standard specification for seamless ferritic and austenitic alloy-steel boiler, superheater, and heat-exchanger tubes. This specification outlines the requirements for various grades of tubes used in high-temperature and corrosive environments.
TP444: TP444 is a specific grade of stainless steel. It belongs to the ferritic stainless steel family and typically contains chromium, molybdenum, and nitrogen for improved corrosion resistance and high-temperature strength. TP444 is known for its resistance to chloride stress corrosion cracking and certain types of acidic environments.
U bend tube: A U bend tube refers to a tube that has been bent in the shape of a U. This design allows for efficient heat transfer in heat exchangers and condensers, particularly in applications where space is limited. The U-shaped bend permits fluid to flow through the tube while changing direction without the need for additional connectors or fittings.
The benefits of ASTM A213 U Bend Tube
1>.Space-efficient design: U bend tubes are specifically designed to save space in heat exchangers and condensers. The U-shaped bend allows for a compact installation without the need for additional connectors or fittings. This is particularly advantageous in applications where space is limited.
2>.Optimal heat transfer: The U bend shape of the tube promotes efficient heat transfer. It ensures that the fluid flows smoothly through the tube, facilitating maximum heat exchange between the fluid and the surrounding environment. This improves the overall performance and efficiency of the heat exchanger or condenser.
3>.Reduced pressure drop: U bend tubes are designed to minimize pressure drop within the system. The smooth and continuous flow path, with no abrupt changes in direction, helps maintain a consistent flow rate and reduces resistance to fluid flow. This results in lower energy consumption and improved system performance...
| Grade | C | Mn | Si | P | S | Cr | Mo | |
| TP444 | Min | 17.5 | 1.75 | |||||
| Max | 0.03 | 1.0 | 1.0 | 0.04 | 0.03 | 19.5 | 2.50 |
Mechanical Properies of ASME SA213 TP444
| Grade | Tensile Str Ksi(Mpa) | Yield Str Ksi(Mpa) | Elongation(%) | Hardness | |
| Rockwell | Brinell/Vickers | ||||
| TP444 | ≥60(415) | ≥40(275) | ≥20 | 96 HRB | 217 HBW/230 HV |
Wall Thickness Tolerance of ASME SA213
| Welded, Hot-Finished Tubes | Type | Wall Thickness Tolerance |
| OD Range | Average(-) | |
| 6~65mm(Incl.) | SMLS&WLD | (-12.5%,+20%) |
| >65mm | SMLS&WLD t/D≤5% | (-12.5%,+22.5%) |
| >65mm | SMLS&WLD t/D>5% | (-12.5%,+15%) |
