Products Description
Product Specifications
| Standards |
JIS G3463 |
| Steel Grades | SUS304TB SUS304HTB SUS304LTB SUS309TB SUS309STB SUS310TB SUS310STB SUS312LTB SUS316TB SUS316HTB SUS316LTB SUS316TiTB SUS317TB SUS317LTB SUS321TB SUS321HTB SUS347TB SUS347HTB SUS836LTB SUS890LTB SUSXM1SJ1TB |
| Equivalent Standards |
ASTM A213, ASTM A249, EN 10216-5 |
| Outer Diameter (OD) | 15.9–76.2 mm |
| Wall Thickness (WT) | 0.8–6.0 mm |
| Length | Up to 20m |
| Surface Treatment | Pickled, bright annealed, polished |
| Production Process | Cold drawing / Cold rolling |
| Condition |
Solution Annealed (A), Bright Annealed (BA) |
U bend steel tubing is produced by CNC cold bending, with outer-arc wall thinning controlled to ≤12%, no significant wrinkling on the inner arc, and ovality controlled to ≤8%. This helps ensure accurate tube geometry and smooth insertion through tube-sheet holes and baffle plates during heat exchanger bundle assembly.
TORICH supplies JIS G3463 U-bend tubes in grades including SUS304TB, SUS304LTB, SUS316TB, SUS316LTB, SUS321TB, and SUS310TB, allowing material selection according to operating temperature, corrosion conditions, and process media in oil and gas heat exchanger applications.
Customized Services
- Customizable U-bend Radii and Dimensions: U-bend radii (R) can be customized from 1.5D to 6D based on the client's heat exchanger drawings. The lengths of the two straight legs can be asymmetrical (inverted U / tapered U).
- End Processing: Options include machined end bevels (30°/37.5°), pre-thinning of tube ends for expansion, external/internal threading, flaring, swaging (reducing), and spherical or flat-end finishing.
- Post-bending Heat Treatment: For cold-bent U-tubes, apply post-bending solution treatment or stress-relief annealing, depending on the material grade, bending radius, and wall thickness.
Chemical Composition
| Grade |
C |
Si |
Mn |
P |
S |
Cr |
Ni |
Mo |
|---|---|---|---|---|---|---|---|---|
|
SUS304TB |
≤0.08 |
≤1.00 |
≤2.00 |
≤0.040 |
≤0.030 |
18.0–20.0 |
8.0–11.0 |
– |
|
SUS304LTB |
≤0.030 |
≤1.00 |
≤2.00 |
≤0.040 |
≤0.030 |
18.0–20.0 |
9.0–13.0 |
– |
|
SUS316TB |
≤0.08 |
≤1.00 |
≤2.00 |
≤0.040 |
≤0.030 |
16.0–18.0 |
10.0–14.0 |
2.0–3.0 |
|
SUS316LTB |
≤0.030 |
≤1.00 |
≤2.00 |
≤0.040 |
≤0.030 |
16.0–18.0 |
12.0–16.0 |
2.0–3.0 |
|
SUS321TB |
≤0.08 |
≤1.00 |
≤2.00 |
≤0.040 |
≤0.030 |
17.0–19.0 |
9.0–13.0 |
– |
Mechanical Properties
| Property |
Tensile Strength (MPa) |
Yield Strength (MPa) |
Elongation (%) |
|---|---|---|---|
|
SUS304TB |
≥520 |
≥205 |
≥35 |
|
SUS304LTB |
≥480 |
≥175 |
≥35 |
|
SUS316TB |
≥520 |
≥205 |
≥35 |
|
SUS316LTB |
≥480 |
≥175 |
≥35 |
|
SUS321TB |
≥520 |
≥205 |
≥35 |
Possible Alternative Grades
- For oil and gas heat exchangers operating under conditions of high chloride content, high stress, or where thinner wall thicknesses are desired, duplex stainless steel 2205 is a suitable choice; however, its procurement cost is typically 1.5 to 2 times that of 316L.
- For applications involving operating temperatures exceeding 800°C-up to as high as 1000°C-SUS310S is an appropriate option, commonly used for furnace tubes and high-temperature flue gas heat exchangers.
- In extreme operating environments-such as deep-sea applications or conditions with high H₂S partial pressure and high chloride (Cl⁻) concentrations-select Inconel 625 or 825.
application areas
- Oil and Gas Processing Plants: Shell-and-tube heat exchanger tube bundles
- Refineries: Process fluid coolers and condensers in atmospheric and vacuum distillation units, fluid catalytic cracking (FCC) units, and hydroprocessing units
- Natural Gas Processing: Heat exchange units for dehydration, desulfurization, and dew-point control
- Petrochemical Plants: Catalyst-containing tubes, waste-heat recovery heat exchanger tubes, and high-temperature process piping
- Oilfield Water: Chlorine-resistant heat exchanger tube bundles for cooling and reinjection systems
Products Show
Testing Equipment
Factory Equipment
Pickling equipment
Polishing equipment
Cold drawing equipment
Products Package
FAQ
Q: What is the typical range for the bending radius of U-tubes?
A: The standard range is 1.5D–6D; non-standard custom specifications are also available. The selection of the bending radius must account for the tube layout space within the heat exchanger, limitations on wall thinning at the outer bend, and requirements for ovality after bending.
Q: Are end-processing services-such as pipe-end beveling or pre-thinning for tube-to-tubesheet expansion-available?
A: Yes. We offer various end-processing options, including plain ends, 30°/37.5° bevels, pre-thinning for expansion (reducing the outer diameter to fit tubesheet holes), external/internal threading, and flaring. All tubes are shipped with plastic protective caps on the ends.
Q: Can SUS304TB be used as a substitute for SUS316TB in oil and gas U-tube applications?
A: This may be considered only if the chloride content of the medium is low, the risk of crevice corrosion is effectively managed, and the design authority provides approval. The 2%–3% molybdenum (Mo) content in 316 provides the metallurgical basis for its superior pitting resistance; 304 contains no molybdenum, resulting in a significantly lower corrosion margin when exposed to chloride-containing oil, gas, or water.
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