Products Description
Product Specifications
| Standards | ASTM A249 / ASME SA249 |
| Steel Grades | TP201 TP202 TPXM-19 TPXM-29 TP304 TP304L TP304H TP304N TP304LN TP305 TP309S TP309H TP309Cb TP309HCb TP310 TP310S TP310H TP310Cb TP310HCb TP316 TP316L TP316H TP316N TP316LN TP317 TP317L TP321 TP321H TP347 TP347H TP348 TP348H TPXM-15 |
| Equivalent Standards | EN 10217-7, DIN 17457, JIS G3463 |
| Outer Diameter (OD) | 5mm-219.1mm |
| Wall Thickness (WT) | 0.4mm-8mm |
| Length | Customized |
| Surface Treatment | Bright annealed |
| Production Process | TIG welded (ERW/HFW optional), cold drawn |
| Condition | Annealed & bright annealed |
Following bright annealing treatment, the inner surface roughness (Ra) of the stainless steel pipe coil is ≤ 0.8 μm; this smooth inner wall effectively reduces fluid flow resistance.
Manufactured in strict compliance with ASTM A249 standards, the tubing undergoes a post-weld cold drawing process to restore the material's ductility and corrosion resistance, thereby effectively mitigating the risk of intergranular corrosion within the weld's heat-affected zone.
Compared to copper tubing, stainless steel offers a significantly broader operating temperature range-spanning from -200°C to 800°C-and boasts a service life twice that of copper.
Customized Services
- Coil shapes-such as U-shaped, serpentine, spiral, and coil-disc configurations-can be customized to meet specific client requirements.
- We offer custom sizing services supporting outer diameters ranging from 5 mm to 219.1 mm and wall thicknesses from 0.4 mm to 8 mm.
- We provide specialized packaging solutions-including wooden crating, anti-rust paper wrapping, and moisture-proof sealing-to ensure safe delivery during long-distance sea transport.
manufacturing process
Chemical Composition
| Grade | C | Mn | P | S | Si | Cr | Ni | Mo | Others |
|---|---|---|---|---|---|---|---|---|---|
| TP304 | ≤0.08 | ≤2.00 | ≤0.045 | ≤0.030 | ≤1.00 | 18.0–20.0 | 8.0–10.5 | - | - |
| TP316L | ≤0.03 | ≤2.00 | ≤0.045 | ≤0.030 | ≤1.00 | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 | - |
| TP321 | ≤0.08 | ≤2.00 | ≤0.045 | ≤0.030 | ≤1.00 | 17.0–19.0 | 9.0–12.0 | - | Ti ≥ 5×C |
| TP347H | 0.04–0.10 | ≤2.00 | ≤0.045 | ≤0.030 | ≤1.00 | 17.0–20.0 | 9.0–13.0 | - | Nb (Nb+Ta) ≥10×C |
Mechanical Properties
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HRB) |
|---|---|---|---|---|
| TP304 | ≥515 | ≥205 | ≥35 | ≤90 |
| TP316L | ≥485 | ≥170 | ≥35 | ≤95 |
| TP321 | ≥515 | ≥205 | ≥35 | ≤95 |
| TP347H | ≥515 | ≥205 | ≥35 | ≤95 |
Possible Alternative Grades
- For simple HVAC scenarios characterized by non-corrosive conditions, low temperatures, and low pressures-such as temporary HVAC equipment or coils paired with standard ventilation ducts-the TP201 grade is a suitable and cost-effective choice.
- For high-temperature HVAC applications where the operating temperature does not exceed 600°C, TP304H may be selected as an alternative to TP321.
application areas
- HVAC air conditioning systems
- Chillers and cooling towers
- Evaporators and condensers
- Refrigeration heat exchangers
- District cooling systems
- Industrial ventilation cooling loops
Products Show
Testing Equipment
Factory Equipment
Pickling equipment
Products Package
FAQ
Q: Have the coils undergone pressure testing?
A: All ASTM A249 coils undergo 100% in-line eddy current testing or hydrostatic testing to ensure the tubing is free of leak defects.
Q: Can coils be customized to any size?
A: Yes, coils can be customized to any size; the minimum outer diameter available is 5 mm, while the maximum coil length can be designed according to the specific dimensions required.
Q: What is the minimum bending radius for the coils?
A: Under standard conditions, the minimum bending radius is two times the outer diameter of the tube. Tighter bending radii can be customized to meet specific requirements.
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