Premium Stainless Welded Pipe & Tube
Our Stainless Welded Pipes provide an excellent balance of corrosion resistance, structural integrity, and cost-effectiveness. Manufactured through advanced welding processes (ERW, EFW, LSAW, SSAW), these pipes are indispensable in high-demand industries like petroleum, chemical processing, paper making, and seawater applications.
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Size Range: Outer Diameter (O.D.): 6mm – 3000mm | Wall Thickness (W.T.): 0.5mm – 65mm.
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Welding Methods: ERW, EFW, LSAW, SSAW.
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Standards: ASTM A312, A249, A269, A358, A778, A790, A928; EN 10217-7; DIN 17457, 17455; JIS G3459, G3468, G3448.
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Materials Available: Austenitic (TP304/L/H, TP316/L/Ti, TP321, TP347, TP310S), Ferritic & Martensitic, Duplex (S31803, S32205, S32750), and Special Alloys (Alloy 20, 254SMO, 904L).
Description
1. Product Overview & Applications
A Stainless Welded Pipe is formed by rolling a flat steel plate and welding the seam. Welded stainless steel pipes are generally more cost-effective than seamless pipes. Due to their excellent corrosion resistance and structural versatility, they are widely adopted across various industries.
Primary Applications: Petroleum, chemical industry, chemical fiber, smelting, medical machinery, paper making, heat preservation and refrigeration, mechanical equipment, food processing, electricity, water conservancy, architecture, aerospace, navigation, seabed exploration, environmental protection, boiler heat exchangers, and seawater applications.
2. General Specifications & Material Grades
- Outside Diameter (O.D.): 6mm – 3000mm
- Wall Thickness (W.T.): 0.5mm – 65mm
- Length: Standard lengths or customized per client requirements.
- Welding Methods: ERW (Electric Resistance Welding), EFW (Electric Fusion Welding), LSAW (Longitudinal Submerged Arc Welding), SSAW (Spiral Submerged Arc Welding).
- Executive Standards: ASTM A312, A249, A269, A358, A778, A790, A928; EN 10217-7; DIN 17457, DIN 17455; JIS G3459, JIS G3468, JIS G3448; GOST 9940, GOST 9941.
Material Grades
- Austenitic: TP304, TP304L, TP304H, TP304LN, TP316/TP316L, TP316H, TP316Ti, TP316LN, TP321, TP321H, TP317, TP317L, TP347, TP347H, TP348, TP348H, TP309S, TP310S, TP310H.
- Ferritic & Martensitic: TP405, TP410, TP420, TP430, TP440A, TP440B, TP440C.
- Duplex: S31803, S32205, S32750, S32760.
- Others: Alloy 20, 253MA, 254SMO, AL-6XN, 904L.
3. Dimension Chart (ANSI B36.19 & ANSI B36.10)
| NPS | O.D. (mm) | Nominal Wall Thickness (mm) | |||||
|---|---|---|---|---|---|---|---|
| 5S | 10S | 40S | 80S | 160 | XXS | ||
| 1/8 | 10.29 | 0.89 | 1.24 | 1.73 | 2.41 | – | – |
| 1/4 | 13.72 | 1.24 | 1.65 | 2.24 | 3.02 | – | – |
| 3/8 | 17.15 | 1.24 | 1.65 | 2.31 | 3.20 | – | – |
| 1/2 | 21.34 | 1.65 | 2.11 | 2.77 | 3.73 | 4.78 | 7.47 |
| 3/4 | 26.67 | 1.65 | 2.11 | 2.87 | 3.91 | 5.56 | 7.82 |
| 1 | 33.40 | 1.65 | 2.77 | 3.38 | 4.55 | 6.35 | 9.09 |
| 1 1/4 | 42.16 | 1.65 | 2.77 | 3.56 | 4.85 | 6.35 | 9.70 |
| 1 1/2 | 48.26 | 1.65 | 2.77 | 3.68 | 5.08 | 7.14 | 10.15 |
| 2 | 60.33 | 1.65 | 2.77 | 3.91 | 5.54 | 8.74 | 11.07 |
| 2 1/2 | 73.03 | 2.11 | 3.05 | 5.16 | 7.01 | 9.53 | 14.02 |
| 3 | 88.90 | 2.11 | 3.05 | 5.49 | 7.62 | 11.13 | 15.24 |
| 3 1/2 | 101.60 | 2.11 | 3.05 | 5.74 | 8.08 | – | – |
| 4 | 114.30 | 2.11 | 3.05 | 6.02 | 8.56 | 13.49 | 17.12 |
| 5 | 141.30 | 2.77 | 3.40 | 6.55 | 9.53 | 15.88 | 19.05 |
| 6 | 168.28 | 2.77 | 3.40 | 7.11 | 10.97 | 18.26 | 21.95 |
| 8 | 219.08 | 2.77 | 3.76 | 8.18 | 12.70 | 23.01 | 22.23 |
| 10 | 273.05 | 3.40 | 4.19 | 9.27 | 12.70 | 28.58 | 25.40 |
| 12 | 323.85 | 3.96 | 4.57 | 9.53 | 12.70 | 33.32 | 25.40 |
| 14 | 355.60 | 3.96 | 4.78 | 9.53 | 12.70 | 35.71 | – |
| 16 | 406.40 | 4.19 | 4.78 | 9.53 | 12.70 | 40.49 | – |
| 18 | 457.20 | 4.19 | 4.78 | 9.53 | 12.70 | 45.24 | – |
| 20 | 508.00 | 4.78 | 5.54 | 9.53 | 12.70 | 50.01 | – |
| 24 | 609.60 | 5.54 | 6.35 | 9.53 | 12.70 | 59.54 | – |
4. Chemical Composition & Mechanical Properties
Austenitic Stainless Steels
| Grade | Chemical Composition (%) Max unless range is given | Mechanical Properties (Min) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| C | Mn | P | S | Si | Cr | Ni | Mo / Others | Rm MPa | Rp0.2 MPa | A % | |
| TP304 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 18.0~20.0 | 8.0~11.0 | – | 515 | 205 | 35 |
| TP304L | 0.035 | 2.00 | 0.045 | 0.030 | 1.00 | 18.0~20.0 | 8.0~13.0 | – | 485 | 170 | 35 |
| TP304H | 0.04~0.10 | 2.00 | 0.045 | 0.030 | 1.00 | 18.0~20.0 | 8.0~11.0 | – | 515 | 205 | 35 |
| TP316 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 16.0~18.0 | 11.0~14.0 | Mo: 2.0~3.0 | 515 | 205 | 35 |
| TP316L | 0.035 | 2.00 | 0.045 | 0.030 | 1.00 | 16.0~18.0 | 10.0~14.0 | Mo: 2.0~3.0 | 485 | 170 | 35 |
| TP316Ti | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 16.0~18.0 | 10.0~14.0 | Mo: 2.0~3.0 Ti: 5x(C+N)~0.7 |
515 | 205 | 35 |
| TP321 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 17.0~19.0 | 9.0~12.0 | Ti: 5xC~0.7 | 515 | 205 | 35 |
| TP347 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 17.0~19.0 | 9.0~13.0 | Cb+Ta: 10xC~1.1 | 515 | 205 | 35 |
| TP310S | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 24.0~26.0 | 19.0~22.0 | – | 515 | 205 | 35 |
Ferritic/Martensitic & Duplex Stainless Steels
| Grade | Chemical Composition (%) Max unless range is given | Mechanical Properties (Min) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| C | Mn | P | S | Si | Cr | Ni | Mo / N | Rm MPa | Rp0.2 MPa | A % | |
| Ferritic & Martensitic | |||||||||||
| TP405 | 0.08 | 1.00 | 0.040 | 0.030 | 1.00 | 11.5~14.5 | 0.50 | Al: 0.1~0.3 | 415 | 205 | 20 |
| TP410 | 0.15 | 1.00 | 0.040 | 0.030 | 1.00 | 11.5~13.5 | 0.50 | – | 415 | 205 | 20 |
| TP420 | ≥ 0.15 | 1.00 | 0.040 | 0.030 | 1.00 | 12.0~14.0 | 0.50 | – | 450 | 225 | 20 |
| TP430 | 0.12 | 1.00 | 0.040 | 0.030 | 1.00 | 16.0~18.0 | 0.50 | – | 450 | 240 | 22 |
| Duplex | |||||||||||
| S31803 | 0.03 | 2.00 | 0.030 | 0.020 | 1.00 | 21.0~23.0 | 4.5~6.5 | Mo: 2.5~3.5 N: 0.08~0.20 |
620 | 450 | 25 |
| S32205 | 0.03 | 2.00 | 0.030 | 0.020 | 1.00 | 22.0~23.0 | 4.5~6.5 | Mo: 3.0~3.5 N: 0.14~0.20 |
655 | 450 | 25 |
| S32750 | 0.03 | 1.20 | 0.035 | 0.020 | 0.80 | 24.0~26.0 | 6.0~8.0 | Mo: 3.0~5.0 N: 0.24~0.32 Cu: 0.50 |
795 | 550 | 15 |
5. Manufacturing Process
Our stainless welded pipes are manufactured using various advanced techniques depending on the diameter and application requirements. Common welding methods include Electric Resistance Welding (ERW), Electric Fusion Welding (EFW), and Submerged Arc Welding (LSAW/SSAW).
Raw Material Coil/Plate → Uncoiling/Leveling → Edge Milling → Forming → Welding → Sizing → Annealing → Straightening → Cutting → End Facing → Hydrostatic Testing → Pickling & Passivation → Non-Destructive Testing (X-ray/UT) → Final Inspection → Marking → Packaging & Delivery.
6. Packing & Delivery
We ensure that our stainless welded pipes are packed securely to prevent any damage during transportation, particularly for sea freight. Packing methods include:
- Plastic caps on both ends of the pipes to protect the edges.
- Wrapped in waterproof plastic bags or film.
- Small diameter pipes are bundled with steel strips.
- Large diameter pipes are placed in custom-built seaworthy wooden crates or boxes.
