Stainless Steel Welded Pipe Introduction
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Product: |
Stainless steel welded pipe, stainless steel erw pipe, stainless steel efw pipe |
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Application: |
In Petroleum, Aerospace, Chemical, Power, Boilers, Military Industry |
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Size:
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OD: 2" - 48" |
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WT: 5S, 10S, STD, XH, 40, 80, 100, 120, 160, XXH |
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LENGTH: Single Random, Double Random, Cut Length max to 23m |
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Standard |
ASTM A240, ASTM A269, ASTM A312, ASTM A358, ASTM A778 |
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Grades |
201, 304/304L, 316/316L, 317/317L, 347/347H, 321/321H, 904L |
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Surface |
Annealed, Pickling, Polished |
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Packing |
Waterproof Paper Wrapped, Packed in Wooden Cabins |
Stainless Steel Pipe Specifications
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ASTM A312 |
Standard Specification for Seamless and Welded Austenitic Stainless Steel Pipes |
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ASTM A1016/A1016M |
Standard Specification for General Requirements for Ferritic Alloy Steel, Austenitic Alloy Steel, and Stainless Steel Tubes |
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A268 |
Standard Specification for Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service |
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A269 |
Standard Specification for Seamless and Welded Austenitic Stainless Steel Tubing for General Service |
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A250 |
Standard Specification for Electric-Resistance-Welded Ferritic Alloy-Steel Boiler and Superheater Tubes |
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A270 |
Standard Specification for Seamless and Welded Austenitic Stainless Steel Sanitary Tubing |
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A358 |
Standard Specification for Electric-Fusion-Welded Austenitic Chromium-Nickel Alloy Steel Pipe for High-Temperature Service |
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A409 |
Standard Specification for Welded Large Diameter Austenitic Steel Pipe for Corrosive or High-Temperature Service |
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A632 |
Specification for Seamless and Welded Austenitic Stainless Steel Tubing (Small-Diameter) for General Service |
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A688 |
Specification for Welded Austenitic Stainless Steel Feedwater Heater Tubes |
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A789 |
Specification for Seamless and Welded Ferritic/Austenitic Stainless Steel Tubing for General Service |
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A814 |
Specification for Cold-Worked Welded Austenitic Stainless Steel Pipe |
Applications & Uses of Stainless Steel Pipe
Stainless steel pipe (tube) has excellent characteristics of corrosion resistance and smooth finishing.
Stainless steel pipe (tube) is commonly used in demanding equipment like automobiles, food processing, water treatment facilities, oil and gas processing, refinery and petrochemicals, breweries and energy industries.
- Automotive industries
- Food processing
- Water treatment facilities
- Breweries and energy industries
SS Welded Pipe Test
Chemical Component Analysis, Mechanical Properties (Ultimate tensile strength, Yield strength, Elongation),
Technical Properties (Flattening Test, Bending Test, Blow Test, Impact Test), Exterior Size Inspection, Hydrostatic Test, X-ray Test.Third party inspection: SGS, BV, Lloyds etc.
ERW (Electric Resistance Welding): Uses high-frequency current to weld edges together. Cost-effective for standard sizes, excellent for diameters 1/2-12 inch. Production speed: 50-100m/min.
Laser Welding: Uses concentrated laser beam for precise welding. Benefits: Narrow heat-affected zone, minimal distortion, superior weld quality for thin walls. Ideal for precision applications and diameters 1/8-6 inch.
Selection depends on size range, wall thickness, and application requirements.
Welded advantages:
- Cost: 30-50% lower than seamless
- Size range: Larger diameters (up to 48 inch) available
- Consistency: Uniform wall thickness, smoother surface
- Delivery: Faster production, better inventory availability
Seamless advantages:
- No weld seam: Better for high-pressure applications
- Seamless interior: Preferred for hygienic applications
For most industrial applications (70% of cases), welded pipes provide excellent performance at lower cost.
Available finishes:
(1) 2B (Mill Finish) - Standard, versatile, easy to clean
(2) Bright Annealed (BA) - Mirror-like, no scale
(3) #4 (Brushed) - Linear satin finish, decorative
(4) #8 (Mirror) - Highest polish, architectural
(5) Pickled - Matte gray, removes embedded iron
(6) Passivated - Enhanced corrosion resistance
Surface selection depends on aesthetic requirements and cleaning frequency.
Quality tests included:
- Weld seam inspection: Eddy current testing (100%)
- Hydrostatic test: Per ASTM A312 requirements
- PMI (Positive Material Identification): Verify grade
- Intergranular corrosion test: ASTM A262
- Dimensional inspection: OD, wall, length
- Surface inspection: Weld spatter, scale, defects
Mill Test Certificates (MTC) per EN 10204 3.1 provided with each shipment.
Our quality assurance:
(1) Raw material verification: Certificate + PMI testing
(2) In-process monitoring: Welding parameters recorded
(3) 100% weld seam testing: Eddy current/ultrasonic
(4) Heat treatment: Solution annealing for stress relief
(5) Final inspection: Dimensional + visual
Weld reinforcement controlled to <3mm for smooth flow. Internal weld scar removed by expander.
Standard packaging:
(1) PE plugs on both ends - Prevents contamination
(2) Paper interleaving between pipes - Prevents surface damage
(3) Steel straps + wooden pallets - Secure handling
(4) Waterproof wrapping - Moisture protection
For polished/decorative: Individual paper wrap + wooden crates.
Loading: 20ft: 8-12 tons; 40ft: 18-22 tons. FOB Tianjin/Qingdao available.
Standard of Stainless Steel Welded Pipe
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Nominal Diameter NPS |
Outside Diameter (mm) |
Nominal Wall Thickness (mm) |
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ASME B36.19M |
ASME B36.10M |
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SCH 5S |
SCH 10S |
SCH 40S |
SCH 80S |
SCH 5 |
SCH 10 |
SCH 20 |
STD |
XS |
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1/4 |
13.72 |
- |
1.65 |
2.24 |
3.02 |
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1.65 |
- |
2.24 |
3.02 |
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3/8 |
17.15 |
- |
1.65 |
2.31 |
3.2 |
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1.65 |
- |
2.31 |
3.2 |
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1/2 |
21.34 |
1.65 |
2.11 |
2.77 |
3.73 |
1.65 |
2.11 |
- |
2.77 |
3.73 |
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3/4 |
26.67 |
1.65 |
2.11 |
2.87 |
3.91 |
1.65 |
2.11 |
- |
2.87 |
3.91 |
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1 |
33.4 |
1.65 |
2.77 |
3.38 |
4.55 |
1.65 |
2.77 |
- |
3.38 |
4.55 |
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1 1/4 |
42.16 |
1.65 |
2.77 |
3.56 |
4.85 |
1.65 |
2.77 |
- |
3.56 |
4.85 |
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1 1/2 |
48.26 |
1.65 |
2.77 |
3.68 |
5.08 |
1.65 |
2.77 |
- |
3.68 |
5.08 |
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2 |
60.33 |
1.65 |
2.77 |
3.91 |
5.54 |
1.65 |
2.77 |
- |
3.91 |
5.54 |
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2 1/2 |
73.03 |
2.11 |
3.05 |
5.16 |
7.01 |
2.11 |
3.05 |
- |
5.16 |
7.01 |
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3 |
88.9 |
2.11 |
3.05 |
5.49 |
7.62 |
2.11 |
3.05 |
- |
5.49 |
7.62 |
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3 1/2 |
101.6 |
2.11 |
3.05 |
5.74 |
8.08 |
2.11 |
3.05 |
- |
5.74 |
8.08 |
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4 |
114.3 |
2.11 |
3.05 |
6.02 |
8.56 |
2.11 |
3.05 |
- |
6.02 |
8.56 |
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5 |
141.3 |
2.77 |
3.4 |
6.55 |
9.53 |
2.77 |
3.4 |
- |
6.55 |
9.53 |
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6 |
168.28 |
2.77 |
3.4 |
7.11 |
10.97 |
2.77 |
3.4 |
- |
7.11 |
10.97 |
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8 |
219.08 |
2.77 |
3.76 |
8.18 |
12.7 |
2.77 |
3.76 |
6.35 |
8.18 |
12.7 |
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10 |
273.05 |
3.4 |
4.19 |
9.27 |
12.7 |
3.4 |
4.19 |
6.35 |
9.27 |
12.7 |
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12 |
323.85 |
3.96 |
4.57 |
9.53 |
12.7 |
3.96 |
4.57 |
6.35 |
9.53 |
12.7 |
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14 |
355.6 |
3.96 |
4.78 |
9.53 |
12.7 |
3.96 |
6.35 |
7.92 |
9.53 |
12.7 |
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16 |
406.4 |
4.19 |
4.78 |
9.53 |
12.7 |
4.19 |
6.35 |
7.92 |
9.53 |
12.7 |
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18 |
457.2 |
4.19 |
4.78 |
9.53 |
12.7 |
4.19 |
6.35 |
7.92 |
9.53 |
12.7 |
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20 |
508 |
4.78 |
5.54 |
9.53 |
12.7 |
4.78 |
6.35 |
9.53 |
9.53 |
12.7 |
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22 |
558.8 |
4.78 |
5.54 |
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4.78 |
6.35 |
9.53 |
9.53 |
12.7 |
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24 |
609.6 |
5.54 |
6.35 |
9.53 |
12.7 |
5.54 |
6.35 |
9.53 |
9.53 |
12.7 |
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26 |
660.4 |
- |
- |
- |
- |
- |
7.92 |
12.7 |
9.53 |
12.7 |
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28 |
711.2 |
- |
- |
- |
- |
- |
7.92 |
12.7 |
9.53 |
12.7 |
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30 |
762 |
6.35 |
7.92 |
- |
6.35 |
- |
7.92 |
12.7 |
9.53 |
12.7 |
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32 |
812.8 |
Thinkness: 8.63-30mm |
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Product Name |
Executive Standard |
Dimension |
Steel Code / Steel Grade |
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Industrial Pipes |
ASTM A312, A358, A778 |
OD: 1/4"~40" |
TP304, TP304L, TP316L, SUS304TP |
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Tubes for Boiler and Heat-Exchanger, General Service Tubing |
ASTM A249, A269, JIS G3463 |
OD: 15.9~139.8mm |
TP304, TP304L, TP316L, SUS304TB |
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Mechanical and Structural Tubes |
ASTM A554, JIS G3446 |
OD: 7.9~152.4mm |
MT304, MT304L, MT316L, MT430 Grade 201, 202 as per mill's STD SUS304 |
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Square Tubes |
ASTM A554 |
OD: 12.7x12.7~150x150mm |
MT304, MT304L, MT316L, MT430 Grade 201, 202 as per mill's STD |
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Rectangular Tubes |
ASTM A554 |
OD: 10x20~100x200mm |
MT304, MT304L, MT316L, MT430 Grade 201, 202 as per mill's STD |
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Sanitary Tubing |
ASTM A270 |
OD: 25.4~165.2mm |
TP304, TP304L, TP316L, SUS304TBS |
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Large Gauge Pipes for Ordinary Piping |
JIS G3448 |
OD: 15.88~318.5mm |
SUS304TPD |
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Large Diameter Pipes |
JIS G3468 |
OD: 14"~40" |
SUS304TPY |