Seamless Stainless Steel Pipe and Seamless Stainless Steel Tube are high-precision, high-strength stainless steel products manufactured without weld seams, widely used in pressure piping, boilers, heat exchangers, chemical processing, oil & gas, and marine engineering. As a leading supplier of ASTM A312 / A213 / A269 seamless stainless steel tubes, we provide 304/304L, 316/316L, 321, 310S, 317L, 2205, and super duplex grades, available in cold-drawn and hot-rolled conditions with export-ready packaging. Our seamless pipes ensure excellent corrosion resistance, high-temperature stability, and superior dimensional accuracy, meeting global B2B sourcing requirements.
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Products Description
Product Name: Seamless Stainless Steel Pipe / Tube
Also Known As: SS Seamless Pipe, SS Seamless Tube, Stainless Steel Hollow Pipe
Standards: ASTM A312, ASTM A213, ASTM A269, EN 10216-5, JIS G3459
Grades Available: 304 / 304L / 316 / 316L / 321 / 310S / 317L / 2205 / 2507
Manufacturing Method: Cold Drawn / Cold Rolled / Hot Rolled
OD Range: 6–508 mm (1/4"–20")
Wall Thickness: 0.5–50 mm (Sch 5S / 10S / 40S / 80S / XXS)
Length: 6 m / 20 ft or customized
Applications: Pressure piping, boiler tubes, chemical equipment, marine systems
Products Overview
Seamless stainless steel pipe/tube is produced by piercing solid billets and forming them into hollow cylinders without any weld joints. This manufacturing method provides superior pressure resistance, uniform structure, and reliable performance under demanding industrial conditions. Seamless pipes are preferred in high-pressure, high-temperature, and highly corrosive environments, offering long service life, consistent mechanical properties, and exceptional reliability.
Seamless Stainless Steel Pipe / Tube (Metric + Imperial Integrated)
1) Nominal Pipe Size 1/8" – 1"
Small Diameter – Instrumentation / Hydraulic / Heat Exchanger Tubing
| NPS | OD (mm) | OD (inch) | Schedule | Wall (mm) | Wall (inch) | Weight (kg/m) | Weight (lb/ft) |
|---|---|---|---|---|---|---|---|
| 1/8" | 10.3 | 0.405" | Sch 10/40 | 1.24 / 2.41 | 0.049 / 0.095 | 0.23 / 0.40 | 0.154 / 0.268 |
| 1/4" | 13.7 | 0.540" | Sch 10/40 | 1.65 / 2.77 | 0.065 / 0.109 | 0.38 / 0.58 | 0.254 / 0.389 |
| 3/8" | 17.1 | 0.675" | Sch 10/40 | 1.65 / 2.77 | 0.065 / 0.109 | 0.49 / 0.87 | 0.329 / 0.584 |
| 1/2" | 21.3 | 0.840" | Sch 5/10/40 | 1.65 / 2.77 / 3.73 | 0.065 / 0.109 / 0.147 | 0.63 / 0.97 / 1.27 | 0.423 / 0.653 / 0.855 |
| 3/4" | 26.7 | 1.050" | Sch 5/10/40 | 1.65 / 2.87 / 3.91 | 0.065 / 0.113 / 0.154 | 0.80 / 1.27 / 1.70 | 0.537 / 0.855 / 1.143 |
| 1" | 33.4 | 1.315" | Sch 5/10/40 | 2.77 / 3.38 / 4.55 | 0.109 / 0.133 / 0.179 | 2.00 / 2.36 / 3.09 | 1.34 / 1.58 / 2.08 |
2) Nominal Pipe Size 1-1/4" – 4"
Medium Diameter – Industrial / Chemical / Structural Piping
| NPS | OD (mm) | OD (inch) | Schedule | Wall (mm) | Wall (inch) | Weight (kg/m) | Weight (lb/ft) |
|---|---|---|---|---|---|---|---|
| 1-1/4" | 42.2 | 1.660" | Sch 10/40 | 2.77 / 4.85 | 0.109 / 0.191 | 2.58 / 4.34 | 1.73 / 2.92 |
| 1-1/2" | 48.3 | 1.900" | Sch 10/40 | 2.77 / 5.08 | 0.109 / 0.200 | 3.06 / 5.46 | 2.06 / 3.66 |
| 2" | 60.3 | 2.375" | Sch 5/10/40/80 | 2.11 / 2.77 / 3.91 / 5.54 | 0.083 / 0.109 / 0.154 / 0.218 | 3.52 / 4.55 / 6.33 / 8.66 | 2.37 / 3.05 / 4.25 / 5.81 |
| 2-1/2" | 73.0 | 2.875" | Sch 10/40 | 3.05 / 5.16 | 0.120 / 0.203 | 5.16 / 8.40 | 3.46 / 5.64 |
| 3" | 88.9 | 3.500" | Sch 10/40/80 | 3.05 / 5.49 / 7.62 | 0.120 / 0.216 / 0.300 | 6.68 / 11.7 / 15.9 | 4.49 / 7.86 / 10.67 |
| 4" | 114.3 | 4.500" | Sch 5/10/40/80 | 3.05 / 6.02 / 8.56 | 0.120 / 0.237 / 0.337 | 9.58 / 18.9 / 26.9 | 6.43 / 12.7 / 18.06 |
3) Nominal Pipe Size 5" – 12"
Large Diameter – Refinery / Boiler / Marine / Heat Exchanger
| NPS | OD (mm) | OD (inch) | Schedule | Wall (mm) | Weight (kg/m) | Weight (lb/ft) |
|---|---|---|---|---|---|---|
| 5" | 141.3 | 5.563" | Sch 10/40 | 3.40 / 6.55 | 12.3 / 23.2 | 8.26 / 15.58 |
| 6" | 168.3 | 6.625" | Sch 10/40/80 | 3.40 / 7.11 / 10.97 | 14.8 / 29.7 / 44.8 | 9.95 / 19.92 / 30.10 |
| 8" | 219.1 | 8.625" | Sch 10/40/80 | 3.76 / 8.18 / 12.70 | 20.0 / 44.5 / 67.8 | 13.43 / 29.88 / 45.54 |
| 10" | 273.1 | 10.750" | Sch 10/40/80 | 4.19 / 9.27 / 15.09 | 27.6 / 67.2 / 103.5 | 18.52 / 45.20 / 69.60 |
| 12" | 323.9 | 12.750" | Sch 10/40/80 | 4.57 / 9.53 / 17.48 | 34.3 / 79.1 / 143.7 | 23.04 / 53.10 / 96.55 |
4) Nominal Pipe Size 14" – 24"
Extra-Large Seamless Heavy-Wall (Special Mill Production)
| NPS | OD (mm) | OD (inch) | Schedule | Wall (mm) | Weight (kg/m) | Weight (lb/ft) |
|---|---|---|---|---|---|---|
| 14" | 355.6 | 14.000" | Sch 40/80 | 9.53 / 12.70 | 87.5 / 115.1 | 58.7 / 77.3 |
| 16" | 406.4 | 16.000" | Sch 40/80 | 9.53 / 12.70 | 100 / 130.2 | 67.2 / 87.4 |
| 18" | 457.0 | 18.000" | Sch 40/80 | 9.53 / 12.70 | 112 / 148 | 75.2 / 99.5 |
| 20" | 508.0 | 20.000" | Sch 40/80 | 12.7 / 15.09 | 168 / 198 | 113 / 133 |
| 24" | 610.0 | 24.000" | Sch 40/80 | 12.7 / 17.48 | 202 / 268 | 136 / 180 |
5) Weight Calculation Formulas (Professional Engineering Use)
Metric (kg/m)
W=0.02466×(OD−WT)×WTW = 0.02466 \times (OD - WT) \times WTW=0.02466×(OD−WT)×WT
Imperial (lb/ft)
W=10.69×(ODinch−WTinch)×WTinchW = 10.69 \times (OD_{inch} - WT_{inch}) \times WT_{inch}W=10.69×(ODinch−WTinch)×WTinch
Duplex & Super Duplex Seamless Pipe – Standard Size Table
| OD (mm) | OD (inch) | WT (mm) | WT (inch) | Schedule | DN | Pressure Class (Typical) | Remarks |
|---|---|---|---|---|---|---|---|
| 6.0 | 1/4" | 1.0 – 2.0 | 0.039–0.079 | 5S / 10S | DN6 | 150 – 300 | Instrument Tube |
| 10.0 | 3/8" | 1.0 – 2.5 | 0.039–0.098 | 5S / 10S | DN8 | 150 – 300 | Hydraulic / Control Lines |
| 12.7 | 1/2" | 1.2 – 3.0 | 0.047–0.118 | 10S / 40S | DN15 | 300 – 600 | High Corrosion Service |
| 19.05 | 3/4" | 1.2 – 3.5 | 0.047–0.138 | 10S / 40S | DN20 | 300 – 600 | Chemical & Offshore |
| 25.4 | 1" | 1.5 – 4.0 | 0.059–0.157 | 10S / 40S | DN25 | 300 – 900 | High Pressure Duplex |
| 31.8 | 1-1/4" | 2.0 – 4.5 | 0.079–0.177 | 10S / 40S | DN32 | 300 – 900 | Super Duplex Use |
| 38.1 | 1-1/2" | 2.0 – 5.0 | 0.079–0.197 | 10S / 40S | DN40 | 300 – 900 | High Chloride Resistance |
| 50.8 | 2" | 2.0 – 6.0 | 0.079–0.236 | 10S / 40S | DN50 | 600 – 1500 | Offshore Platform Piping |
| 60.3 | 2-1/2" | 2.0 – 6.4 | 0.079–0.252 | 10S / 40S | DN65 | 600 – 1500 | Seawater Systems |
| 73.0 | 3" | 2.5 – 7.0 | 0.098–0.276 | 10S / 40S | DN80 | 600 – 1500 | High Strength FPSO |
| 88.9 | 3-1/2" | 2.5 – 7.9 | 0.098–0.311 | 10S / 40S | DN90 | 600 – 1500 | Duplex Pressure Piping |
| 101.6 | 4" | 3.0 – 8.0 | 0.118–0.315 | 10S / 40S | DN100 | 900 – 2500 | Super Duplex in Oil & Gas |
| 114.3 | 4-1/2" | 3.0 – 8.8 | 0.118–0.346 | 40S / 80S | DN110 | 900 – 2500 | High Temp / High Pressure |
| 141.3 | 5" | 3.5 – 9.5 | 0.138–0.374 | 40S / 80S | DN125 | 900 – 2500 | Desalination Lines |
| 168.3 | 6" | 4.0 – 12.7 | 0.157–0.500 | 40S / 80S | DN150 | 1500 – 2500+ | Ultra Corrosion Systems |
| 219.1 | 8" | 4.0 – 15.0 | 0.157–0.591 | 40S / 80S | DN200 | 1500 – 2500+ | High Strength Marine |
| 273.0 | 10" | 4.0 – 20.0 | 0.157–0.787 | 40S / 80S | DN250 | 1500 – 2500+ | Subsea Pipelines |
| 323.9 | 12" | 4.0 – 25.0 | 0.157–0.984 | 40S / 80S | DN300 | 1500 – 2500+ | Pressure Vessel Piping |
Duplex & Super Duplex Material Coverage
| Category | Material Grades | UNS Code | PREN (Corrosion Index) | Application Level |
|---|---|---|---|---|
| Duplex | 2205, 2304 | S32205, S32304 | 32–35 | Standard High Corrosion |
| Super Duplex | 2507, ZERON 100, 32760 | S32750, S32760 | 40–45 | Extreme Chloride / Offshore |
| Hyper Duplex (可选) | 3207, 3407 | S33207 | >50 | Ultra Extreme Corrosion |
Manufacturing Range (Seamless)
| Item | Specification |
|---|---|
| Production OD | 6 mm – 610 mm |
| Wall Thickness | 1 mm – 50 mm |
| Manufacturing Methods | Hot Piercing, Hot Rolling, Cold Drawing, Pilger Mill |
| Length | 5.8 m / 6 m / 12 m / Custom |
| End Type | Plain End (PE), Beveled End (BE), Threaded (NPT/BSPT) |
| Testing | Hydrostatic, Eddy Current, PMI, UT, RT, DP |
Special Offshore / Marine Sizes (Super Duplex Priority)
| OD (inch) | WT (inch) | Typical Grade | Industry |
|---|---|---|---|
| 3/4" – 2" | 0.083–0.188 | 2507 / 32760 | Subsea Umbilicals |
| 2" – 4" | 0.120–0.250 | 2507 | FPSO Modules |
| 6" – 10" | 0.156–0.375 | 2507 / ZERON100 | Desalination High-Pressure |
| 10"–16" | 0.250–0.500 | 2507 | Offshore Main Headers |
Product Features & Advantages
No Weld Seam: Ideal for high-pressure and critical-system applications
Superior Corrosion Resistance: Excellent performance in chemical, marine, and food industries
High Temperature Strength: Suitable for boilers, heat exchangers, and steam systems
Excellent Dimensional Accuracy: Tight tolerances due to cold drawing/cold rolling
High Structural Integrity: Uniform hardness and consistent microstructure
Wide Grade Options: Austenitic, duplex, and super duplex grades available
Products Applications
High-pressure fluid and gas pipelines
Heat exchanger tubes
Boiler and condenser tubes
Petrochemical and refinery piping
Marine equipment and shipbuilding
Food and pharmaceutical processing
Hydraulic and instrumentation tubing
Inspection & Quality Assurance
Our seamless stainless steel tubes undergo strict quality controls:
Eddy current testing / Ultrasonic testing (UT)
Hydrostatic pressure testing
Dimensional accuracy inspection
Surface defect checks (Cracks, pits, inclusions)
Mechanical test reports (Tensile, hardness, elongation)
Chemical composition verification (Spectrometer)
Third-party inspection: SGS / BV / TÜV available
Full Mill Test Certificate EN 10204 3.1 / 3.2 provided
Looking for a reliable supplier of seamless stainless steel pipes and tubes? Our team provides technical support, customized sizing, professional documentation, and fast international delivery.
Our address
Room 4107, Runfeng Building, Sanqiao New Street, Weiyang District, Xi'an City, Shaanxi Province
Phone Number
+86 15769214734
FAQ
1. What is the main difference between seamless and welded stainless steel pipes?
Seamless pipes have no weld seam, offering higher pressure resistance and uniform performance, ideal for critical systems and high-temperature service.
2. Which manufacturing method is used-cold drawn or hot rolled?
Both are available:
Cold drawn: Better precision and surface finish
Hot rolled: Suitable for large diameters and heavy-wall sections
3. What is the maximum pressure rating for seamless stainless steel pipe?
Pressure rating depends on grade, OD, and wall thickness, but seamless pipes always exceed welded pipes at the same dimensions. Detailed pressure charts are available upon request.
4. Are these pipes suitable for corrosive chemical environments?
Yes. 316L / 317L / 2205 / 2507 are ideal for chloride-rich or highly corrosive media.
5. Can you provide cut-to-length or custom fabrication?
Yes. Services include:
Cutting
Bending
Polishing
Threading
End finishing (BE / PE / TBE)
6. Do you provide export-standard packaging?
Yes. All shipments are seaworthy:
Plastic caps, waterproof wrapping
Wooden cases or pallets
Steel strip reinforcement
7. What certifications are included?
EN 10204 3.1
Chemical + mechanical test reports
Optional third-party inspection (SGS/BV/TÜV)
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