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wyy@insulatedpipeline.com
Update time: 2025-06-06 Views: 7
I. Seamless Steel Pipe Sizes Chart
Specifications | Specifications | Specifications |
12×1.5 | 73×4-4.5-5-6-7-8-9-10-12-15 | 219×30-40 |
14×1.5-2.5-3 | 76×4-4.5-5-6-7-8-9-10-12-14 | 245×8-10-14-17-20-22 |
16×1.5-2.5-4 | 83×4.5-5-10/ 12 14 16 18 20 | 245×25-28-30-34-40 |
18×2.3-4-5 | 89×4.5-8-10/12-14 16 -18 20 | 273×7-9-12-15-18-20-25 |
20×2.5-3-5 | 95×4.5-6-8/10-12-14-16-20 | 273×30-35-38-40 |
24×2.5-3-4-5-6 | 102×4.5-5-6-7-8-10-12-14-16-20 | 299×8-12-16-20-24-28 |
25×2.5-3-4-5-6 | 108×4.5-5-6-7-8-10/12-14-18-20-22 | 299×30-32-36-38-40 |
28×3-3.5-4-5-6 | 114×4.5-5-6-7-8-10-12-14-18-20 | 325×8-12-14-18-38 |
32×3.5-4-5-6-8 | 121×4.5-5-6-7-8-10-12-14-16-20 | 325×28-32-34-38 |
34×4-5-6-8 | 127×4.5-5-6-7-8-10-12-14-16-20 | 351×10-16-20-25-40 |
36×3.5-5-6-8 | 133×4.5-6-8-12-14-16-18-20-25-30 | 355×6-18-20-25-30-40 |
38×4-5-6-7-8-9-10 | 140×5-6-7-8-9-10/12-14-16-20-22 | 377×8-12-15-20-24-28 |
39×3.5-5-8-10 | 146×4.5-6-8-12-14-16-18-20-25-30 | 377×30/37/40 |
42×3.5-4-5-6-7-8-9-10 | 152×4.5-6-8-12-14-16-18-20-25-30 | 402×10/15-20-25-30-35 |
45×3.5-4-5-6-7-8-9 | 159×4.5-6-10-12-14 | 406×10/20-25-28-35-40 |
48×3.5-4-5-6-7-8-9-10 | 159×16-18-20-22-25-30 | 426×10/12-14-16-20-25-30-35-40 |
51×3.5-4-5-6-7-8-9-10 | 168×8-10/12/14/20/25/30/35 | 450×10/12-14-16-20-25-34-40 |
56×3.5-4-5-6-7-8-9-10 | 180×8-12-16-25-30 | 480×10/ 12 14 16 18 20 25 30 40 |
57×3.5-5-6-7-8-9-10-12 | 180×32-34-38-40 | 500×10/12-14-16-20-25-34-40 |
60×3.5-4.5-5-6-7-8-9-12-14 | 194×6-8-12-16-20-25-30-40 | 510×10/12-14-16-20-25-34-40 |
63×3.5-4.5-5-6-7-8-9-10-12-14 | 203×6-7-10-15-20-25-30 | 530×10/ 12 14 16 18 20 30-40 |
68×4-4.5-5-6-7-8-9-10-12-14-16 | 203×32-36-40 | - |
70×4-4.5-5-6-7-8-9-10-12-15-16 | 219×6-8-12-16-18-20-25 | - |
II. Detailed explanation of core size parameters
a. Outer diameter range:
Hot-rolled tubes: ≥32 mm (maximum up to 630–900 mm)
Cold-rolled/cold-drawn tubes: 5–200 mm (precision tubes as small as 5 mm)
b. Wall thickness grading:
Hot-rolled: 2.5–75 mm (thick-walled tubes up to 200 mm)
Cold-rolled: 0.25–12 mm (ultra-thin wall ≤ 0.25 mm)
c. Length standards:
Hot-rolled fixed length: 6 m/12 m; non-fixed length: 3–12 m
III. Tolerance requirements for seamless steel pipes under certain national and international standards
Chinese national standards
| Standard | Outer Diameter Tolerance | Wall Thickness Tolerance | Applicable Range |
|---|---|---|---|
| GB/T 17395-2024 | ±1.0% of outer diameter or ±0.50mm (whichever is greater) For outer diameter > 219.1mm: ±0.75% of outer diameter or ±3.2mm (whichever is smaller) | ±10% (for wall thickness ≤ 15mm) or ±1.5mm (for wall thickness > 15mm) | General purpose seamless steel pipe |
| GB/T 3639-2021 | Outer diameter ≤ 30mm: ±0.10mm Outer diameter 30-60mm: ±0.15mm Outer diameter 60-200mm: ±0.20mm to ±1.0mm (graded by wall thickness) | ±10% (minimum ±0.12mm) | Cold drawn/cold rolled precision seamless steel pipe |
| GB/T 8162-2018 | ±1.0% of outer diameter (minimum ±0.50mm) | ±12.5% (for wall thickness ≤ 15mm) or ±10% (for wall thickness > 15mm) | Structural seamless steel pipe |
| GB/T 8163-2018 | ±1.0% of outer diameter (minimum ±0.50mm) | ±12.5% (for wall thickness ≤ 15mm) or ±10% (for wall thickness > 15mm) | Fluid conveying seamless steel pipe |
| GB/T 5310-2023 | Outer diameter ≤ 114.3mm: ±0.75% Outer diameter > 114.3mm: ±1.0% | ±8% (for wall thickness > 10mm) | High-pressure boiler seamless steel pipe |
International standards
| Standard | Outer Diameter Tolerance | Wall Thickness Tolerance | Applicable Range |
|---|---|---|---|
| ISO 1087 | ±1.0% of outer diameter (minimum ±0.50mm) | ±12.5% (for wall thickness ≤ 15mm) or ±10% (for wall thickness > 15mm) | General purpose seamless steel pipe |
| ASTM A53 | ±1.0% of outer diameter (minimum ±0.50mm) | ±12.5% (for wall thickness ≤ 15mm) or ±10% (for wall thickness > 15mm) | Fluid conveying seamless steel pipe |
| EN 10217 | ±1.0% of outer diameter (minimum ±0.50mm) | ±12.5% (for wall thickness ≤ 15mm) or ±10% (for wall thickness > 15mm) | General purpose seamless steel pipe |
American standard
| Standard | Outer Diameter Tolerance | Wall Thickness Tolerance | Applicable Range |
|---|---|---|---|
| ASTM A53 | ±1.0% of outer diameter (minimum ±0.50mm) | ±12.5% (for wall thickness ≤ 15mm) or ±10% (for wall thickness > 15mm) | Fluid conveying seamless steel pipe |
| ASTM A106 | ±1.0% of outer diameter (minimum ±0.50mm) | ±12.5% (for wall thickness ≤ 15mm) or ±10% (for wall thickness > 15mm) | General purpose seamless steel pipe |
European standard
| Standard | Outer Diameter Tolerance | Wall Thickness Tolerance | Applicable Range |
|---|---|---|---|
| EN 10217 | ±1.0% of outer diameter (minimum ±0.50mm) | ±12.5% (for wall thickness ≤ 15mm) or ±10% (for wall thickness > 15mm) | General purpose seamless steel pipe |
| EN 10216 | ±1.0% of outer diameter (minimum ±0.50mm) | ±12.5% (for wall thickness ≤ 15mm) or ±10% (for wall thickness > 15mm) | High-pressure boiler seamless steel pipe |
Japanese standard
| Standard | Outer Diameter Tolerance | Wall Thickness Tolerance | Applicable Range |
|---|---|---|---|
| JIS G3461 | ±1.0% of outer diameter (minimum ±0.50mm) | ±12.5% (for wall thickness ≤ 15mm) or ±10% (for wall thickness > 15mm) | General purpose seamless steel pipe |
| JIS G3462 | ±1.0% of outer diameter (minimum ±0.50mm) | ±12.5% (for wall thickness ≤ 15mm) or ±10% (for wall thickness > 15mm) | Fluid conveying seamless steel pipe |
German standard
| Standard | Outer Diameter Tolerance | Wall Thickness Tolerance | Applicable Range |
|---|---|---|---|
| DIN 2462 | ±1.0% of outer diameter (minimum ±0.50mm) | ±12.5% (for wall thickness ≤ 15mm) or ±10% (for wall thickness > 15mm) | General purpose seamless steel pipe |
| DIN 17458 | ±1.0% of outer diameter (minimum ±0.50mm) | ±12.5% (for wall thickness ≤ 15mm) or ±10% (for wall thickness > 15mm) | High-pressure boiler seamless steel pipe |
IV. Selection of seamless steel pipe specifications for industrial pipelines
| Field | Typical Specifications (Outer Diameter × Wall Thickness) | Selection Reasons | Other Related Requirements |
|---|---|---|---|
| Petroleum and Natural Gas Pipelines | Φ219×6mm, Φ325×8mm, Φ426×10mm, Φ630×12mm | - High Pressure Resistance: Petroleum and natural gas pipelines need to withstand high pressure, with strict wall thickness tolerance requirements (±8%) to ensure the safety and reliability of the pipelines. - Long-distance Transmission: Large-diameter, thick-walled steel pipes are suitable for long-distance transmission of oil and natural gas. | - Material: High-strength carbon steel or alloy steel, such as X65, X70, etc., are usually selected to meet the requirements of corrosion resistance and high pressure resistance. - Corrosion Protection: Both inner and outer walls usually need to be treated with corrosion protection, such as three-layer PE corrosion-resistant coating. |
| Chemical Pipelines | Φ108×6mm, Φ159×8mm, Φ219×10mm, Φ325×12mm | - Corrosion Resistance: Chemical pipelines need to be corrosion-resistant, usually using corrosion-resistant alloy steel, such as 304, 316, etc. - Thick Wall Design: Thick-walled steel pipes can withstand higher pressure and corrosive environments. | - Welding Requirements: Good welding performance is needed to ensure the sealing and integrity of the equipment. - Material: Depending on the corrosiveness of the conveyed medium, special alloy steel or stainless steel may be required. |
| Urban Gas Pipelines | Φ114×4mm, Φ168×5mm, Φ219×6mm | - Medium and Low Pressure Transmission: Urban gas pipelines are mainly used for medium and low pressure gas transmission, ensuring the sealing and safety of the pipelines. - Cost-effectiveness: Selecting steel pipes with appropriate wall thickness to balance cost and performance. | - Material: Carbon steel, such as Q235, Q345, etc., is usually selected to meet the requirements of cost-effectiveness and durability. - Corrosion Protection: Corrosion protection treatment is required, such as epoxy powder coating. |
| Industrial Steam Pipelines | Φ89×4mm, Φ108×5mm, Φ159×6mm, Φ219×8mm | - High Temperature and Pressure Resistance: Steam pipelines need to withstand high temperature and pressure, with strict wall thickness tolerance requirements (±10%) to ensure the safety of the pipelines. - Thermal Expansion: The impact of thermal expansion needs to be considered, and appropriate supports and compensation devices should be selected. | - Material: High-temperature alloy steel, such as 12Cr1MoV, is usually selected to meet the requirements of high temperature and pressure resistance. - Insulation Treatment: Insulation treatment is required to reduce heat loss. |
| Seawater Conveyance Pipelines | Φ325×10mm, Φ426×12mm, Φ630×14mm | - Seawater Corrosion Resistance: Seawater conveyance pipelines need to be resistant to seawater corrosion, usually using corrosion-resistant alloy steel or stainless steel. - High Pressure Transmission: Large-diameter, thick-walled steel pipes are suitable for high-pressure seawater conveyance. | - Material: Corrosion-resistant alloy steel, such as 316L, 2205, etc., is usually selected to meet the requirements of corrosion resistance. - Corrosion Protection: Both inner and outer walls usually need to be treated with corrosion protection, such as epoxy powder coating or glass flake coating. |
| Industrial Wastewater Pipelines | Φ108×6mm, Φ159×8mm, Φ219×10mm | - Corrosion Resistance: Industrial wastewater pipelines need to be corrosion-resistant, usually using corrosion-resistant alloy steel or stainless steel. - Thick Wall Design: Thick-walled steel pipes can withstand higher pressure and corrosive environments. | - Material: Depending on the corrosiveness of the wastewater, special alloy steel or stainless steel may be required. - Corrosion Protection: Corrosion protection treatment is required, such as epoxy powder coating or glass flake coating. |
V. Comparison of international standards for seamless steel pipes
| Standard | Outer Diameter Range | Wall Thickness Range | Material Requirements | Dimensional Accuracy Requirements |
|---|---|---|---|---|
| China GB/T 17395-2024 | 10mm-660mm | 0.5mm-70mm | Includes carbon structural steel, alloy structural steel, and various other materials | Outer diameter tolerance ±1.0% of outer diameter (minimum ±0.50mm), wall thickness tolerance ±12.5% (for wall thickness ≤ 15mm) or ±10% (for wall thickness > 15mm) |
| International Standard ISO 1127 | 10mm-660mm | 0.5mm-70mm | Similar to GB/T 17395-2024, covering a variety of materials | Outer diameter tolerance ±1.0% of outer diameter (minimum ±0.50mm), wall thickness tolerance ±12.5% (for wall thickness ≤ 15mm) or ±10% (for wall thickness > 15mm) |
| USA ASTM A53 | 10.3mm-609.6mm | 1.65mm-76.2mm | Typically carbon steel material | Outer diameter tolerance ±1.0% of outer diameter (minimum ±0.50mm), wall thickness tolerance ±12.5% (for wall thickness ≤ 15mm) or ±10% (for wall thickness > 15mm) |
| European Standard EN 10217 | 10mm-660mm | 0.5mm-70mm | Includes carbon structural steel, alloy structural steel, and various other materials | Outer diameter tolerance ±1.0% of outer diameter (minimum ±0.50mm), wall thickness tolerance ±12.5% (for wall thickness ≤ 15mm) or ±10% (for wall thickness > 15mm) |
| Japan JIS G3461 | 10mm-660mm | 0.5mm-70mm | Includes carbon structural steel, alloy structural steel, and various other materials | Outer diameter tolerance ±1.0% of outer diameter (minimum ±0.50mm), wall thickness tolerance ±12.5% (for wall thickness ≤ 15mm) or ±10% (for wall thickness > 15mm) |
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E-mail：wr@insulatedpipeline.com
E-mail：wyy@insulatedpipeline.com
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