BS 3601
BS 3601 Steel Pipe
BS 3601 is a renowned specification for carbon steel pipes and tubes with specified room temperature properties for pressure purposes. This standard, published by the British Standards Institution (BSI), the national standards body of the United Kingdom, outlines the requirements for plain end, welded, and seamless carbon steel tubes suitable for general pressure purposes. When you choose tubes manufactured in accordance with BS 3601, you are assured of their specified room temperature properties. Furthermore, the production process and methods adhering to this standard are a testament to its quality and reliability, ensuring that your projects meet the highest standards.
BS 3601 Specification
Our BS 3601 steel pipes and tubes come with precise dimensions, ensuring a perfect fit for your projects. They undergo rigorous production procedures, are available in various steel grades, and can be coated with different surface coatings to enhance durability. Whether you need plain end, welded, or seamless tubes, we have them all. Additionally, we offer various end types, joint methods, and machining services, ensuring that you get a product tailored to your specific needs.
| Production Standard | BS3601 |
| Manufacturing Processes | BW ERW SMLS SAW |
| Outside Diameter | BW: 8-50mm ERW:12.7-508mm SMLS:12.7mm -1016mm SAW: 114.3-2220mm |
| Wall Thickness | BW: up to 4.5mm ERW:up to 12.5mm SMLS: up to 65mm SAW: up to 50mm |
| Pipe Length | specific random |
| Steel Grade | 320 360 430 (ERW320 ERW360 ERW430) |
| Corrosion Prevention | Lacquer, Varnish, Oiling, Galvanizing |
| End Processes | Square Cut, Bevelling, Threading, Socket |
| Further Processing | Welding, Bending, Hole Drilling, Punching, Swaging, Tapering, Flaring, Expanding |
BS 3601 Dimension Table
Our BS 3601 tubes and pipes are available in a comprehensive range of dimensions to suit diverse requirements. From small diameter tubes for intricate applications to large diameter pipes for industrial use, we have them all. Each dimension is meticulously crafted to ensure a snug fit and seamless integration into your projects.
| Method of Manufacture | Outside Diameter | Thickness |
|---|---|---|
| mm | mm | |
| Buttwelded | 8 to 50 （nominal size） | Up to and including 4.5 |
| Electric Resistance Welded | 12.7 to 508 | Up to and including 12.5 |
| Seamless | 12.7 to 1016 | Up to and including 65 |
| Submerged Arc Welded | 114.3 to 2220 | Up to and including 50 |
Chemical Requirements of BS 3601
Our BS 3601 steel pipes and tubes meet stringent chemical requirements. They are manufactured using high-quality raw materials that undergo rigorous testing to ensure they meet the chemical composition standards set by the BSI. This ensures that our products are not only durable but also resistant to corrosion, ensuring longevity and reliability in any application.
| Steel Grade | Method of Manufacture | Chemical Composition（ladle analysis） （see notes 1 and 2） | Mechanical Properties at Room Temperature（see note 3） | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| C | Si | Mn | P | S | Rm | Remin For thickness in mm | A | Bend test bar diameter | ||||||
| max | max | min | max | max | max | min | max | ≤16 | ＞16≤40 | ＞40≤65 | min | |||
| – | – | % | % | % | % | % | % | N/mm2 b | N/mm2 | N/mm2 | N/mm2 | N/mm2 | % | |
| 320 | Welded（BW and ERW） | 0.16a | – | 0.3 | 0.7 | 0.04 | 0.04 | 320 | 460 | 195 | – | – | 25 | – |
| 360 | Seamless（S） | 0.17 | 0.35 | 0.4 | 0.8 | 0.04 | 0.04 | 360 | 500 | 235 | 225 | 215 | 25 | 4a |
| Welded（ERW） | 0.17a | 0.35 | 0.4 | 0.8 | 0.04 | 0.04 | 360 | 500 | 235 | – | – | 25 | – | |
| 430 | Seamless（S） | 0.21 | 0.35 | 0.4 | 1.2 | 0.04 | 0.04 | 430 | 570 | 275 | 265 | 255 | 22 | 4a |
| Welded（ERW） | 0.21 | 0.35 | 0.4 | 1.2 | 0.04 | 0.04 | 430 | 570 | 275 | – | – | 22 | – | |
| Welded（SAW） | 0.25 | 0.50 | – | 1.2 | 0.04 | 0.04 | 430 | 570 | 275 | 265 | 255 | 22 | 4a | |
| ||||||||||||||
Mechanical Requirements of BS 3601
Mechanical integrity is paramount for steel pipes and tubes used in pressure applications. Our BS 3601 products are designed to meet the highest mechanical requirements, ensuring they can withstand the stresses and pressures of their intended use. From tensile strength to elongation and impact values, our products are tested to ensure they meet and exceed the mechanical standards set by BSI.
| Steel Grade | Method of Manufacture | Chemical Composition（ladle analysis） （see notes 1 and 2） | Mechanical Properties at Room Temperature（see note 3） | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| C | Si | Mn | P | S | Rm | Remin For thickness in mm | A | Bend test bar diameter | ||||||
| max | max | min | max | max | max | min | max | ≤16 | ＞16≤40 | ＞40≤65 | min | |||
| – | – | % | % | % | % | % | % | N/mm2 b | N/mm2 | N/mm2 | N/mm2 | N/mm2 | % | |
| 320 | Welded（BW and ERW） | 0.16a | – | 0.3 | 0.7 | 0.04 | 0.04 | 320 | 460 | 195 | – | – | 25 | – |
| 360 | Seamless（S） | 0.17 | 0.35 | 0.4 | 0.8 | 0.04 | 0.04 | 360 | 500 | 235 | 225 | 215 | 25 | 4a |
| Welded（ERW） | 0.17a | 0.35 | 0.4 | 0.8 | 0.04 | 0.04 | 360 | 500 | 235 | – | – | 25 | – | |
| 430 | Seamless（S） | 0.21 | 0.35 | 0.4 | 1.2 | 0.04 | 0.04 | 430 | 570 | 275 | 265 | 255 | 22 | 4a |
| Welded（ERW） | 0.21 | 0.35 | 0.4 | 1.2 | 0.04 | 0.04 | 430 | 570 | 275 | – | – | 22 | – | |
| Welded（SAW） | 0.25 | 0.50 | – | 1.2 | 0.04 | 0.04 | 430 | 570 | 275 | 265 | 255 | 22 | 4a | |
| ||||||||||||||
Production Tolerance of BS 3601
Where the legth is specifed as “exact length” or“cut length”, the permissible deviation shall be + 6, -0 mm for lengths up to and including 6 m.For every 3 m increase in length above 6 m, the plus tolerance shall be increased by 1.5 mm with a maximum of 12.0 mm.
| Outside diameter: | |
|---|---|
| up to and including 168.3 mm | ±1 % with a minimum tolerance of± 0.50 mm |
| over 168.3 mm | ±0.75 % |
| Thickness: | ±10 % |
| Outside diameter: | ±1 % with a minimum tolerance of± 0.50 mm |
| Thickness as a percentage of outside diameter: | |
| up to and including 3 % | ±15 % |
| over 3 % | ±12.5 % |
