BS 3601

bs-3061-steel-pipe

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 StandardBS3601
Manufacturing ProcessesBW  ERW  SMLS  SAW
Outside DiameterBW: 8-50mm
ERW:12.7-508mm
SMLS:12.7mm -1016mm
SAW: 114.3-2220mm
Wall ThicknessBW: up to 4.5mm
ERW:up to 12.5mm
SMLS: up to 65mm
SAW: up to 50mm
Pipe Lengthspecific
random
Steel Grade320 360 430 (ERW320 ERW360 ERW430)
Corrosion PreventionLacquer, Varnish, Oiling, Galvanizing
End ProcessesSquare Cut, Bevelling, Threading, Socket
Further ProcessingWelding, Bending, Hole Drilling, Punching, Swaging, Tapering, Flaring, Expanding

BS 3601 Dimension Table

schematic-diagram-of-pipe-dimension

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 ManufactureOutside DiameterThickness
mmmm
Buttwelded8 to 50 (nominal size)Up to and including 4.5
Electric Resistance Welded12.7 to 508Up to and including 12.5
Seamless12.7 to 1016Up to and including 65
Submerged Arc Welded114.3 to 2220Up 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 GradeMethod of ManufactureChemical Composition(ladle analysis)
(see notes 1 and 2)
Mechanical Properties at Room Temperature(see note 3)
CSiMnPSRmRemin
For thickness in mm
ABend test bar
diameter
maxmaxminmaxmaxmaxminmax≤16>16≤40>40≤65min
%%%%%%N/mm2 bN/mm2N/mm2N/mm2N/mm2% 
320Welded(BW and ERW)0.16a0.30.70.040.0432046019525
360Seamless(S)0.170.350.40.80.040.04360500235225215254a
Welded(ERW)0.17a0.350.40.80.040.0436050023525
430Seamless(S)0.210.350.41.20.040.04430570275265255224a
Welded(ERW)0.210.350.41.20.040.0443057027522
Welded(SAW)0.250.501.20.040.04430570275265255224a
  • NOTE 1:Elements not quoted in this table are not intentionally added other than for the purpose of finishing the heat.
  • NOTE 2:For permissible deviations on product analysis,see Table 3.
  • NOTE 3: Re is the yield strength. For acceptance purposes either the upper yield stress ReH or the 0.5% proof stress(total elongation)Rt0.5 is determined(see 13.1).
  • Rm is the tensile strength.
  • A is the percentage elongation after fracture on a gauge length of Lo=5.65√So.(So is the original cross-sectional area of the gauge length.)
  • a is the thickness of the test piece.
  • a For welded tubes made from rimmed Steel the C max. is 0.19%.
  • b 1N/mm2 = 1MPa.

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 GradeMethod of ManufactureChemical Composition(ladle analysis)
(see notes 1 and 2)
Mechanical Properties at Room Temperature(see note 3)
CSiMnPSRmRemin
For thickness in mm
ABend test bar
diameter
maxmaxminmaxmaxmaxminmax≤16>16≤40>40≤65min
%%%%%%N/mm2 bN/mm2N/mm2N/mm2N/mm2%
320Welded(BW and ERW)0.16a0.30.70.040.0432046019525
360Seamless(S)0.170.350.40.80.040.04360500235225215254a
Welded(ERW)0.17a0.350.40.80.040.0436050023525
430Seamless(S)0.210.350.41.20.040.04430570275265255224a
Welded(ERW)0.210.350.41.20.040.0443057027522
Welded(SAW)0.250.501.20.040.04430570275265255224a
  • NOTE 1:Elements not quoted in this table are not intentionally added other than for the purpose of finishing the heat.
  • NOTE 2:For permissible deviations on product analysis,see Table 3.
  • NOTE 3: Re is the yield strength. For acceptance purposes either the upper yield stress ReH or the 0.5% proof stress(total elongation)Rt0.5 is determined(see 13.1).
  • Rm is the tensile strength.
  • A is the percentage elongation after fracture on a gauge length of Lo=5.65√So.(So is the original cross-sectional area of the gauge length.)
  • a is the thickness of the test piece.
  • a For welded tubes made from rimmed Steel the C max. is 0.19%.
  • b 1N/mm2 = 1MPa.

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 %

Our Advantages

  1. Over 25 years of experience in pipeline production and installation.
  2. Comprehensive inspection equipment.
  3. Independent product serial numbers for traceability.
  4. Advanced production equipment – Seamer high-frequency welding machine from the United States.
  5. Complete qualifications – API 5L/API 5CT/FM/UL fire pipe certification, etc.
  6. Wide range of products – independently developed solar torque tubes, highly favored in the European market.
  7. Customers spread across the globe.
  8. Excellent after-sales service and sense of responsibility.

Application Scenarios

Our steel pipes are engineered to withstand high temperatures, corrosive environments, and varying pressures, ensuring reliability and safety in the complex petrochemical processes. 

Whether it’s transferring crude oil, natural gas, or chemical intermediates, the robustness and versatility of steel pipes make them indispensable components of the plant’s infrastructure, contributing to efficient production and maintenance of stringent safety standards.

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