bS 6323

BS-6323-STEEL-PIPE

BS 6323 Steel Pipe

Our steel tubes are manufactured in strict adherence to the BS 6323 standard, a benchmark set by the renowned British Standards Institution (BSI). This ensures that you receive seamless steel tubes that are perfect for automobile, mechanical, and general engineering purposes. Our tubes undergo a seamless manufacturing process and are cold-finished, ensuring the highest quality and precision. With the BSI’s stringent standards as our guiding principle, you can trust in the robustness, durability, and reliability of our products.

BS 6323 Specification

Our steel tubes are meticulously designed to meet the diverse specifications of the BS 6323 standard. With dimensions up to 230 mm outside diameter, we offer a range of production procedures. The steel grades we provide range from 3 to 11, ensuring the right fit for your requirements. Our tubes come with various surface coatings, end types, joint methods, and additional machining services, guaranteeing a product that aligns with your specific needs and enhances your operational efficiency.

StandardBS 6323
UsageSeamless and welded steel tubes for automobile,mechanical and general engineering porpose.
Producing ProcessBy seamless and ERW
Delivery conditionHot finished condition
Steel GradeHFS3/HFS4/HFS5/HFS8
Pipe EndsPE/BE/THREAD/GROOVED
Surface ProtectionBare/Vanishe/Galvanized/3LPE/Oil…
Chemical CompositiomC %Si %Mn %P %S %
HFS3≤0.20≤0.35≤0.90≤0.05≤0.05
HFS4≤0.25≤0.35≤1.2≤0.05≤0.05
HFS5≤0.23≤0.50≤1.5≤0.05≤0.05
HFS80.40-0.55≤0.350.50-0.90≤0.05≤0.05
Mechanical PropertiesYield Strength   MPaTensile Strength  MPaElongation  %
HFS3215360≥24
HFS4235410≥22
HFS5340490≥20
HFS8340540≥18
ToleranceOutside Diameter±1% with a minium of ±0.5mm
Wall Thickness≤3% of the outside diameter±15%
>3% of the outside diameter15%/-12.5%
Length≤6m-0/+10mm
>6m-0/+15mm
Required testFlattening test
Bend test

BS 6323 Dimension Table

schematic-diagram-of-pipe-dimension

Our comprehensive dimension table is a testament to the precision and variety we offer. Ranging up to 230 mm in outside diameter, our tubes are crafted to fit seamlessly into your projects. Whether you’re looking for specific lengths, diameters, or wall thicknesses, our dimension table provides a clear and concise guide, ensuring you find the perfect tube dimension for your engineering needs, optimizing performance and reducing wastage.

Dimensions of hot finished welded steel tubes
Outside diameterDesignation HFW 2 and 3 ThicknessDesignation HFW 4 and 5 Thickness
mmmmmmmmmmmmmm
21.32.02.63.23.2
26.92.32.63.23.2
33.72.63.24.02.63.24.0
42.42.63.24.02.63.24.0
48.32.93.24.03.24.05.0
60.32.93.64.53.24.05.0
76.13.23.64.53.24.05.0
88.93.24.05.03.24.05.0
114.33.64.55.43.65.06.3
139.76.36.3

Chemical Requirements of BS 6323

Understanding the importance of material composition, our steel tubes are formulated to meet the stringent chemical requirements of the BS 6323 standard. This ensures that you benefit from tubes that offer superior corrosion resistance, enhanced durability, and optimal performance under various conditions. With our tubes, you’re investing in materials that are chemically sound, ensuring longevity and reliability in all your projects.

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 6323

Our steel tubes are engineered to meet the rigorous mechanical requirements of the BS 6323 standard. This guarantees that you receive products with optimal strength, flexibility, and resilience. Whether you’re dealing with high-pressure environments or demanding mechanical applications, our tubes are designed to withstand and deliver, ensuring your projects run smoothly and efficiently.

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.

Steel Grades in BS 6323

The choice of steel grade can significantly influence the performance of the final product. We offer tubes in steel grades 3, 3A, 4, 5, 6, 7, 8, 9, 10, and 11. Each grade is tailored to specific applications, ensuring optimal performance. By specifying your desired grade during the enquiry, you can be assured of a product that aligns perfectly with your project’s requirements.

Production Tolerance of BS 6323

The tolerance on thickness, including eccentricity and weld upset, shall be – 7.5 % with a minimum of – 0.1 mm. If the outside and inside diameters are specified, the eccentricity shall be restricted so that the thickness does not deviate by more than – 7.5 % of the actual measured mean thickness.

Thickness. 

Where tubes are specified by outside diameter and thickness, the tolerance on thickness, including eccentricity, shall be:

up to and including 3 % of outside diameter: ±15%

over 3 % of outside diameter: ±15 %, ±12.5%


Outside diameter. Where tubes are specified by outside diameter and thickness, the tolerance on the outside diameter, including ovality, shall be ± 1 % with a minimum of ± 0.5 mm.

NOTE Tolerances on diameters are not given in this part of BS 6323 for tubes specified by outside diameter and inside diameter. The tolerances to be applied should be agreed between the purchaser and the manufacturer at the time of enquiry and order.


Length. All tubes shall be supplied in either:

a) random lengths, as agreed between purchasel and manufacturer, or

b) specified cut lengths to the following tolerances:

up to and including 6 000 mm: + 10 -0 mm

over 6 000 mm:+15mm – 0 mm

NOTE: Closer tolerances on length may be obtained by agreement between the purchaser and the manufacturer.

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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