Advantages and Disadvantages of Black Steel Pipes UNIASEN

BS 3601 Steel Pipes

Standard Overview:

BS 3601 specifies requirements for carbon steel pipes and tubes. They are for pressure use, especially at room temperature.

Main Material:

Carbon steel, particularly grades such as Grade 360.

Scope of Application:

BS 3601 is widely used in industries such as construction, oil and gas, and manufacturing where durable piping systems are required. Typically used for pressure vessels, piping and structural applications.

Available in both black and galvanized finishes, BS 3601 is ideal for fire protection applications. While they are flexible to bend, it is not recommended if the inside diameter of the bend is less than twelve times the outside diameter of the pipe.

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Specification of BS 3601 Steel Pipes

StandardBS3601
ProcedureBW, ERW, SMLS, SAW
DimensionsBW: 8-50mm, DN6 – DN1000
ERW: 12.7-508mm
SMLS: 12.7mm -1016mm
SAW: 114.3-2220mm
ThicknessBW: up to 4.5mm
ERW: up to 12.5mm
SMLS: up to 65mm
SAW: up to 50mm
Unit Lengthspecific, random
Steel Grade320 360 430 (ERW320 ERW360 ERW430)
Surface CoatingVarnishing, Oiling, Hot Dip Galvanizing
End TypeSquare cut, Plain, Bevelled, Threaded, Socket
Joint MethodFitting, Flange, Coupling, Clamp, Pipe Shoulder, Welding
Pipe MachiningWelding, Bending, Hole Drilling, Punching, Swaging, Tapering, Flaring, Expanding

Dimension

Method of
Manufacture
Outside DiameterThickness
mmmm
Buttwelded8 to 50
(nominal size)
Up to and including 4.5
Electric Resistance
Welded
12.7 to 508Up to and including 12.5
Seamless12.7 to 1016Up to and including 65
Submerged Arc
Welded
114.3 to 2220Up to and including 50

Chemical Requirement

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 Requirement

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.

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