BS 3059

seamless steel pipe_Seamless API 5L Line Pipe

BS 3059 Carbon Steel Boiler tube

Standard Overview:

BS 3059 is mainly used for steel pipe specifications for high-pressure boilers and heat exchangers. It defines the technical and quality standards for seamless and welded steel pipes. These pipes are for high-temperature, high-pressure environments.

Main Material:

Carbon steel or low-alloy steel

Scope of Application:

This standard applies to boiler tubes, heat exchanger tubes, and industrial equipment. It is for use in high-temperature, high-pressure conditions, such as in power plants, chemical plants, and refineries.

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Specification of BS 3059 Boiler Tube

Standard BS3059
Procedure HFS, CFS, ERW, CEW
Dimensions OD ≤127mm
Thickness W.T.≤12.5mm
Unit Length 3 – 12mtrs meters
Steel Grade 320 Seamless, 320 Welded
Surface Coating Black lacquer coating,Varnishing, Oiling, Hot Dip Galvanizing, FBE, 2PP, 3PP, 2PE, 3PE
End Type Plain, Bevelled, Threaded, Grooved，Shouldered
Joint Method Fitting, Flange, Coupling, Clamp, Pipe Shoulder, Welding
Pipe Machining Welding, Bending, Hole Drilling, Punching, Swaging, Tapering, Flaring, Expanding

BS 3059 Boiler Tube Dimension

Outside
Diameter		 Tube Thickness （mm）
mm 2.0 2.3 2.6 2.9 3.2 3.6 4.0 4.5 5.0 5.6 6.3 7.1 8.0 8.8 10.0 11.0 12.5
25.4 ● ● ● ● ● ● ● ● ●
26.9 ● ● ● ● ● ● ● ● ●
31.8 ● ● ● ● ● ● ● ● ● ● ●
33.7 ● ● ● ● ● ● ● ● ● ● ●
38 ● ● ● ● ● ● ● ● ● ● ● ● ●
42.4 ● ● ● ● ● ● ● ● ● ● ● ●
44.5 ● ● ● ● ● ● ● ● ● ● ● ● ●
48.3 ● ● ● ● ● ● ● ● ● ● ● ● ●
51 ● ● ● ● ● ● ● ● ● ● ● ● ● ●
57 ● ● ● ● ● ● ● ● ● ● ● ● ●
60.3 ● ● ● ● ● ● ● ● ● ● ● ● ● ●
63.5 ● ● ● ● ● ● ● ● ● ● ● ● ● ●
70 ● ● ● ● ● ● ● ● ● ● ● ● ● ●
76.1 ● ● ● ● ● ● ● ● ● ● ● ● ● ●
82.5 ● ● ● ● ● ● ● ● ● ● ● ● ●
88.9 ● ● ● ● ● ● ● ● ● ● ● ● ●
101.6 ● ● ● ● ● ● ● ● ● ● ● ●
114.3 ● ● ● ● ● ● ● ● ● ● ●
127 ● ● ● ● ● ● ● ● ● ●

BS 3059 Boiler Tube Chemical Requirement

Steel grade Method of manufacture Chemical composition (ladle analysis) (see notes 1 and 2) Mechanical properties at room temperature (see note 3)
C Mn Si P S Re Rm A Flattening test constant C Drift expanding test: increase in D
max. min. max. min. max. max. max. min. min. max. min. d/D ratio
≤ 0.6 >0.6
≤ 0.8		 >0.8
% % % % % % % N/mm2a N/mm2 N/mm2 % – % % %
320 Seamless Welded 0.16 0.30 0.70 0.10 0.35 0.04 0.04 195 320 480 25 0.10 12 15 19
320 Seamless Welded 0.16b 0.30 0.70 – 0.35 0.04 0.04 195 320 480 25 0.10 12 15 19
NOTE 1 Elements not quoted in the 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 may be used (see 13.1).
Rm is the tensile strength.
A is the percentage elongation after fracture on a gauge length Lo = 5.65 √So . (So is the original cross-sectional area of the gauge length.)
d is the inside diameter.
D is the outside diameter.
a 1 N/mm2 = 1 MPa.
b For rimmed or semi-killed steel the C max. is 0.19 %.

BS 3059 Boiler Tube Mechanical Requirement

Steel grade Method of manufacture Chemical composition (ladle analysis) (see notes 1 and 2) Mechanical properties at room temperature (see note 3)
C Mn Si P S Re Rm A Flattening test constant C Drift expanding test: increase in D
max. min. max. min. max. max. max. min. min. max. min. d/D ratio
≤ 0.6 >0.6
≤ 0.8		 >0.8
    % % % % % % % N/mm2a N/mm2 N/mm2 % – % % %
320 Seamless Welded 0.16 0.30 0.70 0.10 0.35 0.04 0.04 195 320 480 25 0.10 12 15 19
320 Seamless Welded 0.16b 0.30 0.70 – 0.35 0.04 0.04 195 320 480 25 0.10 12 15 19
NOTE 1 Elements not quoted in the 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 may be used (see 13.1).
Rm is the tensile strength.
A is the percentage elongation after fracture on a gauge length Lo = 5.65 √So . (So is the original cross-sectional area of the gauge length.)
d is the inside diameter.
D is the outside diameter.
a 1 N/mm2 = 1 MPa.
b For rimmed or semi-killed steel the C max. is 0.19 %.

Why Choose UNIASEN?

  • UNIASEN offers BS 3059 steel pipes in various grades. Each grade meets different operational needs.
  • UNIASEN BS 3059 steel pipes are made to strict tolerances. They cover diameter, thickness, length, and weight. This ensures every pipe meets your exact specs.
  • Our size tables are comprehensive. They list sizes, diameters, and thicknesses. This lets you choose the best pipe for your application.
  • UNIASEN’s BS 3059 steel pipes have detailed specs. They cover every aspect of their construction and manufacture.
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