Electric Resistance Welded Tube (ERW)

EN 10305:2010 PART 3 AND 5 E220

Typical market sectors for the use of ERW would include Furniture, Fabrications, Display/Shop fittings, Storage/Racking, Automotive.

Supplied in the following conditions:

  • Commercial Quality
  • Sculptured
  • Pre-Galvanised
  • Aluminised
  • Mechanical Properties
  • Tolerances
  • Chemical Composition - Ladle Analysis
  • Size Chart - Round
  • Size Chart - Rectangular
  • Size Chart - Square
  • Size Chart - Flat Sided Oval
  • Size Chart - Eliptical Oval
  • Sculptured Tube
  • Size Chart - 'D' & Trapezoidal
  • Lacquered & Coated Tube
  • Pre-Galvanised
  • Size Chart - Tunnel
Mechanical Properties
Condition Yield Tensile Elongation
N/mm2 Re min
N/mm2
Re min
% min
KM as welded+CR2 220 310 23
Tolerances
Outside Diameter
Over Up to and Including KM Condition
D/a ≤ 40
“GKM, NKM”
D/a ≤ 20
GKM, NKM
20 < D/a ≤ 40
All Conditions
D/a > 40
mm mm mm +/- mm +/- mm +/-
20 0.12 0.18 1.24
20 30 0.15 0.22 0.30
30 50 0.20 0.30 0.40
50 70 0.25 0.37 0.50
70 90 0.30 0.45 0.60
90 110 0.35 0.52 0.70
110 130 0.45 0.68 0.90
130 150 0.55 0.82 1.10
n.b The tolerance on outside diameter includes ovality
Wall Thickness

The tolerance including eccentricity but excluding the weld, shall be:

a) thickness less 3mm: +/- 10%

b) thickness 3mm and over: +/- 8%

Concavity/Convexity

The maximum concave or convex deflection of a flat side of a square or rectangular section of tube shall not exceed 0.5% of the nominal length of that side.

Weld Height

The maximum height of the internal weld shall not exceed 60% of the specified thickness.

Straightness

Tubes shall not depart from straightness by more than 1.5 in 1000.

Chemical Composition – Ladle Analysis

BS EN 10305: 2010 Part 3 & 5 E220

C Si Mn P S
max % max % max % max % max %
0.14 0.35 0.70 0.025 0.025
Size Chart – Round

Also Available in BS EN 10305-3: 2010

O.D (mm) Wall 0.71 0.81 0.91 1.00 1.22 1.50 1.63 2.00 2.03 2.50 2.64 2.95 3.25 3.50 4.06 4.88
O.D.
9.53 x x
10.00 x x x
12.00 x x x
12.70 x x x x
13.50 x
14.00 x x
15.00 x x x
15.88 x x x x x x x x
16.00 x x x x
17.20 x
18.00 x x x x x
19.05 x x x x x x x
20.00 x x x
21.30 x
22.00 x x
22.22 x x x x x x x
25.00 x x x x x x x
25.40 x x x x x x x x
26.98 x x
28.00 x x
28.58 x x x x x x
30.00 x x
31.75 x x x x x x x
33.70 x
34.93 x x x x x
35.00 x x
38.10 x x x x x x x
40.00 x x
41.28 x x x x
44.45 x x x x x x
45.00 x x
47.63 x x x x x
50.00 x x
50.80 x x x x x x x
53.98 x x x
57.15 x x x x
60.00 x x x
60.33 x x x
63.50 x x x x x x
66.68 x
69.85 x x x x
76.10 x x x x x x
80.00 x x
88.90 x x x x
101.60 x x x x x x
108.00 x
114.30 x x x
127.00 x x x
133.00 x
139.70 x
152.40 x x
Size Chart – Rectangular

Also Available in BS EN 10305-5: 2010

Wall 0.91 1.00 1.22 1.50 1.63 2.00 2.03 2.34 2.50 2.64 3.00
20.00 x 10.00 x x
20.00 x 15.00 x x x
25.00 x 10.00 x
25.00 x 12.00 x
25.00 x 15.00 x x x
25.00 x 20.00 x x x x
25.40 x 12.70 x x x
30.00 x 10.00 x x x
30.00 x 15.00 x x x
30.00 x 20.00 x x x x x
30.00 x 25.00 x x
31.75 x 15.88 x x x x
31.75 x 19.05 x x x
34.93 x 15.88 x x x x
35.00 x 15.00 x x
35.00 x 16.00 x x
35.00 x 20.00 x x
38.10 x 12.70 x
38.10 x 19.05 x x x x
38.10 x 25.40 x x x
40.00 x 10.00 x
40.00 x 15.00 x x
40.00 x 20.00 x x x x
40.00 x 25.00 x x x
40.00 x 30.00 x x
45.00 x 20.00 x x
45.00 x 25.00 x x x
45.00 x 30.00 x x
47.63 x 23.81 x x
50.00 x 10.00 x
50.00 x 15.00 x
50.00 x 20.00 x x
50.00 x 25.00 x x x x
50.00 x 30.00 x x
50.00 x 34.00 x
50.00 x 40.00 x x x
50.80 x 25.40 x x x x x
50.80 x 38.10 x x
60.00 x 20.00 x x x
60.00 x 25.00 x x
60.00 x 30.00 x x x
60.00 x 40.00 x x
63.50 x 25.40 x x
63.50 x 38.10 x x x
70.00 x 20.00 x x
70.00 x 25.00 x
70.00 x 30.00 x
70.00 x 40.00 x
70.00 x 50.00 x
75.00 x 25.00 x x x
80.00 x 20.00 x x
80.00 x 30.00 x x
80.00 x 40.00 x x
100.00 x 25.00 x
100.00 x 30.00 x
100.00 x 34.00 x
100.00 x 40.00 x
100.00 x 50.00 x
120.00 x 60.00 x x
Size Chart – Square


Also Available in BS EN 10305-5: 2010

Wall 0.91 1.00 1.22 1.50 1.63 2.00 2.03 2.34 2.50 2.64 3.00 3.25
10.00 x 10.00 x x
12.00 x 12.00 x
12.70 x 12.70 x x x x
15.88 x 15.88 x x x x x
16.00 x 16.00 x x x
18.00 x 18.00 x
19.05 x 19.05 x x x x x
20.00 x 20.00 x x x x
22.22 x 22.22 x x x x x
25.00 x 25.00 x x x x x
25.40 x 25.40 x x x x x x x
28.58 x 28.58 x x x x
30.00 x 30.00 x x x x x
31.75 x 31.75 x x x x x
34.93 x 34.93 x x x x
35.00 x 35.00 x x x
38.10 x 38.10 x x x x x x
40.00 x 40.00 x x x x x
45.00 x 45.00 x x x
50.00 x 50.00 x x x x
50.80 x 50.80 x x x x x
60.00 x 60.00 x x x
80.00 x 80.00 x
90.00 x 90.00 x
100.00 x 100.00 x
Size Chart – Flat Sided Oval


Also Available in BS EN 10305-3: 2010

Wall 1.00 1.22 1.50 1.63 2.00 2.03 2.64 2.95
20.00 x 10.00 x
25.00 x 12.00 x
30.00 x 15.00 x x
30.00 x 16.00 x
31.75 x 15.88 x x x x x
35.00 x 15.00 x
35.00 x 20.00 x x
38.10 x 25.40 x x x x
40.00 x 20.00 x x x x
41.28 x 22.22 x x x x
41.70 x 22.61 x x x x
44.45 x 19.05 x
45.00 x 17.00 x
45.00 x 20.00 x x x x
50.00 x 20.00 x
50.00 x 25.00 x x
60.00 x 20.00 x
60.00 x 30.00 x x
66.68 x 33.34 x x
70.00 x 20.00 x x x
127.00 x 19.00 x
Size Chart – Eliptical Oval

Wall 1.00 1.22 1.50 1.63 2.00 2.03 2.64 2.95
18.72 x 12.62 x
22.22 x 12.70 x x x x
23.50 x 13.34 x x x x
26.29 x 16.21 x x x x
32.00 x 17.50 x x x x
38.10 x 25.40 x x x x
Sculptured Tube

Sculptured tube has an embossed outside diameter making it suitable for practical and decorative applications. The embossed surface also increases its strength by up to 50%. Sculptured tube is produced in a series of standard patterns.

Typical Applications

  • Transport hand rail systems
  • Furniture
  • Ladder rungs
  • Shop fittings
  • Exhibition stands
  • Grip rails

Various sections are available ex stock in a wide range of gauges and sizes.

Size Chart – ‘D’ & Trapezoidal

Wall 1.00 1.22 1.50 1.63 2.00 2.03 2.64 2.95
D’ Section 40.00 x 20.00 x x x x
Trapezoidal 60.00 x 30.00 x x x x
Lacquered & Coated Tube

The manufacturing process of coated tube is accomplished automatically ‘in-line,’ quite unlike any other galvanised tube. The consistency of coating is controlled to tolerances unequalled by any other process. The combination of cold forming, heating and rapid cooling inherent in the coating process enhances the mechanical properties of the tube, resulting in higher tensile strength. Its high lustre and smooth coating provides a far superior surface finish to either Pre-galvanised or ‘Hot-Dip’ galvanised along with exceptional corrosion resistance due to the synergy between triple coatings.

Pre-Galvanised

When finished products require internal galvanising we can supply tube manufactured from pre-galvanised strip. The weld zone area is spray repaired after the removal of the external fin.

BS 2982 EN 10142
Z2 DX5 1D+Z/+ZF
Z28 S280GD+Z/+ZF
Z35 S350GD+Z/+ZF
Size Chart – Tunnel

Wall 1.00 1.22 1.50 1.63 2.00 2.03 2.64 2.95
35.00 x 30.00 x x
60.00 x 25.00 x x
60.00 x 30.00 x x

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