Electric Resistance Welded Tube (ERW)

Electric-Resistance-Welded-Steel - Download the brochure

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
mm	mm	mm +/-
	20	0.12
20	30	0.15
32	42.40	0.20
44	51	0.25
55	63.50	0.30
70	76	0.35
80	90	0.40
100	101.60	0.50
n.b The tolerance on outside diameter includes ovality

Wall Thickness

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

a) thickness less 1.5mm: +/- 0.15mm

b) thickness 1.5mm and over: +/- 10% or +/- 0.35mm whichever is the smaller

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	2.50	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	1.22	1.50	1.63	2.03
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 could be spray weld repaired after the removal of the external fin subject to size feasibility, this requirement must be specified at time of enquiry.

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

Size Chart – Tunnel

	Wall	1.50	2.00
35.00 x 30.00	–	x	x
60.00 x 25.00	–	x	x
60.00 x 30.00	–	x	x