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STEEL TUBES FOR AUTOMOTIVE PURPOSE (Extracts from IS: 3074) back
 
Specifi-
cation
Grade Rm kgf/mm2 N/mm2 Re kgf/mm2 N/mm2
Min.
Flattening Test Drift Expansion on D% Chemical Composition Tolerances
C% Mn% C% Mn% Mean Outside Diameter Tole–
rance ± mm
Thickness
Min. Max. Min. Max.
Over mm U.T.I. mm
IS:3074 – 1979 ERW–1 32
310
17
160
3t 12 ½ 0.20 0.30 0.60 25 0.10 ±8%^ (excluding the weld).  The height of the internal fin shall not be greater than 60% of the specified wall thickness.
ERW–2 39
380
25
240
5t 10 0.20 0.30 0.30 0.60 25
51
51
63
0.13
0.15
ERW–3 44
430
28
270
8t 7 ½ 0.40 0.30 0.60 63
76
76
88
0.20
0.25
Crushing Test % mm Tolerance
Mean Outside
Inside Diameter
Thickness Tole–rance on mean thick–ness ± mm
Over
mm
U.T.I.
mm
Tole–rance ± mm Over
mm
U.T.I.
mm
CEW–1 (anne–aled) 32
310
17
160
50 0.20 0.30 0.60 38 0.10 2 0.08
CEW–1 (As drawn) 44
430
38
370
25 0.20 0.30 0.60 38 51 0.31
CEW–2 (anne–aled) 44
430
28
270
50 0.20 0.30 0.30 0.60 51 64 0.16
CEW–2 (As drawn) 56
550
46
450
25 0.20 0.30 0.30 0.60 64 77 0.19 2 5 0.10
 
Rm: Tensile strength, Re: Yield stress, D: Outside diameter, t: Wall thickness
 
 
 
 
 
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