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 |
| |
|
