Steel Tubes for Automotive Purpose
IS 3074 — Steel Tubes for Automotive Purpose
IS 3074 specifies requirements for electric resistance welded (ERW) and cold drawn electric welded (CEW) steel tubes used in automotive applications, conforming to IS:3074 – 1979.
| Specification | 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 |
Tolerance ± 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 | Tolerance on Mean Thickness ± mm |
||||||||||||||
| Over mm |
U.T.I. mm |
Tolerance ± mm |
Over mm |
U.T.I. mm |
||||||||||||
| CEW–1 (annealed) |
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 (annealed) |
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 | ||||||||||||||||
Supply
Available in ERW and CEW grades as per IS:3074 – 1979. Custom sizes and lengths supplied on request.