| Steel Tubes for Automotive Purpose Confirming to IS 3074/1979 & IS 5429/1979 |
| Dimensions |
|
Outside Diameters × Thickness |
Outside Diameters × Thickness |
|
mm × mm |
mm × mm |
|
10.2 × 0.6 |
31.8 × 1.0 |
|
10.2 × 1.0 |
31.8 × 1.6 |
|
10.2 × 1.6 |
31.8 × 3.2 |
|
12.0 × 0.6 |
38.0 × 1.2 |
|
12.0 × 1.2 |
38.0 × 1.6 |
|
12.0 × 1.6 |
38.0 × 2.0 |
|
12.0 × 2.3 |
38.0 × 2.6 |
|
13.5 × 2.0 |
38.0 × 4.0 |
|
16.0 × 1.2 |
44.5 × 1.0 |
|
16.0 × 1.6 |
44.5 × 1.6 |
|
16.0 × 2.6 |
44.5 × 2.3 |
|
16.0 × 3.2 |
44.5 × 3.2 |
|
17.2 × 1.6 |
51.0 × 1.2 |
|
17.2 × 2.0 |
51.0 × 1.6 |
|
20.0 × 2.0 |
51.0 × 2.6 |
|
20.0 × 2.6 |
57.0 × 1.6 |
|
20.0 × 3.2 |
63.5 × 1.6 |
|
22.2 × 1.6 |
63.5 × 2.6 |
|
22.2 × 2.0 |
63.5 × 4.0 |
|
22.2 × 2.6 |
70.0 × 2.9 |
|
22.2 × 3.2 |
76.2 × 2.6 |
| 25.4 × 1.6 |
76.2 × 4.0 |
| 25.4 × 2.3 |
88.9 × 3.2 |
| 25.4 × 3.2 |
101.6 × 4.5 |
| 30.0 × 2.0 |
- |
| 30.0 × 3.2 |
- |
|
|
Mechanical Properties For Cold Drawn Electric Resistance Butt-Welded Steel Tubes |
|
Tube Designation |
Condition |
Tensile Strength, Mpa |
Yield Stress Mpa |
Crushing Test, Percentage |
|
|
|
Min |
Min |
Max |
|
CEW – 1 |
Annealed |
310 |
160 |
50 |
|
|
As drawn or as drawn and tempered |
430 |
370 |
25 |
|
|
If subsequently annealed, brazed or welded |
330 |
180 |
-- |
|
CEW – 2 |
Annealed |
430 |
270 |
50 |
|
|
As drawn or as drawn and tempered |
550 |
450 |
25 |
|
|
If subsequently annealed, brazed or welded |
430 |
270 |
-- | |
|
Chemical Composition For Cold Drawn Electric Resistance Butt-Welded Steel Tubes |
|
Tube Designation |
← Percentage → |
|
C
Max |
Mn |
S
Max |
P
Max |
|
CEW – 1 |
0.20 |
0.30-0.60 |
0.060 |
0.060 |
|
CEW – 2 |
0.20 – 0.30 |
0.30-0.60 |
0.060 |
0.060 | |
| Mechanical Properties For Electric Resistance Butt-Welded Steel Tubes |
|
Tube Designation |
Condition Tensile Strength |
Yield Stress |
Flattening Test |
Drifting Test |
|
|
Mpa |
Mpa |
t=thickness |
Percentage |
|
|
Min |
Min |
Max |
Min |
|
EREW – 1 |
310 |
160 |
3t |
12 ½ |
|
ERW – 2
If subsequently annealed, brazed,or welded |
380
330 |
240
180 |
5t
- |
10
- |
|
ERW - 3
If subsequently annealed, brazed,or welded |
430
380 |
270
240 |
80
- |
7 ½
- | |
| Chemical Composition for Electric Resistance Butt-Welded Steel Tubes (ERW) |
|
Tube Designation |
-Percentage- |
|
|
C |
Mn |
S |
P |
|
|
Max |
|
Max |
Max |
|
EREW – 1 |
0.20 |
0.30-0.60 |
0.060 |
0.060 |
|
ERW – 2
|
0.20-0.30 |
0.30-0.60 |
0.060 |
0.060 |
|
ERW - 3
|
0.40 |
0.30-0.60 |
0.060 |
0.060 |
Tolerances
A) FOR COLD DRAWN ELECTRIC RESISTANCE WELDED TUBES :
1) Thickness
a) Mean thickness
i) ± 0.8mm for tubes upto & including 2.0mm thick
ii) ± 0.1mm for tubes above 2.0mm thick upto & including 5.0mm thick
b) In any one tube – ± 10% of the actual mean thickness of the tube.
2) Mean inside diameter or outside diameter (whichever is specified)
a) ± 0.1mm for tubes upto & including 38.0mm diameter.
b) ± 0.1mm with the addition of ± 0.03mm for each 13mm or part thereof over 38.0mm diameter.
B) ELECTRIC RESISTANCE WELDED TUBES :
i) Thickness ± 8%
ii) Mean outside diameter :
|
Outside Diameter of tube |
Tolerances |
|
Over |
Upto & including |
± |
|
mm |
mm |
mm |
|
- |
25 |
0.10 |
|
25 |
51 |
0.13 |
|
51 |
63 |
0.18 |
|
63 |
76 |
0.20 |
|
76 |
88 |
0.25 |
|
88 |
- |
0.30 | |
|
|
