| 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
|
|
|
|
