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Steel Tubes for Automotive Purpose

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





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