Nezone Tubes :::Steel Tubes for Autorickshaws and Bicycles

Steel Tubes for Autorickshaws and Bicycles Purpose Confirming to IS 2039/1991

1) Dimensions

Outside Diameter – 6.35mm o 44.5mm. Thickness 0.7mm to 3.25mm.

The sizes other than those specified may be supplied against specific requirement.

2) Fin Height

The external weld will be, flush with the outside surface of the tube. The internal fin height will not exceed 60% of wall thickness.

3) Straightness

Upto 1 Mtr. Cut Length 1/600th of the length.

More than 1 Mtr. Length 1/250th of the Length.

4) Chemical Properties

Tube Designation	C % Max	Si % Max	Mn % Max	P % Max	S % Max
ERW C1	0.15	0.15	0.60	0.06	0.06
ERW C2	0.20	0.15	0.90	0.05	0.05
ERW C3	0.25	0.35	1.20	0.05	0.05

5) Mechanical Properties for Electric Resistance Welded Tubes (ERW)

Tube Designation	As Welded			Annealed or Normalized
Tube Designation	YS MPa Min	UTS MPa Min	Elongation Percent, Min	YS MPa Min	UTS MPa Min	Elongation Percent, Min
ERW C1	200	300	10	170	270	27
ERW C2	300	400	8	220	360	25
ERW C3	350	430	8	260	380	23

Tolerances

i) Outside Diameter

Outside Diameter		For ERW Tubes			For CEW Tubes
Over	Upto & including	For ERW Tubes			For CEW Tubes
		As welded D/t < 40 & Annealed/ Normalised D/t < 20	Annealed/ Normalised Condition 20 D/t 20	All Condition D/t > 40	As drawn D/t < 10 as Annealed /Normalised D/t < 20 condition	Normailsed Condition 20 < D/t < 40
mm	mm	mm	mm	mm	mm	mm
-	30	+ 0.03 - 0.13	+ 0.06 - 0.15	+ 0.08 - 0.18	+ 0.03 - 0.13	+ 0.05 - 0.15
30	44.5	+ 0.06 - 0.14	+ 0.07 - 0.16	+ 0.10 - 0.20	+ 0.05 - 0.15	+ 0.08 - 0.18

ii) Length

a) Random length 4 to 7 mtr. - 0 + 100mm
b) Cut length

iii) Thickness -

1. For ERW Tubes ± 8 %
2. For CEW Tubes

A) Mean Thickness -
a) ± 0.1mm for tubes upto & including 2.0mm thick.
b) ± 0.15mm for tubes over 2mm thick.

B) At any point ±7.5 % of thickness.

Outside Diameter		Tolerances
Over	Upto & including
mm	mm	mm	mm
	500	-0 +1	-0 +2
500	2000	-0 +1.5	-0 +3
2000	5000	-0 +3	-0 +3
5000	7000	-0 +5	-0 +5

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