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Steel Pipes Specifications » Steel Tubes for Structural Purposes

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Steel Tubes for Structural Purposes Conforming to IS: 1161 / 1998

Size N.B. mm & Series	Outside Diameter (mm)	Wall Thickness (mm)	Weight (kg/mtr.) Plain end	Mtr per Ton

15 L	21.30	2.00	0.947	1056
M		2.60	1.21	826
H		3.20	1.44	694

20 L	26.90	2.30	1.38	725
M		2.60	1.56	641
H		3.20	1.87	535

25 L	33.70	2.60	1.98	505
M		3.20	2.41	415
H		4.00	2.93	341

32 L	42.40	2.60	2.54	394
M		3.20	3.10	323
H		4.00	3.79	264

40 L	48.30	2.90	3.23	310
M		3.20	3.56	281
H		4.00	4.37	229

50 L	60.30	2.90	4.08	245
M		3.60	5.03	199
H		4.50	6.19	162

65 L	76.10	3.20	5.71	175
M		3.60	6.42	156
H		4.50	7.93	126

80 L	88.90	3.20	6.72	149
M		4.00	8.36	120
H		4.80	9.90	101

90 L	101.60	3.60	8.70	115
M		4.00	9.63	104
H		4.80	11.50	87

100 L	114.30	3.60	9.75	103
M		4.50	12.20	82
H		5.40	14.50	69

110 L	127.0	4.50	13.60	74
M		4.80	14.50	69
H		5.40	16.20	62

125 L	139.70	4.50	15.0	67
M		4.80	15.9	63
H		5.40	17.9	56

135 L	152.40	4.50	16.4	61
M		4.80	17.5	57
H		5.40	19.6	51

150 L	165.10	4.50	17.8	56
M		4.80	18.9	53
H		5.40	21.3	47

150 L	168.30	4.50	18.2	55
M		4.80	19.4	52
H1		5.40	21.7	46
H2		6.30	25.2	40

175 L	193.70	4.80	22.4	45
M		5.40	25.1	40
H		5.90	27.3	37

200 L	219.10	4.80	25.4	39
M		5.60	29.5	34
H		5.90	31.0	32

225 H	244.50	5.90	34.70	29

250 H	273.00	5.90	38.90	26

300 H	323.90	6.30	49.30	20

350 H	355.60	8.00	68.60	15

NOTE:

1 MPa = 1N/mm² = 0.102kgf/mm²
Elongation percent for tubes up to and including 25mm nominal bore for all grades shall be minimum.

TOLERANCES:
A. Outside Diameter:
i) Upto and including 48.3 mm	± 0.4 mm - 0.8 mm
ii) Over 48.3 mm	± 1.0%
B. Thickness (For All Size): Welded tubes + Not Ltd.	- 10%
C. Weight
Single tubes Light:	+ 10% - 8%
Med & Heavy 10 Tons Lot Light: Med & Heavy	± 10% ± 5% ± 7.5%

D. Physical Properties
Grade	Tensile Strength (Min).	Yield Stress (Min.)	Elongation on Gauge length 5.65 vS01 Min.
	MPa	MPa	Percent
YSt 210	330	210	20
Yst 240	410	240	17

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