Closed Hollow Structures

Specifi-
cationGradeRm kgf/mm2 N/mm2Re kgf/mm2 N/mm2
Min.Flattening TestDrift Expansion on DChemical CompositionTolerances
C%Mn%C%Mn%Mean Outside DiameterTole-
rance ± mmThickness
Min.Max.Min.Max.
Over mmU.T.I. mm
IS:3074 - 1979ERW-132
31017
1603t12 ½-0.200.300.60-250.10±8%^ (excluding the weld). The height of the internal fin shall not be greater than 60% of the specified wall thickness.
ERW-239
38025
2405t100.200.300.300.6025
5151
630.13
0.15
ERW-344
43028
2708t7 ½-0.400.300.6063
7676
880.20
0.25
Crushing Test % mmTolerance
Mean Outside
Inside DiameterThicknessTole-rance on mean thick-ness ± mm
Over
mmU.T.I.
mmTole-rance ± mmOver
mmU.T.I.
mm
CEW-1 (anne-aled)32
310-17
16050-0.200.300.60-380.10-20.08
CEW-1 (As drawn)44
430-38
37025-0.200.300.6038510.31
CEW-2 (anne-aled)44
430-28
270500.200.300.300.6051640.16
CEW-2 (As drawn)56
550-46
450250.200.300.300.6064770.19250.10
Rm: Tensile strength, Re: Yield stress, D: Outside diameter, t: Wall thickness