IS 3074 erw 1 and HFIW Steel Tubes manufacturer India

IS 3074 ERW (Electric Resistance Welded) and HFIW (High Frequency Induction Welded Steel Tubes) manufacturer in India

Specifi cation	Grade	Rm kgf/mm2 N/mm2		Re kgf/mm2 N/mm2 Min.	Flattening Test	Drift Expansion on D%	Chemical Composition				Tolerances
		C%	Mn%				C%		Mn%		Mean Outside Diameter		Tole– rance ± mm	Thickness
							Min.	Max.	Min.	Max.	Mean Outside Diameter
							Min.	Max.	Min.	Max.	Over mm	U.T.I. mm
IS:3074 – 1979	ERW–1	32 310		17 160	3t	12 ½	–	0.20	0.30	0.60	–	25	0.10	±8%^ (excluding the weld). The height of the internal fin shall not be greater than 60% of the specified wall thickness.
	ERW–2	39 380		25 240	5t	10	0.20	0.30	0.30	0.60	25 51	51 63	0.13 0.15
	ERW–3	44 430		28 270	8t	7 ½	–	0.40	0.30	0.60	63 76	76 88	0.20 0.25
Crushing Test % mm											Tolerance
											Mean Outside Inside Diameter			Thickness		Tole–rance on mean thick–ness ± mm
											Over mm	U.T.I. mm	Tole–rance ± mm	Over mm	U.T.I. mm	Tole–rance on mean thick–ness ± mm
	CEW–1 (anne–aled)	32 310	–	17 160	50		–	0.20	0.30	0.60	–	38	0.10	–	2	0.08
	CEW–1 (As drawn)	44 430	–	38 370	25		–	0.20	0.30	0.60	38	51	0.31
	CEW–2 (anne–aled)	44 430	–	28 270	50		0.20	0.30	0.30	0.60	51	64	0.16
	CEW–2 (As drawn)	56 550	–	46 450	25		0.20	0.30	0.30	0.60	64	77	0.19	2	5	0.10
Rm: Tensile strength, Re: Yield stress, D: Outside diameter, t: Wall thickness