Welded carbon steel square pipes for general structural purposes

Standard sizes and Unit weights

Side length＼W.t (mm)	1.6	2.3	3.2
40×40	1.88	2.62	3.58
50×50	2.38	3.34	4.50
60×60	2.88	4.06	5.50
60×30	2.13	2.98	3.99
75×45	2.88	4.06	5.50

Chemical components

Grade	C max	Si max	Mn max			P max	S max
STKR400	0.25	-	-			0.040	0.040
STKR490	0.18	0.55	1.50			0.040	0.040

Mechanical properties

Grade	Tensile strength, min N/mm2	Yielding point or proof stress, min N/mm2	Elongation %
			No.5, min
STKR400	400	245	23
STKR490	490	325	23

Dimensional Tolerance

Item		Tolerance
Side length		±1.5
Unevenness of flat surface on each side		0.5 or less
Squareness		±1.5ﾟ
Dimension of each section : s		3W.t or less
Length		+20 0
Straightness		3% or less of over all length
Wall thickness	W.t<3	±0.3
	W.t≥3	±10%
Flat surfaces are indicated by the shaded areas in the figure below. The straightness tolerance applies to major bends up and down and to the right and left. The thickness tolerance applies to flat surfaces.

Examples

• Welded carbon steel tubes for machine structural purposes
• Welded carbon steel tubes for general structural purposes
• Welded carbon steel square pipes for general structural purposes

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