Welded carbon steel tubes for general structural purposes

Standard sizes and Unit weights

O.D＼W.t (mm)	1.6	1.9	2.0	2.3	2.4	2.8	3.2	3.5	3.8
21.7	0.793	0.928	0.972	1.10		1.31
27.2	1.01	1.19	1.24	1.41		1.68
34.0	1.28	1.50		1.80	1.87	2.15	2.43
41.0				2.19	2.28	2.64	2.98
41.9				2.25	2.34	2.70	3.05
42.7		1.19		2.29	2.39	2.76	3.12	3.38
48.6		2.19		2.63	2.73	3.16	3.58	3.89
50.8	1.94			2.75		3.31	3.76	4.08
60.5				3.30		3.98	4.52	4.92	5.31
76.3				4.20		5.08	5.77	6.28	6.79

Chemical components

Grade	C max	Si max	Mn max			P max	S max
STK290	-	-	-			0.050	0.050
STK400	0.25	-	-			0.040	0.040
STK500	0.24	0.35	0.30～1.30			0.040	0.040
STK490	0.18	0.55	1.50			0.040	0.040
STK540	0.23	0.55	1.50			0.040	0.040

Mechanical properties

Mechanical properties	Tension test					Bending test		Flatting test
	Tensile strength, min N/mm2	Yielding point or proof stress, min N/mm2	Elongation %			Bending		Flatting
			No.11 No.12			Bending angle	Inner radius (D is the nominal tube diameter)	The minimum flattened height(H) (D is the nominal tube diameter)
			Longitudinal direction min
Outside diameter(mm)	All size	All size	40<O.D			O.D ≤50		All size(1)
STK290	290	-	30			90ﾟ	6D	2/3D
STK400	400	235	23			90ﾟ	6D	2/3D
STK500	500	355	15			90ﾟ	8D	7/8D
STK490	490	315	23			90ﾟ	6D	7/8D
STK540	540	390	20			90ﾟ	6D	7/8D

Dimensional Tolerance

Outside diameter		Wall thickness		Length
Outside diameter	Tolerance	Wall thickness	Tolerance	Tolerance
O.D<50 O.D≥50	±0.25 ±0.5%	W.t<3 W.t≥3	±0.3 ±10%	+50 0

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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