Welded carbon steel tubes for machine structural purposes

Standard sizes and Unit weights

O.D＼W.t (mm)	0.8	1.0	1.2	1.4	1.6	1.9	2.0	2.3	2.8	3.2
7.0	0.122	0.148
8.0	0.142	0.173
9.0	0.162	0.197
9.5	0.172	0.210
10.0	0.181	0.222	0.260		0.331
12.0	0.221	0.271	0.320		0.410
12.7	0.235	0.289	0.340	0.390	0.438
13.8			0.373	0.428	0.481		0.582	0.652
14.0	0.260	0.321	0.379	0.435	0.489
15.9	0.298	0.367	0.435	0.501	0.564		0.686	0.771
17.3			0.476	0.549	0.619		0.755	0.851
19.1	0.361	0.446	0.530	0.611	0.690		0.843	0.953
21.7			0.607	0.701	0.793	0.928	0.972	1.10	1.31
22.2		0.523	0.621	0.718	0.813		0.996	1.13
25.4		0.602	0.716	0.829	0.939		1.15	1.31		1.75
27.2			0.769	0.891	1.01	1.19	1.24	1.41	1.68
28.6		0.681	0.811	0.939	1.07		1.31	1.49
29.5		0.703	0.837	0.970	1.10		1.36	1.54
31.8		0.760	0.906	1.05	1.19		1.47	1.67	2.00
34.0			0.971	1.13	1.28		1.58	1.80	2.15	2.43
35.0			1.00	1.16	1.32		1.63	1.85
38.1			1.09	1.27	1.44		1.78	2.03
42.7			1.23	1.43	1.62		2.01	2.29

Chemical components

Grade	C max	Si max	Mn max	P max	S max
STKM11 A	0.12	0.35	0.60	0.040	0.040
STKM12 A	0.20	0.35	0.60	0.040	0.040
STKM12 B
STKM12 C
STKM13 A	0.25	0.35	0.30～ 0.90	0.040	0.040
STKM13 B
STKM13 C
STKM14 A	0.30	0.35	0.30～ 1.00	0.040	0.040
STKM14 B
STKM14 C
STKM18 A	0.18	0.55	1.50	0.040	0.040
STKM18 B
STKM18 C

Mechanical properties

Grade	Tension test			Flatting test	Bending test
	Tensile strength, min N/mm2	Yielding point or proof stress, min N/mm2	Elongation %	Flatting	Bending
			No.11 No.12 Longitudinal direction min	The minimum flattened height (H) (D is the nominal tube diameter)	Bending angle	Inner radius (D is the nominal tube diameter)
STKM11 A	290	-	35	1/2D	180°	4D
STKM12 A	340	175	35	2/3D	90°	6D
STKM12 B	390	275	25	2/3D	90°	6D
STKM12 C	470	355	20	-	90°	-
STKM13 A	370	315	30	2/3D	90°	6D
STKM13 B	440	305	20	3/4D	90°	6D
STKM13 C	510	380	15	-	90°	-
STKM14 A	410	245	25	3/4D	90°	6D
STKM14 B	500	355	15	7/8D	90°	8D
STKM14 C	550	410	15	-	90°	-
STKM18 A	440	275	25	7/8D	90°	6D
STKM18 B	490	315	23	7/8D	90°	8D
STKM18 C	510	380	15	-	90°	-

Dimensional Tolerance

Outside diameter		Wall thickness		Length
Outside diameter	Tolerance	Wall thickness	Tolerance	Tolerance
O.D<25	±0.12	W.T<2	±0.15	+50 0
25≤O.D<40	±0.15
40≤O.D<50	±0.18	W.T≥2	±8%
50≤O.D<60	±0.20

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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