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Welded carbon steel tubes for general structural purposes

JIS No. G3444
Grade STK290 , STK400 , STK500 , STK490 , STK540

Standard sizes and Unit weights

(Unit : kg/m)
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

(Unit : %)
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

(Unit : mm)
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

Fence
Fence
Scaffolding
Scaffolding

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