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Welded carbon steel tubes for machine structural purposes

JIS No. G3445
Grade STKM11 , STKM12 , STKM13 , STKM14 , STKM18

Standard sizes and Unit weights

(Unit : kg/m)
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

(Unit : %)
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

(Unit : mm)
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

Meeting chair

Meeting Chair

Automobile seats
Automobile Seats

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