JIS G3106-2008 Rolled Steels for Welded Structure Mechanical Properties
Tensile Test Impact Test
Carbon Equivalent
%
Sensitivity of
welding crack %
Chemical Compositions %
Yield Point N/mm² Elongation Thickness (mm)
Thickness (mm) Thickness (mm) Grade Thickness(mm)
C (max)
Si (max) Mn P
(max)S
(max) t 16≦16＜t
40≦
40＜t75≦
75＜t90≦
Tensile Strength N/mm²
Thickness(mm)
Test Piece
% (min)
TestTemp(℃)
CharpyAbsorbedEnergyAverage(Joule)
Test piece t 50≦50＜t≦80 t 50≦ 50＜
t≦80
t 50≦ 0.23 SM400A
50＜t 90≦ 0.25 － 2.5×C
min ─ ─
SM400B t 50≦ 0.20 0.35 0.60~ 1.50
0 27 min
SM400C t 50≦ 0.18 0.35 0.60~ 1.50
0.035 0.035 245 min
235 min
215 min
215 min 400~510
6 t 16≦ ≦16＜t 50≦
40＜t
No.1A No.1A No.4
18 22 24
0 47 min
t 50≦ 0.20 SM490A
50＜t 90≦ 0.22 0.55 1.65
max ─ ─
t 50≦ 0.18 SM490B
50＜t 65≦ 0.20 0.55 1.65
max 0 27 min
SM490C t 50≦ 0.18 0.55 1.65 max
0.035 0.035 325 min
315 min
295 min
295 min 490~610
6 t 16≦ ≦16＜t 50≦
40＜t
No.1A No.1A No.4
17 21 23
0 47 min
SM490YA ─ ─
SM490YB t 50≦ 0.20 0.55 1.65
max 0.035 0.035 365 min
355 min
335 min
325 min 490~610
6 t 16≦ ≦16＜t 50≦
40＜t
No.1A No.1A No.4
15 19 21 0 27 min
SM520B 0 27 min
SM520C t 50≦ 0.20 0.55 1.65
max 0.035 0.035 365 min
355 min
335 min
325 min 520~640
6 t 16≦ ≦16＜t 50≦
40＜t
No.1A No.1A No.4
15 19 21 0 47 min
－ － － －
SM570 t 80≦ 0.18 0.55 1.70 max 0.035 0.035 460
min 450 min
430 min
420 min 570~720
6 t 16≦ ≦16＜t 20＜t
No.5 No.5 No.4
19 26 20
-5 47 min
V-notch test piece in rolling direction
0.44 max
0.47 max
0.28 max
0.30 max
Remarks:1. Alloy elements other than those shown in the above table may be added necessary. 2. Impact test is applicable to thickness over 12.0mm of steel. 3. SM570 is produced by Thermo-Mechanical Controlled Process(TMC). 4. Carbon Equivalent＝C＋Mn/6＋Si/24＋Ni/40＋Cr/5＋Mo/4＋V/14. 5. Sensitivity of welding crack＝C＋Si/30＋Mn/20＋Cu/20＋Ni/60＋Cr/20＋Mo/15＋V/10＋5B. 6. Grade SM400A through Grade SM520C may be subjected to normalizing by agreement between purchaser and manufacturer.
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