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.