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＜t 75 ≦ 75＜t 90 ≦ Tensile Strength N/mm² Thickness (mm) Test Piece % (min) Test Temp (℃) Charpy Absorbed Energy Average (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.

JIS G3016-2008

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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.