JIS3445 Standard

Keywords:JIS3445 Standard
Standard:JIS3445
Usages:Suitable for carbon steel pipe used in machinery, automobile, bicycle, apparatus and other mechanical parts.
Steel Grades:STKM11A、STKM12(A,B,C)、STKM13(A,B,C)、STKM14(A,B,C)

Chemical composition of different steel grades:

Standard Steel Grades Chemical composition(%)
C Si Mn P S
JIS G3445 STKM11A
≤0.12
≤0.35
≤0.60
≤0.040
≤0.040
STKM12A 
≤0.20
0.35
0.60
≤0.040
≤0.040
STKM12B
STKM12C 
STKM13A
≤0.25
0.35
0.30-0.90 ≤0.040
≤0.040
STKM13B
STKM13C
STKM14A
≤0.30
0.35
0.30-1.00 ≤0.040
≤0.040
STKM14B
STKM14C

Mechanical properties of different steel grades:

Standard Steel grades Mechanical properties
Tensile strength(Mpa)
Yield strength(Mpa)
Elongation(%)
JIS G3445
STKM11A
≥295
/ ≥35
STKM12A
≥345
≥175
≥35
STKM12B
≥390
≥275
≥25
STKM12C
≥470
≥355
≥20
STKM13A
≥375
≥215
≥30
STKM13B
≥440
≥345
≥20
STKM13C
≥510
≥380
≥15
STKM14A
≥410
≥245
≥25
STKM14B
≥500
≥355
≥15
STKM14C
≥550
≥410
≥15

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