JIS G3445
Application:
It is used for machinery, automobile, bicycle, furniture and components for other machines.
Main Steel Tube Grades:
STKM11A, STKM12A, STKM12B, STKM12C, STKM13A, STKM13B, STKM13C, STKM14A, STKM14B, STKM14C
Chemical Composition:
|
Standard |
Steel Grade |
Chemical Composition, % |
||||
|
C |
Si |
Mn |
P |
S |
||
|
JIS G3445 |
STKM 11A |
≤ 0.12 |
≤ 0.35 |
≤ 0.60 |
≤ 0.040 |
≤ 0.040 |
|
STKM 12A |
≤ 0.20 |
≤ 0.35 |
≤ 0.60 |
≤ 0.040 |
≤ 0.040 |
|
|
STKM 12B |
||||||
|
STKM 12C |
||||||
|
STKM 13A |
≤ 0.25 |
≤ 0.35 |
0.30-0.90 |
≤ 0.040 |
≤ 0.040 |
|
|
STKM 13B |
||||||
|
STKM 13C |
||||||
|
STKM 14A |
≤ 0.30 |
≤ 0.35 |
0.30-1.00 |
≤ 0.040 |
≤ 0.040 |
|
|
STKM 14B |
||||||
|
STKM 14C |
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Mechanical properties:
|
Standard |
Steel Grade |
Mechanical properties |
||
|
Ts (Mpa) |
Ys (Mpa) |
E (%) |
||
|
JIS G3445 |
STKM 11A |
≥ 295 |
/ |
≥ 35 |
|
STKM 12A |
≥ 345 |
≥ 175 |
≥ 35 |
|
|
STKM 12B |
≥ 390 |
≥ 275 |
≥ 25 |
|
|
STKM 12C |
≥ 470 |
≥ 355 |
≥ 20 |
|
|
STKM 13A |
≥ 375 |
≥ 215 |
≥ 30 |
|
|
STKM 13B |
≥ 440 |
≥ 305 |
≥ 20 |
|
|
STKM 13C |
≥ 510 |
≥ 380 |
≥ 15 |
|
|
STKM 14A |
≥ 410 |
≥ 245 |
≥ 25 |
|
|
STKM 14B |
≥ 500 |
≥ 355 |
≥ 15 |
|
|
STKM 14C |
≥ 550 |
≥ 410 |
≥ 15 |
|