R&D

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	C	Si	Mn	P	S
JIS G3445	STKM 11A	≤ 0.12	≤ 0.35	≤ 0.60	≤ 0.040	≤ 0.040
JIS G3445	STKM 12A	≤ 0.20	≤ 0.35	≤ 0.60	≤ 0.040	≤ 0.040
JIS G3445	STKM 12B	≤ 0.20	≤ 0.35	≤ 0.60	≤ 0.040	≤ 0.040
JIS G3445	STKM 12C	≤ 0.20	≤ 0.35	≤ 0.60	≤ 0.040	≤ 0.040
JIS G3445	STKM 13A	≤ 0.25	≤ 0.35	0.30-0.90	≤ 0.040	≤ 0.040
JIS G3445	STKM 13B	≤ 0.25	≤ 0.35	0.30-0.90	≤ 0.040	≤ 0.040
JIS G3445	STKM 13C	≤ 0.25	≤ 0.35	0.30-0.90	≤ 0.040	≤ 0.040
JIS G3445	STKM 14A	≤ 0.30	≤ 0.35	0.30-1.00	≤ 0.040	≤ 0.040
JIS G3445	STKM 14B	≤ 0.30	≤ 0.35	0.30-1.00	≤ 0.040	≤ 0.040
JIS G3445	STKM 14C	≤ 0.30	≤ 0.35	0.30-1.00	≤ 0.040	≤ 0.040

Mechanical properties:

Standard	Steel Grade	Ts (Mpa)	Ys (Mpa)	E  (%)
JIS G3445	STKM 11A	≥ 295	/	≥ 35
JIS G3445	STKM 12A	≥ 345	≥ 175	≥ 35
JIS G3445	STKM 12B	≥ 390	≥ 275	≥ 25
JIS G3445	STKM 12C	≥ 470	≥ 355	≥ 20
JIS G3445	STKM 13A	≥ 375	≥ 215	≥ 30
JIS G3445	STKM 13B	≥ 440	≥ 305	≥ 20
JIS G3445	STKM 13C	≥ 510	≥ 380	≥ 15
JIS G3445	STKM 14A	≥ 410	≥ 245	≥ 25
JIS G3445	STKM 14B	≥ 500	≥ 355	≥ 15
JIS G3445	STKM 14C	≥ 550	≥ 410	≥ 15