R&D

Standard:

JIS G3461, JIS G3462

Application:

It is used for boiler and heat exchanger inside & outside tube

Main Steel Tube Grades:

STB340, STB410, STB510, STBA12, STBA13, STBA20, STBA22, STBA24

Chemical Composition:

Standard	Steel Grade	C	Si	Mn	P	S	Cr	Mo
JIS G3461	STB340	≤ 0.18	≤ 0.35	0.30-0.60	≤ 0.035	≤ 0.035	/	/
JIS G3461	STB410	≤ 0.32	≤ 0.35	0.30-0.80	≤ 0.035	≤ 0.035	/	/
JIS G3461	STB510	≤ 0.25	≤ 0.35	1.00-1.50	≤ 0.035	≤ 0.035	/	/
JIS G3462	STBA12	0.10-0.20	0.10-0.50	0.30-0.80	≤ 0.035	≤ 0.035	/	0.45-0.65
JIS G3462	STBA13	0.15-0.25	0.10-0.50	0.30-0.80	≤ 0.035	≤ 0.035	/	0.45-0.65
JIS G3462	STBA20	0.10-0.20	0.10-0.50	0.30-0.60	≤ 0.035	≤ 0.035	0.50-0.80	0.45-0.65
JIS G3462	STBA22	≤ 0.15	≤ 0.50	0.30-0.60	≤ 0.035	≤ 0.035	0.80-1.25	0.45-0.65
JIS G3462	STBA24	≤ 0.15	≤ 0.50	0.30-0.60	≤ 0.030	≤ 0.030	1.90-2.60	0.87-1.18

Mechanical Properties:

Standard	Steel Grade	TS (Mpa)	Ys (Mpa)	E (%)
JIS G3461	STB340	≥ 340	≥ 175	≥ 35
JIS G3461	STB410	≥ 410	≥ 255	≥ 25
JIS G3461	STB510	≥ 510	≥ 295	≥ 25
JIS G3462	STBA12	≥ 380	≥ 205	≥ 30
JIS G3462	STBA13	≥ 410	≥ 205	≥ 30
JIS G3462	STBA20	≥ 410	≥ 205	≥ 30
JIS G3462	STBA22	≥ 410	≥ 205	≥ 30
JIS G3462	STBA24	≥ 410	≥ 205	≥ 30