Product Details

Tube STB340 Seamless in small calibers for high(low and medium) Pressure boilers

Main Steel Pipe Model

10/STB340/ST45.8/Ⅲ etc.

Standard Size

GB3087 ,GB5310,ASME SA210 ,DIN17175 ,JIS G3461

Diamensional tolerances:

Types of steel tubes	Outer diameters		Wall thickness
Cold-rolled tubes	Tube sizes(mm)	Tolerances(mm)	Tube sizes (mm)	Tolerances(mm)
Cold-rolled tubes	>30~50	±0.3	>3~20	±10%

Application

Used as the pipes on the heated side of low and medium pressure boilers(normally with operating pressure not higher than 5.88Mpa and operating temperature below 450 ^oC), as the pipes on the heated sides of high·pressure boilers, economizers, overheaters, reheaters and pipes for petrochemical industry(with the operating pressure above 9.8Mpa and operating temperature ranging between 450-650C1

Mechanical properties:

Standard codes	steel	Tensite strength(MPa)	Yield strength(MPa)	Elongation(%)	Hardness
GB3087	10	335~475	≥195	≥24	/
GB3087	20	410~550	≥245	≥20	/
GB5310	20G	410~550	≥245	≥24	/
	20MnG	≥415	≥240	≥22	/
	25MnG	≥485	≥275	≥20	/
ASME SA210	SA210A-1	≥415	≥255	≥30	≤143HB
ASME SA210	SA210C	≥485	≥275	≥30	≤179HB
DIN17175	ST45.8/Ⅲ	410~530	≥255	≥21	/
DIN17175	15Mo3	450~600	≥270	≥22	/

Chemical composition:

Standard codes	steel	Chemical compositions (%)
Standard codes	steel	C	Si	Mn	P	S	Cr	Mo
GB3087	10	0.07~0.13	0.17~0.37	0.38~0.65	≤0.030	≤0.030
GB3087	20	0.07~0.13		0.38~0.65				/
GB5310	20G	0.17~0.24		0.35~0.65
	20MnG	0.17~0.24		0.70~1.00
	25MnG	0.18~0.24		0.80~1.10
	15CrMo	0.12~0.18		0.40~0.70			0.80~1.10	0.40~0.55
ASME SA210	SA210A-1	0.13~0.19	≥0.1	0.45~0.65	≤0.030	≤0.030
ASME SA210	SA210C	0.18~0.24	≥0.1	0.80~1.10	≤0.030	≤0.030
DIN 17175	ST45.8/Ⅲ	≤0.21	0.10~0.35	0.40~1.20	≤0.040	≤0.040
DIN 17175	15Mo3	0.12~0.20	0.10~0.35	0.40~0.80	≤0.035	≤0.035		0.25~0.35

Manufacturer	Hebei Province Gold Mysterious Pipe Co.,Ltd
Process	Seamless, Cold drawn
size	Outer Diameter	25.8,31.8,38,50.8mmetv
	Wall Thickness	1.6-3.5mm
	Length	max 12m
Contact	Elina Wong 86-0312-6721288 skype.....>jinaoguanye3

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