Application£º
Mainly used for manufacturing superheated pipelines,the steam pipe, boiling water tube, flue tube, small flue tube,etc.of low£¬mediam pressure boiler, locomotive boiler, the general industry boiler and the life boiler and so on
(working pressure is not more than 5.88Mpa generally, operating temperature below 450^o C) .
Dimension Tolerances£º

Pipe Types	Pipe S ize     mm		Tolerances Standard
Hot rolled	OD D	¡Ü159	¡À1.0%( Min¡À0.50mm)
		>159	¡À1.0%
	WT s	¡Ü20	+15% -12.5%(Min +0.45mm ¨C0.35mm)
		>20	¡À12.5%
Cold drawn	OD D	10~30	¡À0.40mm
		>30~50	¡À0.45mm
		>50	¡À1%
	WT s	<1.5~3.0	+15% -10%
		>3	+12.5% -10%

Mechanical Properties£º

Grade	WT mm	Tensile Strength ¦Äb Mpa	Yield Strength ¦Ò0.2, Mpa	Elongation ¦Ä5, %
			¡Ý
10	all	335~475	195		24
20	<15	410~550	245		20
	¡Ý15		225

Steel pipe yield strength minimum value under the high temperature£º

Grade	Test specimen condition	TemperatureoC
		200	250	300	350	400	450
10	?Goods supply condition	165	145	122	111	109	107
20		188	170	149	137	134	132

Chemical composition£º

standard	grade	Chemical composition
		C	Si	Mn	P	S	Cr	Mo	Cu	Ni	V
GB3087	10	0.07¡«0.14	0.17¡«0.37	0.35¡«0.65	¡Ü0.035	¡Ü0.035	¡Ü0.15	/	¡Ü0.25	¡Ü0.25	/
	20	0.17¡«0.24	0.17¡«0.37	0.35¡«0.65	¡Ü0.035	¡Ü0.035	¡Ü0.25	/	¡Ü0.25	¡Ü0.25	/

Products can be also supplied according to the standard of ASTM A179, ASTM A192, ASTM A106, ASME SA179, SA192£¬ ISO 9329-1,  DIN 17175,  JIS G 345,  BS 3059.