carbon seamless steel pipe, It's a long strip of steel. The steel pipe has a hollow section and is widely used for conveying fluid pipelines, such as conveying oil, natural gas, gas, water and some solid materials. Compared with solid steel such as round steel, steel pipe has the same bending and torsional strength and lighter weight. It is a kind of economic cross-section steel, widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipe, automobile drive shaft, bicycle frame and steel scaffolding used in construction. Making ring parts with steel pipe can improve material utilization rate, simplify manufacturing process, save material and processing time, such as rolling bearing ring, jack sleeve, etc., steel pipe has been widely used to manufacture. Steel pipe or all kinds of conventional weapons indispensable material, gun barrel, barrel and so on to make steel pipe. Steel pipe can be divided into round pipe and special-shaped pipe according to the shape of cross-sectional area. Since the volume of a circular surface is maximum with equal perimeters, more fluid can be transported with a circular tube. In addition, the annular section under internal or external radial pressure, the force is more uniform, so the vast majority of steel tubes are round. Manufacturing ring parts with steel pipe can improve material utilization rate, simplify manufacturing process, save material and processing time, such as rolling bearing ring, jack sleeve, etc., has been widely used to manufacture steel pipe.GB8163 "Seamless steel pipe for fluid Transportation", GB6479 "High pressure seamless steel pipe for fertilizer equipment", GB9948 "Seamless steel pipe for Petroleum Cracking", GB3087 "Seamless steel tubes for Low and medium pressure boilers", GB5310 "Seamless steel tube for high pressure boiler".(1) carbon seamless steel pipe,the importance of structure heavy industrial building structure, large span structure, high-rise or super high-rise civil building structure or structures and other important structures, should consider the use of good quality seamless steel pipe, for general industrial and civil building structure, according to the nature of the work, the use of ordinary quality seamless steel pipe. (2) carbon seamless steel pipe,The structure bearing dynamic load directly and the structure in strong earthquake area should choose seamless steel pipe with good comprehensive performance; Generally under static load structure can choose the lower price of seamless steel pipe. (3) carbon seamless steel pipe, Connection method The welding process will produce welding deformation, welding stress and other welding defects, which may lead to cracks or brittle fracture of the structure. Therefore, welding structure should be strict to material requirements. (4) carbon seamless steel pipe,The temperature and environment of the structure, seamless steel pipe is easy to be cold and brittle at low temperature, so the structure working at low temperature, especially the welding structure, should choose the killed steel with good low temperature brittle fracture resistance. In addition, the open air structure of Taiyuan seamless steel pipe is easy to produce aging, harmful medium effect of seamless steel pipe is easy to corrosion, fatigue and fracture, should also be different to choose different materials. (5) too seamless steel pipe thickness, thin seamless steel pipe rolling times, rolling compression ratio is large, large thickness of seamless steel pipe compression ratio is small, so the thickness of precision steel pipe is not only small strength, but also poor plasticity, impact toughness and welding performance. Therefore, the welded structure with large thickness should use better seamless steel pipe.

Executive Standard	Grade / Material	Product Name
ASTM A53	A, B	Black and Hot-Dipped Zinc-Coated Steel Pipes Welded and Seamless
ASTM A106	A, B	Seamless Carbon Steel for High Temperature Service
ASTM A179	Low Carbon Steel	Seamless Cold-Drawn Low-Carbon Steel Heat Exchanger and Condenser Tubes
ASTM A192	Low Carbon Steel	Seamless Carbon Steel Boiler Tubes for High Pressure
ASTM A210	A1, C	Seamless Medium-Carbon and Alloy Steel Boiler and Super heater Tubes
ASTM A213	T5, T11, T12, T22 TP 347H	Seamless Ferritic and Austenitic Alloy Steel Boiler, Superheater and Heat- Exchanger Tubes
ASTM A312	TP304/304L, TP316/316L	Seamless Steel Pipe for Stainless Materials
ASTM A333	Gr.6	Seamless and Welded Steel Pipe for Low-Temperature Service
ASTM A335	P9, P11, P22	Seamless Ferritic Alloy Steel Pipe for High-Temperature Service
ASTM A519	4130,4140	Seamless Carbon and Alloy Steel for Mechanical Tubing
ASTM A789		Seamless Ferritic/Austenitic Stainless Steel Tubing for General Service

Executive Standard	Grade / Material	Product Name
API Spec 5CT	J55, K55, N80, L80,C90, C95, T95, P110, M65	Specification for Casing and Tubing
API Spec 5L PSL1 / PSL2	A,B X42, X46, X52, X56, X60, X65,. X70	Specification for Line Pipe

Executive Standard	Grade / Material	Product Name
DN 17175/EN10216-2	ST35, ST45, ST52, 13CrMo44	Seamless Steel Tube for Elevated Temperature
DIN 2391/EN10305-1	St35, St45, St52	Cold Drawn Seamless Precision Pipe
DIN 1629/EN10216-1	St37, St45, St52	Seamless Circular unalloyed Steel Tubes Subject to Special Requirements

Product	Seamless Steel Pipe For Exploration & Production
OD	13.72 mm - 914.4 mm
WT	1.65 mm - 22 mm
Length	0.5 m - 20 m
Standard	API 5L PSL1 /PSL2
Material	GR.B/X42/46/X52/56/X60/65/X70/80
Usage	Chilled Water Pipe, Drinking water Pipe, W aste Water Pipe, Structural Tube, Fluid Pipe, Boiler Pipe, Oil and Gas Transportation Pipe, Mechanical Structure Pipe

Product	Seamless Steel Pipe For Exploration & Production
OD	13.72 mm - 914.4 mm
WT	1.65 mm - 22 mm
Length	0.5 m - 20 m
Standard	API 5L PSL1 /PSL2
Material	GR.B/X42/46/X52/56/X60/65/X70/80
Usage	Chilled Water Pipe, Drinking water Pipe, W aste Water Pipe, Structural Tube, Fluid Pipe, Boiler Pipe, Oil and Gas Transportation Pipe, Mechanical Structure Pipe

API 5L PSL1
Standard	Grade	Chemical Components				Tensile STrength(min)	Yield Strength(min)
		C	Mn	P	S	Mpa	Mpa
API 5L	A	0.22	0.90	0.030	0.030	331	207
PSL1	B	0.28	1.20	0.030	0.030	414	241
	X42	0.28	1.30	0.030	0.030	414	290
	X46	0.28	1.40	0.030	0.030	434	317
	X52	0.28	1.40	0.030	0.030	455	359
	X56	0.28	1.40	0.030	0.030	490	386
	X60	0.28	1.40	0.030	0.030	517	414
	X65	0.28	1.40	0.030	0.030	531	448
	X70	0.28	1.40	0.030	0.030	565	483
API 5L PSL2
Standard	Grade	Chemical Components				Tensile STrength(min)	Yield Strength(min)
		C	Mn	P	S	Mpa	Mpa
API 5L	B	0.24	1.20	0.025	0.015	414	241
PSL2	X42	0.24	1.30	0.025	0.015	414	290
	X46	0.24	1.40	0.025	0.015	434	317
	X52	0.24	1.40	0.025	0.015	455	359
	X56	0.24	1.40	0.025	0.015	490	386
	X60	0.24	1.40	0.025	0.015	517	414
	X65	0.24	1.40	0.025	0.015	531	448
	X70	0.24	1.40	0.025	0.015	565	483
	X80	0.24	1.40	0.025	0.015	621	552

STANDARDS	PRODUCTS	RANGES
IS:1239 (Part-I)	Mild Steel Tubes, Tubular	15mm NB - 150mm NB
IS:1161	Mild Steel Tubes for Structural purpose	15mm NB - 200mm NB
IS:3601	Mild Steel tubes for Mechanical & General Eng. purpose	20mm x 0.80mm to 165.10 x 7.00 mm
IS:3589	ERW Pipes for water Gas & Sewage	168.3 x 4.00 mm to 219.1 x 7.00mm
IS:9295	Steel Tubes for Idlers for Belt conveyors	63.5 x 4.00 mm to 219.1 x 7.0 mm
IS:4270	Steel Tubes for Water Wells	114.3 x 5.00mm to 219.1mm x 7.1mm
IS:7138	Steel Tubes for furniture	20.0 x .60mm to 60.0 x 2.0mm
IS:4923	Hollow Steel sections for structural purpose	12.5 x 12.5 x 0.80 to 150 x 150 x 6.0mm 10 x 20 x 0.80mm to 150 x 200 x 6.0mm
IS:3074	Steel Tubes for Automobile purpose	19.7 x 1.00mm to 101.6 x 6.0mm
BS:1387	Screwed & Socket Steel Tubes & Tubular	½"NB to 6″NB 2.00 mm - 5.40 mm wall thick
BS:3601	Steel Pipes & Tubes for pressure purpose	½"NB to 6″NB 2.00 mm - 7.00 mm wall thickness
BS:6323	Steel tubes for mechanical & general engineering purposes	21.3″ to 219.1mm OD wall thickness-1.60-7.00 mm