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High Quality Carbon Steel Seamless Pipe

Steel pipes have hollow sections that are much longer than the diameter or circumference of steel. According to the cross-sectional shape, it is divided into circular, square, rectangular and special-shaped steel pipes; according to the material, it is divided into carbon structural steel pipes, low-alloy structural steel pipes, alloy steel pipes and composite steel pipes; Steel pipes for thermal equipment, petrochemical industry, machinery manufacturing, geological drilling, high-pressure equipment, etc.;

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Product Description

Carbon steel pipes are made of steel ingots or solid round steel through perforation into capillary tubes, and then made by hot rolling, cold rolling or cold drawing.

According to the production process, carbon steel pipes can be divided into two categories: hot-rolled and cold-rolled (drawn) steel pipes.

Hot-rolled carbon steel pipes are divided into: general steel pipes, low and medium pressure boiler steel pipes, high pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes, geological steel pipes and other steel pipes.

Cold rolled carbon steel pipe:In addition to general steel pipes, low and medium pressure boiler steel pipes, high pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes, and other steel pipes, cold-rolled (dial) carbon steel pipes also include carbon thin-walled steel pipes, alloy thin-walled steel pipes, Rust thin-walled steel pipes, special-shaped steel pipes. The outer diameter of hot-rolled seamless pipe is generally greater than 32mm, and the wall thickness is 2.5-75mm. The outer diameter of cold-rolled seamless steel pipe can reach 6mm, and the wall thickness can reach 0.25mm. The outer diameter of thin-walled pipe can reach 5mm, and the wall thickness is less than 0.25mm. Cold rolling has higher dimensional accuracy than hot rolling.

General carbon steel pipe: It is made of high-quality carbon steel such as 10, 20, 30, 35, 45, 16Mn, 5MnV and other low-alloy structural steels or 40Cr, 30CrMnSi, 45Mn2, 40MnB and other alloy steels that are hot-rolled or cold-rolled. 10, 20 and other low carbon steel seamless pipes are mainly used for fluid conveying pipelines. Seamless tubes made of medium carbon steel such as 45 and 40Cr are used to manufacture mechanical parts, such as stressed parts of automobiles and tractors. Generally, carbon steel pipes are used to ensure strength and flattening tests. Hot-rolled steel pipes are delivered in a hot-rolled or heat-treated state; cold-rolled steel pipes are delivered in a heat-treated state.

According to different uses, it is divided into:

Name	Standard	Representing material (grade)	Application
General seamless carbon steel pipe		10, 20, 30, 35, 45 and other high-quality carbon steel, 16Mn, 5MnV and other low-alloy structural steel, 40Cr, 30CrMnSi, 45Mn2, 40MnB and other alloy steel	Seamless pipes made of low carbon steel such as 10 and 20 are mainly used for fluid transportation pipelines. 45, 40Cr and other medium carbon steel seamless pipes are used to manufacture mechanical parts, such as the stressed parts of automobiles and tractors.
Structural seamless steel pipes	GBT8162-2008	Carbon steel, 20, 45 steel; alloy steel Q345, 20Cr, 40Cr, 20CrMo, 30-35CrMo, 42CrMo, etc.	For general construction and mechanical construction.
Seamless steel pipes for conveying fluids	GBT8163-2008	20, Q345, etc.	It is used for conveying fluid pipelines in engineering and large-scale equipment.
Seamless steel pipes for low and medium pressure boilers	GB3087-2008	10, 20 steel	Hot-rolled and cold-drawn (cold-rolled) high-quality carbon structural steel used in the manufacture of superheated steam pipes, boiling water pipes, and superheated steam pipes, large smoke pipes, small smoke pipes and arch brick pipes for low and medium pressure boilers of various structures Seamless steel pipe.
Seamless steel pipe for high pressure boiler	GB5310-2008	20G、12Cr1MoVG、15CrMoG	High-quality carbon steel, alloy steel and stainless heat-resistant steel seamless steel pipes for the heating surface of water-tube boilers with high pressure and above.
Seamless steel pipe for high pressure fertilizer equipment	GB6479-2000	20、16Mn、12CrMo、12Cr2Mo, etc。	High-quality carbon structural steel and alloy steel seamless steel pipes for chemical equipment and pipelines with working temperature of -40~400℃ and working pressure of 10~30Ma.
Seamless steel pipe for oil cracking	GB9948-2006	High-quality carbon steel (10, 20), alloy steel (12CrMo, 15CrMo), heat-resistant steel (12Cr2Mo, 15Cr5Mo), etc.	Boilers, heat exchangers and their pipelines for conveying fluids in oil refineries.
Steel pipe for geological drilling	YB235-70	DZ40, DZ50, DZ60, R780, etc.	It is a steel pipe used by the geological department for core drilling. It can be divided into drill pipe, drill collar, core pipe, casing and sedimentation pipe according to the purpose.
Seamless steel pipe for diamond core drilling	GB3423-82	20# steel or 45# etc.	It is a seamless steel pipe for drill pipe, core rod and casing for diamond core drilling.
oil drilling pipe	YB528-65		It is used for seamless steel pipes with inner or outer thickening at both ends of oil drilling.
Carbon steel and carbon-manganese steel seamless pipes for ships	GB/5312-1999	360, 410, 460 steel grades, etc.	It is a carbon steel seamless steel pipe for the manufacture of Class I pressure-resistant piping systems, Class II pressure-resistant piping systems, boilers and superheaters.
Seamless steel pipe for automobile half shaft casing	GB3088-82		It is a high-quality carbon structural steel and alloy structural steel hot-rolled seamless steel pipe used in the manufacture of automobile axle casings and drive axle axle casings.
High pressure oil pipe for diesel engine	GB3093-86		It is a cold-drawn seamless steel pipe used in the manufacture of high-pressure pipes for diesel engine injection systems.
Precision inner diameter seamless steel pipes for hydraulic and pneumatic cylinders	GB8713-88		It is a cold-drawn or cold-rolled precision seamless steel pipe with precise inner diameter for the manufacture of hydraulic and pneumatic cylinders.
Cold drawn or cold rolled precision seamless steel pipe	GB3639-83		It is a cold-drawn or cold-rolled precision seamless steel pipe for mechanical structure and hydraulic equipment with high dimensional accuracy and good surface finish.
Shaped seamless steel pipe			It is a general term for seamless steel pipes with other cross-sectional shapes other than round pipes. According to the shape and size of the steel pipe section, it can be divided into equal-wall thickness special-shaped seamless steel pipe (code D), unequal wall thickness special-shaped seamless steel pipe (code BD), variable diameter special-shaped seamless steel pipe (code BJ). Shaped seamless steel pipes are widely used in various structural parts, tools and mechanical parts.
Seamless steel pipes for gas cylinders	GB18248-2000	37Mn, 34Mn2V, 35CrMo, etc.	It is used to make various gas and hydraulic cylinders.
In addition, there are GB/T17396-1998 (hot-rolled seamless steel pipe for hydraulic prop), GB3093-1986 (high-pressure seamless steel pipe for diesel engine), GB/T3639-1983 (cold drawn or cold-rolled precision seamless steel pipe), GB /T3094-1986 (cold-drawn seamless steel pipe special-shaped steel pipe), GB/T8713-1988 (precision inner diameter seamless steel pipe for hydraulic and pneumatic cylinders), GB/T5035-1993 (seamless steel pipe for automobile axle casing), API SPEC5CT -1999 (Specification for Casing and Tubing), etc.

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