What is Carbon Steel Pipe?

What is carbon steel pipe?

Carbon steel pipe is also called CS pipe. Carbon steel pipes are made of steel ingots or solid round steels through perforation into capillary tubes, which are then hot-rolled, cold-rolled or cold-drawn. Carbon steel pipe plays an important role in my country's steel pipe industry.

Types of carbon steel pipes:

Carbon steel pipes are 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.

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 (drawn) carbon steel pipes also include carbon thin-walled steel pipes, alloy thin-walled steel pipes, non- Rust thin-walled steel pipe, special-shaped steel pipe. The outer diameter of hot-rolled seamless pipes is generally greater than 32mm, and the wall thickness is 2.5-75mm. The outer diameter of cold-rolled seamless pipes can reach 6mm and the wall thickness can reach 0.25mm. The outer diameter of thin-walled pipes 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-structured steel such as 10, 20, 30, 35, and 45, low-alloy structural steel such as 16Mn and 5MnV, or alloy steel such as 40Cr, 30CrMnSi, 45Mn2, and 40MnB, which is hot-rolled or cold-rolled. 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. Generally, carbon steel pipes are used to ensure the strength and flattening test. Hot-rolled steel pipes are delivered in hot-rolled or heat-treated state; cold-rolled steel pipes are delivered in heat-treated state.

CS Pipe Specs and Standards

ASTM/ASME

Product name	Executive standard	Dimensions (mm)	Steel code/Steel grade
Black and hot-dip galvanized seamless steel pipe	ASTM A53	0.3~1200 x 1.0~150	GR.A 、GR.B 、GR.C
High temperature seamless carbon steel	ASTM A106	10.3~1200 x 1.0~150	GR.B、GR.C
Seamless cold drawn mild steel heat exchanger and condenser tubes	ASTM A179	10.3~426 x 1.0~36	Low-carbon steel
Seamless carbon steel boiler tubes for high pressure	ASTM A192	10.3~426 x 1.0~36	Low-carbon steel
Seamless cold drawn intermediate alloy steel heat exchanger and condenser tubes	ASTM A199	10.3~426 x 1.0~36	T5、T22
Seamless medium carbon steel boiler and superheater tubes	ASTM A210	10.3~426 x 1.0~36	A1、C
Seamless ferritic and austenitic alloy steel boiler, superheater and heat exchanger tubes	ASTM A213	10.3~426 x 1.0~36	T5、T9、T11、T12、T22、T91
Seamless carbon and alloy steels for mechanical tubing	ASTM A333	1/4″~42″ x SCH20~XXS	Gr1、Gr3、Gr6
Seamless and welded carbon and alloy steel pipes for cryogenic use	ASTM A334	1/4″~4″ x SCH20~SCH80	Gr1、Gr6
Seamless cold drawn carbon steel feed water heater tube	ASTM A556	10.3~426 x 1.0~36	A2、B2

Advantages of carbon steel:

Carbon steel has high strength, ductility and toughness at low cost and is used in heavy machinery to make heavy duty parts. The total amount of gold is generally less than 5%, which has greater impact toughness, and can obtain better mechanical properties through heat treatment. Casting low-alloy steel has better performance than carbon steel, which can reduce the quality of parts and improve service life.

Carbon Steel vs Black Steel:

Carbon steel is easily corroded. Blackening is a process that produces a tough oxide coating with some corrosion resistance. 
Black steel is made of ungalvanized steel. It gets its name from the scaly dark iron oxide coating on its surface. It is used in applications that do not require galvanized steel.
There are different classes of carbon steel. They are classified by the percentage of carbon mixed with the basic element iron.

Carbon steel grade carbon content %

Ultra-high carbon steel 1.00 – 2.00
High-carbon steel 0.60 – 0.99
Carbon steel 0.30 – 0.59
Low-carbon steel 0.16 – 0.29
Ultra low carbon steel 0.05 – 0.15

Black steel pipe is manufactured to be seamless, which makes it a better type of gas transport. It can be used in fire sprinkler systems as it is more resistant to fire than galvanized pipe. It is called black steel pipe due to its dark surface formed from iron oxide during the manufacturing process.

The strength of black steel pipe makes it ideal for conveying water and natural gas in rural and urban areas, as well as protecting electrical wiring and conduits carrying high-pressure steam and air. The oil and oil industry uses black steel pipes to transport large quantities of oil to remote areas. This is beneficial because the black steel pipe requires little maintenance. Other uses for black steel pipes include gas distribution inside and outside the home, wells and sewage systems. Black steel pipes are never used to transport drinking water.

Permanent Steel Manufacturing Co.,Ltd as a carbon steel tube supplier, has years of experience in manufacturing of carbon steel pipe, stainless steel tube, hollow section, pipe fittings. (Fluid Pipe/Boiler Tube/Fire Pipe/Line Pipe/Structure Tube)