What is Carbon Steel Pipe?

What is carbon steel pipe?

Carbon steel pipe & tube 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. Due to its strength and ability to withstand pressure, carbon steel pipes are used in a variety of heavy industries such as infrastructure, ships, stills, and fertilizer equipment. 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.

Carbon steel can be further divided into low carbon steel, medium carbon steel and high carbon steel, mainly depending on the carbon content in the steel.

Mild steel (also known as light steel): The carbon content is usually between 0.04% and 0.30%. Low carbon steel has good ductility and toughness, can be processed hot and cold, and is easy to weld. Commonly used low carbon steels include Q195, Q215, Q235, etc.
Medium carbon steel: The carbon content is usually between 0.30% and 0.60%. Medium carbon steel has high strength and hardness, but low ductility and toughness. Commonly used medium carbon steels include 45# steel, 40Cr and so on.
High Carbon Steel: The carbon content is usually between 0.60% and 2.00%. High carbon steel has high strength and hardness, but low ductility and toughness, and poor weldability. Commonly used high carbon steels include 65Mn, T8, T10, etc.

Carbon steel pipes can be divided into seamless steel pipes and welded steel pipes according to the production method. Seamless steel pipes are made by hot rolling or cold drawing, and have high strength and tightness. Welded steel pipe is made by rolling steel plate or steel strip into a cylindrical shape, and then connecting the weld seams by resistance welding, submerged arc welding and other methods.

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 piping provides safety and durability. It is an ideal material for structural applications due to its impact resistance and its imperceptibility to harsh environmental conditions such as stress or extreme weather.
 
The incredible strength of carbon steel means that carbon steel pipes can be made thinner and use less material while still being able to transport large volumes. This makes carbon steel piping a cost-effective material. Not only can the use be reduced, but the carbon steel can also be recycled, which is environmentally friendly and economical.
 
Carbon steel pipe is a versatile material due to its ease of fabrication. We can produce products in various thicknesses and sizes. It's also easy to cut and bend to fit wherever needed. It also connects easily to fittings, valves and other plumbing fittings.

Application fields of carbon steel pipe:

Carbon steel pipe has good corrosion resistance, pressure bearing capacity and machinability, and is widely used in many fields.

1. Oil and natural gas industry: Carbon steel pipe is an important pipeline material for transporting oil and natural gas, with high strength, reliability and corrosion resistance.
2. Construction and structural engineering: Carbon steel pipes are used in construction and structural engineering, such as bridges, high-rise buildings, roads and tunnels, etc., to support and transmit loads.
3. Automobile manufacturing industry: Carbon steel pipes are used in exhaust pipes, frame and chassis and other components in the automobile manufacturing industry, and have good wear resistance and strength.
4. Mechanical engineering: Carbon steel pipes are used in conveying systems, pressure vessels, hydraulic systems and other components in mechanical engineering, and have pressure bearing capacity and reliability.
5. Chemical industry: Carbon steel pipes are used in the chemical industry for conveying systems, reactors, storage tanks and other components, with corrosion resistance and high temperature resistance.

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)