How Seamless Carbon Steel Pipe is Made

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How

Seamless Carbon Steel Pipe

is Made

Seamless carbon steel pipes are widely used in various industries due to their exceptional strength, durability, and corrosion resistance. These pipes are manufactured through a unique process that involves heating a solid steel billet to a high temperature and then rolling it to form a hollow tube. In this article, we will provide a detailed overview of how

Seamless carbon steel pipes are widely used in various industries due to their exceptional strength, durability, and corrosion resistance. These pipes are manufactured through a unique process that involves heating a solid steel billet to a high temperature and then rolling it to form a hollow tube. In this article, we will provide a detailed overview of how

seamless steel pipes

are made, including the different stages of the manufacturing process and the equipment used.

                                                          Seamless Carbon Steel Pipe

Stage 1: Melting

The first stage of manufacturing seamless carbon steel pipes involves melting the steel. The steel is melted in a furnace, which is heated to a temperature of around 2,000 degrees Fahrenheit. The furnace is typically fueled by natural gas or electricity and is designed to melt large quantities of steel at a time.

The furnace is lined with refractory materials that can withstand the high temperatures and prevent the steel from sticking to the walls. The steel is loaded into the furnace in the form of scrap metal or iron ore, along with other additives such as limestone, which helps remove impurities from the steel.

Once the steel is melted, it is poured into a ladle and transported to the next stage of the manufacturing process.

Stage 2: Casting

The second stage of manufacturing seamless carbon steel pipes involves casting the steel into a solid billet. The molten steel is poured into a mold, which is typically made of cast iron or steel. The mold is designed to shape the steel into a solid billet, which is a long, cylindrical piece of steel that is used as the starting material for making seamless carbon steel pipes.

The mold is cooled using water or air, which helps solidify the steel and prevent it from sticking to the walls of the mold. Once the steel has solidified, the mold is opened, and the billet is removed.

Stage 3: Heating

The next stage of manufacturing seamless carbon steel pipes involves heating the solid billet to a high temperature. The billet is heated to a temperature of around 2,200 degrees Fahrenheit, which softens the steel and makes it easier to work with.

The heating process is typically done in a furnace, which is similar to the one used for melting the steel. The furnace is designed to heat the billet evenly and prevent it from warping or cracking during the heating process.

The heating time depends on the size and thickness of the billet, but it typically takes several hours to heat the billet to the desired temperature.

Stage 4: Rolling

Once the billet is heated, it is rolled to form a hollow tube. The rolling process involves passing the billet through a series of rollers that gradually reduce its diameter and thickness. The rollers are typically made of steel and are designed to apply pressure evenly to the billet, which helps shape it into a seamless tube.

The rolling process may involve several passes through the rollers, depending on the size and thickness of the tube. Each pass through the rollers reduces the diameter and thickness of the tube, which helps shape it into the desired size and shape.

The rolling process may also involve other equipment, such as a piercing mandrel, which is used to create a hole in the center of the billet. This hole is used as the starting point for forming the tube.

Stage 5: Cutting

Once the tube is formed, it is cut to the desired length and shape. The ends of the tube are then chamfered to ensure a smooth, seamless finish. The cutting process may involve several steps, depending on the size and shape of the tube.

The cutting process may be done using a saw, plasma cutter, or other cutting equipment. The equipment used depends on the size and thickness of the tube and the accuracy required for the cut.

Once the tube is cut, it is inspected for defects and other quality issues. Any defects are repaired or the tube is discarded if it cannot be repaired.

Conclusion

Seamless carbon steel pipes are manufactured through a complex process that involves several stages, including melting, casting, heating, rolling, and cutting. The process involves using high temperatures and pressure to shape solid steel billets into seamless tubes that are highly durable and resistant to corrosion.

The equipment used in the manufacturing process is designed to handle large quantities of steel and apply pressure evenly to ensure the tubes are formed accurately and with minimal defects. Quality control is an essential part of the process, and any defects or quality issues are addressed before the tubes are shipped to customers.

The first stage of manufacturing seamless carbon steel pipes involves melting the steel. The steel is melted in a furnace, which is heated to a temperature of around 2,000 degrees Fahrenheit. The furnace is typically fueled by natural gas or electricity and is designed to melt large quantities of steel at a time.The furnace is lined with refractory materials that can withstand the high temperatures and prevent the steel from sticking to the walls. The steel is loaded into the furnace in the form of scrap metal or iron ore, along with other additives such as limestone, which helps remove impurities from the steel.Once the steel is melted, it is poured into a ladle and transported to the next stage of the manufacturing process.The second stage of manufacturing seamless carbon steel pipes involves casting the steel into a solid billet. The molten steel is poured into a mold, which is typically made of cast iron or steel. The mold is designed to shape the steel into a solid billet, which is a long, cylindrical piece of steel that is used as the starting material for making seamless carbon steel pipes.The mold is cooled using water or air, which helps solidify the steel and prevent it from sticking to the walls of the mold. Once the steel has solidified, the mold is opened, and the billet is removed.The next stage of manufacturing seamless carbon steel pipes involves heating the solid billet to a high temperature. The billet is heated to a temperature of around 2,200 degrees Fahrenheit, which softens the steel and makes it easier to work with.The heating process is typically done in a furnace, which is similar to the one used for melting the steel. The furnace is designed to heat the billet evenly and prevent it from warping or cracking during the heating process.The heating time depends on the size and thickness of the billet, but it typically takes several hours to heat the billet to the desired temperature.Once the billet is heated, it is rolled to form a hollow tube. The rolling process involves passing the billet through a series of rollers that gradually reduce its diameter and thickness. The rollers are typically made of steel and are designed to apply pressure evenly to the billet, which helps shape it into a seamless tube.The rolling process may involve several passes through the rollers, depending on the size and thickness of the tube. Each pass through the rollers reduces the diameter and thickness of the tube, which helps shape it into the desired size and shape.The rolling process may also involve other equipment, such as a piercing mandrel, which is used to create a hole in the center of the billet. This hole is used as the starting point for forming the tube.Once the tube is formed, it is cut to the desired length and shape. The ends of the tube are then chamfered to ensure a smooth, seamless finish. The cutting process may involve several steps, depending on the size and shape of the tube.The cutting process may be done using a saw, plasma cutter, or other cutting equipment. The equipment used depends on the size and thickness of the tube and the accuracy required for the cut.Once the tube is cut, it is inspected for defects and other quality issues. Any defects are repaired or the tube is discarded if it cannot be repaired.Seamless carbon steel pipes are manufactured through a complex process that involves several stages, including melting, casting, heating, rolling, and cutting. The process involves using high temperatures and pressure to shape solid steel billets into seamless tubes that are highly durable and resistant to corrosion.The equipment used in the manufacturing process is designed to handle large quantities of steel and apply pressure evenly to ensure the tubes are formed accurately and with minimal defects. Quality control is an essential part of the process, and any defects or quality issues are addressed before the tubes are shipped to customers.

Overall, the manufacturing process for seamless carbon steel pipes is a complex and demanding process that requires specialized equipment, skilled workers, and strict quality control. However, the result is a product that is highly sought-after in various industries due to its exceptional strength, durability, and corrosion resistance.

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,

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.

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.

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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~ x 1.0~150
GR.A &#;GR.B &#;GR.C
High temperature seamless carbon steel
ASTM A106
10.3~ 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)