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Difference of Hot Rolled And Cold Drawn Seamless Steel Pipe
Jun 22, 2020
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What are the differences between hot rolled seamless steel tube and cold drawn seamless steel tube?
According to the production method, steel pipe can be divided into two categories: seamless steel pipe and seamed steel pipe. Seamless steel pipe can be divided into hot-rolled seamless steel pipe, cold drawn seamless steel pipe, precision seamless steel pipe, hot expansion seamless steel pipe, cold spinning seamless steel pipe and extrusion seamless steel pipe. Seamless steel pipe is made of high quality carbon steel or alloy steel, including hot rolling and cold rolling (drawing). So what's the difference between hot rolled seamless steel pipe and cold drawn seamless steel pipe? Let's get to know.
What is hot rolled seamless steel pipe?
Hot rolling refers to the method of rolling above recrystallization temperature. The hot rolling technology can significantly reduce energy consumption and cost. During the process of hot rolling, the metal has high plasticity and low deformation resistance, which greatly reduce the energy consumption of metal deformation, and improve the processing technology of metal and alloy. That is to say, the coarse grains in casting state are broken, cracks are obviously healed, casting defects are reduced or eliminated. And the cast structure is transformed into deformed structure. Then, the processing performance of alloy is improved.
What is a cold drawn seamless steel pipe?
Cold drawn steel pipe is a kind of steel pipe, also known as cold-rolled pipe. That is, it is classified according to different production technology, which is different from hot-rolled (expanded) steel pipe. In the process of expanding the blank or raw material tube, it is produced by cold drawing for many times, usually on a single chain or double chain cold drawing machine of 0.5-100T. Cold rolled (drawn) seamless 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, machining pipes, thick wall pipes, small diameter cold drawn pipes with internal mold, as well as carbon thin-walled steel pipes, alloy thin-walled steel pipes, stainless thin-walled steel pipes and special-shaped steel pipes. The outer diameter of cold drawn steel pipe can reach 6mm. The wall thickness can reach 0.25mm. The outer diameter of thin-walled pipe can reach 5mm. The wall thickness is less than 0.25mm. The accuracy and surface quality are obviously better than that of hot-rolled (expanded) pipe, but the diameter and length are limited by the technology.
Difference between hot rolled seamless tube and cold drawn seamless tube.
1. Dimension precision: the dimension precision of cold-rolled seamless steel pipe is high.
2. Appearance: the surface of cold-rolled seamless steel pipe is bright, and the surface of hot-rolled seamless steel pipe has obvious oxide skin or red rust.
3. The caliber size: the caliber of cold-rolled seamless steel pipe is smaller than that of hot-rolled seamless steel pipe (mainly due to different machinery, each with its own specialty).
4. Price: the price of cold rolled seamless steel pipe is higher than that of hot-rolled seamless steel pipe.
5. Application: hot rolled seamless steel pipe is used for low size requirements for fluid transportation and mechanical structure, and cold rolled seamless steel pipe is used in high requirements for precision instruments, hydraulic system and pneumatic system.
According to the production method, steel pipe can be divided into two categories: seamless steel pipe and seamed steel pipe. Seamless steel pipe can be divided into hot-rolled seamless steel pipe, cold drawn seamless steel pipe, precision seamless steel pipe, hot expansion seamless steel pipe, cold spinning seamless steel pipe and extrusion seamless steel pipe. Seamless steel pipe is made of high quality carbon steel or alloy steel, including hot rolling and cold rolling (drawing). So what's the difference between hot rolled seamless steel pipe and cold drawn seamless steel pipe? Let's get to know.
What is hot rolled seamless steel pipe?
Hot rolling refers to the method of rolling above recrystallization temperature. The hot rolling technology can significantly reduce energy consumption and cost. During the process of hot rolling, the metal has high plasticity and low deformation resistance, which greatly reduce the energy consumption of metal deformation, and improve the processing technology of metal and alloy. That is to say, the coarse grains in casting state are broken, cracks are obviously healed, casting defects are reduced or eliminated. And the cast structure is transformed into deformed structure. Then, the processing performance of alloy is improved.
What is a cold drawn seamless steel pipe?
Cold drawn steel pipe is a kind of steel pipe, also known as cold-rolled pipe. That is, it is classified according to different production technology, which is different from hot-rolled (expanded) steel pipe. In the process of expanding the blank or raw material tube, it is produced by cold drawing for many times, usually on a single chain or double chain cold drawing machine of 0.5-100T. Cold rolled (drawn) seamless 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, machining pipes, thick wall pipes, small diameter cold drawn pipes with internal mold, as well as carbon thin-walled steel pipes, alloy thin-walled steel pipes, stainless thin-walled steel pipes and special-shaped steel pipes. The outer diameter of cold drawn steel pipe can reach 6mm. The wall thickness can reach 0.25mm. The outer diameter of thin-walled pipe can reach 5mm. The wall thickness is less than 0.25mm. The accuracy and surface quality are obviously better than that of hot-rolled (expanded) pipe, but the diameter and length are limited by the technology.
Difference between hot rolled seamless tube and cold drawn seamless tube.
1. Dimension precision: the dimension precision of cold-rolled seamless steel pipe is high.
2. Appearance: the surface of cold-rolled seamless steel pipe is bright, and the surface of hot-rolled seamless steel pipe has obvious oxide skin or red rust.
3. The caliber size: the caliber of cold-rolled seamless steel pipe is smaller than that of hot-rolled seamless steel pipe (mainly due to different machinery, each with its own specialty).
4. Price: the price of cold rolled seamless steel pipe is higher than that of hot-rolled seamless steel pipe.
5. Application: hot rolled seamless steel pipe is used for low size requirements for fluid transportation and mechanical structure, and cold rolled seamless steel pipe is used in high requirements for precision instruments, hydraulic system and pneumatic system.
