How is stainless steel pipe cold worked?
Stainless steel seamless pipes and welded pipes can be cold-worked—cold-rolled and cold-drawn to meet higher requirements for cold-worked products.
Cold working makes the product have the following characteristics: ①Improve the surface, improve the corrosion resistance due to the improved surface finish; ②Further improve the dimensional accuracy, after cold rolling or cold drawing with a mandrel, not only improve the outer diameter accuracy, but also improve the wall thickness The precision ③ can produce steel pipes with smaller diameters and thinner walls. ④Cold deformation combined with heat treatment can improve the mechanical properties. ⑤Special sizes and special sections (except round) can be produced.
(1) Cold drawn
The diameter of the cold-drawn steel pipe is heated or at room temperature, and the surface of the end neck is pickled to remove the oxide scale, and then coated with lubricant.
cold drawn. There are three methods of cold drawing. The cold drawing of the plug with the inner diameter of the finished product is called cold drawing of the plug. The cold drawing of the mandrel with the same length as the tube is called the cold drawing of the mandrel or the free cold drawing without the mandrel. The inner wall of the mandrel is cold drawn and the inner wall is smooth, which can achieve a large deformation ratio, and is suitable for cold drawing of long stainless steel pipes.
The drawing machine can be chain type, hydraulic or hydraulic. The chain drawing can draw two or more steel pipes at a time. In order to reduce the wear between the cold drawn pipe and the mold, the quality of the lubricant is very important to improve the efficiency. Usually, the surface iron is removed by pickling and then lubricated.
(2) Cold rolled
Cold rolling is a cold working method in which two rolls have a roll pass that gradually becomes smaller along the circumference, and a mandrel with a slope is passed through it, which is called the cold Pilgrim method. A 3-roll cold rolling mill can also be used.
This method is the same as the principle of the cold pilger mill. The deformation process is in a state of compressive stress, and it is difficult to draw high-alloy stainless steel. This method can be used. Due to the high dimensional accuracy of the full circumference machining , but the efficiency is low, and it is difficult to make and adjust the roll.
How is stainless steel pipe cold worked?
Stainless steel seamless pipes and welded pipes can be cold-worked—cold-rolled and cold-drawn to meet higher requirements for cold-worked products.
Cold working makes the product have the following characteristics: ①Improve the surface, improve the corrosion resistance due to the improved surface finish; ②Further improve the dimensional accuracy, after cold rolling or cold drawing with a mandrel, not only improve the outer diameter accuracy, but also improve the wall thickness The precision ③ can produce steel pipes with smaller diameters and thinner walls. ④Cold deformation combined with heat treatment can improve the mechanical properties. ⑤Special sizes and special sections (except round) can be produced.
(1) Cold drawn
The diameter of the cold-drawn steel pipe is heated or at room temperature, and the surface of the end neck is pickled to remove the oxide scale, and then coated with lubricant.
cold drawn. There are three methods of cold drawing. The cold drawing of the plug with the inner diameter of the finished product is called cold drawing of the plug. The cold drawing of the mandrel with the same length as the tube is called the cold drawing of the mandrel or the free cold drawing without the mandrel. The inner wall of the mandrel is cold drawn and the inner wall is smooth, which can achieve a large deformation ratio, and is suitable for cold drawing of long stainless steel pipes.
The drawing machine can be chain type, hydraulic or hydraulic. The chain drawing can draw two or more steel pipes at a time. In order to reduce the wear between the cold drawn pipe and the mold, the quality of the lubricant is very important to improve the efficiency. Usually, the surface iron is removed by pickling and then lubricated.
(2) Cold rolled
Cold rolling is a cold working method in which two rolls have a roll pass that gradually becomes smaller along the circumference, and a mandrel with a slope is passed through it, which is called the cold Pilgrim method. A 3-roll cold rolling mill can also be used.
This method is the same as the principle of the cold pilger mill. The deformation process is in a state of compressive stress, and it is difficult to draw high-alloy stainless steel. This method can be used. Due to the high dimensional accuracy of the full circumference machining , but the efficiency is low, and it is difficult to make and adjust the roll.