The leading honed tube suppliers tells you what is the difference between cold drawn seamless tubes and hot rolled seamless pipes
The difference between hot finishing and cold drawing:
Hot rolling & cold drawing both can be used to produce seamless steel tubes, their diffence is that hot rolling is hot finishing, and cold drawing is cold finishing.
The main difference:
- Hot rolling is rolling above the recrystallization temperature, cold rolling is rolling below the recrystallization temperature; cold rolling sometimes has heating, but the temperature is relatively low, because processing will occur after cold rolling Hard, if the requirements for the forming of the material are relatively high, annealing is also required.
- Cold rolling and hot rolling are generally plates or profiles, while cold drawing is generally cylindrical cross-section wire. In addition, hot-rolled plates are generally steel with high alloy content and high strength, while cold-rolled steel is low-carbon and low-alloy steel. Cold rolling can increase the strength and ensure the surface quality of the material.
The difference between cold-drawn seamless steel tube and hot-rolled seamless steel pipe is different from that of plate.
- Seamless steel pipes are divided into two types: hot-rolled (extruded) seamless steel pipes and cold-drawn (pilgered) seamless steel tubes due to their different manufacturing processes.
- Cold drawn (pilgered) seamless tubes are divided into two types: round tubes and special-shaped tubes. Cold-drawn steel tubes generally requires multiple drawing, and there must be corresponding stress relief annealing between each drawing to ensure the smooth progress of the next cold drawing.
- From the outside, the cold-rolled seamless steel pipe tends to have a small diameter, and the hot-rolled seamless steel pipe tends to have a large diameter.
- The precision of cold-rolled seamless steel pipe is higher than that of hot-rolled seamless steel pipe, and the price is also higher than that of hot-rolled seamless steel pipe.
- Cold-drawn seamless pipes generally have a small diameter, mostly below 406 mm, especially the precision of the outer diameter of cold-drawn seamless pipes is very high, and the length of cold-drawn seamless pipes is generally shorter than that of hot-rolled seamless pipes.
- In terms of wall thickness, cold drawn seamless pipes are more uniform than hot rolled seamless pipes.
- Cold drawn seamless tube is more popular for producing honed tube and chrome plated ID tube, while hot rolled seamless pipes are less popular on producing honed tubes and hollow bar. Only when the hydraulic cylinder barrel size is very large, there is no such big size of cold drawn tube is available, then the hot rolled tubes are used to produce the hydraulic cylinder tubes.
Our factory is a leading high quality honed tube manufacturer and supplier in China. Our factory produces various materials and sizes of cold drawn seamless tube for hydraulic cylinder tube, besides this, the cold drawn tubes can be usde in many different areas as fluid convey lines.
