Differences between Precision Steel Pipe and Seamless Steel Pipe

1. The main feature of seamless steel pipe is that it has no welds and can withstand greater pressure. The product can be a rough cast or cold drawn part.
2. Precision steel pipe is a product that has appeared in recent years, mainly because the inner hole and outer wall dimensions have strict tolerances and roughness.

Features of cold drawn precision steel pipe: 

1). Smaller outer diameter. 

2). High precision and small batch production. 

3). The cold-drawn finished product has high precision and good surface quality. 

4). The horizontal area of steel pipe is more complicated. 

5). The performance of the steel pipe is superior, and the metal is denser.

Features of hot rolled precision steel pipe:

Hot-rolled precision steel pipes use continuous casting round tube billet slabs or blooming slabs as raw materials, heated by a walking heating furnace, high-pressure water descaling, and then enter the rough rolling mill, and the rough rolling materials enter the finishing mill after cutting the head, tail, and , Implementation of computer-controlled rolling, after the final rolling, it will go through laminar cooling and coiling by a coiler to become a straight hair coil. The head and tail of straight hair curlers are often tongue-shaped and fish-tail-shaped, with poor thickness and width accuracy, and the edges often have defects such as wave shape, hemming, and tower shape. The coil weight is heavier and the inner diameter of the steel coil is 760mm. After the straight hair coil is processed by a finishing line such as head-cutting, tail-cutting, trimming, and multi-pass straightening and leveling, then it is cut or re-coiled to become: hot-rolled steel plate, flattened hot-rolled steel coil, longitudinal Cut tape and other products. If the hot-rolled finished coil is pickled to remove the oxide scale and coated with oil, it becomes a hot-rolled pickled coil.

Precision Steel Pipe VS Seamless Steel Pipe:

1. Different name coverage
Precision steel pipes can be divided into welded steel pipes and seamless steel pipes according to different forming methods. Precision steel tubes are steel pipes that are defined only by their own tolerance size, smoothness, roughness and other technical requirements coefficients.

2. Different molding methods
Precision steel pipe: Generally formed by cold drawing or cold rolling, the processing technology can often control high precision and high finish.

Seamless steel pipe: Generally refers to the steel pipe formed by hot rolling and perforation of round steel. If the tolerance, smoothness, roughness and other requirements are not specified, it is often defaulted to general hot-rolled or cold-drawn seamless steel pipe.

3. Different accuracy and surface quality 

The main characteristics of precision steel pipes are high precision, good smoothness and excellent surface quality. Precision steel tubes can be seamless steel pipes, but seamless steel pipes are not necessarily precision steel tubes. This mainly depends on the dimensional accuracy, surface roughness, smoothness, etc. of the steel pipe.

Ordinary seamless steel pipes often refer to hot-rolled or cold-drawn seamless steel pipes with no special surface requirements. The surface of steel pipes is often dark brown, accompanied by oxide scale or floating rust.

4. Different application scopes

Precision steel pipe: It can often be directly used in mechanical parts, automobile and motorcycle parts, precision instruments, aviation, aerospace and other fields with high precision requirements.
Ordinary seamless steel pipes: often used as raw materials in the field of machining and as fluid pipes, gas pipes, etc. in chemical industry, electric power and other fields.

5. Steel pipe diameter sizes cover different ranges

Seamless steel pipes: Large, medium and small diameters are often the main ones, and large and medium diameters are more in stock.
Precision steel pipes: mostly medium and small diameters, among which small diameter precision steel pipes are more in stock.

6. Steel pipe customization requirements are different

Seamless steel pipe: The tolerance requirements of seamless steel pipes only need to meet the national standard. The minimum order quantity for hot rolling is often higher. The general minimum order quantity ranges from dozens of tons to hundreds of tons according to different calibers.

Precision steel pipe: Precision steel tube has higher tolerance requirements and generally needs to be customized according to the customer's tolerance range requirements. The minimum order quantity is flexible, ranging from a few tons to dozens of tons depending on the processing accuracy and caliber size.

Conclusion:
To sum up, there are differences between precision steel pipes and seamless steel pipes in terms of name coverage, forming methods, accuracy and surface quality, application scope, caliber size coverage, customization requirements, etc. Understanding these differences is important for proper selection and use of steel pipe.