Precision seamless steel pipe is a kind of high-precision steel pipe material after cold drawing or hot rolling. Due to the advantages of no oxide layer on the inner and outer walls of precision steel pipe, no leakage under high pressure, high precision, high finish, no deformation after cold bending, no cracks after expansion and flattening, it is mainly used to produce pneumatic or hydraulic components, such as cylinders or oil cylinders. It can be seamless pipes or welded pipes.
The chemical composition of precision steel pipes is carbon C, silicon Si, manganese Mn, sulfur S, phosphorus P, chromium
The commonly used materials for precision seamless steel pipes are 10#, 20#, 35#, and 45#. There are many materials that can be produced. As long as the steel is not too hard, it can basically be produced according to needs. Such as: 10#, 35#, 16Mn, 40Cr, etc.
Precision seamless steel pipes are usually produced by cold rolling. The specific process is as follows:
Round steel-perforation-pickling-cold rolling-saw head-bundling
Seamless pipe→pickling→cold rolling→saw head→bundling
Features of precision seamless steel pipe
1. High precision, saving the loss of mechanical processing user labor and materials.
2. Many specifications and wide application range,
3. Cold-rolled finished products have high precision, good surface quality and good straightness.
4. The inner diameter of the steel pipe can be made into a hexagonal shape,
5. The steel pipe has better performance and the metal is denser.
Compared with solid steel such as round steel, seamless steel pipe has a lighter weight when the bending and torsional strength are the same. It is an economical cross-section steel and is widely used in the manufacture of structural parts and mechanical parts. While inheriting the advantages of seamless steel pipes, precision steel pipes also have some of their own characteristics. Using precision to manufacture annular parts can improve material utilization, simplify manufacturing processes, save materials and processing time, such as rolling bearing rings, jack sleeves, etc., which have been widely manufactured with precision steel pipes. The promotion and application of precision seamless steel pipes is of great significance to saving steel, improving processing efficiency, reducing processing procedures or equipment investment, saving costs and processing time, increasing production and material utilization, and at the same time helping to improve product quality and reduce costs, which is of great significance to improving economic benefits. Generally, industries with high precision requirements use precision seamless steel pipes, and those without precision requirements mostly use seamless pipes. After all, the price of precision seamless steel pipes of the same specifications is higher than that of seamless pipes.
Classification
Precision seamless pipes, precision hydraulic seamless steel pipes, cold-drawn precision seamless steel pipes, cold-rolled precision seamless steel pipes, high-precision seamless steel pipes, precision bright seamless steel pipes.
Main varieties
DIN/EN series high-precision precision bright seamless steel pipes, special steel pipes for hydraulic systems, special steel pipes for automobile manufacturing
Main standards
DIN2391, DIN2445, EN10305, GB/T 3639……….
Main materials
ST35 (E235), ST37 、ST45(E255)、ST52(E355)、10#、20#、35#、45#…………
Main delivery status
NBK(+N)GBK(+A)BK(+C)BKW(+LC)BKS(+SR)
Features
No oxide layer on the inner and outer walls of the steel pipe, withstands high pressure, no leakage, high precision, high finish, no deformation after cold bending, no cracks after expansion and flattening, anti-rust treatment on the surface, widely used in steel pipes for hydraulic systems, injection molding machines Steel pipes, steel pipes for hydraulic presses, steel pipes for shipbuilding, EVA foaming hydraulic machinery, steel pipes for precision hydraulic cutting machines, shoemaking machinery, hydraulic equipment, high-pressure oil pipes, hydraulic oil pipes, ferrule joints, steel pipe joints, rubber machinery, forging machinery, die-casting machinery, engineering machinery, high-pressure steel pipes for concrete pump trucks, sanitation vehicles, automobile industry, shipbuilding industry, metal processing, military industry, diesel engines, internal combustion engines, air compressors, construction machinery, agricultural and forestry machinery, etc., can completely replace imported seamless steel pipes of the same standards.
