Precision seamless pipe

 Definition of precision seamless tubes

Precision seamless tube is a kind of high precision steel tube material through cold-drawn or hot-rolled treatment, due to the advantages of precision steel tubes without oxide layer on the inner and outer walls, no leakage under high pressure, high precision, high finish, no deformation in cold bending, flaring, flattening and no cracks, etc., so it is mainly used to produce pneumatic or hydraulic components of the products, such as cylinders or cylinders, which can be seamless tubes, but also welded tubes precision steel tubes, chemical composition, there are carbon C , silicon Si, manganese Mn, sulfur S, phosphorus P, chromium Cr, seamless steel tubes and round steel and other solid steel compared to the same bending and torsion strength, the weight is lighter, it is a kind of economic cross-section steel, widely used in the manufacture of structural components and mechanical parts.

Common Materials

The common materials of precision seamless tubes are 10#, 20#, 35#, 45#.

Production process

Precision seamless tubes are usually produced by cold rolling process.

The specific process is as follows:

Round steel → piercing → pickling → cold rolling → sawing → bundling

Seamless tube → pickling → cold rolling → sawing → bundling

Characteristic Advantages

1. High precision, saving the loss when machining user's labor and material.

2. Many specifications, wide range of applications.

3. Cold rolled finished products have high precision, good surface quality and straightness.

4. The inner diameter of steel pipe can be made into hexagonal shape.

5. The performance of steel pipe is more superior, the metal is more dense.

Relevant standard index of precision seamless pipe

1. Main varieties of precision seamless pipe: DIN series precision precision bright precision seamless pipe, precision seamless pipe for hydraulic system, precision seamless pipe for automobile manufacturing

2. Main standards: DIN2391, din2445, en10305, DIN1629, din1630, ASTM A179

3. Main material of precision seamless pipe: ST35 (E235) st37.4 ST45 (e255) ST52 (E355)

4. Main delivery status: NBK (+ n) GBK (+ a) BK (+ C) BKW (+ LC) BKS (+ Sr)

5. Main features: no oxide layer on the inner and outer walls of precision seamless pipe, no leakage under high pressure, high precision, high finish, no deformation in cold bending, no crack in expanding and flattening

6. Precision seamless pipe is mainly used in hydraulic system piping, automobile manufacturing piping, military industry, engineering machinery, railway locomotive, aerospace, ship, injection molding machine, die-casting machine, machine tool, diesel engine, petrochemical industry, power station, boiler equipment and other industries.