Sleeve coupling is necessary for connecting two pipe sleeves. The manufacturing method is the same as seamless pipe
, and domestic J55 and n80Q special steel products are used. The ends of the steel pipes are internally threaded to connect the upper and lower pipes. In order to ensure the tightness of the joints, the thread accuracy requirements are more stringent.
Used to connect the upper and lower lines.
The domestic bushing is divided into two parts: the casing is not thickened, the casing is connected and the thicker oil sleeve is.
Three is the processing process
Automobile face - car outer ring boring - car line inspection - phosphating