Round hollow steel|round hollow steel

Shandong Pengrui Rock Drilling Technology Co., Ltd. produces Linhai Round Hollow Steel|Round Hollow Steel

The pipe casting method is a pipe casting method with national characteristics. Although it is used in foreign countries and will not be eliminated soon, it is round hollow steel, but it has survived for decades in the land of China. The pipe casting method has survived for decades.

The main reasons are: the inner lining pipe plays a key role. The correctly selected inner lining pipe is round hollow steel near the sea, and the corrosion and fatigue resistance is better than that of the hollow steel matrix; the reasonable pipe casting method leads to

Foreign pipe casting method small drill rods have not been able to enter the Chinese market for decades

In addition, there are also seamless steel pipe production methods for the production of hollow steel, namely “billet hot perforation, annealing, pickling and cold drawing” (referred to as “hot piercing and cold drawing” method) or “billet hot perforation, one or three rolls of hot-rolled diameter reduction, one tip and one rolling die hot drawing” (referred to as “hot piercing and hot drawing” method).In the late 1960s, when buying round hollow steel, China also experimented with the “coating” method, the “ordinary pipe casting” method, and the “alloy pipe casting” method to produce hollow steel.So far“ the "alloy pipe casting pipe" method and the ”hot perforation reducing diameter and one hot drawing" method have become the two main process methods for the production of hollow steel in our country.The latter is only suitable for the production of less than 32mm and the length does not exceed 4.5m small and medium-sized hollow steel.