The common nondestructive testing methods include: ray detection, magnetic powder (or magnetic flux leakage) detection, penetration testing, ultrasonic testing, eddy current testing.1. Ray detection (RT)One of the earliest methods of nondestructive testing has been widely used to test the internal

The Rockwell hardness is an index of the hardness value determined by the depth of the indentation plastic deformation, and 0.002 mm as a hardness unit. Using of different indenters and different test forces in the Rockwell hardness test results in different combinations, corresponding to different

Cold rolled or cold drawn seamless steel tube is used in mechanical structure and hydraulic equipment of high dimensional accuracy and suface finish good.Ray seamless steel tube normally use 1010,1020,1045 etc high qaulity carbon steel and 16Mn or 30CrMo or 40Cr etc alloy steel tube .

Cold drawn steel tube technology is more and more important for us to focus on, this technology has been widely used at present, to promote the development of the industry as a whole and its specific advantages are obvious, the cold drawn technology improved the efficiency of the whole,

Steel pipes will rust if they are exposed for a long time. If they are buried for a long time, the surface will also be oxidized, if not cleaned. Then it will affect the normal function. In particular, 40Cr seamless steel tubes, which are generally used in important fields of industry,

1. The molding process of the tube :① Welded pipe is cut from steel strip to narrow steel strip, and then wrapped into tube with die cold processing. And then a special welding seam welded pipe. The outer welds are polished. The internal burr of the ordinary welded pipe is not hit. Only the precisio

We can often see the fire hydrant system in our daily life. And we also use this in everywhere like in building, in warehouse, in Cinema and others. But, do you know how to choose the pipe of fire hydrant system?In common condition, it used the seamless steel tube to produce,