The internal and external surface quality of ERW steel pipe must be inspected with naked eyes or with special equipment. 

1 Of course, the simplest inspection method is manual visual inspection, but it requires a lot of manpower and labor is heavy, it is easy to make mistakes, and it is not easy to realize mechanization and automation. 

2 The use of non-damage inspection methods is labor-saving and reliable, and can be mechanized and automated; therefore, it has been extensively developed. In recent years, automatic measuring instruments such as thickness gauges and optical pulse diameter gauges have been widely used in the inspection of the geometric dimensions of thick-walled seamless steel pipes. These instruments for measuring the size of thick-walled seamless steel pipes can not only be used for the inspection of finished pipes, but also can be placed on the process line for monitoring and measurement, which facilitates effective and timely control of thick-walled seamless steel pipes during the rolling process. The dimensional tolerance of the seam steel pipe is improved, thereby improving the accuracy of the geometrical dimension of the thick-walled seamless steel pipe and reducing (reduce) defective products with out of tolerance.

Changsha Xiangjia Metal Materical Co., Ltd. the Steel Pipe Division of ADTO GROUP, is one of the leading manufacturers of steel products in China. We specializes in manufacturing all kinds of steel pipe in various grades and sizes. Years of production experience and manufacturing facilities who have a capacity of 200,000 tons per annual will ensure the good quality and competitive duration of our products.