Seamless steel pipe is an important type of steel pipe, and the quality of seamless steel pipe also needs to be grasped. After the seamless steel pipe factory produces a batch of products, quality inspection is required. What are the main content and methods of the common seamless steel pipe quality inspection? Let's have a detailed understanding with the editor of the seamless steel pipe factory. What is the relevant detection method of seamless steel pipe:


seamless steel pipe


The inspection and test of seamless steel pipe material verification performance should have the following contents.


(1) When the seamless steel pipe is inspected, if one of the following conditions is encountered, the calibration inspection shall be carried out.


① The certificate does not match the heat or steel number of the delivered seamless steel pipe;


② There is no steel number and heat number identification on the steel pipe or sign;


③ When the chemical composition or mechanical properties on the certificate are not complete, make up the test for the missing items.


(2) Provisions for the calibration inspection of seamless steel pipes.


① For all seamless steel pipes, the outer diameter, wall thickness and length of the pipes should be measured one by one, and their dimensions should meet the requirements of relevant standards;


② All seamless steel pipes should be numbered one by one and their hardness checked;


③ Take one of high and low hardness from each batch of seamless steel pipes, and prepare 5 samples for each of them, including two for tensile test, two for impact test, and one for flattening or cold-bending test. Test methods and evaluation Standards comply with the relevant provisions of the country.


④ Take samples for chemical analysis from the seamless steel pipe or specimen used for mechanical property test.


When there is no non-destructive testing certificate from the manufacturer, the non-destructive testing inspection shall be carried out one by one; although there is a non-destructive testing certificate from the manufacturer, if defects are found through visual inspection, 10% shall be randomly checked for testing. If there are still unqualified ones, they should be checked one by one.