To satisfy customers' requirement, the inspector carries out the final inspection and test to finish pipe products according to the product standard executed in the order by customers. According to the stipulated standard requirements, analysis to chemical components of purchasing materials and finished products is carried out to strictly control the materials , mechanical performance and chemical performance etc. of finished products are tested, as well as eddy current test and ultrasonic nondestructive test are carried out, so as to guarantee the products' quality.