Contact us take a free sample of the STKM 11A O.D. 4mm steel tubes The use of STKM11A tubes: STKM 11A tubes used for machinery, automobiles, bicycles, furniture, appliances and other machine parts. Our commonly used STKM11A tubes have an outer diameter ranging from 3mm to 20mm. Visit our website: STKM 11A Carbon Steel Tubes Inspection STKM 11A tubes detection method: The STKM 11A tubes is mainly non-destructive testing, the most commonly used are ultrasonic testing and industrial endoscopy testing. The use of ultrasonic waves to detect STKM 11A tubes is through the interaction of ultrasonic waves and STKM 11A tubes to study the radiance of reflection, transmission and refraction to achieve the purpose of detecting seamless steel tubes. How to identify the quality of STKM 11A tubes: 1. Whether the surface of STKM 11A tube is smooth? Due to the raw materials used, inferior shaped STKM 11A seamless steel tubes, unprofessional technical methods, and low cost,