haiyan Sentai steel co ltd is located in Haiyan Zhejiang province ,which is near Shanghai and Ningbo ,and it is to the east of the Hangzhou bay bridge,and its annual production capability is 100,000 tons of seamless steel tubes with the range of 10mm to 180 mm in external diameter and 1mm to 30 mm in wall thickness.Our main products are petroleum steel tubes,structural steel tubes ,fluid steel tubes and so on.our principle is " better quality , top-ranking brand,continuous learning,good service" we warmly welcome friends to cooperate with us and make the bright future together. Sentai steel tube Connect the world Create the future!