... ,20# ,45# ,Q345, Q235 , standard:AISI,API,JIS Seamless steel pipe1Type: seamless pipes, welded pipes, welded pipes, rectangular pipes, square pipes ... , polished pipes, seamless tubes.2 Process methods: cold draw and cold rolled3 Surface ... About us : We are Tianjin Hong-Peng High-Pressure Alloy Pipe Sales Co.,ltd,which is a leading expoter and ...