... Roughness:0.4~0.8umsteel pipes for hydraulic useMaterial: C20, CK45, etc ... /mm25δs%175HBCk45660 σN/mm2630σsN/ mm24δs%207HBST52580σ N/mm2420σsN/ mm210δs%190HB27SiMn840σ ... 426mm Length: 5.8~13m(as your requirment) Material: 20#, 45#, 16Mn, Q195, Q235, ... Company ProfileLiaocheng Xinglong Seamless Pipe Manufacturing Co., Ltd is founded in 2004, ... GB3087-2008,GB5310-1995,GB6479-2000,ASTM A 53, A106, API 5L/5CT, ...