... .Steel grade: St35, St37, St45, St52, 10#,20#,SAE1010,SAE1020;3.Condition: NBK,BK4.Size: OD4.0-76mm, WT: 0.5 ... of automobile, hydraulic system of machinery and high pressure tubingof diesel engine.7.Characteristic: high cleanness, smooth on the inner surface, chemical ... drawn ;blakc annealed;bright annealed;hot dipped galvanized;black phosphatic diesel injection oil tube