Quenching and tempering consists of a two-stage heat-treatment process. Stage one includes hardening, in which the steel is austenitized to approximately 900°C and then quickly cooled with water or oil. Stage two consists of tempering the material to obtain the desired material properties. Quenching and tempering achieves a fine-grained and homogeneous microstructure. Quenched and tempered steel is characterized by high strength and good ductility.

--Precise custom outer diameter and inner diameter
--Tight tolerances, resulting in reduced machine time / Dimensional accuracy
--Smooth and Clean OD and ID surfaces
--Excellent machining characteristics
--Wider range of physical properties attainable through process and annealing options

--Materials :ASTM519/1026/1035/1045 seamless steel pipe
--Inner Surface roughness is less than 0.4μm
--The Low-pressure Hydraulic cylinder can be used 20# steel pipe
--The High-pressure Hydraulic cylinder can be used 45# steel pipe
--The commonly used materials are 20#,35#，and 45# seamless steel pipe