The purpose of aging heat treatment of alloy steel pipe is to overcome the deformation, surface roughness reduction and decarburization of the steel pipe surface after the alloy steel pipe is quenched and tempered (or normalized). It is a cold-drawn aging heat treatment method for steel pipes for hydraulic cylinders with high strength, high hardness, good wear resistance, strong plasticity, high pressure resistance. It has no deformation, and no decarburization.

Aging heat treatment method of alloy steel pipe:
(1) Polish the outer surface and honing the inner hole of the hot-rolled round alloy steel pipe;
(2) Adopt complete annealing heat treatment process for hot-rolled alloy steel pipe: 880-9000, heat preservation 50-60min.
(3) The hot-rolled alloy steel pipe is drawn after surface lubrication;
(4) The aging heat treatment process is adopted for the steel pipe for the cylinder tube in the cold working state: 300-320℃, heat preservation 250-300min.