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We have develop a new technology to shape valve spring retainer by low carbon alloy steel extrusion ,after its surface carburized treatment ,it can improve the toughness of core and hardness of surface ,at the same weight ,its strength will be 2 times than parts made by medium carbon steel s quenched and tempered treatment ,its reliability has been improved to meet modern engine further strengthened and weight reduce requirements .
Valve Spring Retainer