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该产品是汽车发动机的关键零部件之一。采用马氏体和奥氏体钢惯性摩擦焊接、司太立堆焊以及盐浴软氮化等当今气门制造的先进技术精制而成,具有耐
This product is one of the key components of a car engine. Using martensitic and austenitic steel inertial friction welding, the Secretary Stanley surfacing and salt bath soft nitriding and other current valve manufacturing advanced technology refined, with resistance