In order to be suitable for the leadfree gasoline and meet the demand of automotive exhaust gas equipment, exhaust valve seat made of high-chromium cast iron is developed.
为适应汽油无铅化及汽车排气净化装置的要求，开发出了高铬铸铁排气阀座。
In order to be suitable for the leadfree gasoline and meet the demand of automotive exhaust gas equipment, exhaust valve seat made of high-chromium cast iron is developed.
为适应汽油无铅化及汽车排气净化装置的要求，开发出了高铬铸铁排气阀座。
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