This standard specifies the examination of heat-treated metallographic structure of diesel injection nozzle, plunger for injection pump or high pressure supply pump and delivery valve (the effective thickness of parts is less than or equal to 12mm) for injection pump or high pressure supply pump.
This standard is applicable to the metallographic examination of GCr15 steel precision coupled parts; the metallographic examination of carburization and heat treatment of alloy structure steel needle valve body; and the metallographic examination of W6Mo5Cr4V2 and W18Cr4V steel needle valve.
2 Normative References
The following documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendment) applies.
GB/T 3077 Alloy Structure Steels
GB/T 5264 Plunger of Diesel Fuel Injection Pump - Specifications
GB/T 5771 Delivery Valve of Diesel Fuel Injection Pump - Specifications
GB/T 5772 Injector Nozzle of Diesel - Specifications
GB/T 18254 High-carbon Chromium Bearing Steel
YB/T 5302 Steel Wire for High-speed Tool
3 Metallographic Examination of GCr15 Steel Precision Coupled Parts