GB/T 7216-2009 Translated English of Chinese Standard. (GBT 7216-2009, GB/T7216-2009, GBT7216-2009): Metallographic test for gray cast iron
https://www.chinesestandard.net, 22.1.2016 - 25 sivua
This Standard specifies the evaluation method of gray cast iron microstructure under optical microscope.
Inspection items and evaluation figures
austenite grain decomposition Binary phosphorus eutectic blocky carbides Carbide number comparing with standard corresponding evaluation figures Delete directionally distributed distributed on iron E-type eroded by 2%~5 eutectic and huge eutectic carbide composite Eutectic number 4.5.1 Evaluate according F-type graphite field figures figures by comparing grain decomposition product Granules of austenite graphite and successively graphite distribution shape Graphite length graphite’s length picture gray cast iron huge and straight Inspect graphite inspect the percentage Magnification is 100 measured visual fields metallographic sample Microstructure nital non-directionally distributed number Grade Name number is divided Pearlite 50 Pearlite 90 Pearlite 95 Pearlite number phosphorus eutectic carbide phosphorus eutectic Granules Phosphorus eutectic number Phosphorus eutectic type plane under inspection previous standard provisions are shown provisions in GB/T sample in polishing shape of graphite shown in Table standard evaluation figures star or spider-like straight flake graphite Ternary phosphorus eutectic test for gray Test report three longest graphite