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valve parts
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MATERIAL :
Grey iron:HT200、HT250、HT300、HT350。
Ductile iron:  QT400-15、QT450-10、QT500-7
ASTM A 216 WCB,WCC,LCC,LCB,CF8M,CF8,CD4MCU........
pressure test or ultrasonic,x-ray ,material element inspection by spectrometer
 
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