... ,GOST,JIS,DIN,ASTM standard ISO9001:2008 Certificate Material:gray iron,ductile iron,steel OEM is ok sand casting tractor parts1)Material ... :grey iron,ductile iron by vacuum casting,sand casting,lost foam casting and CNC ... to each bulkSend the photos and test data of each step to customers4. Machining process controlProduce the samples according to the ...