... trailers, vans, and other vehicles gray casting iron standard:1.HT250, HT300-china -automotive gray iron casting2. ... automotive gray iron casting9.G3000B, G3500b-ASTMA-159-standard specification for automotive gray iron castingtechnical processing:1. ... fine lathed (cnc)7.inspection (tensile strength test, hardness test, tri-ordinate measuring test, spectral analysis, Metallographic analysis, etc.)8 ...