Kuponya mchengaopangidwa ndi chitsulo chotuwa ndi chotsika mtengo kwambiri chifukwa chitsulo chotuwiracho ndi chotsika mtengo komanso kuponya mchenga kumatha kufikika pamapangidwe osinthika.Gray cast iron(yomwe imatchedwanso chitsulo cha grey cast) ndi gulu la chitsulo chosungunuka kuphatikiza mitundu ingapo ya kalasi molingana ndi katchulidwe kosiyanasiyana kosiyanasiyana. Grey cast iron ndi mtundu wa iron-carbon alloy ndipo amatchedwa "imvi" chifukwa chakuti zigawo zawo zodulira zimawoneka zotuwa. Mapangidwe a metallographic a imvi kuponyedwa chitsulo makamaka amapangidwa ndi flake graphite, zitsulo masanjidwewo ndi tirigu malire eutectic. Panthawi yachitsulo chotuwa, Carbon ili mu flake graphite. Monga imodzi mwazitsulo zoponyera zomwe zimagwiritsidwa ntchito kwambiri, chitsulo chotuwira chimakhala ndi zopindulitsa zambiri pamtengo, kutayika ndi makina. Kupanga molingana ndi miyezo ya ASTM A48, A536; DIN 1691, 1693; ISO 185, 1083; EN 1561, 1563; DIN 1691, 1693; AS 1830, 1831; JIS, UNI, NF, BS, UNF, NBN, AS, SS, NS. Magulu azinthu kuphatikiza:
- ISO185: 100, 150, 200, 250, 300
- ASTM A48: NO.20, NO.25, NO.30, NO.35, NO.40, NO.45, NO.45
- DIN 1691: GG10, GG15, GG20, GG25, GG30
- EN 1561: EN-GJL-100, EN-GJL-150, EN-GJL-200, EN-GJL-250, EN-GJL-300
- BS 1452: 100, 150, 200, 250, 300
- AS 1830: T150, T220, T260, T300
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