Heat resistant spheroidal graphite cast iron, method of manufacturing the same and engine exhaust system part including the same

• Main Authors: Shim, Dong-Seob, Yang, Sik, Ju, Young-Kyu, Chung, Jong-Kwon, Hwang, Jae-Hyoung, Kim, Sang-Beom, Jung, Ki-Hwan
• Format: Patent
• Language: English
• Published: 21.05.2019
• Subjects: ALLOYS; BASIC ELECTRIC ELEMENTS; BLASTING; CASTING; CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES; CHEMISTRY; ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS; ELECTRICITY; ENGINE PLANTS IN GENERAL; FERROUS OR NON-FERROUS ALLOYS; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; HEATING; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; LIGHTING; MACHINES OR ENGINES IN GENERAL; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; MEASURING; MECHANICAL ENGINEERING; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; PERFORMING OPERATIONS; PHYSICS; POWDER METALLURGY; PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL; STEAM ENGINES; TESTING; TRANSPORTING; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS; WEAPONS

Heat resistant spheroidal graphite cast iron having an improved high temperature tensile strength includes carbon (C) in a range of 3.2-3.4 wt %, silicon (Si) in a range of 4.3-4.8 wt %, manganese (Mn) in a range of 0.2-0.3 wt %, molybdenum (Mo) in a range of 0.8-1.0 wt %, vanadium (V) in a range of 0.4-0.6 wt %, chrome (Cr) in a range of 0.2-0.4 wt %, niobium (Nb) in a range of 0.2-0.4 wt %, inevitable impurities, and a remainder of iron (Fe) based on a total weight of the heat resistant spheroidal graphite cast iron. The heat resistant spheroidal graphite cast iron further includes barium (Ba) in a range of 0.0045-0.0075 wt %. A content ratio of chrome (Cr) and barium (Ba) (Cr/Ba) is in a range from about 26 to about 89.