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生产铸态QT400~15铁素体球墨铸铁时,选用Mn≤0．40%、P≤0．06%、S≤0．04%、微量合金总量∑T<0．15%的生铁;采用75SiFe和含Bi、Ca、A1和RE的复合孕育剂;采用小剂量多次强化孕育和铁水过滤技术;用工频炉化铁,用XtMg5—8中间合金球化处理;成品Mn≤0．45%,Si=2．2~2．8%的情况下,基尔试块和铸件的铸态组织,铁素体在80%以上。球化级别,石墨大小在l~2级。电镜扫描断口形貌为石墨十韧窝(加少量准解理)。机械性能数理统计表示达到了DINGGG40球铁标准。V形缺口常,低温冲击值与IS0400—18相同。
Casting QT400 ~ 15 ferrite ductile iron, the choice of Mn ≤ 0.40%, P ≤ 0.06%, S ≤ 0.04%, the total amount of micro-alloy ΣT <0.15% of pig iron; 75SiFe and containing Bi, Ca, Al and RE composite inoculant; using low-dose multiple inoculation and hot metal filtration technology; with frequency furnace iron, with XtMg5-8 intermediate alloy spheroidization; finished Mn ≤ 0.45 %, Si = 2.2 ~ 2.8% of the case, the Kiln test blocks and castings as-cast structure, ferrite is more than 80%. Ball-level, graphite size l ~ 2 level. Electron microscopy fracture surface morphology ten ductile graphite (plus a small amount of quasi-cleavage). Mechanical properties of mathematical statistics that meet the DINGGG40 ductile iron standard. V-shaped gap often, low-temperature impact value and IS0400-18 the same.