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壁厚为5—40mm壳体件中的球状石墨是在型内用含4．5—6%Mg的无钙中间合金变质得到的。用粉碎成1—10mm的部分变质剂和大部分中间合金揽拌,以稳定其中的Mg、Si含量。这样制备后,得到的中间合金含5-5．3%Mg和54-56%Si。准备好的中间合金放入下型沿浇注系统流程设置的反应室内。在酸性炉衬的6号电弧炉内熔炼铁水,随后在感应加热的保温包内均匀化学成分。在1380~1420℃时,用成分,(%) 3．4-3．6C,2．2—2．4Si、0．2—0．5Mn、＜0．15Cr、＜0．1P、＜0．03S的铁水浇注成型。
Spherical graphite in a wall thickness of 5-40 mm in a shell piece is obtained by modifying a calcium-free master alloy containing 4.5-6% Mg in the pattern. With crushed into 1-10mm part of the modifier and most of the master alloy Lan mix to stabilize the Mg, Si content. After this preparation, the resulting master alloy contains 5-5.3% Mg and 54-56% Si. The prepared master alloy is placed in the reaction chamber provided along the pouring system flow. Hot metal was melted in a No. 6 EAF with an acidic lining, followed by chemical homogenization in an induction-heated insulation package. (%) 3.4-3.6C, 2.2-2.4Si, 0.2-0.5Mn, <0.15Cr, <0.1P, <0 at 1380-1420 degreeC. 03S cast iron molding.