美国牌号为灰铸铁的标准是ASTM A48/A48M，其中等级（Class）为NO.40的灰铸铁相当于中国的HT250和HT300之间。参考资料：《ASTM A48/A48M-00》；《金属材料及制品中外牌号对照》
MECHANICAL PROPERTIES OF CASTINGS X1.1 The mechanical properties of iron castings are infl u- enced by the cooling rate during and after solidifi cation, by chemical composition (particularly carbon equivalent), by the design of the casting, by the design and nature of the mold, by the ...
ClassCarbon Content EquivalentCarbon min I3 81 4 403 50 II3 51 4 103 20 III3 20 3 802 80 TABLE 2 Variations in Carbon and Silicon Contents ClassCarbon Silicon I3 500 90 2 70 3 700 90 2 10 3 900 90 1 50 II3 200 90 2 70 3 400 90 2 10 3 501 80 max III2 801 20 2 70 ...