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我们对球墨铸铁件的要求是抗拉强度不低于40公斤/公厘2;延伸率不低于6%;最大弯曲度不少于4公厘。但过去生产的铸件只满足了抗拉强度而没有考虑到延伸率。以第一炉铸件为代表我们过去熔化浇注球墨铸铁的过程大致如下:配料:本溪生铁68公斤,配合比8O%;废钢(碳钢)17公斤,配合比20%;75%矽铁1．5公斤;三、七镁铜合金1．5公斤(每75公斤铁水的加入量)。熔化操作的顺序如下:1．
Our requirements for ductile iron castings are tensile strength of not less than 40 kg / mm 2; elongation of not less than 6%; and maximum curl of not less than 4 mm. However, castings produced in the past only satisfy the tensile strength without considering the elongation. The first furnace castings represent our past melting cast ductile iron process is as follows: Ingredients: Benxi pig iron 68 kg, with the ratio of 8O%; scrap (carbon steel) 17 kg, with a ratio of 20%; 75% Kg; three, seven magnesium alloy 1.5 kg (75 kg of molten iron added). The sequence of melting operations is as follows: 1.