球墨铸铁开始制造的时候,只是加入一些以镍镁为主要成分的合金,这些合金被继续利用着,但早就供不应求了.不但供应来不及而且这种方法成本相当贵,按理说镍只应当在产品需要高的强度和更大的硬度时才采用.因此前一时间,人们已经注意到其它可能的代用品 When the ductile iron began to be manufactured, only the addition of some nickel-magnesium alloy as the main components, these alloys continue to be used, but has long been in short supply. Not only the supply too late and the cost of this method is quite expensive, arguably nickel should only be in the product Need to use high strength and greater hardness.Therefore, the previous time, people have noticed that other possible substitutes