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直径300—1000公厘,重量在150—1000公斤的各种气动机器(如蒸汽机、空气压缩机等)的铸铁活塞(图1),必须用致密而坚实的铸铁制造,硬度在布氏180－229之间,
Cast iron pistons (Figure 1) of various pneumatic machines (eg steam engine, air compressor, etc.) with a diameter of 300-1000 mm and a weight of 150-1000 kg must be made of dense and solid cast iron with a hardness of 180- 229 between