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我厂生产的L3.3-17/320氮氢气压缩机连杆采用QT40-10球墨铸铁制造。选用质量较好的本溪和邯郸生铁生产的连杆部件运转良好,无断裂现象。而采用苏州生铁生产的球铁连杆,脆性较严重。为找出脆断原因,从邯郸生铁和苏州生铁铸造的二批球铁连杆中各抽二根,于同一电炉中,按原热处理工艺进行退火处理,见下图。
L3.3-17 / 320 Nitrogen Hydrogen Compressor Connecting Rod of our factory is made of QT40-10 ductile iron. Selection of good quality Benxi and Handan pig iron rod produced parts running well, no fracture phenomenon. The use of Suzhou pig iron production of iron connecting rod, more serious brittleness. In order to find out the reason of brittle fracture, two pumps were cast from two batches of ductile iron rods cast from Handan pig iron and Suzhou pig iron respectively and annealed in the same electric furnace according to the original heat treatment process, as shown in the following figure.