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新晃水泵厂1986年生产东方红-75型履带板,是“以球代钢”,采用QT 60-2球铁生产的。采用低碳奥氏体化正火加部分球化回火来提高履带板综合机械性能,效果较为显著。现(?)这一工艺进行如下分析。一、低碳奥氏体化正火根据Fe-C-Si三元相图特点,由于球铁Si含量为2.0～2.％,加上其它化学元素的影响,共析转变温度范围为750～820℃,低温石墨化退火可在750℃左右进行。在760℃保温1h可使球铁基体完全铁素体化。由于相图中E、S
Shinkansen pump factory in 1986 to produce Dongfanghong -75-type track shoes, is “to the ball on behalf of steel”, the use of QT 60-2 ductile iron production. The use of low-carbon austenitizing normalizing plus partial ball tempering to improve overall mechanical properties of the track shoe, the effect is more significant. Now (?) This process for the following analysis. First, the low-carbon austenitizing normalizing Fe-C-Si ternary phase diagram according to the characteristics of the ductile iron content of 2.0 to 2.%, coupled with the impact of other chemical elements, eutectoid transformation temperature range of 750 ~ 820 ℃, low temperature graphitization annealing can be carried out at about 750 ℃. Insulation at 760 ℃ for 1h can make the ductile iron matrix completely ferrite. As the phase diagram E, S