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我厂生产的进、排气摇臂,以往是采用20号钢渗碳淬火。另件的技术要求:与顶杆接触处要耐磨(硬度R_c58～60),心部要有韧性。自去年大跃进以后,钢材供应紧张,特别是今年第二季度开始,更为紧张,要实现跃进计划就必然要用旁的材料来代用。以铁代钢是最好的措施。但普通灰铸铁达不到上述要求,唯一的办法是采用球墨铸铁。为了使球墨铸铁摇臂另件能符合锻钢的技术要求,作了下列的热处理试验:一高温退火球墨铸铁摇臂铸件的配料,与我厂原生产的四缸柴油机曲轴相同,化学成份为碳3.0～3.3％,
I plant into the exhaust rocker, the past is the use of 20 steel carburizing quenching. Another piece of the technical requirements: Contact with the mandrel to wear (hardness R_c58 ~ 60), the heart must be toughness. Since last year’s Great Leap Forward, steel supply was tight, especially since the second quarter of this year. It was even more tense. To make a leap forward plan would inevitably have to be replaced by the materials used. Iron and steel is the best measure. But ordinary gray cast iron can not meet the above requirements, the only way is to use nodular cast iron. In order to ductile iron rocker pieces can meet the technical requirements for forged steel, made the following heat treatment test: a high-temperature annealing ductile iron rocker casting ingredients, and I plant the original production of four-cylinder diesel engine crankshaft the same chemical composition of carbon 3.0 to 3.3%