论文部分内容阅读
球墨铸铁用铝合金化可以大大提高冲击韧性、热稳定性和抗氧化性,因而可提高球墨铸铁钢锭模的使用寿命。苏联北方钢管厂对生产无缝钢管用钢的钢锭模进行了使用试验其中选择了八个炉号球墨铸铁钢锭模做化学成分与球化率的试验,实际成分见下表(％): 铸铁的成分为0.51～1.60％A1,1.70～1.80％Si,0.065～0.110％Mg(熔炼号1～3)。球状石墨(球化率)为85～100％。含硅量降低到1.02～1.39％(熔炼号4～6),球化率基本不变,但出现了自由渗碳体。当含铝量大于0.8％时,尽管残余含镁量很高,而球化率却显著降低(熔炼号7～8)。另外,又用六个炉号球墨铸铁钢锭模的试样做了有关性能方面的试验。试验结果,成分中含1.02～1.86％Si和0.44～0.60％A1的钢锭模具有
Ductile iron aluminum alloy can greatly improve the impact toughness, thermal stability and oxidation resistance, which can improve ductile iron ingot mold life. The Soviet Union Northern Pipe Plant on the production of seamless steel pipe steel ingot mold for the use of tests were selected eight heat number of ductile iron ingot mold chemical composition and the rate of ball test, the actual composition of the following table (%): cast iron Compositions were 0.51 to 1.60% A1, 1.70 to 1.80% Si and 0.065 to 0.110% Mg (Melts 1 to 3). Spherical graphite (spheroidization rate) is 85 to 100%. Silicon content decreased to 1.02 to 1.39% (smelters No. 4 to 6), the ball rate remained essentially the same, but the emergence of free cementite. When the aluminum content is more than 0.8%, the spheroidization rate is significantly reduced despite the high residual magnesium content (smelters 7-8). In addition, with the six heat number of ductile iron ingot mold samples made the performance of the test. As a result, the steel ingot mold containing 1.02 to 1.86% of Si and 0.44 to 0.60% of Al in the composition has