【摘要】 研究了铁液化学成分对球墨铸铁管质量的影响,确定成分控制范围为:w(C)3.2%~3.3%,w(Si)1.95%~2.25%,w(Mn)<0.4%,w(P)<0.06%,w(S)<0.05%。由于铸管的主要缺陷是内壁有夹渣,对冲天炉铁液氧化原因进行了分析,并提出了一些预防措施,结果使铸管的伸长率由7%~11%提高到9%~14%、一次水压合格率从97.5%提高到99%。更多还原

【Abstract】 The influence of chemical composition of iron melt on the quality of ductile iron pipes was investigated. It was determined to adopt the control range of compos1tion as follows: w(C)of 3.2%~3.3%, w(Si)of 1.95%~2.25%, w(Mn)<0.4%, w(P)<0.06%, w(S)< 0.05%. Since the dross on inner wall was the main defect of the pipes, the oxidation reason the of cupola iron melt was analyzed, and some prevention measures were proposed. As a result, the elongation of cast pipes was increased from 7%~11% to 9%~14%, and the qualification rate of the first time hydraulic leakage test was also increased from 97.5% to 99%.更多还原