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我厂某产品的45钢大齿圈(φ800mm),厚度为50mm),在进行调质处理时,多批出现硬度偏低(15～30HRC)且大多数点<24HRC,离散度很大的问题,造成大齿圈成批报废.通过质量分析,弄清了原因,采取相应的改进措施后,保证了产品质量.1.对原材料成分的化学分析经分析,钢的化学成分为(%):0.470C、0.347Si、0.674Mn、0.012P、0.042S,此结果完全符合45钢的标准化学成分.2.对原材料的金相分析经分析,原材料基体为铁素体和珠光体组织,其中珠光体占57%左右,没有发现带状组
45 steel gear ring (φ800mm) of a product of our factory, the thickness is 50mm), there are many batches of low hardness (15 ~ 30HRC) and most points <24HRC, the problem of large dispersion , Resulting in the mass of gear ring scrapped.Quality analysis, to clarify the reasons, to take the appropriate improvement measures to ensure product quality.Analysis of the chemical composition of raw materials After analysis, the chemical composition of steel (%): 0.470C, 0.347Si, 0.674Mn, 0.012P, 0.042S, the results are in full compliance with the standard chemical composition of 45 steel.2. Metallographic analysis of the raw materialsAnalysis of raw materials for the ferrite and pearlite matrix, in which pearl Body accounted for about 57%, no band group was found