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一引言1963年我厂订购300多个用锡青铜材料制作的大钢瓶氧气中压阀门,经现场水压试验有85%泄漏,15%渗漏,直接影响产品质量,造成一定的经济损失。1964年初我们开始进行试验研究,从分析锡青铜的金相图中,得知锡青铜结晶温度范围较大,流动性较差,铸造时便形成分散分布的微缩孔,这样的铸件自然承受不了58.84 MP_(?) 以上的水压强度试验。试验证明钢制阀门则无此弊端,从分析铁-碳平衡图并与锡青铜金相图比较,得知二者液固相线间距差别甚大,从而启发
I. INTRODUCTION In 1963, our factory ordered more than 300 large oxygen steel medium pressure valve made of bronze material, 85% leakage and 15% leakage in the field hydraulic pressure test directly affected the product quality and caused some economic losses. In the beginning of 1964, we started to carry out experimental research. From the analysis of bronze metallographic picture of tin bronze, we know that the temperature range of tin bronze is larger and the fluidity is worse, and the micro-shrinkage holes are formed when casting, so the castings naturally can not afford 58.84 MP_ (?) Above the hydraulic pressure test. The test proves that the steel valve has no such drawbacks. From the analysis of the iron-carbon balance diagram and comparison with the tin bronze metallographic figure, it is found that there is a great difference between the liquid-solid phase spacing of the two, thus inspiring