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研究了两种炉前测定蠕墨铸铁蠕化率的方法。第一种方法是共晶膨胀力——热分析法,第二种方法是粘土砂样杯法。 共晶膨胀力—热分析法用φ30×250mm的试样,在北京钢院BL—Ⅱ型共晶膨胀力测定仪上用干型浇注。记录其共晶膨胀力——时间曲线,并记录温度—时间曲线。根据两曲线上的特征值代入计算公式中,即可求出蠕化率级别。测定时间在3分钟以内,确报
Two methods for the determination of vermicular cast iron creep rate before furnace were studied. The first method is eutectic expansive force - thermal analysis method, the second method is clay sand cup method. Eutectic Expansion Force - thermal analysis method with φ30 × 250mm sample, Beijing Institute of BL-Ⅱ eutectic expansion force measuring instrument with dry pouring. Record its eutectic expansion force - time curve, and record the temperature - time curve. According to the two curves on the eigenvalue into the formula, you can find the level of vermicularity. Determination of time within 3 minutes, indeed reported