Thermal Analysis Carbon Cup for Casting Iron

Determination of thermal analysis stability of carbon cup and Instrument Adjustment

One: option of instrument and electric furnace

First, be sure to select the specific carbon silicon analyzer and hot metal within the specified test furnace. the replacement of components when the next test furnace hot metal will be change.

Two: data testing methods

Example: Thermal analysis of the test carbon cup should be 3 to 5 consecutive (arrange it according the time), e.g. the test result of Si% is 1.80%, 1.82%, 1.86%, 1.88%, 1.90%. Testing is completed record data.

Three: analysis

1）  Stability. According above testing result, the highest one is 1.80%, lowest one is 1.70%, fluctuation gap is 0.1, average value is 1.75% (±0.05).

2）  Instrument adjustment.

If the chemical analysis of Si% molten iron content was 1.85% when the original apparatus should be set based on the si values of 0.1 and then raised to complete the adjustment (if the former setting of Si is -0,2, should change at -0.1). when test again, the content of Si% will become 1.85%, the adjustment is over, can work now.

Four: attention

1）the hot metal temperature in the sample cup should not exceed 1350 ℃.

2）Optimum temperature of ductile iron is 1200 ℃ ~ 1250 ℃.

3）Optimum temperature of Gray Iron 250, 300 is 1250 ℃ ~ 1350 ℃

4）The abnormal situation like low carbon high silicon hot metal composition will cause instruments to measure the normal C% and Si% no data.