1 after each ladle of molten iron is poured, it is necessary to insert the pre fabricated label (the number of the package which is engraved on it) into the pouring cup of the ladle casting to prevent the confusion of different packages。
2 each package of hot metal after the production of the tensile test rod blank, as a batch of inspection, mechanical properties, microstructure and hardness testing。
3 each ladle hot metal to be detected before the release temperature, control range 1400-1500.
4 after each ladle molten iron is finished, it is necessary to detect the temperature of molten iron, the control range is above 1360 degrees celsius。
5 the five elements of the original molten iron - 1 - to - 2 samples are tested daily to control the stability of the casting material and the recovery of the charge.
6 the casting time of each ladle is 10 minutes (after the spheroidizing reaction), and it will be scrapped。
7 when the sand, according to the number of plates were stacked, different packages can not be confused, waiting for the test results and test results.
Ductile cast iron manhole cover after passing the test results of mechanical properties, promptly notify the workshop cleaning. If the unqualified packages are found, they shall be scrapped one by one according to the number of the signs.
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