1957 Volume 43 Issue 5 Pages 569-574
One may find in the various literatures and data, etc. the theories stating the influence which the gas composition in cast iron gives to its quality, the fact of which is too obvious to require any argument. But the results stated in the above data are quite different, lacking unity of method of determination for cast iron in comparison with the case of steel.
The authors made examination about the sampling method and, at the same time, compared and examined the 900°C vacuum-heating method with the vacuum-fusion method of carbon spiral type. And the following conclusions were found.
1) Regarding the H2 analysis value, the data of the vacuum-fusion method mostly showed higher value and was more accurate than that of the vacuum heating method.
2) Also, in case of cast iron, the exhaust of gas from specimen was recognized at the room temperature. By holding the gas catcher using mercury under the condition of about 95°C temp, it was possible to complete catching for about 1/120 hours as compared with the case of leaving it at the room temperature alone.
3) In case of the metal moulding, 10mmφ mould was the best.
4) Instead of method of the metal moulding and mercury cooling the author tried and examined the method of silica tube suction and outside-running-water cooling and found that the latter was more simple, sanitary and economical. The silica tube having inside dia. of 8mmφ was the best. And the opaque will do, too.