Tosihiro Kinosita1, Torakiti Hara1
Regarding the determination of oxygen in the steel, the vacuum fusion method and the hydrogen reduction method are already will studied, and proved successful. But, until now, the chlorine method for the determination of oxides is not fully investigated, and hence the writers made a study of this method on carbon steel that
1. The chlorination is carried at 300°.
2. By passing through sugar charcoal heated at 800°, the effect of oxygen in the chlorine gas in removed.
3. The non-volatile residue is washed by hot water, 5% HCl solution and finally by 5% Na2CÓ3 solution, and then by gravimetric method, the various oxides are separated and determined.
By the procedure above described, the blank test about various metals and oxides were examined, and the effect of impurities such as S. P. C. etc. on the determined value was studied. The results are as follows:
1. FeO, Al2O3, SiO2 can be determined exactly.
2. MnO, determination is not satisfactory.
3. In the determination of S, P, and C, the loss of oxygen occurs, but it is very little.
4. The total oxygen by the chlorine method is much smaller than that by the hydrogen reduction
method, and it will agrees with that by the vacuum fusion method.
Lastly, after comparing the oxygen in the deposit metal of welding with those of the mechanical pro-perties, it is assured that the higher the oxygen content the worse the mechanical properties.
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