In our Country, where there is few Massive iron ore, it is very important to utilze iron sand; and some people are having interest to investigate them, but no experimental report which succeeded industrially are received. The most advantogeous method to treat iron sand is to make spongy iron, and Tokiwa Co. succeeded. in some degree in this process at Kuji recently.
Kuji Steel Works held Anderson-Thornhill process. First dried iron sand is reduced at low temp. (1, 000°C) and then is magnetically separated and at last briquetted.
We made spongy iron and then made steel using this spongy iron in an Electric furn ace. Composition of this spongy iron was total Fe 80%; reduced Fe 56% and TiO2 15%.
When 1/3 of total charge, there is no obstruction, but exceeding this 1/3 many obstacles were found and We must put out almost all of slag, and add limestone. For these reason working time becomes long. So expence per 1 ton is increased. Then from our experiment, it is seemed tbat this is no profitable industrially unless the cost of ore containing 85% of reduced iron is ¥2600 per 1 ton and the cost of electric power is 1 sen per 1 K.W.H.

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The present experiment was carried out for finding the change of solubility of iron and steel in acid, caused by cold-working. The specimens to be tested were previously strained by means of tensile, torsional, impact and compression tests and then they were subjected to the action of one percent sulphuric acid and the loss in weight determined after 72 hours. All the results dealt with in the present experiment led to the conclusion that specimens deformed by stress beyond the elastic limit showed a measurable difference of solubility and the greater the strain, the greater was the corrodibility.

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The present work shows the result of research regarding the solid carburisers as follows,
1. Composition and volume of evolving gas from solid carburisers when heated up to high temperature.
2. Comparison between carburising powers of various solid carburisers.
The author has reached the following conclusion,
1. The evolving gases from solid carburisers contain a large quantity of Hydrogen and hydro carbon at primary heating, but they are replaced by carbon-oxygen gases at secondary and afterward heating.
2. Ratio between CO to CO₂ and H₂ to CH₄ gases, evolved at high temperature, agrees with the equilibrium systems of Boudouard Rhead and Wheeler, and Schenk.
3. Carbonate as energisers, accelerates the carburised action at such a low temperature as it does not decompose, but de composed carbonate can not accelerate so strongly as undecomposed carbonate.
Then, carburiser mixed with carbonate, decomposed temperature of which is very high, does not decrease rapidly the carbuising power after repeated cabrurisations.
4. The carburisation mechanism of the solid carburiser must agree with the theory of CO-CO₂ Fe, hut it must be in more powerful coudition on account of the presence of great many quantity of solid carbon.

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