Abstract: An improved apparatus for treating waste water containing volatile and corrosive substances by steam-stripping to remove the volatile and corrosive substances from the waste water. The apparatus has a liquid pooling zone installed at a part over the waste water supplying part of a stripper tower and liquid distributor at the top of the tower, and pipe arrangement is prepared to recycle liquid drawn from the liquid pooling zone to the liquid distributor. In the pipe arrangement, a cooler for the recycling liquid is installed. Serious corrosion can be avoided utilizing this apparatus.

Abstract: The surface of an apparatus made of a Fe base alloy or Ni base alloy containing at least 35 wt. % of Cr is resistant to carbon deposition when the apparatus contacts carburizing/oxidizing atmospheres.

Abstract: A carbon deposition preventive double-layered tube for handling carbon compounds at not less than 500.degree. C., the double-layered tube comprising:(a) the layer to be exposed to the carbon compounds, constructed from an alloy which is composed of Cr, Ni, and Fe in porportions shown within a triangular region I of an equilibrium diagram (FIG.

Abstract: An apparatus for treating carbon containing compounds such as hydrocarbons or their derivatives, or carbon monoxide or the like at temperatures higher than 500.degree. C., wherein at least a member contacting with said carbon containing compounds at temperatures higher than 500.degree. C. is composed of any one of Fe base, Ni base and Co base alloys or their mixed Fe-Ni, Fe-Co, Ni-Co and Fe-Ni-Co alloys, each containing at least 28 wt.% of Cr, and this member can exhibit a superior resistance to carbon deposition.

Abstract: A method for preventing the corrosion and hydrogen embrittlement of equipment made of tantalum handling therein hot concentrated sulphuric acid at 200.degree. C. or higher, characterized in that at least one oxidizer selected from the group consisting of nitric acid, nitrogen oxides, ferric ion, cupric ion, stannic ion or plumbic ion is incorporated in the sulphuric acid.

Abstract: A stainless cast alloy steel suitable for ground joint portions, airtight portions, sliding portions, etc., used at low temperatures comprising: from about 0.03 to about 0.15% by weight of C; up to about 2% by weight of Si; up to about 2% by weight of Mn; from about 18 to about 26% by weight of Cr; from about 5 to about 13% by weight of Ni, the remainder being Fe and unavoidable trace impurities; wherein a ferrite phase is present in an amount of from about 10 to about 40% by volume, based on the volume of the stainless cast alloy steel.