METHOD FOR PREVENTING HIGH TEMPERATURE OXIDATION CORROSION OF STEEL DUCT

To prevent the high temperature oxidation corrosion of a steel duct in which fluid flowing along the inside surface is high temperature gas, and which is used under an environment having a high temperature change and is exposed to high temperature oxidation corrosion environment.SOLUTION: A method f...

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Bibliographische Detailangaben
Hauptverfasser:	TANEMURA KAZUTERU, KATSUYAMA MASAKI, KATO KOHEI
Format:	Patent
Sprache:	eng ; jpn
Schlagworte:	BLASTING CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS,IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KINDOF FURNACE DIFFUSION TREATMENT OF METALLIC MATERIAL FURNACES HEATING INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL KILNS LIGHTING MECHANICAL ENGINEERING METALLURGY MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLICMATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASSC23 AND AT LEAST ONEPROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25 NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE OVENS RETORTS WEAPONS
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Beschreibung
Zusammenfassung:	To prevent the high temperature oxidation corrosion of a steel duct in which fluid flowing along the inside surface is high temperature gas, and which is used under an environment having a high temperature change and is exposed to high temperature oxidation corrosion environment.SOLUTION: A method for preventing high temperature oxidation corrosion of a steel duct according to the present invention is a method for preventing high temperature oxidation corrosion of a steel duct in which fluid flowing along the inside surface is high temperature gas of 500°C or higher, and which is exposed to a high temperature oxidation corrosion environment, wherein high temperature oxidation suppression gas is made to flow along the inside surface of the steel duct to suppress the high temperature oxidation corrosion of the steel duct. At this time, it is preferable that the inside surface temperature of the steel duct is reduced to 450°C or lower, and the high temperature oxidation suppression gas is an oxygen-free gas or a gas having an oxygen gas content of 1.0 vol.% or lower.SELECTED DRAWING: Figure 4 【課題】内面を流れる流体が高温ガスであり、温度変化の大きい環境下で使用され、高温酸化腐食環境に晒される鋼製ダクトの高温酸化腐食を防止する。【解決手段】本発明に係る鋼製ダクトの高温酸化腐食防止方法は、内面を流れる流体が５００℃以上の高温ガスであり、高温酸化腐食環境に晒される鋼製ダクトの高温酸化腐食防止方法であって、前記鋼製ダクトの内面に高温酸化抑制ガスを流入させ、前記鋼製ダクトの高温酸化腐食を抑制する。その際に、前記高温酸化抑制ガスにより、前記鋼製ダクトの内面温度を４５０℃以下に低下すること、及び、前記高温酸化抑制ガスが、酸素ガスを含有しないガス、または、酸素ガス含有量が１．０体積％以下のガスであることが好ましい。【選択図】図４