To provide such a corrosionproof technique of the inner surface cover of piping of a coke oven gas as is more efficient and more inexpensive than the flake-lining or the like in the conventional technique. 従来技術のフレークライニング等より有効で且つ安価なコークス炉ガス配管内面の防食技術を提供する。 - 特許庁