Welded member and clean room
OwnerTadahiro Ohmiinventor
Life of this patent
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Abstract
A welded material composed of welded ferritic stainless steel in which the outermost surface of the welded part contains a chromium oxide surface containing no iron oxides.
Claims8
A welded member, characterized in that the outermost surface of a welded part at which ferritic stainless steels are welded together is a chromium oxide surface containing no iron oxides.
Piping, characterized in that an outermost surface of a welded part at which pipes comprising ferritic stainless steel are welded together is a chromium oxide surface containing no iron oxides.
A piping system, characterized in that pipes are employed in which the outermost surface of the welded part at which pipes comprising ferritic stainless steel are welded to one another is a chromium oxide surface containing no iron oxides.
A clean room, characterized in that gas supply pipes disposed therewithin comprise pipes in which the outermost surface of welded parts at which pipes comprising ferritic stainless steel are welded to one another is a chromium oxide surface containing no iron oxides.
Dependencies are inferred from the claim text.