Refinery Flare Stack Alloy Steel Riser Pipe
High-temperature alloy steel longitudinally welded pipe >16" for flare stack risers in oil refineries. HTS 7305.31.60: other large welded alloy circular. 5Cr-0.5Mo grade.
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Import Tips & Compliance
• API 530 certs for creep strength
• Specify no refractory lining
• Sections w/flanges → 7307 risk
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