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EN 10025-6 S550QL 1.8926 high strength steel box section Content EN10025-6 S550QL 1.8926 steel hexagonal bar EN 10025-6 S550QL 1.8926 jis high-strength steel flanged hex head screws EN 10025-6 S550QL 1.8926 high strength steel beams EN 10025-6 S550QL 1.8926 high