NF A49-643

Steel tubes. Round, square and rectangular steel tubes for ordinary uses, longitudinally pressure welded and cold formed from flat products. Dimensions. Technical delivery conditions.

Norme de tubes ronds, carrés ou rectangulaires soudés longitudinalement par pression, en acier au carbone, acier à dispersoïdes pour des utilisations dans diverses industries telles que : mécaniques, échafaudages préfabriqués, étais, meubles, cycles, automobiles, métallerie, etc.

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