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steel / iron welding tube for aluminum / copper / plastic film foil core 1. Our chemical composition ID C (%) Si (%) Mn (%) P (%) S (%) Cr (%) Al (%) Rem ¢75 ≤ 0.20 ≤ 0.35 ≤ 0.60 ≤ 0.40 ≤ 0.40 ¢76.2...