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We require on Annual Basis around 40000-80000mtrs by size & description as follows:Double wall copper brazed steel tube 7.96mm*0.71mm-Olive drab chromate passivation upto 25 microns.Tensile *****30kg/sq mm(290MPa)Yield ***** 18kg/sqmm(175Mpa)Elongation(50.8mm) 25% bundy tube, double wall, steel tube double wall copper brazed steel tube