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60x60 Square steel pipe tube 80x80 steel square tube for construction Specification Standard ASTM A182-2001, JIS G3454-2007 Grade Cr5Mo, 12CR2MO, 34CrMo4, Cr5MoG, Cr17Ni8, 1Cr13Mn9Ni1N, 15MnV, 09Mn2V, ...