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A309-16 2.0/2.5/3.2/4.0/5.0 mm Stainless Steel Electrodes Conform to Standard GB/T 983 E309-16 AWS A5.4 E309-16 ISO 3581-A-E(22 12) R 3 2 ISO 3581-B-ES 309-16 Specification:A302 is a, calcium-titanium ...