കൂപ്പൺ ഉപയോഗിച്ച് 95% കിഴിവ് നേടുക
AISI-1020 steel coupons were used with about 1 cm 2 of the total surface. The chemical composition of the coupons consisted of C = 16%, Mn = 0.63%, P = 1.2%, S = 3.1%, Si = 1.2%, Cu = 1%, Cr = 3%, and Ni = 1%. The coupons were sanded using metal sandpaper, with progressive reduction of grain size, for complete cleaning of the cover material.
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