Darelloy B-3 waa nickel-molybdenum alloy oo leh caabbinta aadka u fiican ee ku-meel-gaarka ah, shidaalka, iyo isbadalka walaaca-carrabka oo lagu daray, xasilloonida kuleylka ayaa ka sarreeya alloy B-2. Intaa waxaa sii dheer, nickel bir ah oo niktel ah waxay leedahay iska caabbinta weyn ee khadka mindida iyo guuska aagga kuleylka.