Ally 20 Bolts ayaa laga sameeyay Nichrome oo leh 32.5% Nickel, 19% Chromium, kaarboon, naxaas, molysese, Minganese, Silicon, Columium iyo birta. Alloy 20 waa nickel-chromium-molimium-molybyebdenum stain aan sal lahayn oo loo sameeyay codsiyada ku lug leh aashitada sulfuric. Iska caabbinta ay iska caabbinta ayaa sidoo kale ka hela adeegsi kale kiimikada, cuntada, warshadaha dawooyinka iyo balaastigga. Alloy 20 waxay ka hortagtaa galka iyo shixnad koloriin ah, oo nuxurka naxaas ah wuxuu ka ilaaliyaa aashitada sulfuric. Alloy 20 ma aha SS, laakiin waa aloy (ASTM).