Mid kasta oo iyaga ka mid ah waxa uu leeyahay kala duwanaansho dhismeed. Qaybahani waxay ka kooban yihiin nikkel, chromium, molybdenum alloy oo leh 50% nikkel 14% chromium, 15% molybdenum iyo carbon, manganese, silicon, sulfur, cobalt, iron iyo fosfooraska oo ka kooban.