Bologs-ka-dhifyada, sida macbudka 600, 601,625,686,786,715 Boxtoors, waa qoys ka shaqeeya 'Nickel-chromium-molybdenum' oo loo isticmaalo xooggooda heerkulka sare iyo iska caabinta suuxdinta wanaagsan. Sababta oo ah xasilloonideeda kuleylka, ee sicir-bararka waxaa loo isticmaali karaa heerkulka adeegga ee u dhexeeya crygogenic ilaa 2200¡ãf (982¡ãC). Qeybta sare ee ka kooban astaamaha 'Infel' waxay u saamaxdaa inay ka hor tagto jawi ballaaran oo kala duwan oo ah jawiga jawiga daran.