Gabatarwar samfur:
Alloy seamless karfe bututu wani nau'i ne na bututun karfe maras sumul, aikin sa ya fi na bututun karfe na gaba daya, saboda irin wannan bututun karfe yana dauke da kwatancen Cr.
Mutane da yawa, da high zafin jiki juriya, low zafin jiki juriya, lalata juriya yi ba m da sauran sumul karfe bututu, don haka gami bututu a cikin man fetur, sinadaran masana'antu, wutar lantarki, tukunyar jirgi da sauran masana'antu ana amfani da ko'ina.
Alloy sumul karfe bututu ƙunshi abubuwa kamar silicon, manganese, chromium, nickel, molybdenum, tungsten, vanadium, titanium, niobium, zirconium, cobalt, aluminum, jan karfe, boron, rare kasa da sauransu.