Gaggautsa zafin zafin jiki bisa madaidaicin bututu ana iya raba shi zuwa ƙananan zafin jiki mai ƙarfi.

Bayan tempering brittleness ainihin tube gami karfe quenched martensite a zazzabi kewayon 250 ~ 400 ℃ tempered karfe embrittlement wanda gaggautsa ductile mika mulki zafin jiki ya karu sosai. Yana faruwa yafi a cikin karfe gami tsarin karfe da low-alloy high ƙarfi daidaici bututu. Tuni bututun da suka karye daidai gwargwado shine karaya ta tsaka-tsakin tsaka-tsaki ko tsage-tsalle da karaya gauraye. Sanadin tashin hankali, yawanci ana la'akari da su: (1) da siminti yayin daɗaɗɗen takarda a cikin iyakoki na asali na austenite, haifar da ƙwanƙwasa iyakokin hatsi suna da alaƙa da alaƙa. (2) abubuwa masu ƙazanta irin su phosphorus a cikin rarrabuwar kan iyakokin hatsin austenite shima yana ɗaya daga cikin dalilan da ke haifar da rashin ƙarfi. Phosphorus kasa da 0.005% high tsarki madaidaicin bututu ba sa haifar da ƙarancin zafin jiki. Phosphorus yana faruwa a cikin iyakokin hatsi na austenite lokacin da aka kiyaye rarrabuwar wutar da ke bayan kashewa. Phosphorus a austenite hatsi iyaka segregation da siminti a lokacin tempering a cikin tsohon austenite hatsi iyakoki, wadannan abubuwa biyu haifar da intergranular gaggautsa karaya, da gudummawar da tempering brittleness faruwa.

Madaidaicin bututu alloying abubuwa suna da tasiri mafi girma a kan ƙarancin zafin jiki mai zafi. Chromium da manganese suna haɓaka rarrabuwar abubuwa masu ƙazanta irin su phosphorus a cikin iyakokin hatsi na Austenite, don haka suna ba da gudummawa ga gaɓoɓin zafin jiki, tungsten da vanadium da gaske ba su da wani tasiri, molybdenum yana lalata taurin juzu'in canjin yanayin zafin jiki na madaidaicin bututu, amma bai isa ba hana tempering brittleness. . Lokacin da silicon na iya jinkirta hazo mai zafi da siminti, wanda ke haifar da karuwar zafin jiki, yana yiwuwa a inganta madaidaicin bututun zafin zafin da ya faru.