Standard bhora mabhengi simbi ine zviri mukati kabhoni uye chromium yakasarudzwa uye yakaomeswa kuti imirire kumanikidza kwakanyanya pakati pechinhu chinomonereka uye mhete dzekubereka.
Carbonitriding pamarin'i emukati neekunze inzira yekuomesera vazhinji veTPI bhora rekutengesa. Kuburikidza neiyi yakakosha kurapwa kwekupisa, kuoma pamusoro pemujaho wepamusoro kunowedzera; izvo zvinoderedza kupfeka zvinoenderana.
Ultra-yakachena simbi inowanikwa mune imwe TPI yakajairwa bhora mabheji 'chigadzirwa chakateerana, yakakwirira kupfeka-kupokana kunowanikwa zvinoenderana. Sezvo kuneta kwekusangana kunowanzo kukonzerwa nekuoma kusiri-metallic inclusions, mabheji mazuva ano anoda mwero wakasiyana wehutsanana.