Xa kuthelekiswa neintsimbi eqhelekileyo, insimbi ekhethekileyo inamandla aphezulu kunye nokuqina, iipropati zomzimba, iikhemikhali, i-biocompatibility kunye nokusebenza kwenkqubo. Kodwa intsimbi ekhethekileyo ineempawu ezahlukileyo kwintsimbi eqhelekileyo. Kubaintsimbi eqhelekileyoabantu abaninzi baqonda ngakumbi, kodwa kwiimpawu zeintsimbi ekhethekileyo, abantu abaninzi bathi babhideke ngakumbi. Ngoko ke, inqaku elilandelayo ligxininisa kwiimpawu zeentsimbi ezikhethekileyo.
Iimpawu zentsimbi ekhethekileyo:
Xa kuthelekiswa neintsimbi eqhelekileyo, intsimbi ekhethekileyo ineempawu zokucoceka okuphezulu, ukufana okuphezulu, ukwakhiwa kwe-ultra-fine kunye nokuchaneka okuphezulu:
(1) Ubunyulu obuphakamileyo.Umxholo wegesi kunye nokufakwa (kubandakanywa ukufakwa kwesinyithi kunye nenqanaba eliphantsi lokunyibilika) kwintsimbi kunokuncitshiswa. Xa ukucoceka kwentsimbi kunyuswa kumda othile, kungekhona nje kuphela iimpawu zokuqala zetsimbi ezinokuthi ziphuculwe kakhulu, kodwa kunye neepropati ezintsha zetsimbi zinokunikwa. Ngokomzekelo, umxholo we-oksijini ekuthwaleni insimbi iyancipha ukusuka kwi-30 × 10-6 ukuya kwi-5 × 10-6, kwaye ubomi bokuthwala bunyuka ngamaxesha angama-30. I-Universal austenitic stainless steels ikhuselekile kwi-corrosion yoxinzelelo xa umxholo we-phosphorus uyancipha ukuya kwi-3 × 10-6. Ekupheleni kwekhulu lama-20, inqanaba lokucoceka (10) letsimbi elinokuthi liphunyezwe ngokuveliswa kobuninzi: i-hydrogen ≤1, i-oksijini ≤5, i-carbon ≤10, isulfure ≤10, i-nitrogen ≤15, i-phosphorus ≤25.

(2) Ukufana okuphezulu.Ukwahlula ukubunjwa kwensimbi kukhokelela kwisakhiwo esingalinganiyo kunye neepropati zensimbi, enye yezizathu ezibalulekileyo zokungaphumeleli kwangaphambili kweengxenye zetsimbi kunye nobunzima bokusebenzisa ngokupheleleyo iipropati ezinokuthi zenzeke. Ubuchwephesha bemveliso yanamhlanje kufuneka yenze ukufana kokufikelela kwentsimbi: ukuguquguquka kwebhendi yentsimbi yemoto yentsimbi yi ± 3HRC; Umxholo wekhabhoni, i-nickel, i-molybdenum ≤± 0.01%, kunye ne-manganese kunye ne-chromium ≤± 0.02% zilawulwa ngokuchanekileyo. Ubungakanani obuziinkozo bentsimbi yokuthwala emva kokucima bungqukuva kwaye ubungakanani bokuguquguquka yi-0.8± 0.2 μm. Iimpawu zomatshini zentsimbi exhathisayo yokukrazula i-laminated (i-Z-direction steel) kwi-longitudinal, i-transverse kunye nolwalathiso lobunzima, ngakumbi iimfuno zeplastiki kunye nokuqina zifana ngokubanzi.
(3) Ubume be-Ultra-fine.Ukuqiniswa kwe-Ultra-fine microstructure kuphela kwendlela yokomeleza enokunyusa amandla entsimbi ngaphandle kokunciphisa okanye ukwandisa kancinci ukuqina. Umzekelo, xa ubungakanani beenkozo zamandla aphezulu AFC77 yentsimbi icocwe ukusuka kwi-60μm ukuya kwi-2.3 μm, ukuqina kokwaphuka kwe-Kic kunyuka ukusuka kwi-100 ukuya kwi-220MPa · m. Iqondo lobushushu le-irradiated embrittlement yepleyiti yentsimbi erhabaxa-grained kwisitya soxinzelelo lwe-nuclear reactor yi-150 ~ 250℃ ngelixa intsimbi ecolekileyo iyi-50 ~ 70℃. Xa ubukhulu be-carbide kwintsimbi yokuthwala ilungile ukuya ku-≤0.5μm, ubomi obuthwele buya kuphuculwa kakhulu.
(4) Ukuchaneka okuphezulu.Iintsimbi ezikhethekileyo kufuneka zibe nomgangatho omhle womphezulu kunye nokunyamezela okuncinci. Ukuchaneka kwentonga yentsimbi eshushu ukuya kuthi ga kwi-± 0.1mm, ukunyamezelwa kobunzima bekhoyili yeshiti eshushu ukuya kuthi ga ku-±0.015 ~ 0.05mm, kunye nokunyamezelana kobunzima bekhoyili yeshiti epholileyo ukuya kuthi ga ku-± 0.003mm.