1. Cov ntsiab lus tseem ceeb
Raws li cov qauv txhais, st45.8 yog cov hlau tsis muaj roj av lossis cov hlau nrog cov leeg ua raws li cov tshuaj lom neeg:
Carbon (c): tsawg dua lossis sib npaug rau 0. 21 feem pua
Silicon (Si): {0. 10% - 0. 35/30%
Manganese (MN): {0. 4% -0. 8%
Phosphorus (p): tsawg dua lossis sib npaug rau 0. 02%
Sulphur (s): tsawg dua los yog sib npaug rau 0. 025%
Lwm cov khoom siv aloyoy (piv txwv li chromium, npib tsib, tooj, thiab lwm yam) tsis muaj daim ntawv cim npe kom meej thiab yuav muaj tsuas yog cov lus qhia xwb.
2. Micro-alloying cov ntsiab lus ntxiv
Qee cov yeeb nkab st45.8 cov yeeb nkab steel yuav ntxiv cov khoom siv vanadium, titanium, boron, feem ntau tsis dhau qhov muaj peev xwm ntawm cov hlau tsis muaj roj.
3. Cov Khoom Siv Hluav Taws Xob
St45.8 sib raug rau Suav Qib 20G (ob qho tib si muaj cov tshuaj sib thooj thiab cov uas tsim cov tshuaj tua hluav taws xob thiab cov niam txiv tsawg thiab cov tub ntxhais.
Lub ntsiab
Cov tshuaj lom neeg muaj pes tsawg leeg ntawm St45.8 raj yog raws cov roj carbon, thiab cov ntsiab lus ntawm cov txiv lws suav muaj tsawg, thiab cov raj hluav taws xob zoo siab rau cov roj hmab thiab lwm yam khoom siv hluav taws xob.
