Tshuaj lom neeg muaj pes tsawg leeg & cov qib
Silicon-calcium alloys tau faib raws lawv ca, si, thiab impurity cov ntsiab lus:
| Teem nqi | CA (%) | SI (%) | C (%) | Al (%) | S (%) | P (%) |
|---|---|---|---|---|---|---|
| CASI 30 | 28-32 | 55-65 | Tsawg dua los yog sib npaug rau 0. 5 | Tsawg dua los yog sib npaug rau 1.5 | Tsawg dua los yog sib npaug rau 0. 04 | Tsawg dua los yog sib npaug rau 0. 04 |
| Casi 20 | 20-25 | 60-65 | Tsawg dua los yog sib npaug rau 0. 8 | Tsawg dua los yog sib npaug rau 2. 0 | Tsawg dua los yog sib npaug rau 0. 05 | Tsawg dua los yog sib npaug rau 0. 05 |
| Low-c casi | 30-32 | 58-62 | Tsawg dua los yog sib npaug rau 0. 1 | Tsawg dua los yog sib npaug rau 1. 0 | Tsawg dua los yog sib npaug rau 0. 03 | Tsawg dua los yog sib npaug rau 0. 03 |
High-calcium (Casi 30) nyiam rau kev tswj tus deoxidation sib sib zog nqus thiab kev suav nrog cov qib siab steel.
Txheem (Casi 20): Siv rau hauv cov hlau loj thiab cov hlau cam khwb cia.
Tsawg-carbon (Low-C Casi): Qhov tseem ceeb rau cov hlau roj Ultra (piv txwv li cov hlau hluav taws xob, cov ntawv txheeb xyuas tsheb).
Cov txheej txheem ntau lawm ntawm silicon calcium
Silicon-calcium yog tsim los ntawm carbothermic txo nyob rau hauv submerged Arc rauv (Saf):
Cov khoom siv raw: Quartz (sitio₂), txiv qaub (cao), thiab carbonaceous reductants (thee, coke).
SMELTING:
Cov tshuaj tiv thaiv: Sio₂ + CAO + C → Casi + CO (roj)
Kub: 1600-1800 degree
Refining & Casting: Molten Alloy yog kho kom txo cov impurities thiab nrum rau hauv kev cuam tshuam lossis granules.
Kev sib tsoo & SIZING: Thaum kawg cov khoom lag luam yog crushed rau hauv paus me me loj (1-50mm).
Qhov tseem ceeb mellurgical functions
(1) cov ntawv thov steelmaking
Deoxidation:
CA + O CAO (SLAG INCLUCUS Tshem)
Ntau dua li FESI lossis ib qho vim muaj zog tsim oxide.
Desulfurization:
CA + S → CAS CAS (tshem cov leej faj, txhim kho Ductility)
Cov muaj kev hloov kho:
Hloov cov teeb meem al₂o₃ suav nrog rau hauv spherical calcium alhaium alhaium aluminium altain, kom haum machinations.
(2) cam khwb cia hlau hloov
Graphite nodularization:
CA (nrog mg) pab ua daim ntawv spheroidal hauv cov hlau ductab.
Txo cov txiv ntsawj txias: Txhim kho cov xim ua kom zoo nkauj thiab txo cov carbide tsim.
(3) txhuas kho kom zoo nkauj
IGPURURRURRED TSHWJ XEEB:
Reacts nrog p, s, thiab tsis yog xim hlau suav nrog hauv txhuas melts.
Cim npe nrov: Kev paub txog kev tshaj lij ntawm silicon calcium, Tuam Tshoj tshaj lij kev paub ntawm cov khoom sib xyaw ua si silicon