Calcium silicon alloy (CaSi)yog ib tus neeg ua haujlwm zoo sib xws hauv kev lag luam metallurgical. Los ntawm cov nyhuv synergistic ntawm silicon (Si) thiab calcium (Ca), nws ua tiav kev sib sib zog nqus deoxidation, desulfurization, thiab kev hloov pauv, ncaj qha txiav txim siab purity ntawm molten steel thiab tag nrho kev ua haujlwm ntawm cov hlau. Nws yog cov khoom siv tseem ceeb hauv kev tsim cov nruab nrab - mus rau - siab - kawg steel.
Core Advantages:High deoxidation thiab desulfurization efficiency, zoo heev suav nrog kev hloov kho; sib sib zog nqus refining tuaj yeem ua tiav nrog qhov sib ntxiv ntawm tsuas yog 0.2%-0.5% ib tuj ntawm cov hlau, ua rau nws nyiam cov neeg ua haujlwm refining rau high-end steel ntau lawm.
Daim ntawv thiab ntim:Blocks (zoo rau ladle refining),calcium silicon hmoov/cored hlau (tsim rau cov txheej txheem nruam nruam), ntim rau hauv cov dej noo- pov thawj hlau nruas lossis ton hnab; kev thauj mus los thoob ntiaj teb xav tau kev sib khi los tiv thaiv oxidation.
Deoxidation Principple thiab Quantitative nyhuv ntawm Silicon Calcium Alloy
(1) Core Deoxidation Mechanism: Silicon-Calcium Synergy, Deep Purification
Basic Deoxidation ntawm Silicon:
Reaction Principple:Si + 2FeO → SiO₂ + 2Fe (spontaneous nyob rau hauv molten steel ntawm 1500-1600 degree), SiO₂ muaj ib tug tsawg dua ntom dua molten steel thiab yooj yim floats rau daim slag;
Cov txiaj ntsig tseem ceeb:Cov deoxidation me me tsis txhob ua rau kub hnyiab ntawm cov hlau molten, thiab cov khoom tsim SiO₂ tuaj yeem tsim qis -melting- cov ntsiab lus sib xyaw nrog lwm cov oxides (xws li CaO・SiO₂), ntxiv kev txhim kho kev sib cais.
Txhim kho Deoxidation los ntawm Calcium:
Reaction Principple:2Ca + O₂ → 2CaO, Ca + Al₂O₃ → CaO・Al₂O₃. Calcium muaj kev sib raug zoo rau cov pa oxygen dua li silicon thiab txhuas, tshem tawm cov pa oxygen seem hauv cov hlau molten thaum hloov kho nyuaj thiab nkig Al₂O₃ suav nrog.
Lub luag haujlwm tshwj xeeb:Cov npuas tsim los ntawm calcium volatilization do cov hlau molten, txhawb kev sib tsoo thiab flotation ntawm inclusions, yog li txhim kho deoxidation uniformity.
Synergistic Deoxidation nyhuv:
Silicon ua ntej txo cov ntsiab lus oxygen hauv cov hlau molten, tsim cov xwm txheej rau calcium deoxidation. Qhov tshwm sim Ca₂SiO₄ thiab lwm cov tshuaj sib xyaw ua ke ntxiv txhim kho deoxidation efficiency, txhim kho nws los ntawm 30% -40% piv rau ib leeg silicon lossis calcium deoxidation.
Quantitative Effects los ntawm Scenario
| Hom hlau | CaSi alloy ntxiv tus nqi | Cov ntsiab lus oxygen pib (ppm) | Oxygen ntsiab lus tom qab refining (ppm) | Deoxidation efficiency |
|---|---|---|---|---|
| Ordinary carbon hlau (Q235) | 0.2%-0.3% | 80-100 | 40-50 | 45%-60% |
| Tsawg- alloy siab- lub zog steel (Q355) | 0.3%-0.4% | 90-110 | 35-45 | 55%-68% |
| Stainless hlau (304) | 0.4%-0.5% | 100-120 | 25-35 | 65%-79% |
| Alloy steel qauv (40Cr) | 0.3%-0.4% | 85-105 | 30-40 | 58%-71% |
Txoj Cai Desulfurization thiab Quantitative Effects ntawm Silicon Calcium Alloy
(1) Core Desulfurization Mechanism: Calcium as the Dominant Factor, Silicon as the Auxiliary Co-factor
Calcium-Dominant Desulfurization:
Reaction Principple:CaS + FeS → CaS + Fe (zoo dua nyob rau hauv cov hlau molten), CaS muaj qhov melting point ntawm 2450 degree, yog insoluble nyob rau hauv molten steel, precipitates raws li cov khoom thiab floats rau lub slag;
Cov txiaj ntsig tseem ceeb:Calcium muaj kev sib raug zoo heev rau leej faj, thiab nws lub peev xwm desulfurization yog 5-10 npaug ntawm manganese, txo cov sulfur ntsiab lus hauv cov hlau molten kom qis dua 0.01%.
Silicon's Auxiliary Role:
Txo qhov nro ntawm cov hlau molten, txhawb kev sib tsoo thiab sib sau ua ke ntawm CaS hais, thiab ua kom lawv ntab thiab sib cais;
Txo cov pa oxygen hauv cov hlau molten thaum lub sij hawm deoxidation, txo qhov cuam tshuam ntawm oxygen ntawm cov tshuaj tiv thaiv desulfurization (tsis txhob tsim cov SO₂), thiab txhim kho qhov hloov pauv ntawm cov tshuaj tiv thaiv desulfurization.
(2) Muaj nuj nqis los ntawm Scenario
| Hom hlau | SiCa alloy ntxiv tus nqi | Initial sulfur cov ntsiab lus (%) | Cov ntsiab lus sulfur tom qab refining (%) | Desulfurization efficiency | Core tus nqi |
|---|---|---|---|---|---|
| Ordinary carbon hlau (Q235) | 0.2%-0.3% | 0.03-0.05 | 0.015-0.025 | 30%-50% | Tsis txhob thermal brittleness |
| Tsawg- alloy siab- lub zog steel (Q355) | 0.3%-0.4% | 0.02-0.04 | 0.008-0.015 | 55%-70% | Txhim kho weldability |
| Stainless hlau (304) | 0.4%-0.5% | 0.015-0.03 | 0.003-0.008 | 70%-85% | Txhim kho corrosion kuj |
| Hnav-cov hlau tsis muaj zog (NM450) | 0.3%-0.4% | 0.02-0.04 | 0.006-0.012 | 65%-80% | Txhim kho hnav tsis kam |
Cov yam tseem ceeb cuam tshuam rau Deoxidation thiab Desulfurization cuam tshuam thiab kev tswj xyuas
Steel kub:Qhov ntsuas kub zoo tshaj plaws yog 1500-1600 degree. Yog tias qhov ntsuas kub qis dhau (<1450℃), the reaction rate decreases; if the temperature is too high (>1650 degree), calcium volatilization poob nce.
Txoj kev ntxiv:Txoj kev pub mis (calcium silicon cored hlau) yog siv nyob rau hauv ladle refining. Qhov sib ntxiv sib xws yog qhov zoo, thiab kev ua haujlwm ntawm deoxidation thiab desulfurization yog 15% -20% siab dua li kev pub noj ncaj qha.
Thawj cov pa oxygen thiab sulfur cov ntsiab lus hauv cov hlau:Thaum cov ntsiab lus oxygen thiab sulfur siab dhau lawm, cov nyiaj ntxiv yuav tsum tau nce kom tsim nyog lossis ntxiv rau theem kom tsis txhob muaj cov tshuaj tiv thaiv txaus.
