Dab tsi yog qhov tseem ceeb ntawm silicon chromium alloys hauv kev lag luam?

Ferro silicon chrome alloysFeem ntau yog tsim los ntawm silicon (Si) thiab chromium (Cr):

 Kev sib xyaw ntau yam:Cr 45% -55%, Si 35% -45%, impurities C Tsawg dua lossis sib npaug 0.10%, S Tsawg dua lossis sib npaug 0.04%, P Tsawg dua lossis sib npaug 0.04%, Al Tsawg dua lossis sib npaug 1.0%;

 Lub cev muaj zog:Melting point 1350-1450 degree, ceev 6.5-6.8 g / cm³, silvery-grey lumps (10-60 mm) los yog granules (1-10 mm), chemically active nyob rau hauv high kub, muaj ob qho tib si txo thiab alloying peev xwm;

 Core zoo:Integrate deoxidation thiab alloying, siab chromium rov qab tus nqi (Ntau dua los yog sib npaug rau 90%), tus nqi 15%-20% qis dua ntshiab ferrochrome, haum rau loj-scale stainless hlau ntau lawm.

(1) Steelmaking Deoxidation: Synergistic Deoxidation thiab Inclusion Optimization

Silicon chromium alloys muaj ob qho tib si deoxidation thiab chromium supplementation functions nyob rau hauv steelmaking, ua rau lawv tshwj xeeb tshaj yog haum rau stainless hlau thiab tshav kub-resistant steel ntau lawm:

 Core Reaction Mechanisms:

Silicon Deoxidation:Si + 2FeO → SiO₂ + 2Fe (Lub generated SiO₂ yog yooj yim floated thiab tshem tawm);

Chromium{0}}Assisted Deoxidation:Cr + FeO → CrO + Fe (CrO thiab SiO₂ tsim ib qho qis- melting- taw tes sib xyaw slag, ntxiv dag zog rau cov nyhuv deoxidation);

 Quantitative Deoxidation nyhuv:

Ntxiv 0.5% -1.0% tuaj yeem txo cov pa oxygen ntawm cov hlau molten los ntawm 80-100ppm mus rau 25-40ppm, ua tiav cov deoxidation efficiency ntawm 60% -75%;

Comparative zoo:Txhim kho deoxidation efficiency piv rau ib leeg ferrosilicon . 20% -25%, nrog rau ib txhij chromium supplementation kom tsis txhob muaj cov txheej txheem cumbersome ntawm kev ntxiv ferrochrome cais tom qab;

(2) Alloying nyhuv: Chromium supplementation thiab kev ua tau zoo

SiCr alloy yog qhov tseem ceeb ntawm chromium hauv kev tsim cov hlau tsis muaj steel thiab qis - alloy steel. Alloying txhim kho corrosion kuj, lub zog, thiab siab - kub ntawm cov khoom:

 Core zog mechanism:

Chromium:Ua ib daim ntawv tuab Cr₂O₃ passivation zaj duab xis ntawm cov hlau nto, cuam tshuam kev nkag mus ntawm cov xov xwm corrosive thiab txhim kho corrosion kuj;
Silicon:Ntxiv dag zog rau ferrite lattice los ntawm kev daws teeb meem, txhim kho lub zog thiab hardness ntawm cov hlau;

 Quantitative Performance improvement:

304 stainless hlau ntau lawm:Ntxiv silicon chrome alloy tswj cov ntsiab lus chromium hauv cov hlau mus rau 18% -20%, txuas ntxiv cov ntsev tsuag tshuaj tiv thaiv lub sijhawm los ntawm 200 teev mus rau ntau tshaj 500 teev, thiab lub zog tensile Ntau dua lossis sib npaug rau 515MPa;
Tsawg- alloy tshav kub-resistant steel ntau lawm:Ntxiv 1.0%-1.5% ferro silicon chromium alloy, cov ntsiab lus chromium nyob rau hauv cov hlau ncav cuag ... 5% -7%, kub siab (600 degree) tensile lub zog tseem ntau dua los yog sib npaug rau 300MPa, haum rau boiler thiab tshuaj cov khoom hlau.

(1) Stainless hlau kev lag luam: core alloying raw khoom

Chromium silicon alloy yog ib qho tseem ceeb raw khoom rau zus tau tej cov austenitic thiab ferritic stainless hlau, accounting rau ntau tshaj 70% ntawm nws daim ntawv thov tag nrho:

 Haum steel qib:

Austenitic stainless hlau (304, 316L):Ntxiv chromium rau 18% -22%, ua ke nrog npib tsib xee los tsim cov qauv corrosion-resistant;
Ferritic stainless hlau (430, 444):Ntxiv chromium rau 16% -20%, tsis tas yuav ntxiv nickel, txo cov nqi tsim khoom;

 Txheej txheem compatibility:

Electric arc rauv / converter steelmaking:Ntxiv thaum tapping (5-50mm thaiv), ntxiv nyiaj 0.8%-1.5%, chromium rov qab tus nqi 90%-95%;
AOD rauv refining:Ua ke nrog argon- cov txheej txheem oxygen decarburization, ntxiv nyiaj 0.5%-1.0%, tswj cov ntsiab lus chromium, txhim kho cov purity ntawm molten steel;

(2) Tsawg alloy steel thiab tshav kub-resistant steel kev lag luam: Kev ua tau zoo ntawm cov khoom siv raw

Chrome silicon alloys yog siv rau hauv kev tsim cov hlau tsis tshua muaj siab -lub zog steel thiab tshav kub- cov hlau tiv taus los txhim kho cov khoom siv kho tshuab thiab siab - qhov kub thiab txias ntawm cov ntaub ntawv:

 Tej kev siv:

Engineering machinery steel (Q690):Ntxiv 0.3%-0.5% SiCr alloy, cov ntsiab lus chromium hauv cov hlau yog 0.8%-1.2%, lub zog tensile nce los ntawm 690MPa rau 750MPa, thiab qhov cuam tshuam toughness (-40 degree) yog ntau dua los yog sib npaug rau 47J / cm²;
High-kub kub-cov hlau tsis muaj zog (12Cr1MoV):Ntxiv 1.0%-1.2% ferro silicon chrome alloy, cov ntsiab lus chromium yog 1.0%-1.5%, cov ntsiab lus silicon yog 0.5%-0.8%, thiab lub siab kub creep zog yog txhim kho. 20% -25%, haum rau chav turbines thiab boiler kav;

(3) Kev lag luam Casting: Raw khoom rau hnav-resistant castings

Silicon chromium alloy yog siv rau hauv kev tsim cov hnav-tiv taus castings los txhim kho lub hardness thiab hnav tsis kam ntawm castings:
Core Application:

Mechanism ntawm kev ua:Chromium thiab carbon tsim Cr₇C₃ nyuaj theem, silicon refines cov nplej, thiab synergistically txhim kho cov hnav tsis kam ntawm castings;
Quantitative effect:Ntxiv 3% -5% silicon chrome alloy nce hardness (HRC) ntawm castings ntawm 25-30 mus rau 45-50, thiab txo hnav los ntawm 40% -50;
Tsim nyog scenarios:Mining machinery qhov chaw (xws li crusher liners), engineering machinery hnav-cov khoom tiv taus (xws li excavator thoob hniav);

(4) Lwm yam kev thov scenarios

Ferroalloy ntau lawm:Raws li tus neeg sawv cev txo qis los npaj lwm cov chromium alloys (xws li qis-carbon ferrochrome), chromium rov qab tus nqi nce 10%-15%;
Cov khoom siv vuam:Raws li cov khoom siv raw rau vuam rods thiab fluxes, tus nqi ntxiv ... 15% -20%, txhim kho weld corrosion kuj thiab lub zog, haum rau stainless hlau vuam;

Qhov tseem ceeb ntawm kev ua haujlwm:

Stainless hlau thiab cua sov-cov hlau tiv taus yuav tsum xaiv qib siab- chromium qib (Cr Ntau dua lossis sib npaug li 55%) kom ntseeg tau tias muaj kev tiv thaiv corrosion thiab siab -kub kev ua haujlwm;

Tus nqi sib npaug:

Tsawg- alloy steel thiab cov khoom siv zoo tib yam yuav tsum xaiv qib siab -chromium qib (Cr 50%-55%) kom sib npaug kev ua haujlwm thiab nqi;

Txheej txheem compatibility:

Steelmaking yuav tsum xaiv daim ntawv thaiv (5-50mm), casting yuav tsum xaiv granular daim ntawv (1-10mm), thiab vuam cov ntaub ntawv yuav tsum xaiv hmoov daim ntawv (200-300 mesh).