Normalizing kev kho cua sovtsis txhim kho corrosion kuj ntawm SPA-H weathering steel, thiab nws tsis txo cov cuab yeej tseem ceeb no -corrosion kuj nyob rau hauv SPA-H yog ib tug intrinsic yam ntxwv txiav txim siab los ntawm nws cov tshuaj muaj pes tsawg leeg (Cu, Cr, P, Ni) thiab tsim ib tug tiv thaiv patina, thaum normalizing tsuas yog hloov cov hlau lub microstructure thiab mechanical zog yam tsis tau hloov nws cov tshuaj pleev.
Cov ntsiab lus tseem ceeb ntawm Corrosion Resistance & Normalizing
● Corrosion kuj ntawm SPA-H yog chemistry-tsav, tsis microstructure-tsav
SPA-H lub peev xwm los tsim ib qhov ntom ntom, ruaj khov tiv thaiv patina thiab tiv thaiv atmospheric corrosion stems los ntawm alloying ntsiab (0.20-0.50% Cu, 0.30-1.25% Cr, 0.07-0.15% P) ntxiv thaum lub sij hawm steelmaking. Cov ntsiab lus no tsiv mus rau cov hlau nto thaum lub sij hawm oxidation los tsim ib hydroxycarbonate- nplua nuj patina uas thaiv cov xeb ntxiv -normalizing tsis ntxiv, tshem tawm, los yog hloov cov concentration ntawm cov corrosion-cov khoom tiv taus.
●Normalizing tsuas yog hloov kho microstructure (tsis muaj kev cuam tshuam rau patina tsim)
Normalizing refines lub steel lub grain qauv (kom zoo equiaxed ferrite-pearlite) thiab txo qhov seem seem los ntawm cua sov rau 880-920℃thiab huab cua-txias. Thaum cov nplej loj thiab cov kev ntxhov siab sab hauv cuam tshuam rau cov khoom siv kho tshuab (tawv, ductility, lub zog), lawv tsis cuam tshuam rauceev, uniformity, los yog ceevntawm patina tsim ntawm SPA-H nto. Ib qho SPA zoo li qub-H tivthaiv thiab tsis kho (kub / txias- dov) ib qho yuav ua rau tib qho kev tiv thaiv patina ntawm tib tus nqi thaum raug rau ib puag ncig ib puag ncig (lub nroog, nyob deb nroog, me me ntug hiav txwv).
●Indirect me nyiaj pab rausiv taucorrosion kev ua tau zoo (tsis intrinsic kuj)
Normalizing relieves sab hauv residual stresses los ntawm dov/welding uas yuav ua rau me me nto warping los yog micro{0}} tawg. Cov kev tsis xws luag no tuaj yeem tsim cov crevices me me uas cov ntxiab ya raws thiab ua kom nrawm hauv zos pitting thaum ntxov ntawm qhov raug. Los ntawm kev tshem tawm cov teeb meem no, normalizing pab cov hlau nto nyob ib puag ncig, uastxhawb kev tsim patina zoo ib yam-tab sis qhov no yog qhov kev txhim kho thib ob rau kev ua tau zoo, tsis yog ib qho kev txhawb nqa rau cov hlau tsis muaj zog tiv thaiv nws tus kheej.
