1. Nce flitting dab teg thiab nce ncaj hloov hloov hloov qhov kub (DBTT)
Carbon lub luag haujlwm: Raws li taw qhia hauvNtsiab lus 3thiabNtsiab lus 4, muaj kev nce hauv cov ntsiab lus carbon ntxiv txhim kho cov steel cov txiaj ntsig taw tes thiab tensile muaj zog tab sis cuam tshuam txo nws cov plasterity (piv txwv li kev cuam tshuam) thiab cuam tshuam tawv. Ntawm qhov kub tsawg tsawg, carbon txhawb nqa kev tsim ntawm brittle beges (xws li coarse carrate) thiab nce cov hlau ua tsis tau tawg tsis muaj kev ntxhov siab me me.
Quantitive Constrain: Txhawm rau txo txoj kev pheej hmoo no, s355j0wp nruj me ntsis cov ntsiab lus roj carbonTsawg dua los yog sib npaug rau 0.12%(Lub ntsiab 1 thiab 6). Qhov no yog qis dua li 0.2% sab sauv txwv rau dav dav tsawg- qhov kub thiab txias 4) thiab ua kom haum rau lub ntiaj teb ntawm kev siv "Qis- carbon (<0.15%)" materials for low-temperature resistance (Summary 4). By controlling carbon, the steel's ductile-brittle transition temperature (DBTT) is reduced, ensuring it maintains toughness even at near-0°C (consistent with the "J0" grade requirement for impact resistance at 0°C, per Summary 6).
2. Tsis muaj zog qis - kub cuam tshuam tawv
Lub tshuab: Cov ntsiab lus carbon siab cov ntsiab lus ua rau cov dej nag ntawm cov nag lossis daus ntawm Carbide Cov Lus (piv txwv, Fe₃C) ntawm cov ciaj ciam. Ntawm qhov kub tsis tshua kub, cov carbides ua raws li kev tiv thaiv kev ntxhov siab ntawm cov matrix thiab ua rau cov kab tawg kom pib thiab nthuav tawm sai sai thaum muaj kev cuam tshuam (ntsiab 3).
Sib piv nrog alloying ntsiab: Thaum S355J0WP muaj npib tsib xee (ni) los txhim kho qhov qis qis (MN Piv txwv li, txawm tias muaj 1.0-1.5% MN (cov ntsiab lus carbon ntau dua 0.12% tseem yuav nce lub DBTT thiab qis dua kev cuam tshuam rau qhov kev xav tau J0.
3. Impairs Vertability, tsis ncaj rau cov tsawg - kub ua ke ua haujlwm
Carbon sib npaug (cet) tswj: Raws li tau hais tseg hauvNtsiab lus 2(Rau s3555j0, ib cov khoom siv nrog cov ntsiab lus zoo sib xws (cet} Alloy Martensite hauv tshav kub}} bein cuam tshuam cheeb tsam (Haz) thaum vuam. Rau S3555555555555 dua lossis sib npaug ntawm 0.12% cov kev txwv ntawm welded utains kub (ua kom pom tseeb rau lub cet welded (kev tsim kho welded "Welded tsim" hauv cov ntsiab lus 6).
Tsis txhob mob khaub thuas txias: Cov pa roj carbon ntau kuj tseem ua rau cov hlau tawg "txias" (xaus 3) {{1} {{1} {1}- Qhov chaw kub uas muaj kev ntxhov siab uas muaj kev ntxhov siab. Cov pa roj carbon tsawg ntawm S355J0wP tsawg kawg kev pheej hmoo no, ua kom txhua tus qauv (suav nrog cov pob qij txha) ua rau cov pob qij txha) ua rau muaj qhov chaw qis hauv qis}}} kub ib puag ncig.
4. Txo cov atmospheric corrosionance, tsis ncaj kev cuam tshuam tsawg - kub tsis ntev
Cov roj carbon cov nyhuv tsis zoo: Raws li tau sau tseg hauvNtsiab lus 3, High cov pa roj carbon ntau txo cov kev siv hluav taws xob txo cov hlau atmospheric tsis kam {}}}}} tus xeb hlau hights yooj yim dua hauv kev qhib. Hauv qis - kub, siab-}}}}}}}}}}}}}}} humid}}}} humid} humid} humid} humid}}}}},},} humid} humid} humid} humid} humid}}},} humid}},},} environ} humid} humid},} humid} humid} humid},},},},,} humid},,} humid,} humid,} humid,} humidုင်း) Cov corrosion tsis muaj zog tus hlau hla-}}}} seem cov ntsiab lus ntxiv, tsuj nrawm}} kub nyem bacture.
Synergy nrog alloying ntsiab: Cov ntsiab lus carbon qis (tsawg dua los yog sib npaug ntawm 0.12% tso cai rau kev tsim cov tawv nqaij (CU) Qhov no ua kom cov hlau tswj hwm ob leeg corrosion tsis kam thiab kho tshuab kev ntseeg siab nyob rau hauv qis {}} kub, corrosive ib puag ncig.
