Ntau yam tseem ceeb cuam tshuam rau qhov cuam tshuam toughness ntawm Q355NH weathering steel,txawm nyob rau tib qhov ntsuas kub. Hauv qab no yog cov ncauj lus kom ntxaws, kev piav qhia koj tuaj yeem siv ncaj qha rau cov ntaub ntawv qhia lossis cov neeg siv kev sib txuas lus.
1. Hlau Phaj Thickness
Cov phaj nyias nyias (tsawg dua lossis sib npaug li 16 hli)Finer grain qauv, ntau yam muaj pes tsawg leeg →siab zog toughness.
Thicker plates (>16 hli)Kev ua kom txias qeeb qeeb thaum lub sijhawm tsim khoom → coarser hauv cov nplej, ua tau qhov chaw sib cais →qis toughness, tshwj xeeb tshaj yog nyob rau nruab nrab -thickness cheeb tsam.
Tus qauv cuam tshuam qhov tseem ceeb feem ntau txo qis thaum thickness nce.
2. Tshuaj muaj pes tsawg leeg
Cov ntsiab lus tseem ceeb ncaj qha cuam tshuam rau toughness:
Cov ntsiab lus carbon (C).Siab C nce zog tab sistxo toughnessthiab ua kom txias - tawg rhiab heev.
Manganese (Mn)Txhim kho toughness nyob rau hauv tus txheej txheem ntau yam; Tshaj Mn tuaj yeem ua rau muaj kev sib cais.
Phosphorus (P) thiab Sulfur (S)Ob leeg yog teeb meem impurities uas ua rau grain ciam teb embrittlement.Q355NH tswj P Tsawg dua los yog sib npaug rau 0.030% thiab S Tsawg dua los yog sib npaug rau 0.025% kom ntseeg tau yooj yim toughness.
Huab cua alloys (Cu, Cr, Ni)Ni me ntsis txhim kho qis -kub toughness; Tshaj Cr/Cu tuaj yeem txo qhov hnyav me ntsis yog tias tsis sib npaug.
3. Heat Afected Zone (HAZ) los ntawm Vuam
Vuam tshav kub hloov cov microstructure nyob ze ntawm qhov vuam.
Overheated cheeb tsam: grain coarsening →sharply txo toughness.
Cov hlau tsis sib xws, cov khoom siv hluav taws xob ntau dhau, lossis tsis muaj preheatingtuaj yeem ua rau hardening hauv HAZ thiab qis zog cuam tshuam.
Weld defects (porosity, cracks, inclusions) kuj txo cov toughness zoo.
4. Microstructure & Cov txheej txheem ntau lawm
Kub dov thiab tswj cua txiasRefined nplej=siab dua toughness.
Normalizing lossis tswj cov txheej txheem dovUa kom zoo dua qub ferrite-pearlite qauv thiab zoo dua toughness.
Cov khoom uas tsis kho los yog txias sai heevtej zaum yuav muaj zog dua thiab qis toughness.
5. Strin Hardening & Txias ua hauj lwm
Bending, shearing, stamping, lossis mechanical deformation ua rautawv tawv.
Kev ua haujlwm txias txias ua rau muaj zog tab sistxo plasticity thiab cuam tshuam toughness.
Ntws notches, khawb, los yog ntug tsis xws luag ua raws li kev ntxhov siab concentrators thiab txo qhov cuam tshuam qhov tseeb.
6. Kev laus & Kev Pabcuam Ib puag ncig
Ntev - lub sij hawm raug sab nraumStable patina tsis ua mob toughness, tab sis
Local pitting corrosiontxo cov ntoo khaub lig zoo-section thiab tsim kom muaj kev ntxhov siab.
Nyob rau hauv siab - kub los yog ntev - lub sij hawm cyclic loading ib puag ncig, cov khoom aging tej zaum yuav maj mam txo toughness.
7. Loading Rate & Notch nyhuv
Impact toughness yogrhiab heev rau loading ceev; cuam tshuam sai dua=qis absorbed zog.
Ntxim qab heev(los ntawm vuam, txiav, corrosion pits) drastically txo toughness piv rau du nto.
