Ntau yam tseem ceeb tshaj li cov ntsiab lus alloying muaj zog cuam tshuam rau qhov tsis tshua muaj kub cuam tshuam toughness ntawm S355J0WP.
1. Rolling & ntau lawm txheej txheem
Tswj dov / xov kubQhov kub ua tiav qis dua → finer nplej → zoo dua qis-kub toughness.Too kub dov ua rau coarse nplej → brittle ntawm qhov kub thiab txias.
Txias tus nqi tom qab dovFast uniform txias refines qauv; qeeb txias ua rau ntxhib ferrite.
2. Hlau purity ( impurities & inclusions )
Sulfur, oxygen → form elongated non{0}}metallic inclusionsThese act as crack starters and sharply reducely impact energy in cold conditions.
Internal porosity, slag, segregation kuj txo toughness.
3. Phaj thickness nyhuv (me me nyhuv)
Thicker phaj=ua rau qis-kub toughnessCov khoom siv thicker muaj kev sib cais hnyav dua, ua kom txias dua, coarser core qauv.
Cov ntawv nyias nyias ib txwm ua tau zoo dua hauv kev cuam tshuam qis.
4. Microstructure uniformity
Banded qauv, tsis sib xws ferrite / pearlite faib → nce brittleness.
Homogeneous nplua microstructure txhim kho toughness zoo heev.
5. Muaj kev ntxhov siab
Los ntawm kub dov, txiav, khoov, vuam.
High residual stress accelerates tawg qhib ntawm qhov kub thiab txias → txo qhov cuam tshuam tsis kam.
6. Welding thermal voj voog (rau fabricated qhov chaw)
Thaum tshav kub kub- thaj chaw cuam tshuam (HAZ) yooj yim ua ntxhib thiab nkig.
Txawm hais tias lub hauv paus hlau zoo, vuam tuaj yeem poob qis-temp toughness ho.
7. Kev pab cuam ib puag ncig
Qhov ntsuas kub qis dua ib txwm txo qis kev cuam tshuam lub zog.
Moisture, aging, thiab ntev - lub sij hawm load kuj degrade toughness thaum lub sij hawm.
