Q345NH weathering steel tsis yog tsim los rau siab -kev pab kub, thiab nws cov kev ua tau zoo deteriorates ho thaum rhuab.
1. Kev nyab xeeb kub ntau yam
Ntev - siv tas mus li: tsuas ntseeg tau hauv qab no150 degree
Luv - lub sij hawm raug raug: mus200-250 degree
Tshaj 250 degree: lub zog poob sharply; tsis haum rau load-cov kabmob
2. Yuav ua li cas thaum kub kub
● Tawm thiab tensile lub zog poob sai
Raws li qhov kub thiab txias, cov hlau softens noticeably thiab tsis muaj peev xwm tswj tau nws tus tsim load peev xwm.
● Tiv thaiv xeb txheej tsis ua hauj lwm
Es tsis txhob ua ib tug ntom, ruaj khov patina, kub kub ua rau xoob, tuab oxide nplai uas yooj yim spills. Nws tiv thaiv huab cua yog ploj tag.
● Microstructure thiab toughness degrade
Kev kub siab ntev ua rau cov nplej coarsening, txo qhov cuam tshuam toughness, thiab nce brittleness.
●Creep thiab deformation mus tas li
Under sustained load at >300 degree, Q345NH yuav maj mam deform thiab tsis tuaj yeem tswj qhov seem stability
3. Cov xwm txheej tsim nyog thiab tsis tsim nyog
● Txais
Qhov kub thiab txias (-20 ° ~ 120 ° C)
Sab nraum zoov choj, tsev, tsheb, toj roob hauv pes tsim
● Tsis haum
Boilers, flues, chimneys, cav tso qhov chaw
Rauv shells, siab -kub pipelines
Ntev -lub sij hawm nyob ze ntawm qhov chaw sov los yog siab - qhov chaw ua haujlwm kub
Any environment with sustained temperature >250 degree
