1. Kev nyuaj siab nyem annealing (feem ntau)
Txheej txheem tsis: Ua kom sov lub taub hau (thiab tag nrho cov kev sib koom ua ke welded) rau550-620 degree(zam dhau 620℃kom tiv thaiv tshaj-} muag muag ntawm lub hauv paus hlau), tuav ntawm qhov kub no rau1-2 teev rau 25mm ntawm phaj tuab, tom qab ntawd txias qeeb (txias tus nqi tsawg dua los yog sib npaug ntawm 150℃/ h) mus rau chav tsev kub.
Cuam tshuam rau haz: Txo cov vuam kev sib cav sib ceg los ntawm 60-80%, tshem tawm brittle micrtrittures (piv txwv li, kev sib cav sib ceg (thiab txhim kho ductility {
2. Li normalization (rau kev puas tsuaj loj funch)
Txheej txheem tsis: Tshav kub sib koom tes (suav nrog kev ua kom zoo880-920 degree(saum toj Q355NH's AC3 Kev Hloov Kub (kub hloov), tuav rau0.5-1 teevTxhawm rau kom ntseeg tau tias cov kev ua kom zoo, tom qab ntawd txias hauv huab cua (nrawm dua li annealing tab sis qeeb dua li quenching).
Cuam tshuam rau haz: Kev kho kom zoo rau cov nplej hauv lub taub, kho kom zoo nkauj thiab tsis muaj zog}}}}}}}}}}}}}}}}} Kuv yuav tuaj yeem daws lub zog (tswj tau nyob rau hauv kev siv tau).
3. Post {{- weld Tempering (Ntxiv Rau Kev Txom Nyem)
Txheej txheem tsis: Tom qab kev ntxhov siab pab txhawb kev ua haujlwm, rov ua kom rov ua kom muaj400-500 degree, tuav rau1 teev, tom qab ntawd txias rau hauv huab cua.
Cuam tshuam rau haz: Ntxiv mus softens Brittle Phajes, ruaj khov microstructure, thiab txhim kho ntev}}} tseem ceeb rau cov qauv hluav taws xob lossis nrawm nrawm.
Cov ntawv tseem ceeb
Tsis yog txhua Q355NH Welds xav tau duab: rau nyias daim hlau (<12mm) or non-load-bearing structures (e.g., decorative parts), PWHT may be omitted if welding parameters are well-controlled (low heat input, matching consumables).
Zam txhob overheating: tshaj 650℃yuav rhuav cov Q355NHing faib tawm, faib cov huab cua tsis zoo.
