TusCov txheej txheem kho cua sov rau Q550NHERDER STEELYog ua tib zoo tsim los ua kom zoo dua nws cov khoom siv cov khoom siv thiab corrosion tsis kam thaum muaj kev tswj hwm weldability. Hauv qab no yog cov ncauj lus kom ntxaws tawg ntawm nws cov kev kho kom sov thiab kev txiav txim siab zoo:
1. Txheem kev kho cua sov rau Q550NH
Q550nh feem ntau yog muab rau hauvThermomecthahanically tswj kev ua (TMCP) lossis cov xwm txheej qub, nyob ntawm cov chaw tsim khoom thiab cov ntawv thov yuav tsum:
(1) thermomechanical tswj kev ua (TMCP)
Kev ua:
Kub Rolling ntawm kev tswj hwm kub (≈850-950 qib) ua raws li kev ua kom txias nrawm.
Muab kev sib xyaw ua ke thiab kev tswj kom yog ntsuas kub kom ua kom cov qauv zoo.
Qhov Zoo:
Lub zog siab dua thiab tawv tsis muaj kev kho cua sov ntxiv.
Txhim kho Weldability vim tias txo cov roj hluav taws xob (CEV).
(2) Li no (yeem)
Kev ua: Cua sov rau880-920 degree, tuav, ces cua txias.
Lub hom phiaj:
Homogenze microstructure (ferrite + Pethlite).
Txhim kho cov kev cuam tshuam nyuaj rau tsawg -} sov daim ntawv thov.
2. Post {- Weld Kev Kho Tshav Kub (PWHT)
Tsis yog yuav tsum tau uaRau feem ntau cov ntawv thov tab sis tej zaum yuav tsum muaj rau:
Thick sections (>30 hli)los ua kom muaj kev ntxhov siab seem.
Tseem ceeb heev qauv(xws li, cov hlab ntsha siab, pob zeb offshore).
Raug pwhals:
Qho so: 550-600℃(hauv qab AC1 kom tsis txhob muaj theem hloov).
Tuav Sijhawm: 1-2 teev ib 25 hli tuab.
Cua txias: Lub cub tawg qeeb.
3. Kev ntxhov siab relieving
Siv rau cov welded welded sib dhos kom txo qis distortion thiab tawg.
Yam xwm txheej: 600-650℃rau 1-2 teev, ua raws li los ntawm qeeb cua txias.
