1. Dab tsi yog qhov yooj yim txhais ntawm GB / T 712h40 yeeb nkab?
AH40 yog lub siab-} lub zog HULL qauv txheej txheem txheej txheem (GB / T 712-2023 "tus qauv steel rau cov nkoj thiab sab nrauv engineering"). Nws yog qib ib thiab haum rau siv nyob rau hauv ib puag ncig ib puag ncig los ntawm chav kub txog -20 degree. Nws cov rooj sib tham naming yog raws li nram no:
"A" qhia txog qib zoo dua (haum rau cov qauv nkoj dav dav);
"H40" qhia txog yam tsawg kawg nkaus lub zog ntawm ntau dua lossis sib npaug rau 390 MPa (40 kgf / mm²).
Cov ntaub ntawv no ua tiav qhov kev sib npaug ntawm lub zog siab thiab zoo heev weldability los ntawm microalloying (NB, V, thiab ib qho kev tsim khoom txias (TMCP). Nws yog ib cov khoom tseem ceeb rau cov khoom siv rau cov thawv loj thiab cov neeg nqa khoom.
2. Dab tsi yog cov ntawv thov tseem ceeb rau AH40 yeeb nkab? Cov txheej txheem nkoj loj: High- Cov chaw nqa khoom xws li cov lawj thiab sab plating ntawm cov nkoj;
Cov khoom siv Marine Engineering: Thauj {- Cov kabmob ntawm ntug dej ntawm ntug kev teeb tsa thiab floating (floating ntau lawm cia khoom thiab khoom siv nkoj offloading);
Cov dej hiav txwv hiav txwv: nws -20℃kev cuam tshuam nyuaj ntsib tus qauv (KV2 ntau dua lossis sib npaug rau feem ntau cov chaw xa khoom.
3. Dab tsi yog cov kev ua haujlwm ntawm AH40 piv rau cov khoom lag luam hlau dog dig (xws li qib ib qho hlau)?
Ua kom zoo dua lub zog: cov txiaj ntsig lub zog (390 MPa) yog kwv yees li 66% siab dua li cov qib ApLE Ap Steel (235 MPa), ua rau muaj kev txo qis qis;
Weldability: qhov qis dua cov pa roj carbon sib npaug (CEV tsawg dua lossis sib npaug nrog 0.42%) Tsim kev pheej hmoo ntawm kev pheej hmoo ntawm kev tawg txias thaum vuam;
Kev lag luam sib npaug: piv rau siab dua-}}}}} {{}} ua hauj lwm zoo hauv cov pa hluav taws xob ib puag ncig.
4. Dab tsi yog cov ntsiab lus tseem ceeb kom nco ntsoov thaum ua thiab vuam ah40 yeeb nkab? Cov txheej txheem vuam: Tsawg {- hydrogen mroundment (xws li AWS ESHORS (xws li ib tug preheat kub ntawm 80-120℃(siab dua rau phaj tuab> 20mm).
Kev tswj txias tswj: Ib tug khoov cov vojvoog ntawm ntau dua lossis sib npaug ntawm 2.5 zaug ntawm phab ntsa tuab yog pom zoo kom tsis txhob muaj qhov txias heev deformation uas tuaj yeem ua rau microcracks ntau dhau.
Tshaj tawm - weld kuaj: sib nqus article kuaj (MT) lossis ultrasonic lossis ultrasonic lossis siv rau cov tsiaj tseem ceeb.
5. Yuav ua li cas yog Ah40 steel yeeb nkab kuaj xyuas? Dab tsi yog cov tseem ceeb tshuaj xyuas qhov ntsuas? Cim Cim: Cov yeeb nkab Steel yuav tsum tau cim nrog "Ah40," tus lej GB / T 712 tus lej, thiab cov khoom siv cua sov.
Daim ntawv pov thawj yuav tsum muaj: cov ntaub ntawv pov thawj (MTC) yuav tsum muaj:
Tshuaj lom neeg tshuaj lom neeg (piv txwv li, C tsawg dua lossis sib npaug nrog 0.18%, mn tsawg dua los yog sib npaug nrog 1.60%);
Cov khoom siv neeg kho tshuab (tawm lub zog ntau dua los yog sib npaug rau 390 MPa, tensile lub zog 490-630 MPA);
-20℃cuam tshuam cov ntaub ntawv (nruab nrab ntawm peb cov quav loj dua los yog sib npaug rau 34 j, ib qho hnoos qeev ntau dua lossis sib npaug rau 24 j);
Tsis - Kev sim ua txhaum: UT / MT / MT / RT ntsuas los yog tshuaj ntsuam xyuas los yog ua raws li kev xav tau.
