1. Cov qauv kev siv
Paub meej tias qhov tseeb tshaj plaws ntawm ASTM A333/A 333M (cov tshuaj lom neeg ntawm qhov version tom qab xyoo 2016 tau hloov kho, thiab ntxiv cov kev txwv tshiab xws li Cr, Ni, thiab Mo).
2. Kev tswj cov tshuaj lom neeg
Cov kev txwv ntawm cov ntsiab lus tseem ceeb:
C≤0.30% (cov pa roj carbon tsawg ua kom muaj zog), Mn 0.29-1.06% (kho nrog cov ntsiab lus C), P≤0.025%, S≤0.025% (txwv tsis pub cov khoom phom sij).
Xyoo 2016 ntxiv cov kev txwv siab dua rau Ni, Cr, Mo, thiab lwm yam (xws li Ni≤0.40%), thiab nws yog qhov tsim nyog los xyuas seb phau ntawv lav puas tau cim nrog carbon sib npaug (CET).
Kev txhim kho khoom siv: Tus qauv tshiab ntawm A333GR6 tau raug txhim kho los ntawm C-Mn hlau mus rau cov hlau tsis tshua muaj hlau, nrog kev ua tau zoo dua.
1. Cov khoom siv kho tshuab
Lub zog tensile ≥415MPa, lub zog tawm los ≥240MPa, qhov sib piv ntawm lub zog tawm los qis (qhia txog lub peev xwm hloov pauv yas)
Kev ntsuam xyuas qhov kub thiab txias qis:
Qhov kub ntawm kev sim sib txawv nrog rau phab ntsa tuab (xws li -45 ℃ ~ -52 ℃), thiab cov kev cai ntawm daim ntawv cog lus yuav tsum tau hais meej meej.
Tus nqi zog cuam tshuam yuav tsum ua tau raws li tus qauv, feem ntau xav tau ≥20J (saib ASTM A333 kom paub meej ntxiv).
2. Cov qauv metallographic
Lub xeev muab khoom yuav tsum yog ferrite + pearlite sib xws, nrog rau qhov loj ntawm 7 ~ 9 (cov nplej ntxhib tuaj yeem txo qhov sib piv ntawm cov khoom muaj zog).
Zoo dua xaiv cov kav hlau uas tau raug quenched + tempered (cov qauv yog tempered troostite, thiab qhov kub qis toughness zoo dua).
Cov txheej txheem kho cua sov
Cov ntaub ntawv kho cua sov yuav tsum tau muab: cua sov ≥815 ℃ → dej quenching → tempering kom ntseeg tau tias qhov sib xws ntawm cov qauv.
Tsis txhob kho lossis kho tsis raug lub xeev qub (cov qauv ntxhib ua rau qhov kub qis brittleness).
Xwm txheej xa khoom
Feem ntau xa tuaj rau hauv lub xeev normalized + tempered lossis quenched + tempered, uas yuav tsum tau teev tseg hauv daim ntawv cog lus.
1. Phab ntsa tuab thiab qhov cuam tshuam kub sib raug zoo
Piv txwv li: thaum lub phab ntsa tuab yog 7.62 hli, qhov kub ntawm kev sim cuam tshuam yuav tsum ncav cuag -52 ℃ (qis dua tus qauv -45 ℃).
Cov lus qhia tshwj xeeb ntawm qhov chaw: 8-1240mm × 1-200mm (SCH5S-XXS), yuav tsum tau kuaj xyuas qhov xav tau tiag tiag.
2. Cov khoom siv sib npaug zos
A333GR6≈X42N/L290N/API 5L B PSL2 (kab yeeb nkab), tab sis nws yog qhov tsim nyog los paub meej tias qhov kev ua tau zoo ntawm qhov kub qis puas tau ua tiav.
Cov ntaub ntawv yuav tsum tau kuaj xyuas
Daim ntawv pov thawj khoom siv (MTC), daim ntawv qhia txog kev kho cua sov, daim ntawv qhia txog kev ntsuas qhov kub thiab txias qis, daim ntawv qhia txog kev ntsuas tsis ua puas tsuaj (UT/RT).
Tom qab xyoo 2016, cov ntaub ntawv sim ntawm cov khoom sib xyaw tshiab (Ni, Cr, thiab lwm yam) yuav tsum suav nrog.
Kev tshuaj xyuas dua los ntawm lwm tus neeg
Nws raug pom zoo kom rov tshuaj xyuas cov khoom tseem ceeb (xws li kev sim kev cuam tshuam, cov tshuaj lom neeg sib xyaw) los ntawm kev kuaj, tshwj xeeb tshaj yog rau cov ntawv thov muaj kev pheej hmoo siab (xws li LNG pipelines).
Qhov kub thiab txias
Tsim qhov kub ua haujlwm ≥-45 ℃, cov xwm txheej kub qis heev (xws li -195 ℃) yuav tsum tau soj ntsuam seb puas xav tau qib siab dua (xws li A333GR3 / GR8).
Daim ntawv thov kev lag luam
Petrochemical (ethylene, LNG), cov khoom siv tub yees, cov kav dej cryogenic, thiab lwm yam, yuav tsum xav txog kev tiv thaiv ntxiv (xws li txheej) raws li qhov corrosiveness ntawm cov khoom nruab nrab.
Kev tsim nyog thiab kev ua tau zoo
Xaiv cov chaw tsim khoom uas muaj cov ntawv pov thawj tsim khoom ASTM A333, thiab xav tau cov ntaub ntawv xa khoom rau cov haujlwm zoo sib xws.
Ceev faj txog tus cwj pwm "OEM" ntawm cov tub luam thiab xyuas kom meej cov ntaub ntawv lav thawj ntawm lub Hoobkas.
Nqe thiab lub sijhawm xa khoom
Cov qauv qis-alloy (ua ntej xyoo 2016) yuav muaj tus nqi qis dua, tab sis qhov sib txawv ntawm kev ua tau zoo yog qhov loj, thiab qhov kev ua tau zoo tag nrho yog qhov xav tau.
Tej zaum yuav xav tau kev hloov kho tshwj xeeb (xws li cov kav dej loj uas muaj phab ntsa tuab) kom ntev lub voj voog xa khoom.
Kev pheej hmoo ntawm kev tsis meej pem: Tsis txhob yuam kev A333GR6 nrog A335GR6 (chromium-molybdenum hlau rau qhov kub siab).
Cov khoom lag luam txheem qub: Paub meej tias cov yeeb nkab hlau puas tau tsim tawm tom qab xyoo 2016 kom tsis txhob muaj cov khoom sib xyaw ntawm cov khoom txheem qub uas tsis ua raws li cov qauv.
Cov txheej txheem vuam: Kev vuam cov yeeb nkab hlau uas kub tsawg yuav tsum tau cov ntaub ntawv vuam sib phim (xws li ENiCrMo-3), thiab tus neeg muag khoom yuav tsum muab cov lus qhia vuam.
Los ntawm cov ntsiab lus saum toj no, tus neeg yuav khoom tuaj yeem soj ntsuam qhov ua raws li txoj cai, kev sib phim ua tau zoo thiab kev ntseeg siab ntawm tus neeg muab khoom ntawm A333GR6 alloy yeeb nkab kom ntseeg tau tias muaj kev nyab xeeb thiab kev lag luam ntawm qhov project.
Lub sijhawm tshaj tawm: Lub Rau Hli-12-2025
