A387 Gr 22 CL 1 Veseel Steel Phaj

ASTM A387 Qib 22 Chav Kawm 1yog ib hom chromium-molybdenum (Cr-Mo) alloy steel phaj tsim rau welded boilers thiab siab -kub siab cov hlab ntsha, muab zoo siab - kub lub zog thiab corrosion kuj, nrog "Class 1" qhia tus qauv tensile lub zog theem thiab haum rau daim ntaub ntawv uas qis dua - qhov kub thiab txias, tsis zoo li qhov kub thiab txias. Nws muaj kwv yees li 2.25% chromium thiab 1.00% molybdenum, ua rau nws zoo tagnrho rau petrochemical, roj & roj, thiab hluav taws xob tsim kev lag luam.

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Kev kho cua sov yuav tsum tau

Raws li kev cai thiab tempering feem ntau yuav tsum tau rau A387 Qib 22 Chav Kawm 1 daim hlau.

Normalization feem ntau ua nyob rau hauv qhov kub ntawm 900 txog 950 degree, ua raws li cua txias.

Tempering yog nqa tawm ntawm qhov kub thiab txias feem ntau ntawm 620 thiab 700℃kom ua tiav qhov yuav tsum tau ua kom tawv thiab txo cov kev ntxhov siab.

Quenching thiab Tempering (Q&T) Kev xaiv

Qee qhov kev qhia tshwj xeeb lossis cov neeg yuav khoom yuav tsum tau tso cai lossis qhia meej quenching thiab tempering es tsis txhob normalization thiab tempering.

Quenching yog ua los ntawm austenitizing kub (feem ntau 880 txog 920 degree) siv dej los yog roj.

Tempering tom qab quenching yog ib qho tseem ceeb los txhim kho toughness thiab txo hardness kom tau raws li qhov yuav tsum tau muaj nyob rau hauv chav kawm 1.

Yam yuavtsum tau muaj kev xeem rau hoob 1

A387 Qib 22 Chav Kawm 1 yuav tsum tau Charpy V- ntsuas qhov cuam tshuam ntawm qhov ntsuas kub (feem ntau 0℃lossis qis dua, nyob ntawm qhov kev txiav txim yuav khoom lossis tsim qauv).

Qhov cuam tshuam lub zog qhov tseem ceeb yuav tsum ua kom tau raws li qhov yuav tsum tau muaj tsawg kawg nkaus teev hauv ASTM A387 kom ntseeg tau tias muaj zog txaus rau qhov qis - kub lossis siab - kev pabcuam kev ntxhov siab.

Kev txiav txim siab vuam

Preheating feem ntau pom zoo ua ntej vuam los tiv thaiv kev sib tsoo txias, feem ntau nyob rau hauv thaj tsam ntawm 200 txog 300 degree.

Kev tswj qhov kub thiab txias yog qhov tseem ceeb thaum lub sij hawm vuam kom tsis txhob muaj cua sov ntau dhau thiab tswj cov khoom siv tshuab.

Tom qab-weld heat treatment (PWHT) feem ntau yog yuav tsum tau rau cov khoom siv welded, feem ntau ntawm qhov kub ntawm 620 thiab 680℃, kom txo cov tawv tawv hauv tshav kub- thaj tsam cuam tshuam (HAZ) thiab txo cov kev ntxhov siab welding.

Chemical Composition Control

Kev tswj nruj ntawm cov pa roj carbon, chromium, molybdenum, thiab lwm yam alloying yog tsim nyog los xyuas kom meej lub zog xav tau, toughness, thiab creep kuj.

Kev sib xyaw ua ke yuav tsum ua raws li cov kev txwv hauv ASTM A387 rau Qib 22.

Mechanical Property Requirements

Tensile zog, yield zog, elongation, thiab txo qhov chaw yuav tsum tau raws li qhov tsawg kawg nkaus tus nqi teev nyob rau hauv tus qauv.

Rau Chav Kawm 1, kev saib xyuas tshwj xeeb yog them rau cov kev cuam tshuam toughness, uas yog qhov tseem ceeb sib txawv ntawm Chav Kawm 2.

Kev tshuaj xyuas thiab kuaj

Kev kuaj ultrasonic (UT) feem ntau yuav tsum tau siv rau cov phaj siv hauv kev siv cov hlab ntsha tseem ceeb.

Kev tshuaj xyuas qhov muag (VI), kev tshuaj ntsuam xyuas qhov sib nqus (MPI), lossis kev tshuaj ntsuam xyuas cov kua dej (LPI) tuaj yeem ua raws li cov lus qhia lossis cov neeg yuav khoom yuav tsum tau ua.

Kev ntsuam xyuas hardness feem ntau yog ua los xyuas kom meej tias cov khoom siv tsis pub dhau qhov siab tshaj plaws uas tuaj yeem ua kom tawv tawv tom qab kev kho cua sov lossis vuam.

Cov Ntawv Thov Kev Lag Luam tseem ceeb

Petrochemical & Chemical processing:

Siv dav dav rau siab -siab reactors, separators, thiab cia cov hlab ntsha uas tswj cov tshuaj volatile processing media thiab qaub roj.

Roj & Roj Kev Lag Luam:

Qhov zoo tshaj plaws rau qhov kev pabcuam qaub vim nws tsis kam rau hydrogen-induced cracking thiab stress corrosion. Nws yog siv nyob rau hauv ob qho tib si offshore thiab onshore piping, siab hlab ntsha, thiab cov khoom siv roj.

Lub zog tiam:

Pom muaj nyob rau hauv thermal thiab nuclear fais fab nroj tsuag rau boiler nruas, superheater raj, thiab cov khoom siv rauv. Nws tuav cov txheej txheem kev ncaj ncees nyob rau hauv lub sij hawm ntev thermal stress ntawm siab -siab chav.

Cov khoom siv hluav taws xob hloov hluav taws xob:

Feem ntau ua hauj lwm hauv cov boilers muaj boilers, tshav kub exchangers, thiab condensers uas yuav tsum tau tiv thaiv tas mus li thermal cycling.

Hu rau tam sim no

Yog xav paub ntxiv txog GNEE cov khoom siv hlau, tiv tauj peb ntawm beam@gneesteelgroup.com. Peb tos ntsoov yuav ua haujlwm nrog koj.

A387 Qib 22 Chav Kawm 1 yog dab tsi?

Nws yog qis- alloy ferritic steel phaj rau cov hlab ntsha siab, muaj 2.25% chromium thiab 1% molybdenum. Tsim los rau siab - kev pabcuam kub, nws muaj kev nkag tau zoo heev thiab oxidation tsis kam, dav siv hauv petrochemical thiab fais fab kev lag luam.

Dab tsi yog cov tshuaj muaj pes tsawg leeg ntawm A387 Qib 22 Chav Kawm 1?

Nws cov ntsiab lus tseem ceeb yog 2.00-2.50% Cr, 0.87-1.13% Mo, Tsawg dua lossis sib npaug rau 0.17% C, Tsawg dua lossis sib npaug li 0.50% Si, 0.40-0.65% Mn, nrog cov kab P thiab S. Cov ntsiab lus no txhim khu kev tiv thaiv corrosion siab.

Qhov kev pabcuam siab tshaj plaws ntawm A387 Qib 22 Chav Kawm 1 yog dab tsi?

Nws tuaj yeem tiv taus kev pabcuam txuas mus txog 593℃(1100℃F). Tshaj li qhov ntsuas kub no, nws lub zog creep poob qis heev, ua rau nws tsis tsim nyog rau kev ua haujlwm ntev - lub sij hawm siab - kub.

Yuav tsum tau kho cua sov dab tsi rau A387 Qib 22 Chav Kawm 1?

Nws feem ntau undergoes normalizing (899-954 degree) ua raws li tempering (677-760 degree). Cov txheej txheem no refines nplej, txo cov kev ntxhov siab sab hauv, thiab optimizes nws cov cuab yeej cuab tam rau kev siv lub nkoj siab.

Lub zog tensile ntau ntawm A387 Qib 22 Chav Kawm 1 yog dab tsi?

Lub zog tensile yam tsawg kawg nkaus yog 415 MPa (60 ksi), thiab lub zog tawm los yog tsawg kawg yog 205 MPa (30 ksi). Nws sib npaug ductility thiab lub zog, ua tau raws li cov qauv tsim ntawm lub nkoj siab.

Puas yog A387 Qib 22 Chav Kawm 1 weldable?

Yog lawm, nws yog weldable ntawm ntau txoj kev xws li SMAW, GTAW, thiab GMAW. Preheating (150{2}}260 degree) thiab kev kho cua sov tom qab vuam (PWHT) yog qhov tsim nyog los tiv thaiv qhov txias txias thiab txo qhov kev ntxhov siab.

Dab tsi yog qhov corrosion kuj ntawm A387 Qib 22 Chav Kawm 1?

Nws tiv taus oxidation thiab sulfidation hauv siab - qhov kub thiab txias. Txawm li cas los xij, nws tsis haum rau muaj zog acidic lossis chloride - muaj cov xov xwm, vim nws tsis muaj kev tiv thaiv corrosion txaus nyob rau hauv cov xwm txheej zoo li no.

Dab tsi yog kev lag luam feem ntau siv A387 Qib 22 Chav Kawm 1?

Nws yog dav siv nyob rau hauv petrochemical, refinery, lub zog tsim hluav taws xob (boilers, turbines), thiab tshuaj ua lag luam, feem ntau rau cov hlab ntsha siab, kub exchangers, thiab piping systems.

A387 Qib 22 Chav Kawm 1 txawv li cas A387 Qib 12 Chav Kawm 1?

Qib 12 muaj 1% Cr thiab 0.5% Mo, yog li Qib 22 muaj ntau dua Cr-Mo cov ntsiab lus. Qib 22 muaj qhov zoo dua siab dua - kub lub zog thiab corrosion kuj, haum rau cov kev pabcuam hnyav dua li Qib 12.