Cov kav dej hlau tsis muaj seamless ua los ntawmASTM A335 P11thiabASTM A335 P22yog siv dav hauv kev lag luam petrochemical thiab kev tsim hluav taws xob rau cov khoom siv kub thiab siab. Txawm hais tias ob qho tib si yog cov kav hlau chromium-molybdenum alloy uas tau teev tseg hauv ASTM A335 tus qauv, lawv qhia txog qhov sib txawv tseem ceeb hauv kev ua tau zoo thiab cov xwm txheej siv. Kev nkag siab txog qhov sib txawv no yog qhov tseem ceeb rau ob qho tib si kev tsim qauv engineering, kev xaiv cov khoom siv, thiab kev tswj xyuas zoo ntawm kev yuav khoom.

Cov tshuaj lom neeg sib xyaw ua ke yog qhov tseem ceeb uas ua rau ob yam khoom no sib txawv. ASTMA335 P11 yeeb nkabCov tshuaj lom neeg muaj li ntawm 1.00 txog 1.50 feem chromium thiab 0.44 txog 0.65 feem molybdenum. ASTM A335 P22, ntawm qhov tod tes, muaj cov khoom sib xyaw siab dua, nrog rau cov ntsiab lus chromium ntawm kwv yees li 1.90 txog 2.60 feem thiab cov ntsiab lus molybdenum txij li 0.87 txog 1.13 feem. Qhov sib txawv ntawm cov khoom no ncaj qha ua rau muaj qhov sib txawv tseem ceeb hauv lawv qhov kev ua haujlwm kub siab. P22 cov ntsiab lus chromium thiab molybdenum siab dua muab lub zog kub siab dua, tiv taus oxidation, thiab tiv taus creep.

Thaum nws los txog rau kev xaiv cov ntaub ntawv rau kev siv engineering, cov xwm txheej ntawm ob cov ntaub ntawv no sib txawv heev. P11 feem ntau yog siv rau hauv qhov kub thiab txias nruab nrab thiab qhov chaw siab thiab feem ntau pom muaj nyob rau hauv cov kav dej hauv cov chaw ua roj refining, cov kav dej superheater kub qis hauv cov chaw ua hluav taws xob boilers, thiab qee lub tshuab hloov pauv cua sov. Nws qhov kub tsim feem ntau yog qis dua 550 ° C. P22, ntawm qhov tod tes, yog tsim los rau cov chaw kub thiab siab dua thiab yog cov khoom siv nyiam rau cov kav dej superheater kub thiab rov ua kom sov hauv cov chaw ua hluav taws xob boilers, nrog rau cov kav dej kub thiab siab hauv kev lag luam petrochemical. Nws tswj cov khoom siv kho tshuab zoo heev thiab kev tiv thaiv corrosion ntawm qhov kub tsim ntawm 580 ° C thiab siab dua.

Thaum yuav ob yam khoom no, yuav tsum tau ua tib zoo saib xyuas qhov sib txawv ntawm lawv cov kev cai. Hais txog qhov sib txawv ntawm phab ntsa tuab, ob qho tib si ua raws li tib qhov kev kam rau siab uas tau teev tseg los ntawmASTM A335 tus qauvThaum yuav khoom, cov neeg muag khoom yuav tsum tau muab cov ntawv qhia txog kev tshuaj xyuas kom meej kom ntseeg tau tias qhov tuab ntawm phab ntsa sib xws ua tau raws li cov kev cai ntawm cov kav dej siab. Hais txog kev tswj cov tshuaj lom neeg, cov neeg ua haujlwm yuav khoom yuav tsum tshuaj xyuas cov ntawv pov thawj khoom kom ntseeg tau tias cov ntsiab lus ntawm cov khoom sib xyaw tseem ceeb xws li chromium thiab molybdenum ua tau raws li cov qauv. Tshwj xeeb tshaj yog, qhov yuav tsum tau ua ntawm molybdenum rau P22 yog siab dua li ntawm P11, uas yog qhov tseem ceeb rau kev ua kom muaj kev ua haujlwm kub siab. Ntxiv mus, thaum yuav khoom, kev kho cua sov tsim nyog yuav tsum tau xaiv raws li qhov chaw siv. Kev ua kom zoo thiab kev ua kom sov feem ntau yog qhov kev xaiv zoo tshaj plaws rau kev ua kom cov khoom siv ua haujlwm tau zoo.

Txawm hais tias ASTM A335 P11 thiab P22 koom nrog tib tsev neeg chromium-molybdenum alloy steel, P22 muaj kev ua haujlwm kub siab dua vim nws cov ntsiab lus ntau dua, uas ua rau muaj tus nqi yuav khoom ntau dua. Cov yam xws li qhov kub thiab txias ua haujlwm, cov yam ntxwv siab, cov yam ntxwv ntawm xov xwm, thiab cov peev nyiaj yuav tsum tau txiav txim siab tag nrho thaum lub sijhawm tsim qauv engineering thiab xaiv cov khoom siv. Thaum lub sijhawm yuav khoom, cov qauv zoo tseem ceeb xws li cov tshuaj lom neeg sib xyaw, cov khoom siv kho tshuab, thiab kev kam rau siab yuav tsum tau tswj hwm kom ntseeg tau tias cov khoom siv ua tau raws li cov qauv tsim thiab cov qauv kev nyab xeeb. Kev xaiv cov khoom siv kom raug thiab kev tswj hwm zoo ntawm kev yuav khoom nruj yog qhov tseem ceeb rau kev ua haujlwm ntev ntawm cov kav dej kub siab.