ASTM A387 Qib 11 Chav Kawm 1 Sib Piv Nrog Chav Kawm 2
ASTM A387 Qib 11 Chav Kawm 1 yog hais txog chromium-molybdenum (1.25% Cr, 0.5% Mo) alloy steel phaj rau cov hlab ntsha siab nkag rau hauv qhov normalized los yog kev ntxhov siab-relieved kub kho mob. Nws yog tsim los rau siab - qhov kub thiab txias qhov kev pab cuam uas tus fabricator yuav ua zaum kawg ncej-weld heat treatment (PWHT) tom qab tsim khoom, ua rau nws haum rau cov khoom uas yuav tsum tau dav tsim thiab vuam nyob rau hauv refineries thiab fais fab nroj tsuag.
ASTM A387 Qib 11 Chav Kawm 2yog tib yam chromium-molybdenum alloy muaj pes tsawg leeg tab sis nkag mus rau hauv qhov zoo li qub thiab tempered (los yog quenched thiab tempered) kev kho cua sov. Qhov no muab siab dua li - xa lub zog thiab kev ua kom zoo dua microstructure, ua rau nws tsim nyog rau cov ntawv thov uas qhov kawg PWHT los ntawm cov fabricator yog impractical los yog qhov siab dua cov cuab yeej cuab tam yog xav tau rau cov khoom tiav.
Qhov sib txawv tseem ceeb ntawm ASTM A387 Qib 11 Chav Kawm 1 thiab Chav Kawm 2 nyob rau hauv lawv cov kev kho cua sov thaum lub sij hawm muab phaj thiab cov khoom siv tshuab, uas txiav txim siab lawv txoj kev npaj tsim.
Ntawm no yog cov ncauj lus kom ntxaws sib piv:
| Feature | ASTM A387 Qib 11 Chav Kawm 1 | ASTM A387 Qib 11 Chav Kawm 2 |
|---|---|---|
| Kev kho cua sov | Li qub los yog kev nyuaj siab -Relieved | Normalized thiab Tempered (Quenched & Tempered kuj tso cai) |
| Raws li -Delivered Strength | Lub zog qis qis qis (205 MPa / 30 ksi). | Siab tshaj tawm lub zog tsawg kawg nkaus (240 MPa / 35 ksi). |
| Microstructure | Tsawg tsis zoo, lub xeev softer haum rau kev kho cua sov tom ntej. | Ntau refined, uniform, thiab ruaj khov tempered microstructure. |
| Thawj Fabrication Path | Npaj rau tus neeg tsim khoom los ua qhov kawg Post-Weld Heat Treatment (PWHT) ntawm lub nkoj ua tiav. | Feem ntau xaiv thaum tag nrho PWHT ntawm lub nkoj zaum kawg tsis ua tau lossis rau cov khoom siv yooj yim. |
| Lub ntsiab lus tseem ceeb rau kev xaiv | Xaiv thaum cov txheej txheem fabrication (vuam dav dav, kub sib sau) yuav tsum muaj qhov kawg, tag nrho PWHT los kho cov khoom, txo kev ntxhov siab, thiab ua kom muaj kev nyab xeeb. Lub phaj mob yog optimized rau qhov no. | Xaiv los muab siab dua, lav raws li - tau txais lub zog thiab cov khoom, feem ntau rau cov ntawv thov uas lub nkoj puv PWHT tsis siv tau lossis rau cov khoom hloov pauv uas phim cov khoom qub lub zog siab dua. |
Tswv yim Summary:
Xav txog Class 1 li "fabricator's grade." Nws tuaj txog hauv lub xeev softer, ntau malleable, npaj tau txiav, tsim, thiab welded. Tus neeg tsim khoom tom qab ntawd ua tiav qhov kawg, zoo ib yam PWHT ntawm tag nrho lub nkoj, uas ua raws li cov txheej txheem tempering, ua tiav cov khoom kawg uas xav tau, txo kev ntxhov siab, thiab tawv.
Xav txog Chav Kawm 2 raws li "kev ua tau zoo- qib kawm tiav." Lub tshuab steel twb tau ua tag nrho cov kev kho cua sov (tempering). Nws tuaj txog ntawm lub khw fabrication nrog lub zog siab dua thiab ruaj khov microstructure. Nws yog siv thaum lub nkoj zaum kawg tsis tuaj yeem ua rau tag nrho PWHT (xws li, vim qhov loj me, tsis muaj qhov cub, lossis cov khoom siv sab hauv) lossis thaum tus qauv tsim tshwj xeeb hu rau siab dua li - muab lub zog.
Hauv qhov tseeb, qhov kev xaiv tsis yog hais txog qhov zoo tab sis hais txog kev tsim khoom thiab kev ua haujlwm engineering. Chav Kawm 1 yog tsim los kom tau txais nws cov khoom kawglos ntawmtus fabricator's PWHT, thaum Chav Kawm 2 yog tsim los txog nrog nws cov khoom kawg loj heevxa tau.
A387 qib 11 yog dab tsi?
ASTM A387 specification yog tus qauv Specification rau Pressure Vessel Phaj, Alloy Steel, Chromium-Molybdenum npaj rau siv nyob rau hauv welded boilers thiab siab hlab ntsha tsim rau siab kub kev pab cuam. SSAB tuaj yeem muab A387 Qib 11 rau qhov kev xeem nruj rau Chav Kawm 1 thiab / lossis Chav Kawm 2.
Dab tsi yog qhov sib xyaw ntawm A387 steel?
Muaj pes tsawg leeg: ASTM A387 steel phaj feem ntau muaj chromium (txog 9% lossis ntau dua) thiab molybdenum (txog 2.25% lossis ntau dua), uas txhim kho lawv lub zog thiab corrosion kuj ntawm qhov kub thiab txias.
Qhov txawv ntawm A182 thiab A387 yog dab tsi?
Ob leeg ASTM A182 qib F11 chav kawm 2 thiab ASTM A387 qib 22 steel yog hlau alloys. Lawv muaj 99% siab heev ntawm lawv qhov nruab nrab alloy muaj pes tsawg leeg. Muaj 32 cov khoom siv nrog cov txiaj ntsig rau ob qho khoom siv. Cov khoom muaj txiaj ntsig rau ib qho khoom siv xwb (1, hauv qhov no) tsis qhia.
ASTM A387 Qib 11 sib npaug li cas?
ASTM A387 qib 11 sib npaug steel yog ASME SA387 qib 11. ASTM A387 qib 11 npog A387 qib 11 chav kawm 1 thiab A387 qib 11 chav kawm 2, uas sib npaug rau ASME SA387 qib 18 qib 71 thiab qib 12 raws.
Tag nrho cov specification thiab cov ntsiab lus muaj nyob rau ntawm kev thov. Cov ntaub ntawv saum toj no yog muab rau kev taw qhia nkaus xwb. Rau kev tsim tshwj xeeb thov hu rau peb cov neeg ua haujlwm muag khoom.
