Dab tsi yog Tso Cai Kev Nyuaj Siab?
Kev ntxhov siab tso cai yog qhov kev ntxhov siab siab tshaj plaws uas cov khoom siv tuaj yeem nqa tau ntev - kev pabcuam lub sijhawm thaum khaws cov npoo kev nyab xeeb tiv thaiv kev tawm los thiab tawg. Nws yog tsim los ntawm tus qauv tsim, tsis yog los ntawm cov khoom siv, thiab nws tsim lub hauv paus ntawm phab ntsa - thickness thiab siab- ntsuas ntsuas rau cov kav dej thiab cov hlab ntsha. Rau qis-kub carbon steel yeeb nkab xws li ASTM A333 Qib 6, qhov kev ntxhov siab tso cai yuav tsum tau nyeem los ntawm cov lus teev rau qhov ntsuas kub.
Khoom siv hauv paus ntawm A333 Qib 6
ASTM A333 Qib 6 yog ib tug tua- carbon steel seamless los yog welded yeeb nkab nrog ib tug tsawg kawg nkaus yield zog ntawm 240 MPa thiab ib tug tsawg kawg nkaus tensile zog ntawm 415 MPa. Nws yog Charpy cuam tshuam kuaj ntawm -45 degrees Celsius, uas tsim nyog rau nws rau kev pabcuam txias mus rau qhov kub ntawd. Cov qib yog dav siv rau qis-kub txheej txheem piping, cia-tank txuas kab, tshav kub exchangers thiab tub yees tshuab.
| Khoom | A333 Qib 6 Yuav Tsum Tau |
|---|---|
| Yield zog, yam tsawg kawg nkaus | 240 MPa (35,000 psi) |
| Tensile zog, yam tsawg kawg nkaus | 415 MPa (60,000 psi) |
| Charpy impact test | Ntawm -45 ° C (-50 ° Fahrenheit) |
| Cov ntsiab lus carbon | 0.30% siab tshaj |
| Manganese cov ntsiab lus | 0.29-1.06% |
Tso cai Stress Values
Hauv ASME system, qhov yooj yim tso cai rau kev ntxhov siab yog qhov tsawg dua ntawm ib feem peb ntawm qhov tsawg kawg nkaus tensile lub zog thiab ob feem peb ntawm qhov tsawg kawg nkaus yield zog ntawm chav tsev kub. Rau A333 Qib 6, ib feem peb ntawm 415 MPa yog hais txog 138 MPa thiab ob feem peb ntawm 240 MPa yog 160 MPa, yog li cov txheej txheem tensile tswj thiab tus nqi tabulated hauv ASME B31.3 Table A-1 thiab ASME Tshooj II Part D yog kwv yees li 20,000 psi, Suav siab piping thiab nkoj lis dej num, xws li GB / T 20801 thiab GB 150, luam tawm ib qho piv txwv ntawm chav tsev-kub uas tso cai rau kev ntxhov siab txog 135 MPa rau tib yam khoom.
| Code System | Ambient Allowable Stress | Hauv paus |
|---|---|---|
| ASME B31.3 / ASME BPVC Tshooj II Part D | 20.0 ksi, txog 138 MPa | Yam tsawg kawg tensile zog muab faib los ntawm 3 |
| GB / T 20801 / GB 150 series | Txog 135 MPa | Suav code kev nyab xeeb yam thiab cov rooj kub |
Temperature Effects thiab Low-Tsub Cov Cai
Tso cai rau kev ntxhov siab yog qhov ua haujlwm ntawm qhov kub thiab txias. Ntawm qhov kub siab, tus nqi txo qis thaum lub zog poob, thiab cov lus teev code yuav tsum tau nyeem ntawm qhov ntsuas qhov tseeb. Rau kev pabcuam txias, qhov txwv tseem ceeb tsis yog qhov kev ntxhov siab tso cai tab sis qhov tsawg kawg nkaus tsim hlau kub. A333 Qib 6 raug kuaj ntawm -45 degrees Celsius; Hauv qab no qhov ntsuas kub ntawm txoj cai yuav tsum muaj rooj plaub-los ntawm- qhov ntsuas qhov ntsuas, ntsuas qhov cuam tshuam ntxiv lossis lwm yam khoom siv xws li A333 Qib 3. Hauv kev tsim qauv ntsuas kub qis, qhov ntsuas qhov kev ntxhov siab nyob ib puag ncig feem ntau yog tus tswj hwm rau cov pa roj carbon steel.
Yuav siv tus nqi li cas hauv kev tsim
Hauv ASME B31.3 qhov tsawg kawg nkaus uas yuav tsum tau muaj phab ntsa tuab rau lub siab sab hauv yog xam nrog qhov yooj yim tso cai kev ntxhov siab S los ntawm Table A-1, nrog rau kev tsim siab, txoj kab uas hla sab nraud thiab qhov sib koom ua ke thiab casting zoo yam. Tus tsim qauv xaiv qhov ntsuas kub tsim thiab nyeem tus nqi S sib raug, tom qab ntawd siv tus lej lej. Rau Suav cov qauv tsim, cov lus tso cai rau kev ntxhov siab sib xws hauv GB / T 20801 yog siv tib yam. Hauv ob qho tib si cov yeeb nkab txheem A333 lossis SA-333 yuav tsum muaj npe nyob rau hauv cov ntaub ntawv tshwj xeeb kom daim ntawv pov thawj zeb phim cov khoom siv hauv cov cai.
Kev Ntseeg Tsis Zoo
Tso cai kev ntxhov siab tsis yog cov khoom vaj khoom tsev luam tawm ntawm daim ntawv pov thawj zeb; nws yog tus lej- muab tus nqi tsim tawm. Qhov kev nyab xeeb tsis yog siv los ua ib qho sib npaug ntawm 0.4 raws li qee zaum pom hauv cov ntaub ntawv yooj yim; tus nqi ASME yog muab los ntawm lub zog tensile muab faib los ntawm 3 ntawm chav tsev kub. Qhov kev ntxhov siab uas tso cai tsis tuaj yeem txo qis qis dua -45 degrees Celsius; txoj cai txwv ntawm qhov kub qis heev yog qhov tsawg kawg nkaus tsim hlau kub thiab qhov cuam tshuam - qhov kev xeem yuav tsum tau ua, tsis yog qhov poob siab tso cai. Thaum kawg, tus nqi ntawm chav tsev kub yuav tsum tsis txhob siv qhov muag tsis pom ntawm 300 degrees Celsius, qhov twg lub rooj code twb teev tus lej qis dua.
FAQ
Dab tsi yog qhov tso cai rau kev ntxhov siab rau A333 Qib 6 yeeb nkab?
Hauv ASME B31.3 Table A-1 chav-kub tso cai rau kev ntxhov siab rau SA-333 Qib 6 yog 20,000 psi, txog 138 MPa. Suav cov lej teev txog 135 MPa.
Yuav ua li cas yog tus nqi 138 MPa?
Nws yog ib feem peb ntawm qhov tsawg kawg nkaus tensile zog ntawm 415 MPa. Cov txiaj ntsig - lub zog ntsuas ntawm ob feem peb ntawm 240 MPa muab 160 MPa, yog li cov txheej txheem tensile tswj hwm.
Puas tso cai rau kev ntxhov siab hloov nrog qhov kub thiab txias?
Yog lawm. Nyeem tus nqi los ntawm cov lus code ntawm qhov ntsuas kub tsim. Rau cov pa roj carbon steel, qhov ntsuas kub siab txo qhov tso cai rau kev ntxhov siab; rau kev pabcuam txias tus nqi ambient feem ntau tswj hwm.
A333 Qib 6 puas tuaj yeem siv qis dua -45 degrees Celsius?
Tsis yog ib yam khoom catalog. Qhov kev tsim nyog Charpy yog nyob ntawm -45 degrees Celsius, yog li cov kev pabcuam txias dua yuav tsum tau ntsuas cov ntaub ntawv lossis qib siab dua-alloy xws li A333 Qib 3.
Dab tsi yog qhov kev nyab xeeb tom qab ASME tus nqi?
Nyob rau hauv chav tsev kub qhov yooj yim kev ntxhov siab yuav siv qhov tsawg kawg nkaus tensile lub zog muab faib los ntawm 3, nrog rau ob -feem peb- ntawm - tawm tswv yim ntsuas nyob rau hauv parallel.
Vim li cas ASME thiab GB tus nqi sib txawv?
Suav cov lej siab siv lawv tus kheej cov yam ntxwv kev nyab xeeb thiab cov ntxhuav kub, uas tawm los txog 135 MPa rau tib yam khoom ntawm qhov kub thiab txias.