Dab tsi yog cov yam ntxwv ntawm SA387 Qib 11 Chav Kawm 2?
SA387 Qib 11 Chav Kawm 2 yog ib qho qub thiab tempered chromium-molybdenum (Cr-Mo) alloy steel phaj tshwj xeeb tsim los rau kev tsim kho cov hlab ntsha siab thiab siab -kub cov khoom hauv kev xav tau kev pabcuam.
Cov khoom siv kho tshuab ntawm SA387 Qib 11 Chav Kawm 2 yog txhais los ntawm nws qhov xwm txheej thiab tempered (N&T) thiab tau teev tseg hauv ASTM / ASME A / SA387 tus qauv. Cov xwm txheej no muab kev sib npaug ntawm lub zog, ductility, thiab toughness haum rau siab - kub siab lub nkoj tsim.
1. Yam tsawg kawg nkaus uas yuav tsum tau muaj cov cuab yeej cuab tam (chaw kub)
| Khoom | Tus nqi (yam tsawg los yog ntau yam) | Metric Units | Imperial Units |
|---|---|---|---|
| Tensile zog (Rm) | 485-620 MPa | 485-620 MPa | 70,000-90,000 psi |
| Yield zog (Rp0.2) | Tsawg kawg 275 MPa | ≥275 MPa | ≥ 40,000 psi |
| Elongation (A) | Tsawg kawg 20% | ≥ 20% (hauv 50 hli ntsuas qhov ntev) | ≥ 20% (hauv 2 nti ntsuas qhov ntev) |
Nco tseg: Cov no yog qhov tsawg kawg nkaus qhov tseem ceeb ntawm daim ntawv pov thawj cov khoom siv. Cov nqi tiag tiag feem ntau poob rau hauv nruab nrab - mus rau - qhov siab.
2. Yam Khoom Ntxiv
Hardness: Feem ntau ntawm 140-207 HBW (Brinell Hardness). Txoj kev kho N&T zam tsis dhau hardness uas tuaj yeem cuam tshuam qhov weldability lossis toughness.
Impact Toughness: Charpy V-Kev ntsuas qhov cuam tshuam tsis yog qhov yuav tsum tau ua ntawm lub hauv paus specification tab sis yuav luag ib txwm teev rau kev siv lub nkoj siab. Cov kev xav tau ntawm tus neeg yuav khoom yog:
Kev ntsuas kub: +10° F txog -20 ° F (-12 ° C txog -29 ° C) lossis qis dua.
Yam tsawg kawg nkaus absorbed zog: 20 J (15 ft-lbf) nruab nrab ib pawg ntawm peb cov qauv.
3. Kev sib piv tseem ceeb nrog Chav Kawm 1 (Annealed)
Lub hauv paus yog vim li cas rau kev qhia txog Chav Kawm 2 dhau Chav Kawm 1 yog nws qhov zoo tshaj li - xa lub zog:
Yield Strength: Chav Kawm 2 muaj qhov tsawg kawg nkaus lub zog ntawm 275 MPa (40 ksi), uas yog kwv yees li 34% siab dua li Chav Kawm 1 qhov tsawg kawg nkaus ntawm 205 MPa (30 ksi).
Tensile Strength: Class 2's tensile range (485-620 MPa) siab dua Class 1's (415-585 MPa).
Lub zog siab dua no tso cai rau cov neeg tsim qauv siv cov txiaj ntsig kev ntxhov siab siab dua (raws li ASME Tshooj II, Ntu D) hauv kev suav, uas ua rau cov phab ntsa nyias nyias.
4. Siab -Tub (Ceep) Properties
Rau siab - kev pabcuam kub (txog ~ 595 ° C / 1100 ° F), cov khoom tsim tshwj xeeb yog Creep Strength thiab Stress Rupture Strength. Cov no yog tswj hwm los ntawm 1.25% Cr thiab 0.5% Mo muaj pes tsawg leeg thiab zoo ib yam rau ob Chav Kawm 1 thiab Chav Kawm 2 tom qab kev kho cua sov kom zoo. ASME Code muab tib qhov kev ntxhov siab ntau tshaj plaws rau ob chav kawm ntawm txhua qhov kub.
5. Cov ntsiab lus tseem ceeb: Lub luag haujlwm ntawm Kev Tshaj Tawm -Kev kho cua sov (PWHT)
Tom qab fabrication, tag nrho cov weldments yuav tsum tau ib tug yuav tsum tau PWHT (feem ntau ~ 620-690 ° C / 1150-1275 ° F).
Qhov no PWHT me ntsis tempers cov khoom, uas tej zaum yuav ua rau ib tug me me txo nyob rau hauv yield thiab tensile lub zog (piv rau cov as{0}}muab qhov tseem ceeb) tab sis yog ib qho tseem ceeb rau:
Relieving residual stresses.
Txhim kho corrosion kuj nyob rau hauv tshav kub- cuam tshuam cheeb tsam.
Ua kom muaj kev ruaj ntseg zoo.
Tus tsim qauv siv ASME cov txiaj ntsig kev ntxhov siab (uas yog tus account rau qhov xwm txheej kawg no) rau kev suav, tsis yog daim ntawv pov thawj zeb nyoos.
Summary of Mechanical Property Philosophy
Cov khoom siv kho tshuab ntawm SA387 Qib 11 Chav Kawm 2 sawv cev rau kev sib npaug zoo rau kev tsim cov hlab ntsha siab:
Muaj zog txaus rau kev ua haujlwm zoo, lub teeb yuag tsim.
Txaus Ductility thiab Toughness los tiv thaiv fabrication thiab tiv thaiv brittle puas.
Stable Elevated -Kev Ua Haujlwm Kub Ua Haujlwm rau lub sijhawm ntev- kev pabcuam hauv cov chaw tsim khoom thiab cov chaw tsim hluav taws xob.
Nyob rau hauv qhov tseeb, cov khoom no ua rau nws lub neej ntawd, siab -kev xaiv rau feem ntau tshiab kev tsim kho ntawm 1.25Cr-0.5Mo alloy siab hlab ntsha.
1. SA387 Qib 11 Chav Kawm 2 yog dab tsi?
SA387 Qib 11 Chav Kawm 2 yog ib qho qub thiab tempered chromium-molybdenum (1¼Cr-½Mo) alloy steel phaj tsim los rau siab -kub siab cov hlab ntsha, muab lub zog siab dua li Chav Kawm 1 thaum tswj kev zoo weldability thiab creep kuj nyob rau hauv refinery kev pab cuam.
2. Cov khoom siv kho tshuab ntawm SA387 Qib 11 Chav Kawm 2 yog dab tsi?
Nyob rau hauv nws qhov normalized thiab tempered mob, SA387 Qib 11 Chav Kawm 2 muab lub zog tensile ntawm 485–620 MPa (70–90 ksi) thiab qhov tsawg kawg nkaus tawm lub zog ntawm 275 MPa (40 ksi), ua rau nws haum rau siab - kev nyuaj siab, elevated - kub tsim
3. SA387 Qib 11 Chav Kawm 2 txawv li cas ntawm Chav Kawm 1?
Class 2 yog normalized thiab tempered rau siab dua li -suplied zog, thaum Class 1 yog annealed rau siab tshaj formability; ob leeg sib koom tib yam tshuaj muaj pes tsawg leeg tab sis raug xaiv raws li fabrication xav tau kev pab thiab tsim kom muaj kev ntxhov siab.
4. Qhov kev pabcuam siab tshaj plaws rau SA387 Qib 11 Chav Kawm 2 yog dab tsi?
SA387 Qib 11 Chav Kawm 2 feem ntau yog siv hauv kev pabcuam txuas mus txog li 595 ° C (1100 ° F), qhov twg nws cov ntsiab lus chromium thiab molybdenum muab kev tiv thaiv zoo rau oxidation thiab hydrogen nres.
5. Dab tsi yog cov ntawv thov rau SA387 Qib 11 Chav Kawm 2 daim hlau?
Qib no yog siv dav hauv hydrotreaters, hydrocrackers, heat exchangers, thiab lwm yam siab -kub siab hlab ntsha nyob rau hauv petrochemical refineries thiab fais fab - tiam.
6. Cov txheej txheem vuam dab tsi yuav tsum tau ua rau SA387 Qib 11 Chav Kawm 2?
Vuam yuav tsum tau qis -hydrogen electrodes, preheating (150–205 ° C / 300-400 ° F), thiab yuav tsum tau post-weld heat treatment (PWHT) nyob ib ncig ntawm 620-690 ° C (1150-1275 ° F) los tiv thaiv kev tawg thiab rov ua kom corrosion.
7. Qhov sib npaug European qib rau SA387 Qib 11 Chav Kawm 2 yog dab tsi?
Qhov sib npaug nyob sab Europe zoo tshaj plaws yog 13CrMo4-5 (1.7335) raws li EN 10028-2, uas muaj cov khoom sib xws thiab feem ntau muab nkag rau hauv ib qho xwm txheej thiab tempered.
8. SA387 Qib 11 Chav Kawm 2 piv rau Qib 22 li cas?
Qib 11 (1.25Cr-0.5Mo) muaj qis dua siab -kub lub zog thiab hydrogen tsis kam tshaj Qib 22 (2.25Cr-1Mo), ua rau nws muaj txiaj ntsig zoo rau kev pabcuam nruab nrab-qhov hnyav hauv kev ua kom zoo thiab cov txheej txheem tshuaj.
9. Charpy cuam tshuam dab tsi rau SA387 Qib 11 Chav Kawm 2 yog dab tsi?
Charpy V-notch impact test feem ntau teev los ntawm cov neeg yuav khoom; Cov kev xav tau ib txwm yog 20 J (15 ft-lb) qhov nruab nrab qhov nruab nrab ntawm qhov kub ntawm +10 ° F thiab -20 ° F (-12 ° C txog -29 ° C) rau kev siv lub nkoj siab.
10. Qhov txawv ntawm SA387 Qib 11 Chav Kawm 2 thiab AISI 4130 yog dab tsi?
Thaum ob qho tib si yog Cr-Mo steels, SA387 Qib 11 Chav Kawm 2 yog cov khoom siv phaj rau cov hlab ntsha siab nrog cov kev cai nruj thiab kev sim, qhov AISI 4130 yog lub hom phiaj dav dav / bar alloy nrog cov khoom sib txawv thiab kev siv.
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.
