Dab tsi L485 Kab Yeeb Khoom Siv yog
L485 kab yeeb nkab yog siab -lub zog qis- alloy steel yeeb nkab qib tau teev tseg hauv GB / T 9711, Suav tus qauv rau cov yeeb nkab steel siv nyob rau hauv cov kav dej thauj mus los hauv kev lag luam roj av thiab cov nkev. Tus lej qib sib npaug ntawm qhov tsawg kawg nkaus qhov kev tawm dag zog hauv megapascals, yog li L485 yeeb nkab yuav tsum ncav cuag tsawg kawg yog 485 MPa ntawm cov khoom tawm. Hauv qib- cov ntsiab lus sib npaug nws zaum hauv tib chav kawm muaj zog raws li qib API 5L X70, cov hlau ua haujlwm ntev -nruab deb, siab- cov kab xa hluav taws xob siab.
Chemical Composition Limits
Cov pa roj carbon monoxide txhob txwm ua kom qis kom cov cua sov- cuam tshuam thaj tsam ntawm thaj chaw weld nyob ruaj khov, thaum phosphorus thiab sulfur raug txwv los tiv thaiv ductility thiab tiv thaiv hydrogen-induced cracking. Cov kev txwv tshwj xeeb rau L485 puag hlau yog:
| Element | Qhov siab tshaj plaws, % | Muaj nuj nqi |
|---|---|---|
| Cov pa roj carbon | 0.18 | Lub zog thiab weldability sib npaug |
| Silicon | 0.45 | Deoxidation |
| Manganese | 1.80 | Khoom- daws teeb meem |
| Phosphorus | 0.025 | Residual tswj |
| Sulfur | 0.015 | Residual tswj |
Lub zog siab tshaj ntawm theem pib yog tau los ntawm micro-alloying nrog niobium, vanadium los yog titanium ua ke nrog kev tswj dov, yog li cov pa sib npaug sib npaug qis thiab cov yeeb nkab tseem txuas tau hauv thaj teb.
Mechanical Properties
Lub zog tensile ntawm L485 kab yeeb nkab yog lub zog ntawm 485 MPa rau 635 MPa thiab lub zog tensile ntawm 570 MPa rau 760 MPa. Vim tias lub zog siab tshaj plaws yog capped thaum lub zog tensile muaj tus nqi hauv pem teb, yield - rau - tensile ratio yog tswj, uas txwv qhov kev pheej hmoo ntawm qis - lim tsis ua hauj lwm nyob rau hauv ib tug pressurized kab. elongation, cuam tshuam lub zog thiab, qhov twg tau teev tseg, hardness lossis poob{10}} qhov hnyav yuav tsum tau ua raws li qhov kev xa khoom tau pom zoo raws li GB/T 9711.
Tej kev siv
L485 yeeb nkab yog siv rau siab - cov roj thiab roj cov kab hauv siab, cov kab sib sau ua ke thiab cov kav dej hauv chaw nres tsheb qhov twg cov phab ntsa nyias dua li qib qis yuav tso cai rau muaj kev cuam tshuam ncaj qha rau tag nrho cov tonnage thiab vuam nqi. Kev siv cuam tshuam suav nrog cov txheej txheem tshuaj piping, fais fab nroj tsuag circulating kab thiab structural raj rau loj - ncua kev tsim kho.
Vuam, dabtsi yog khoov thiab soj ntsuam
Cov pa roj carbon tsawg thiab tswj cov pa sib npaug muab L485 zoo weldability. Preheat feem ntau yog siv rau cov phab ntsa tuab, cov hauv paus hla yog ua nrog qhov sib piv qis - hydrogen consumables, thiab cov cua kub tswj tau tswj kom qhov ntxhib - cov cua sov- thaj tsam cuam tshuam khaws nws cov toughness. Txias teb bending yuav tsum hwm qhov tsawg kawg nkaus khoov vojvoog thiab phab ntsa -thinning txwv ntawm qhov project specification. Txhua qhov ntev yog ib txwm xa nrog kev ntsuas hydrostatic, kev kuaj xyuas qhov ntev thiab, qhov twg yuav tsum tau, ultrasonic lossis radiographic tshuaj xyuas ntawm longitudinal weld.
FAQ
Q: L485 kab yeeb nkab yog dab tsi?
Nws yog ua los ntawm siab-lub zog qis- alloy steel nrog cov ntsiab lus siab tshaj plaws ntawm 0.18 feem pua, micro- alloyed nrog niobium, vanadium lossis titanium kom ncav cuag 485 MPa yam tsawg kawg nkaus lub zog.
Q: Puas yog L485 zoo ib yam li X70?
Ob qib nyob hauv tib chav kawm muaj zog thiab feem ntau sib pauv hauv qhov kev qhia tshwj xeeb, tab sis lawv cov kev xav tau raug sau rau hauv cov qauv sib txawv, yog li cov ntsiab lus tshuaj thiab kev sim ntawm GB / T 9711 thiab API 5L yuav tsum muab piv ua ntej hloov.
Q: Lub zog tawm ntawm L485 yeeb nkab yog dab tsi?
Lub zog ua haujlwm tau teev tseg yog 485 MPa txog 635 MPa, nrog lub zog tensile sib xws ntawm 570 MPa rau 760 MPa.
Q: Vim li cas carbon txwv rau 0.18 feem pua?
Cov ntsiab lus ntawm cov pa roj carbon tsawg ua kom cov pa roj carbon sib npaug qis, uas txhim kho weldability thiab khaws cov cua sov- cuam tshuam rau qhov hnyav hauv cov kav dej ua tiav.
Q: Qhov luaj li cas thiab qhov kev xa khoom tuaj yeem muaj?
L485 yeeb nkab yog muab raws li seamless los yog welded yeeb nkab nyob rau hauv lub diameters, phab ntsa thicknesses thiab ntev tau pom zoo nrog tus neeg yuav khoom, nyob rau hauv lub PSL1 los yog PSL2 tus me nyuam mob GB/T 9711.
Q: Puas yog L485 xav tau preheating ua ntej vuam?
Preheat tsis yog ib txwm yuav tsum tau, tab sis nws yog ib txwm teev rau cov yeeb nkab phab ntsa hnyav lossis rau qhov kub thiab txias, vim nws ua kom txias txias thiab pab tiv thaiv kev nyuaj, tawg -rhiab microstructures.
