ASTM A333 Qib 6 Pipes yog dab tsi?
ASTM A333 npog seamless thiab welded carbon thiab qis- alloy steel yeeb nkab npaj rau qis- qhov kub thiab txias. Cov qib uas tau teev tseg tshaj plaws yog Qib 6, cov pa roj carbon-manganese steel uas sib xyaw ua ke ntawm lub zog nruab nrab nrog kev txhim khu kev qha cuam tshuam rau qhov hnyav txog li -45 degree.
A333 Qib 6 yeeb nkab feem ntau piav raws li LTCS yeeb nkab hauv cov ntaub ntawv ua haujlwm, lub ntsiab lus qis -kub carbon steel. Nws yog muab nyob rau hauv lub normalized mob, uas refines lub grain qauv thiab txhim kho qis -kub ductility. Cov lus qhia tshwj xeeb yuav tsum muaj Charpy V- qhov ntsuas qhov cuam tshuam, feem ntau ntawm -50℃F (-45 degree), nrog rau qhov tsawg kawg nkaus absorbed zog feem ntau yog 20 ft-lbf (27 J) transverse los yog 25 ft-lbf (34 J) longitudinal, nyob ntawm seb qhov loj thiab phab ntsa thickness.
Chemical Composition Requirements
| Element (ntau%) | ASTM A333 Qib 6 txwv |
|---|---|
| Cov pa roj carbon (C) | 0.30 max |
| Manganese (Mn) | 0.29-1.06 Nws |
| Phosphorus (P) | 0.025 max |
| Sulfur (S) | 0.025 max |
| Silicon (Si) | 0.10 min |
Qib 6 tso siab rau cov pa roj carbon monoxide thiab manganese es tsis yog cov nickel ntxiv. Qhov txwv tsis pub muaj leej faj thiab phosphorus ua rau cov hlau txuas ntawm sub- xoom kub. Qhov twg qhov kev pabcuam txias hauv qab -45℃yuav tsum tau, Qib 3 nrog kwv yees li 3.5% npib tsib xee yog qhov kev xaiv ib txwm.
Mechanical Properties
| Khoom | Yam tsawg kawg nkaus |
|---|---|
| Yield zog | 240 MPa (35 ksi) |
| Tensile zog | 415 MPa (60 ksi) |
| Elongation hauv 2 hauv (50mm) | 30% |
| Charpy Impact Test | Ntawm -50℃F (-45 degree), 27 J nruab nrab transverse |
Cov txiaj ntsig no siv tau rau ob qho tib si seamless thiab welded yeeb nkab nyob rau hauv lub normalized mob. Phab ntsa tuab thiab cov ntsiab lus kho cua sov tuaj yeem hloov pauv qhov tau txais txiaj ntsig, yog li qhov project specification yuav tsum raug txheeb xyuas los ntawm daim ntawv pov thawj zeb xeem.
Qib 3 piv rau Qib 6: Yam twg rau koj qhov project?
| Yam | A333 Qib 3 | A333 Qib 6 |
|---|---|---|
| Yam tsawg kawg ntawm Kev Pabcuam Kub | Txog -101℃(-150℃F) | Txog -45℃(-50℃F) |
| Alloying | Kwv yees li 3.5% npib tsib xee | Carbon-manganese, tsis tas yuav tsum nickel |
| Hom Kev Pabcuam | Ua kua nitrogen, cryogenic systems | LNG terminals, ammonia, ethylene, refrigerated nroj tsuag |
| Nqi thiab Muaj | Tus nqi siab dua, cov khoom tshwj xeeb | Tsawg nqi, dav stocked |
Xaiv Qib 6 rau tus qauv qis- qhov kev pabcuam kub ib puag ncig -45℃thiab Qib 3 tsuas yog thaum tus qauv tsim kub poob qis dua qhov muaj peev xwm ntawm carbon-manganese hlau.
Daim ntawv thov ntawm A333 Qib 6
Nyob rau hauv LNG terminals, A333 Gr 6 yog siv rau cov txheej txheem piping, flare kab thiab cov khoom siv hluav taws xob nyob qhov twg qhov kub thiab txias nyob saum thaj tsam ntawm cov khoom siv. Hauv cov nroj tsuag petrochemical nws ua haujlwm rau ethylene, propylene, hluavtaws ammonia thiab LPG cov khoom tsim tawm, qhov twg cov xov xwm cryogenic raug tswj hwm ntawm qhov nruab nrab sub- xoom kub. Cov tshuab tub yees, cov chaw cia txias thiab cov chaw siv roj thiab cov roj av Arctic kuj tseem qhia txog qib 6 cov yeeb nkab rau kev ntsuas cua, cov tub yees thiab cov txheej txheem sib txuas.
Fabrication thiab Test
Welded Qib 6 yeeb nkab yog tsim los ntawm hluav taws xob tsis kam vuam lossis submerged arc vuam thiab feem ntau yog kho cua sov tom qab vuam kom rov qab qis dua - qhov kub thiab txias. Txhua qhov cua sov yuav raug kuaj tensile thiab Charpy impact test. Kev ntsuam xyuas hydrostatic yog ua nyob rau hauv lub zeb, thiab cov kev xav tau ntxiv tuaj yeem ntxiv kev kuaj xyuas ultrasonic, dye penetrant testing welds thiab hardness surveys. Nyob rau ntawm qhov chaw, vuam yuav tsum ua raws li tus txheej txheem tsim nyog nrog tsawg- hydrogen consumables thiab tswj interpass kub los tuav tej yam khoom nyob rau hauv lub tshav kub cuam tshuam cheeb tsam.
Kev Ntseeg Tsis Zoo
Ib qho yuam kev tsis tu ncua yog xav tias Qib 6 yog qhov tsim nyog mus rau -101℃vim hais tias tsev neeg A333 tau piav raws li qis -kub yeeb nkab. Qhov ntsuas kub tsim yuav tsum raug kuaj xyuas qhov ntsuas qhov ntsuas kub ntawm cov qib tshwj xeeb. Lwm qhov yuam kev yog vuam Qib 6 nrog cov pa roj carbon zoo tib yam electrodes thiab hla ncej-weld soj ntsuam, uas ua rau qhov kub thiab txias ntawm qhov sib koom ua ke. Qhov thib peb misconception yog tias tag nrho cov yeeb nkab A333 seamless; tus qauv sib npaug npog welded yeeb nkab ua rau tib yam chemistry thiab cov kev xav tau.
FAQ
Puas yog A333 Qib 6 zoo ib yam li SA333 Qib 6?
Yog lawm. SA333 Qib 6 yog ASME Boiler thiab Pressure Vessel Code tsim los ntawm cov khoom siv tib yam, nrog cov chemistry zoo tib yam thiab cov khoom siv kho tshuab. Ob lub npe raug lees txais hauv kev ua haujlwm siab piping.
A333 Qib 6 puas tuaj yeem siv rau LNG kav dej?
Yog lawm, rau saum toj no - cov txheej txheem LNG hauv av qhov chaw ua haujlwm kub nyob ib puag ncig -45℃lossis sov dua. LNG liquefaction ntawm -162℃yuav tsum muaj austenitic stainless hlau lossis 9% nickel khoom, tsis yog Qib 6.
Puas yog A333 Gr 6 weldable yam tsis muaj preheat?
Qib 6 muaj qhov zoo weldability, tab sis cov txheej txheem vuam tsim nyog nrog preheat ntawm 50℃mus rau 100℃thiab qis -hydrogen electrodes raug pom zoo los tiv thaiv hydrogen cracking thiab khaws tej yam toughness.
Qhov txawv ntawm A333 Gr 6 thiab A106 Gr B yog dab tsi?
A106 Qib B yog qhov siab -kub carbon steel yeeb nkab yam tsis tas yuav tsum tau kuaj qhov cuam tshuam, thaum A333 Qib 6 yog qhov qub thiab raug kuaj rau qis- kev pabcuam kub. Tsis txhob hloov A106 hauv sub-zero duty.
Puas yog A333 Qib 6 xav tau tom qab-weld heat treatment?
PWHT feem ntau tsis yog qhov yuav tsum tau ua rau nyias - phab ntsa Qib 6 piping, tab sis nws yuav xav tau los ntawm qhov project specification, thickness, los yog tom qab ua hauj lwm txias heev. Ua raws li txoj cai tswjfwm rau kev teeb tsa.
Dab tsi ntawm phab ntsa thicknesses muaj nyob rau hauv A333 Gr 6 welded yeeb nkab?
Welded A333 Gr 6 yeeb nkab yog muaj nyob rau hauv lub sij hawm los ntawm Sch10 txog Sch160 thiab nyob rau hauv kev cai phab ntsa, nyob rau hauv txoj kab uas hla los ntawm me me mus txog rau loj kab yeeb nkab qhov ntau thiab tsawg, raws li lub peev xwm zeb.