Dab tsi ASTM A333 Qib 6 yog siv rau
ASTM A333 / A333M npog seamless thiab welded steel yeeb nkab rau qis - qhov kub thiab txias. Qib 6 yog qib carbon steel ntawm tsev neeg thiab yog cov neeg ua haujlwm rau cov kav dej uas yuav tsum tiv taus cov pob txha tawg hauv cov mob khaub thuas: LNG thiab roj ua cov kav dej, tub yees thiab cryogenic hloov piping, txias- huab cua txheej txheem pipework thiab qis -kub kub pauv circuits. Lub npe ERW qhia txog qhov sib txawv ntawm cov welded, uas ua los ntawm cov hluav taws xob tiv thaiv vuam los ntawm cov pob txha es tsis yog los ntawm kev tho lub pob zeb.
Qib 6 yog xaiv los tiv thaiv Qib 3, uas yog qhov cuam tshuam rau qhov ntsuas kub qis, thiab tiv thaiv 3.5% thiab 9% npib tsib xee steels, uas nqa cov nqi siab dua. Qib 6 muab cov nqi zoo tshaj plaws uas nws qhov ntsuas kub txaus rau kev tsim.
Tshuaj muaj pes tsawg leeg
| Element | Kev xav tau (%) |
|---|---|
| Cov pa roj carbon (max) | 0.30 |
| Manganese | 0.29-1.06 |
| Phosphorus (max) | 0.025 |
| Sulfur (max) | 0.025 |
| Silicon (min) | 0.10 |
| Nickel (max) | 0.40 |
| Chromium (max) | 0.30 |
| Tooj liab (max) | 0.40 |
Cov pa roj carbon yog capped vim nkig puas ntsoog tiv thaiv kev txhim kho raws li cov pa roj carbon poob, thiab cov khoom seem raug txwv kom tsis txhob muaj qhov hloov pauv kub thiab tsis txhob cuam tshuam nrog vuam.
Mechanical Requirements thiab Impact Testing
| Khoom | Kev xav tau |
|---|---|
| Tensile zog, min | 415 MPa rau |
| Yield zog, min | 240 MPa |
| Elongation hauv 2 hauv., min | 30% |
| Impact test kub | -45 C (-50 F) |
| Charpy V-notch absorbed zog, nruab nrab | 18 J (13 ft-lbf) min, qhov loj me |
Qhov kev ntsuam xyuas cuam tshuam yog qhov kev txiav txim siab ntawm qib. Charpy V-cov ntaub ntawv pov thawj yog muab los ntawm cov yeeb nkab lub cev, thiab rau cov yeeb nkab welded los ntawm cov yeeb nkab lub cev thiab, qhov twg yuav tsum tau, los ntawm vuam seam. Lub zog nqus tau ib txwm teev raws li qhov nruab nrab yam tsawg kawg nkaus rau cov txheej txheem ntawm peb tus qauv, nrog rau kev lees txais qis dua rau ib qho qauv. Lateral expansion tej zaum yuav raug hloov los yog ntxiv thaum daim ntawv xaj yuav qhia nws.
ERW Manufacturing Route
ERW yeeb nkab yog tsim los ntawm coil mus rau hauv ib lub cylindrical zoo thiab welded raws seam los ntawm cov cua kub tsis kam thiab forging siab, nrog rau sab hauv thiab sab nraud weld flash trimmed. Cov txheej txheem ceev ceev thiab ua rau cov phab ntsa tuab zoo sib xws, uas ua rau nws pheej yig rau kev khiav ntev ntawm me me mus rau nruab nrab txoj kab uas hla qis -kub yeeb nkab. Cov kev tswj hwm qhov sib txawv yog kev npaj ntug, weld zog, forging siab thiab tom qab kev kho cua sov ntawm thaj tsam weld.
Vim tias ERW seam yog txoj hauv kev muaj peev xwm tawg, A333 yuav tsum tau kuaj xyuas qhov vuam. Nondestructive kuaj ntawm seam los ntawm ultrasonic los yog electromagnetic txoj kev, ntxiv rau ib tug transverse weld tensile xeem qhov kev txiav txim yuav tsum tau, yog tus qauv xyaum. A333 yeeb nkab kuj raug txiav txim nrog kev kho cua sov kom zoo thaum daim ntawv thov xav tau qhov hloov pauv qis tshaj plaws, txij li normalizing refines cov qauv nplej thiab txhim kho toughness.
Vuam thiab Fabrication Notes
Qib 6 yog yooj yim weldable los ntawm shielded hlau arc, roj tungsten arc thiab submerged arc txheej txheem. Vim tias cov khoom siv yog npaj rau qis-tej dej kub, cov khoom siv vuam thiab cov txheej txheem tau tsim nyog los ntawm kev ntsuas kev cuam tshuam ntawm lossis qis dua qhov kub ntawm qhov kev pabcuam, thiab preheat feem ntau txwv rau qhov xav tau kom tsis txhob ya raws ntawm qhov chaw txias. Cov pob qij txha hauv cov kev pabcuam cryogenic yuav tsum raug tiv thaiv thaum kuaj hydrostatic, thiab txhua qhov nplaim taws ncaj yuav tsum raug zam vim tias cov cua sov hauv zos tuaj yeem ua rau qhov tsis zoo ntawm cov hlau ib puag ncig.
Cov lus nug nquag
Q:Dab tsi yog qhov ntsuas qhov ntsuas kub rau A333 Qib 6?
A: -45 C, sib npaug rau -50 F. Kev ntsuam xyuas cuam tshuam nrog qhov nruab nrab qhov nruab nrab nqus ntawm 18 J rau qhov loj me Charpy V-notch specimens yog qhov yuav tsum tau ua ntawm qib.
Q:Dab tsi yog qhov tsawg kawg nkaus tensile thiab yield zog?
A: Lub zog tensile yam tsawg kawg nkaus yog 415 MPa thiab qhov tsawg kawg nkaus yield zog yog 240 MPa, nrog qhov tsawg kawg nkaus elongation ntawm 30% hauv 2 hauv.
Q:Puas yog A333 Qib 6 muaj raws li ERW yeeb nkab?
A: Yog. A333 / A333M npog ob leeg seamless thiab welded yeeb nkab, thiab ERW variant yog dav siv nyob rau hauv me me thiab nruab nrab diameters. Weld seam yuav tsum tau soj ntsuam raws li ib feem ntawm cov specification.
Q:Qib 6 txawv ntawm A333 Qib 3 li cas?
A: Qib 3 yog qhov ntsuas qhov ntsuas kub qis dua thiab siv qhov ntsuas qhov ntsuas kub qis dua qib 6 ntsuas kub. Qib 6 yog qhov kev xaiv pheej yig dua qhov twg nws qhov yuav tsum tau ua kom nruj.
Q:Puas yog A333 Qib 6 yeeb nkab xav tau normalising?
A: Tsis yog ib txwm, tab sis normalizing feem ntau tau teev tseg rau cov kev pabcuam txias vim tias nws ua kom zoo dua cov qauv nplej thiab txo cov ductile - mus rau - qhov kub hloov pauv hloov. Kev kho cua sov yuav tsum tau teev nyob rau hauv daim ntawv xaj yuav khoom.