GB / T 9711 L245 Steel Pipe yog dab tsi
GB / T 9711 yog Suav teb chaws tus qauv rau steel yeeb nkab siv nyob rau hauv pipeline tsheb thauj mus los systems nyob rau hauv cov roj av thiab natural gas industries. Nws yog technically ua raws li ISO 3183, thiab nws cov qhab-nees designations siv tsab ntawv L ua raws li qhov tsawg kawg nkaus yield zog nyob rau hauv megapascals. L245 yog li ntawd txhais tau hais tias qhov tsawg kawg nkaus tawm lub zog ntawm 245 MPa, uas muab tso rau ntawm qhov chaw nkag ntawm cov kab yeeb nkab qib ntau thiab ua rau nws qhov sib npaug ncaj qha ntawm API 5L Qib B.
Qib yog muab rau hauv PSL 1 thiab PSL 2 qib zoo. PSL 1 suav nrog cov chemistry yooj yim thiab cov kev xav tau tensile, thaum PSL 2 ntxiv cov kev txwv nruj dua ntawm cov pa roj carbon, sulfur thiab carbon sib npaug, qhov yuav tsum tau ntsuas qhov tawv tawv thiab kev soj ntsuam kom ntxaws ntxiv, thiab feem ntau yog xaiv rau cov kav dej uas tsis tshua muaj - qhov kub thiab txias los yog kev pabcuam qaub yog qhov kev txiav txim siab.
Properties thiab Composition Data
| Khoom | Kev xav tau |
|---|---|
| Yield zog, yam tsawg kawg nkaus | 245 MPa rau |
| Tensile zog | 415 MPa yam tsawg kawg nkaus, 760 MPa siab tshaj |
| Cov pa roj carbon max, PSL 1 | 0.26 % |
| Manganese max, PSL 1 | 1.20 % |
| Phosphorus max, PSL 1 | 0.030 % |
| Sulfur max, PSL 1 | 0.030 % |
| Sib npaug API 5L qib | Qib B |
| Hydrostatic xeem | Ua rau tus qauv ntsuas siab rau qhov loj |
| Kev xa khoom | Raws li dov, normalized los yog thermomechanically dov |
Vim tias qib siab zog yog nruab nrab, L245 ua tiav nws cov khoom nrog qhov yooj yim qis -carbon chemistry es tsis yog micro-alloying. PSL 2 yeeb nkab ntawm tib qib tau teev tseg nrog qis carbon, sulfur thiab phosphorus qab nthab thiab nrog cov pa roj carbon sib npaug txwv uas ua rau thaj chaw weldability kwv yees txawm nyob hauv cov phab ntsa hnyav.
Cov ntawv thov tseem ceeb
Ntev - kis tau tus mob mainsnqa cov roj crude, refined khoom thiab natural gas.
Sib sau cov kabtxuas tus neeg qhov dej mus rau qhov chaw ua haujlwm hauv nruab nrab.
Distribution networksxa cov pa roj rau cov neeg nyob hauv tsev, kev lag luam thiab kev lag luam.
Chaw nres tsheb piping thiab structural elementxws li kev txhawb nqa thiab thav duab hauv cov chaw kav dej.
Dej thiab slurry kabqhov twg ib tug nruab nrab lub zog kab yeeb nkab qib yog txaus.
Yog vim li cas Designers xaiv L245
Qib muaj qhov zoo - sib npaug ntawm cov khoom ntawm tus nqi qis. Weldability yog zoo heev: cov ntsiab lus ntawm cov pa roj carbon tsawg tso cai rau cov pa welding nrog cellulose los yog tsawg- hydrogen electrodes, thiab preheating yog ib txwm tsis tsim nyog rau cov qauv phab ntsa thicknesses. Formability yog qhov zoo, yog li cov yeeb nkab tuaj yeem khoov thiab haum rau hauv daim teb nrog cov khoom siv yooj yim. Vim hais tias cov qib yog tsim nyob rau hauv loj heev ntim nyob rau hauv Tuam Tshoj, dimensional sib xws thiab muaj yog txhim khu kev qha, thiab tus nqi ib tonne yog ib tug ntawm cov qis tshaj nyob rau hauv cov yeeb nkab kab ntau yam.
Ordering, Welding thiab Inspection Points
Thaum txiav txim, hais tus qauv, daim ntawv qib thiab tus lej, cov khoom specification qib, sab nraud txoj kab uas hla, phab ntsa thickness, cov yeeb nkab kawg mob thiab txheej. PSL 2 yuav tsum tau teev meej meej yog tias yuav tsum tau kuaj qhov tawv nqaij lossis kev txwv kev pabcuam qaub, vim tias qhov khoom xa tuaj yuav yog PSL 1.
Vuam yog ua raws li cov txheej txheem kev pom zoo tsim nyog raws li txoj cai lees paub, nrog rau cov khoom siv sib xyaw ua ke rau qib 245 MPa lub zog thiab nrog rau cov qib sulfur, uas tswj cov kev tiv thaiv kom ruaj khov tawg hauv cov seam. Kev tshuaj xyuas suav nrog kev kuaj xyuas qhov ntev, kev pom thiab tsis yog- kev kuaj xyuas kev puas tsuaj ntawm cov vuam seam, thiab kev ntsuas hydrostatic lossis tsis yog -kev puas tsuaj hluav taws xob xav tau los ntawm kev txiav txim.
FAQ
Q: Puas yog GB / T 9711 L245 tib yam li API 5L Qib B?
Qhov ob yog qhov sib npaug sib npaug ntawm cov txiaj ntsig thiab lub zog tensile, txij li ob qho tib si qhia txog 245 MPa yam tsawg kawg nkaus. Cov qauv sib txawv nyob rau hauv cov ncauj lus kom ntxaws chemistry txwv, xeem zaus thiab cim cov cai, yog li cov qauv siv tau yuav tsum tau teev nyob rau hauv qhov kev txiav txim.
Q: Tus lej 245 hauv L245 txhais li cas?
Nws yog qhov tsawg kawg nkaus yield zog qhia hauv megapascals. L245 yog li ntawd muaj qhov tsawg kawg nkaus tawm lub zog ntawm 245 MPa, uas yog hais txog 35,500 psi.
Q: Yuav tsum PSL 1 lossis PSL 2 raug txiav txim?
PSL 1 yog txaus rau cov kab onshore zoo tib yam hauv cov huab cua me me thiab tsis yog - cov dej num tseem ceeb. PSL 2 yog qhov zoo dua thaum qis- qhov kub thiab txias, qis carbon sib npaug, nruj dua sulfur txwv lossis kev xav txog kev pabcuam qaub.
Q: Puas yog L245 yeeb nkab xav tau preheating ua ntej vuam?
Rau ib txwm phab ntsa thicknesses thiab nruab nrab ambient kub, preheating feem ntau tsis tas yuav tsum tau vim muaj cov ntsiab lus carbon tsawg. Cov phab ntsa tuab, qhov kub thiab txias los yog siab ceev tuaj yeem hu rau preheat, thiab cov txheej txheem welded tsim nyog hais txog qhov xav tau tiag tiag.
Q: Qhov kev tiv thaiv corrosion yog siv rau ntawm L245 kab yeeb nkab?
Cov kab faus ib txwm tau txais peb - txheej polyethylene los yog fusion bonded epoxy txheej, nrog rau cov khoom siv sib koom ua ke ntawm girth welds. Internal txheej yog ntxiv qhov twg ntws efficiency los yog khoom purity yuav tsum tau.
Q: L245 puas tuaj yeem siv rau hauv kev pabcuam qaub?
Tsuas yog tias cov yeeb nkab raug txiav txim rau PSL 2 nrog chemistry thiab hardness txwv tsis pub ua kom txaus siab NACE MR0175 lossis ISO 15156. Standard PSL 1 yeeb nkab tsis yog npaj rau kev pabcuam ntub dej qaub.
