BS 4360 Qib 50 steel yog cov khoom siv tau lees paub rau kev tsim Longitudinal Submerged Arc Welded (LSAW) kav. Qhov kev sib xyaw ua ke no feem ntau yog siv rau kev xav tau cov qauv siv, cov phiaj xwm sab nrauv, thiab siab dua - cov tshuab xa dej siab.
Ntawm no yog cov ncauj lus kom ntxaws specification rau BS 4360 Qib 50 LSAW yeeb nkab.
Cov ntsiab lus tseem ceeb
| Yam ntxwv | Kev piav qhia |
|---|---|
| Txuj | SIB 4360: Kev tshem tawm British Standard specification rau weldable structural steels, tam sim no hloov los ntawm European qauv (EN 10025). |
| Qib | Qib 50: Ntau dua - zog carbon-manganese steel nyob rau hauv tus qauv BS 4360, muaj nyob rau hauv sub-qib xws li 50A, 50B, 50C, thiab 50D raws li qhov yuav tsum tau muaj kev xeem. |
| Txheej txheem | LSAW (Longitudinal Submerged Arc Vuam): Cov kav dej yog tsim los ntawm kev tsim cov hlau phaj rau hauv lub tog raj kheej (siv JCOE lossis UOE thev naus laus zis) thiab vuam cov seam ntev ob sab hauv thiab sab nraud siv cov txheej txheem submerged arc. |
| Chemical Composition (Qib 50D, max %) | |
| Cov pa roj carbon (C): 0.20 | |
| Manganese (Mn): 1.50 | |
| Phosphorus (P): 0.040 | |
| Sulfur (S): 0.040 | |
| Silicon (Si): 0.50 | |
| Niobium (Nb): 0.003-0.100 | |
| Vanadium (V): 0.003-0.150 | |
| Mechanical Properties (Tswj) | |
| Yield zog:355 MPa (51 ksi) yam tsawg kawg nkaus (rau thicknesses Tsawg dua los yog sib npaug li 16 hli) | |
| Tensile zog:490-630 MPa (71-91 ksi) ntau | |
| Elongation:Nws txawv ntawm thickness; feem ntau 20-22% | |
| Hom Loj Loj | |
| Sab nraud txoj kab uas hla:406mm txog 1820mm (16 "mus rau 72") | |
| Phab ntsa Thickness:6.0 hli txog 60 hli (txog 40 hli rau roj / roj, mus txog 60 hli rau piling) | |
| Ntev:6 m txog 12.3 m (txog 75 m muaj rau cov ntawv thov tshwj xeeb) | |
| Cov kauj ruam tsim khoom | 1. steel phaj xaiv thiab ntug milling. 2. Ntug crimping. 3. Kev tsim siv JCOE lossis UOE cov txheej txheem. 4. Sab hauv thiab sab nraud submerged arc vuam. 5. Mechanical expansion. 6. Tsis yog- kuaj kev puas tsuaj (Ultrasonic, X-ray). 7. Kev ntsuam xyuas hydrostatic. 8. Xaus ntsej muag thiab beveling. |
| Cov ntawv thov siv | Offshore platforms; marine qauv; siab -load piling foundations; kev tsim kho choj; siab - dej siab, roj, thiab roj kis; engineering cov qauv yuav tsum muaj zog dua. |
Nkag siab BS 4360 Qib 50
BS 4360 yog ib qho kev qhia dav dav hauv tebchaws Askiv rau cov qauv hlau. Hauv nws,Qib 50yog hais txog lub zog siab dua - steel nrog qhov tsawg kawg nkaus yield zog ntawm355 MPa rau(rau thickness txog li 16 hli). Qhov no ua rau nws cov keeb kwm ncaj qha sib npaug rau niaj hnubEN 10025 S355hlau.
Tsab ntawv suffix qhia txog qib uas yuav tsum tau muaj kev cuam tshuam toughness:
Qib 50A:Tsis muaj kev cai cuam tshuam.
Qib 50B:Tshwj xeeb cuam tshuam lub zog ntawm chav tsev kub (20 degree).
Qib 50C:Kev cuam tshuam lub zog ntawm 0 degree.
Qib 50D:Tshwj xeeb cuam tshuam lub zog ntawm -20 degree.
Qhov zoo ntawm Qib 50 LSAW Yeeb Nkab
| Qhov zoo | Kev piav qhia |
|---|---|
| Siab zog | Yam tsawg kawg yield zog ntawm355 MPa rau- muaj zog ntau dua li Qib 43 (275 MPa), tso cai rau cov phab ntsa nyias nyias lossis siab dua cov peev txheej. |
| Zoo heev Toughness | Qib 50D muaj kev lav phib xaub cuam tshuam rau-20 degree, haum rau offshore thiab xav tau ib puag ncig. |
| Loj Loj Muaj peev xwm | LSAW txheej txheem tso cai rau kev tsim cov kav loj - txoj kab uas hla (txog 72 "+) zoo tagnrho rau cov phiaj xwm loj. |
| Phab ntsa tuab | Haum rau siab -load daim ntawv thov xav tau cov phab ntsa tuab heev (txog 60 hli). |
| Weldability zoo | Tswj chemistry kom ntseeg tau qhov zoo ntawm qhov chaw weldability. |
Cov xwm txheej ntawm tus qauv
Nws yog ib qho tseem ceeb kom nco ntsoov tiasBS 4360 tau raug tshem tawmthiab hloov los ntawm European qauv, feem ntauTS EN 10025rau kub-rolled structural steel. Qhov sib npaug niaj hnub ntawm BS 4360 Qib 50 yogEN 10025 S355. Rau cov haujlwm tshiab lossis cov uas xav tau cov qauv tam sim no, S355 steel (feem ntau hauv LSAW kav rau cov qauv zoo liTS EN 10219) feem ntau tau teev tseg. Txawm li cas los xij, BS 4360 Qib 50 tseem tab tom ntsib hauv cov phiaj xwm qub txeeg qub teg, kev saib xyuas kev ua haujlwm, lossis hauv cov lus qhia tshwj xeeb los ntawm cov tuam txhab lag luam uas txuas ntxiv sau nws rau kev paub txog kev lag luam.
