API 5L GR.B PSL2 kab yeeb nkab yog siab -cov khoom siv tubular siv dav hauv kev lag luam roj thiab roj. Raws li qib thib ob zoo raws li API 5L, nws tsim cov kev cai nruj dua li GR.B PSL1 hais txog cov tshuaj muaj pes tsawg leeg, cov khoom siv kho tshuab, qhov ntev ntev, thiab tsis yog - kuaj kev puas tsuaj. Qhov no ua kom haum rau siab - kev sib kis siab, ntev - cov kav dej nyob deb, thiab thaj chaw geological nyuaj.
API 5L GR.B PSL2 cov kav dej tau siv dav hauv qhov ntev - cov kav xa hluav taws xob nyob deb, kev sib sau ua ke, cov kav dej hauv nroog, thiab cov kav dej muaj thoob plaws cov roj & roj, tshuaj, thiab hluav taws xob. Tshwj xeeb tshaj yog nyob rau hauv huab cua kev khiav hauj lwm uas muaj kev kub siab, siab kub, los yog corrosive xov xwm, lawv seamless variants ua hauj lwm raws li ib tug tseem ceeb Cheebtsam vim tshwj xeeb kev ua tau zoo thiab kev ntseeg tau.
Cov tshuaj muaj pes tsawg leeg ntawm API 5L Qib B psl2 carbon steel seamless yeeb nkab
| CHEMICAL COMPOSITION | |||||||||||
| Cov feem ntau, raws li cov cua sov thiab cov khoom tsom xam % siab tshaj plaws | CARBON EQUIVALENT a | ||||||||||
| % MAXIMUM | |||||||||||
| Cb | Si | Mnb | P | S | V | Nb | Ti | Lwm yam | CEIIW | CEPcm | |
| Seamless & welded kav | |||||||||||
| L245R LUB BR | 0.24 | 0.4 | 1.2 | 0.025 | 0.015 | c | c | 0.04 | e | 0.43 | 0.25 |
| L245Q LUB BQ | 0.18 | 0.45 | 1.4 | 0.025 | 0.015 | 0.05 | 0.05 | 0.04 | e | 0.43 | 0.25 |
| WELDED PIPE | |||||||||||
| L245M or BM | 0.22 | 0.45 | 1.2 | 0.025 | 0.015 | 0.05 | 0.05 | 0.04 | e | 0.43 | 0.25 |
Mechanical zog ntawm API 5L Qib B psl2 carbon steel seamless yeeb nkab
| MECHANICAL REQUIREMENTS | |||
|
Y.S |
T.S |
ELONGATION |
|
|
Mpa (psi) |
Mpa (psi) |
||
|
min |
min |
min |
|
|
245(35 500) |
450(50 300) |
f |
|
API 5L GR.B PSL1 vs PSL2 Qhov Tseem Ceeb Qhov txawv
| Parameter | PSL1 (Basic) | PSL2 (Txhim kho) | Kev cuam tshuam |
|---|---|---|---|
| Tshuaj muaj pes tsawg leeg | |||
| - CEEB | Tsawg dua lossis sib npaug li 0.43% | Tsawg dua lossis sib npaug li 0.43% (tib yam) | Kev xav tau sib npaug |
| - Sulfur (S) | Tsawg dua lossis sib npaug li 0.030% | Tsawg dua lossis sib npaug li 0.015%(50% stricter) | ↑ SSC Resistance |
| - Phosphorus (P) | Tsawg dua lossis sib npaug li 0.030% | Tsawg dua lossis sib npaug li 0.025% | ↑ Tsawg-Tsub Toughness |
| Mechanical Properties | |||
| - Yield zog | Ntau dua lossis sib npaug li 240 MPa | Ntau dua lossis sib npaug rau 240 MPa (tib yam) | Cov hauv paus ntsiab lus |
| - Charpy Impact Test | xaiv tau | Yuav tsum tau (Ntau tshaj lossis sib npaug rau 40J @ -20 degree) | ↑ Cryogenic kev nyab xeeb |
| - Hardness txwv | Tsis tau teev tseg | Tsawg dua lossis sib npaug li 250 HBW | Tiv thaivHIC/SSC Failure |
| Tsis yog -Kev kuaj kev puas tsuaj | |||
| - Kev kuaj Ultrasonic (UT) | Qauv | 100% Tag nrho-lub cev | ↑ Kev kuaj pom tsis zoo |
| - Kev ntsuas hluav taws xob (RT) | Tsis xav tau | 100% ntawm welds / HAZ | Rau welded kav nkaus xwb |
| Dimensional kam rau ua | |||
| - Phab ntsa Thickness | ±12.5% | ±10.0%(tighter) | ↑ Precision los ntawm 25% |
| - Ovality | Tsawg dua lossis sib npaug li 1.5% | Tsawg dua lossis sib npaug li 1.0% | ↑ Sealing Reliability |
| Tej kev siv | Tsawg-siab / tsis yog-corrosive (piv txwv li, dej) | Siab - kev pabcuam siab / corrosive (piv txwv li, roj qaub) | Qhov tseem ceeb rau qhov chaw hnyav |
Cov txheej txheem ntau lawm ntawm API 5L GR.B PSL2 Seamless Yeeb Nkab
Steelmaking & Nruam Casting
Advanced converter / hluav taws xob rauv smelting nrogkev tswj tshuaj nruj nruj(Ceq Tsawg dua lossis sib npaug rau 0.43%)
Secondary refining (piv txwv li, LF / RH furnaces) rausteel purity [H] Tsawg dua los yog sib npaug rau 1.5ppm
Electromagnetic stirring thaum lub sij hawm casting kom ntseeg tauhomogeneous billet qauv
Kub Rolling & Piercing
Billet cua sov ntawm1200 ± 20 degree→ Rolling rau hauv lub raj blanks
Hollow plhaub tsim los ntawmhla- dov piercinglos yogxovxwm tho
Kev tswj hwm qhov tseem ceeb: Deformation ratio Ntau dua los yog sib npaug rau 6: 1rau grain refinement
Ua haujlwm txias (yeem)
Txias dov / kos duab rau± 0.1mm qhov ntev precision
Kev ntxhov siab -relief annealing ntawm650-700 degree(yuav tsum tau ua kom txias - cov kav dej ua haujlwm)
Kev kho cua sov
normalizing: 880-920 degreeCua txias → Txhim kho toughness
Quenching & Tempering:
Quenching (900 degreeCov tshuaj tsuag dej) → Tempering (600 degree) → AchievesNtau dua los yog sib npaug rau 360MPa yield zog
Tsis yog -Kev kuaj kev puas tsuaj
100% kev pab them nqi rau PSL2:
UT(nrhiav ntau dua lossis sib npaug rau1.6mm ibQhov tsis zoo rau ASTM E213)
ET(Ntoo defects Tsawg dua los yog sib npaug rau0.3mm ibqhov tob)
RT(phab ntsa thickness variation Tsawg dua los yog sib npaug rau±5%)
API 5L GRB PSL2 carbon kab yeeb nkab Hoobkas
