ASTM A252 Qib 2 Kauv Welded Steel Pipe (SSAW)
Lub ntsiab lus tseem ceeb
ASTM A252 Qib 2 Kauv Submerged Arc Welded (SSAW) steel yeeb nkabyog covfeem ntau siv qibrau kev siv lub hauv paus piling. Nws muaj kev sib xyaw ua ke ntawm lub zog, weldability, thiab tus nqi- kev ua tau zoo, ua rau nws xaiv tus qauv rau nruab nrab mus rau siab -load- cov kabmob xws li choj hauv paus, kev sib txuas hauv hiav txwv, thiab kev txhawb nqa lub tsev.
Lub npe piav qhia
| Ib feem | Lub ntsiab lus |
|---|---|
| ASTM | ASTM International |
| A252 | Standard specification rau welded thiab seamless steel yeeb nkab pawg |
| Qib 2 | Qib nruab nrab lub zog -feem ntau tau teev tsegrau kev siv piling |
| SSAW | Kauv Submerged Arc Vuam - ob npaug -sab vuam nrog muab tub lim hlau; weld seam khiav tsis tu ncua nyob rau hauv ib tug kauv raws cov yeeb nkab ntev |
Cov ntsiab lus tseem ceeb
| Yam ntxwv | Kev piav qhia |
|---|---|
| Txuj | ASTM A252 / A252M - "Standard Specification rau Welded thiab Seamless Steel Pipes" |
| Lub luag haujlwm tseem ceeb | Kev txhawb nqa kev tsim qauv- thauj khoom mus tas li- nqa cov tswv cuab lossis lub plhaub rau cam khwb cia- hauv - qhov chaw ua vaj tse |
| Kev tsim khoom | Spiral Submerged Arc Vuam (SSAW) - ob npaug -sab tsis siv neeg vuam |
| Yam tsawg kawg nkaus Yield Strength | 240 MPa (35,000 psi) |
| Yam tsawg kawg Tensile Strength | 415 MPa (60,000 psi) |
| Tsawg kawg Elongation | 25% |
| Size Range (SSAW) | 219mm txog 4064mm(8 "mus rau 160") OD |
| Phab ntsa Thickness | 3.2mm txog 60mm(ntau ntau 6-25.4mm) |
| Ntev | 6 m rau 32 m txheem; mus txog 24 m raug |
| Xaus Xaus | Plain kawg (PE) tus qauv; beveled xaus rau thaj chaw vuam (30℃bevel) |
Tshuaj muaj pes tsawg leeg
ASTM A252 qhia tshwj xeeb tshaj yog txwv rau phosphorus. Tag nrho peb qib muaj tib qhov txwv tsis pub muaj:
| Element | Ntau tshaj % |
|---|---|
| Cov pa roj carbon (C) | 0.26% (tus qauv, tsis muaj cai) |
| Manganese (Mn) | 1.60% (tseem, tsis muaj cai) |
| Silicon (Si) | 0.45% (tus qauv, tsis muaj cai) |
| Phosphorus (P) | 0.050%(yuav tsum tau) |
| Sulfur (S) | 0.030% (tus nqi) |
Lus Cim: Tus qauv tsom mus rau cov khoom siv kho tshuab es tsis yog cov tshuaj lom neeg muaj pes tsawg leeg. Cov hlau yuav tsum tsis pub tshaj 0.050% phosphorus.
Mechanical Properties Sib piv
| Qib | Yield zog (min) | Tensile zog (min) | Elongation (min) | Lub zog vs. Qib 1 |
|---|---|---|---|---|
| Qib 1 | 205 MPa (30,000 psi) | 345 MPa (50,000 psi) | 30% | Lub hauv paus |
| Qib 2 | 240 MPa (35,000 psi) | 415 MPa (60,000 psi) | 25% | +17% tawm |
| Qib 3 | 310 MPa (45,000 psi) | 455 MPa (66,000 psi) | 20% | +51% tawm |
Qhov chaw:
Dimensional Tolerances
| Parameter | Ua siab ntev |
|---|---|
| Sab nraud txoj kab uas hla (OD Tsawg dua los yog sib npaug rau 508mm) | ± 1% lossis ± 1.0mm (qhov twg ntau dua) |
| Sab nraud txoj kab uas hla (OD> 508mm) | ± 1% lossis ± 4.0mm (qhov twg ntau dua) |
| Phab ntsa Thickness | +15% / -12.5% ntawm nominal |
| Qhov hnyav | +15% / -5% ntawm qhov hnyav theoretical |
| Kev ncaj | Tsawg dua lossis sib npaug li 0.1% ntawm tag nrho qhov ntev |
Yam Muaj Ntau Yam Loj (SSAW):
| OD (inch) | OD (mm) | Phab ntsa Thickness Range (mm) |
|---|---|---|
| 16" | 406 | 6.0 - 14.0 |
| 20" | 508 | 6.0 - 16.0 |
| 24" | 610 | 6.0 - 18.0 |
| 30" | 762 | 7.0 - 21.0 |
| 36" | 914 | 8.0 - 24.0 |
| 40" | 1016 | 8.0 - 26.0 |
| 48" | 1219 | 9.0 - 28.0 |
| 56" | 1422 | 10.0 - 29.0 |
| 60" | 1524 | 10.0 - 29.0 |
| 64" | 1626 | 10.0 - 30.0 |
| 72" | 1829 | 10.0 - 30.0 |
SSAW Manufacturing txheej txheem
Kauv welded kav hauv qab ASTM A252 yog tsim los siv cov txheej txheem hauv qab no:
| Kauj ruam | Kev piav qhia |
|---|---|
| 1. Kev npaj cov khoom nyoos | Steel coils ntsib ASTM A252 qhov yuav tsum tau ua yog qib thiab ntug-milled |
| 2. Ntug Kev Npaj | Cov npoo npoo yog milled rau kev vuam zoo |
| 3. Kauv sib sau | Hlau sawb txuas ntxiv tsim rau hauv cov duab cylindrical ntawm lub kaum ntse ntse tshwj xeeb |
| 4. Submerged Arc Vuam | Ob -sab tsis siv neeg submerged arc vuam(sab hauv thiab sab nraud) tsim cov spiral seam |
| 5. Weld NDT | 100% ultrasonic soj ntsuam ntawm cov vuam seam |
| 6. Kev Ntsuas Hydrostatic | Txhua cov yeeb nkab tau sim (yeem rau ASTM A252, tab sis kev coj ua qauv) |
| 7. Kev ua tiav tiav | Plain los yog beveled xaus rau welding |
Kev Ntsuas & Kev Ntsuam Xyuas Cov Cai
| Hom kev xeem | Kev xav tau | Sau ntawv |
|---|---|---|
| Tshuaj ntsuam xyuas | Rau qhov kub ntau | Phosphorus txwv txwv |
| Tensile Test | Rau ntau | Txheeb xyuas qhov tawm los thiab lub zog tensile |
| Flattening Test | Yuav tsum tau | Txheeb xyuas qhov ductility thiab weld kev ncaj ncees |
| Khoov Test | Yuav tsum tau- 180℃khoov kuaj ntawm cov qauv weld | Xyuas qhov weld ductility |
| Hydrostatic Test | Kev xaiv rau ASTM A252 | Tsis tas yuav tsum tau piling kav |
| Ultrasonic soj ntsuam | 100% ntawm weld seam | Standard xyaum rau SSAW |
| Dimensional soj ntsuam | 100% | Raws li ASTM A252 tolerances |
| Mill Test Certificate | EN 10204 Hom 3.1B | Muab tag nrho cov kev xeem |
Daim ntawv thov
Qib 2 yog tus qauv xaiv rau feem ntau daim ntawv thov piling:
| Daim ntawv thov | Kev piav qhia |
|---|---|
| Choj Foundations | Pier thiab abutment kev them nyiaj yug rau hla - tus choj dej / hiav txwv |
| Lub Hauv Paus Tsev | Nruab nrab mus rau siab -nce lub hauv paus tob |
| Marine Structures | Chaw nres nkoj, docks, wharves yuav tsum muaj corrosion-cov coatings resistant |
| Industrial Plant Foundations | Heavy equipment foundation pawg |
| Av Reclamation | Ntug hiav txwv embankments, reclamation bulkheads |
| Kev tuav phab ntsa | Lateral av siab kuj |
| Tej hauj lwm ib ntus | Lub hauv paus kev txhawb nqa rau subways / tsev |
Kev Taw Qhia Qib
| Qib | Yield zog | Zoo tshaj rau |
|---|---|---|
| Qib 1 | 205 MPa (30 ksi) | Lub teeb-load daim ntawv thov, cov av zoo, cov qauv ib ntus, kev lag luam feem ntau |
| Qib 2 | 240 MPa (35 ksi) | Feem ntau- nruab nrab- cov tsev nce siab, choj hauv paus, piling dav dav, cov qauv hauv hiav txwv |
| Qib 3 | 310 MPa (45 ksi) | Hnyav-load daim ntawv thov, txuas hniav loj, cov chaw sab nrauv, thaj tsam seismic |
Rau feem ntau daim ntawv thov hauv paus, Qib 2 yog qhov pom zoo ua ntej.
Qhov zoo ntawm SSAW rau Qib 2 Piling
| Qhov zoo | Kev piav qhia |
|---|---|
| Optimal Strength-rau- Tus nqi piv | Qib 2 muaj qhov sib npaug zoo tshaj plaws ntawm qib A252 - 17% siab zog dua qib 1 ntawm tus nqi qis |
| Loj Loj Muaj peev xwm | SSAW tsim cov kav dej ntawm 8 "mus rau 160" OD - zoo tagnrho rau cov ntawv loj - txoj kab uas hla |
| Ntev ntev | Txog li 32m ntev txo cov kev xav tau ntawm kev sib tshuam |
| High Weld Integrity | 100% UT soj ntsuam ntawm weld seam kom zoo |
| Spiral Stress Distribution | Spiral weld disperses kev ntxhov siab ntau sib npaug thaum tsav tsheb |
| Khoom siv tau zoo | Muaj peev xwm siv txoj hlua khi hlau los tsim cov kav loj - txoj kab uas hla |
| Kev tiv thaiv corrosion | FBE, 3LPE, thee tar epoxy, pob zeb hnyav txheej muaj |
Kev txiav txim siab tseem ceeb
1. Qib 2 vs. Qib 1 thiab Qib 3
Qib 1: Lub teeb-load daim ntawv thov, cov av zoo, cov qauv ib ntus
Qib 2: Qib feem ntau- nruab nrab-cov tsev nce siab, choj hauv paus, cov nroj tsuag kev lag luam, cov qauv hauv hiav txwv
Qib 3: Heavy-load daim ntawv thov, txuas hniav loj, offshore platforms, seismic zones
2. Tsis tas yuav tsum kuaj Hydrostatic
ASTM A252 ua tautsis yogyuav tsum tau kuaj hydrostatic vim hais tias cov kav dej piling tau ntim nrog cov pob zeb thiab tsis siv rau cov kua xa tawm
Txawm li cas los xij, feem ntau cov tuam ntxhab muab kev sim hydrostatic raws li kev coj ua
3. Khoov Test yog qhov tseem ceeb
Qhov kev ntsuas 180℃khoov yog qhov yuav tsum tau ua rau cov kav dej sib txuas thiab ncaj qha soj ntsuam qhov vuam qhov ductility nyob rau hauv kev khoov kev ntxhov siab zoo ib yam li thaum lub sijhawm teeb tsa.
4. Kev tiv thaiv corrosion
Rau cov qauv mus tas li, qhia cov txheej txheem tsim nyog raws li ib puag ncig:
FBE/3 LPE: Rau pawg faus thiab ib puag ncig hnyav (50+ xyoo kev pab cuam lub neej)
Coal Tar Epoxy: Rau kev siv marine
Pob zeb hnyav txheej (CWC): Rau offshore / subsea pawg
Galvanized: Rau saum- daim ntawv thov hauv av
5. Xaus kev txhawb zog
Rau kev tsav tsheb nyuaj, qhia qhov kawg kev txhawb nqa:
Tsav khau: Tiv thaiv pawg lus thaum tsav tsheb los ntawm cov txheej tuab
Tsav tsheb: Lub nplhaib sab nraud ntawm qhov kawg los txhawb qhov kawg
Sab hauv stiffeners: Tiv thaiv buckling nyob rau hauv kev tsav tsheb nyuaj
6. Cov Lus Qhia Ntxiv
ASTM A252 suav nrog cov kev xav tau ntxiv uas tuaj yeem teev tseg rau cov ntawv thov tseem ceeb:
S1: Charpy V-Ntch Impact Test (rau qis-kev siv kub)
S2: Poob-Kev Ntsuas Qhov Ntsuas (qhov tseeb ntawm pob txha toughness)
S3: Microstructure Examination (weld and HAZ quality check)
S4Tom ntej: Ultrasonic Lamination Test (nrhiav phaj imperfections)
7. Thib peb-Kev soj ntsuam tog
Muaj cov kev pabcuam tshuaj xyuas suav nrog SGS, BV, Lloyds
Cov ntsiab lus
ASTM A252 Qib 2 Kauv Submerged Arc Welded (SSAW) steel yeeb nkabyog covstandard, feem ntau siv qibrau kev siv lub hauv paus piling. Nrog yam tsawg kawg nkaus tawm lub zog ntawm35,000 psi (240 MPa) – 17% siab dua Qib 1- thiab tensile lub zog ntawm60,000 psi (415 MPa), Qib 2 muaj qhov zoo tshaj qhov sib npaug ntawm lub zog, weldability, thiab tus nqi -kev ua tau zoo rau nruab nrab mus rau siab -load- cov ntawv thov kev coj noj coj ua .
Cov yam ntxwv tseem ceeb:
Khoom txheemQib 2: ASTM A252 Qib 2 - qib feem ntau rau cov piling dav dav
Yield zog: 240 MPa (35,000 psi) yam tsawg kawg nkaus – +17% vs Qib 1
Tensile zog: 415 MPa (60,000 psi) yam tsawg kawg nkaus
Elongation: 25% yam tsawg kawg nkaus - zoo ductility rau installation
SSAW manufacturingtsim cov kav dej los ntawm8" rau 160" ODnrog phab ntsa thickness mus txog60 mm
Ob -sab vuamtsim ib lub siab -zoo weld nugget
100% ultrasonic kuajntawm weld seam kom zoo
Khoov xeem yuav tsum tau- qhov tseem ceeb rau kev siv piling
Tus nqi- zoo- qhov zoo tshaj plaws sib npaug ntawm kev ua haujlwm thiab kev lag luam
Cov ntawv thov uas muaj xws li:
Choj foundations thiab pier kev txhawb nqa
Nruab nrab mus rau siab -nce lub hauv paus
Marine cov qauv (docks, wharves, ports)
Industrial cog foundations
Av reclamation thiab ntug hiav txwv embankments
Retaining phab ntsa thiab ib ntus shoring
Thaum ordering, qhia:ASTM A252 Qib 2, SSAW (Spiral Submerged Arc Welded), Qhov Loj (OD x WT), Ntev, Qhov Kawg Finish (plain / beveled), Cov Txheej Txheem Txheej Txheem (yog xav tau), thiab Daim Ntawv Pov Thawj Zeb Xeem rau EN 10204 Hom 3.1B. Rau feem ntau cov kev siv piling,Qib 2yog qhov pom zoo default.
