ASTM A252 Qib 3 yog lub zog siab tshaj plaws thiab feem ntau tau teev tseg qib rau kev tsim Spiral Submerged Arc Welded (SSAW) steel kav rau kev siv hauv paus.[siv: 3, citation: 4, citation: 6]. Qhov kev sib xyaw ua ke no sawv cev rau qhov kev xaiv zoo tshaj plaws rau cov phiaj xwm xav tau qhov siab tshaj plaws load-cov kabmob muaj peev xwm, tiv thaiv kev tsav tsheb hnyav, thiab kev ua haujlwm zoo dua yuav tsum tau ua.
Lub npe "ASTM A252 Qib 3 Kauv Submerged Arc Yeeb Nkab" sib txuas cov qib siab tshaj plaws ntawm ASTM A252 piling txuj nrog rau cov txheej txheem kauv vuam rau loj - txoj kab uas hla, hnyav - lub luag haujlwm hauv paus pawg [citation: 4, citation: 6].
📋 Cov ntsiab lus tseem ceeb rau ASTM A252 Qib 3 SSAW Yeeb Nkab
Cov lus hauv qab no qhia txog cov ntsiab lus tseem ceeb rau cov khoom no, raws li cov ntaub ntawv kev lag luam dav dav [citation: 1, citation: 3, citation: 4, citation: 6, citation: 7, citation: 8, citation: 10].
| Yam ntxwv | Kev piav qhia |
|---|---|
| Txuj | ASTM A252 / A252M ASTM: "Standard Specification for Welded and Seamless Steel Pipe Piles" [citation: 1, citation: 3, citation: 4, citation: 6]. |
| Qib Steel | Qib 3: Covqib siab zognyob rau hauv ASTM A252 specification, tsim rau siab tshaj load- bearing muaj peev xwm thiab hnyav tsav tsheb [citation:4, citation:6, citation:7]. |
| Kev tsim khoom | Spiral Submerged Arc Vuam (SSAW/HSAW): Ua los ntawm kub- dov steel coil ntawm chav tsev kub, nrog cov vuam seam khiav tsis tu ncua nyob rau hauv ib tug kauv. Welded siv ob -sided tsis siv neeg submerged arc vuam [citation: 1, citation: 4, citation: 5]. |
| Chemical Composition (max %) [citation: 4, citation: 7, citation: 10] | Cov pa roj carbon (C):0.25-0.32% (tus nqi) Manganese (Mn):1.20-1.60% (tus qauv) Phosphorus (P):Tsawg dua los yog sib npaug rau 0.050% (raws li ASTM) [citation: 6, citation: 7] Sulfur (S):Tsawg dua los yog sib npaug rau 0.050% (raws li ASTM) [citation: 6, citation: 7] Silicon (Si):0.15-0.50% (tus nqi) Lus Cim: ASTM A252 tsis txwv cov tshuaj muaj pes tsawg leeg ntawm P thiab S, tsuas yog cov khoom siv kho tshuab[qhia: 3, citation: 4]. |
| Mechanical Properties (min) [citation: 1, citation: 3, citation: 4, citation: 6, citation: 7, citation: 8, citation: 10] | Yield zog: 310-345 MPa (45,000-50,000 psi) Tensile zog: 455-480 MPa (66,000-70,000 psi) Elongation: 14-20% tsawg kawg nkaus(Nws txawv ntawm phab ntsa thickness thiab ntsuas qhov ntev) [citation: 4, citation: 10] |
| Hom Loj Ntau Yam [citation: 1, citation: 2, citation: 4, citation: 6, citation: 8, citation: 10] | Sab nraud txoj kab uas hla:219mm txog 4064mm (kwv yees . 8" rau 160") [citation:1, citation:2, citation:4] Phab ntsa Thickness:3.2 hli mus rau 75 hli (ntau ntau 8-50 hli) [citation: 4, citation: 6, citation: 8, citation: 10] Ntev:3 m rau 18 m txheem; mus txog 50 m muaj rau cov ntawv thov tshwj xeeb [citation: 2, citation: 6] |
| Cov Kev Ntsuas Tseem Ceeb [citation: 1, citation: 2, citation: 4, citation: 5, citation: 10] | Kev soj ntsuam Weld: 100% ultrasonic (UT) yuav tsum taurau cov neeg tsim khoom zoo; stringent defect kev lees txais. Khoov Test:Yuav tsum tau 180℃khoov kuaj yam tsis muaj cracking kom paub tseeb weld ductility [citation:3, citation:4]. Tensile Test:Txheeb xyuas cov txiaj ntsig thiab lub zog tensile rau ib qho [citation: 1, citation: 3]. Flattening Test:Txheeb xyuas qhov ductility thiab weld soundness [citation: 3, citation: 4]. Dimensional soj ntsuam:Raws li ASTM A252 Table 2 tolerances. Hydrostatic Test:Kev xaiv rau ASTM A252; yuav tsum tau teev yog tias xav tau. |
| Common Applications [citation: 4, citation: 6, citation: 10] | High-cov tsev siab (>50 zaj);loj choj piersthiab abutments [citation:4, citation:10];offshore platforms ; thaj chaw seismicyuav tsum tau txhim kho lub zog nqus;hnyav industrial foundations(rauj foundations, khoom siv loj);deepwater marine structures ; huab cua tej yam kev mobyuav tsum tau lub siab tshaj plaws bearing peev xwm. |
| Daim ntawv pov thawj | Mill Test Certificate feem ntau rauEN 10204 Hom 3.1Bnrog tag nrho cov txiaj ntsig kev xeem, tshuaj ntsuam xyuas, cov khoom siv kho tshuab, thiab cov ntaub ntawv NDT. |
📊 ASTM A252 Qib Sib Piv
Qib 3 yog qib siab tshaj plaws nyob rau hauv ASTM A252 specification. Cov lus hauv qab no qhia txog nws txoj haujlwm txheeb ze rau Qib 1 thiab 2 [citation: 1, citation: 3, citation: 4, citation: 6, citation: 7, citation: 8, citation: 10]:
| Qib | Yield zog (min) | Tensile zog (min) | Elongation (min) | Cov txheeb ze zog vs. Qib 1 | Daim ntawv thov |
|---|---|---|---|---|---|
| Qib 1 | 205-206 MPa (30,000 psi) [citation: 3, citation: 6, citation: 8] | 310-345 MPa (45,000-50,000 psi) [citation: 1, citation: 3, citation: 8] | 14-30% [Citation: 1, citation: 3] | Lub hauv paus | Lub teeb-load daim ntawv thov, cov av zoo, cov qauv ib ntus [citation:3, citation:4] |
| Qib 2 | 240-290 MPa (35,000-42,000 psi) [citation: 3, citation: 6, citation: 8] | 414-415 MPa (60,000-60,200 psi) [citation: 1, citation: 3, citation: 7] | 14-25% [Citation: 1, citation: 3] | +17-41% tawm | General piling daim ntaub ntawv - feem ntau yog rau nruab nrab loads [citation:3, citation:4] |
| Qib 3 | 310-345 MPa (45,000-50,000 psi)[npe: 3, citation: 4, citation: 6, citation: 7, citation: 8, citation: 10] | 455-480 MPa (66,000-70,000 psi)[npe: 1, citation: 3, citation: 4, citation: 6, citation: 7, citation: 10] | 14-20%[nqe: 3, citation: 4, citation: 10] | +51-68% tawm | Heavy-load daim ntawv thov, txuas hniav loj, offshore platforms, seismic zones, tob hauv paus[siv: 3, citation: 4, citation: 6, citation: 10] |
Kev nce feem pua:Qib 3 muaj kwv yees li51% siab zog tawm los ntawm Qib 1thiab28% siab dua Qib 2 .
📏 Dimensional Specifications
ASTM A252 qhia txog cov kev kam rau siab hauv qab no rau cov kav dej SSAW [citation: 4, citation: 8, citation: 10]:
| 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 | +15.0%, -12.5% ntawm nominal |
| Nyhav ib ko taw | +15.0%, -5.0% |
| Kev ncaj | Tsawg dua lossis sib npaug li 0.1% ntawm tag nrho qhov ntev |
| Length (ntev ntev) | +25mm / -0mm feem ntau |
| Xaus Xaus | Plain kawg (PE) tus qauv; beveled xaus rau thaj chaw vuam (30℃bevel nrog lub ntsej muag hauv paus) muaj [citation: 1, citation: 2, citation: 6] |
Standard Diameter Range rau SSAW:219mm txog 4064mm (8 "mus rau 160") [citation: 1, citation: 2, citation: 4, citation: 6, citation: 8]
🔍 Cov ntsiab lus tseem ceeb kom nkag siab
Dab tsi "ASTM A252 Qib 3" txhais tau tias: Qhov no yog qib hwm rau cov yeeb nkab steel raws li ASTM A252 specification. Nrog yam tsawg kawg nkaus tawm lub zog ntawm45,000-50,000 psi (310-345 MPa), nws yog tsim tshwj xeeb rau cov kev xav tau tshaj plaws hauv lub hauv paus daim ntawv thov qhov siab tshaj plaws load- bearing peev xwm ib pawg yuav tsum [citation:3, citation:4, citation:6, citation:10].
Yog vim li cas Qib 3 yog qhov kev xaiv hwm: Qib 3 muaj lub zog siab tshaj plaws ntawm qib A252, muab kwv yees li51% siab zog tawm los ntawm Qib 1. Qhov no tso cai rautxog li 40% tsawg pawgpiv rau Qib 1 rau tib qho kev thauj khoom tag nrho, ua rau lub kaus mom me me, kev khawb tsawg dua, thiab muaj peev xwm txo qis tag nrho cov nqi hauv paus txawm tias cov khoom siv ntau dua.
Qib 3 vs. Qib qis:
Qib 1: Rau lub teeb -load daim ntaub ntawv, cov qauv ib ntus, cov av zoo (tsawg dua los yog sib npaug rau 120 kN / m² bearing peev)
Qib 2: Qib feem ntau – haum rau nruab nrab- cov tsev nce, cov hauv paus hauv paus, cov nroj tsuag muaj
Qib 3: Qib hwm – for high-rise buildings (>50 zaj dab neeg), txuas hniav loj, ntug dej hiav txwv platform, seismic zones, nyuaj tsav tsheb, huab cua huab cua [citation: 3, citation: 4, citation: 6]
SSAW Qhov Zoo rau Qib 3: Cov txheej txheem welding muab cov txiaj ntsig tshwj xeeb rau cov loj - txoj kab uas hla, siab - lub zog pawg [citation:1, citation:3, citation:4]:
Loj Loj Muaj peev xwm: Muaj peev xwm tsim tau cov kav dej ntawm 8 "mus rau 160" txoj kab uas hla - zoo tagnrho rau cov ntawv loj - txoj kab uas hla
Kev Nyuaj Siab: Lub kauv weld seam disperses kev ntxhov siab ntau tusyees nyob ib ncig ntawm lub voj voog, muab15-20% siab dua axial compressive zogtshaj qhov ncaj seam welded yeeb nkab thaum tsav tsheb [citation: 3, citation: 4]
Ntev ntev: Txog li 50-70m ntev txo qhov kev xav tau ntawm thaj chaw splicing [citation: 2, citation: 6]
Khoom siv tau zoo: Siv tau txoj hlua khi hlau los tsim cov kav loj - txoj kab uas hla ntawm tib lub kauj dav
🔧 Kev Tsim Nyog rau ASTM A252 Qib 3 SSAW Yeeb Nkab
Cov txheej txheem tsim khoom ua raws li cov txheej txheem tsim khoom zoo dua qub nrog cov kev tswj xyuas zoo tsim nyog rau siab - zog Qib 3 cov cai [citation:1, citation:4]:
| Kauj ruam | Kev piav qhia |
|---|---|
| 1. Kev npaj cov khoom nyoos | Kub-rolled steel coils ntsib cov kev cai chemistry (feem ntau TMCP steel) yog qib, tshuaj xyuas, thiab ntug-milled . |
| 2. Kauv sib sau | Cov hlau sawb txuas ntxiv tsim rau hauv cov duab cylindrical ntawm lub kaum sab xis tshwj xeeb (feem ntau 50-70 degree) ntawm chav tsev kub siv tsib-yob txoj kev siv tshuab [citation:1, citation:4]. |
| 3. Submerged Arc Vuam | Muab ob npaug rau-sided tsis siv neeg submerged arc vuam (sab hauv thiab sab nraud) tsim cov kauv seam nrog kev nkag mus rau tag nrho.Preheat / interpass kub 100-150 degreefeem ntau yuav tsum tau tiv thaiv hydrogen cracking nyob rau hauv siab -lub zog steel . |
| 4. Tsis yog-Kev kuaj kev puas tsuaj | 100% ultrasonic (UT) tsis siv neeg qhov tsis pom kevntawm weld seam yog yuav tsum tau; kev tshawb nrhiav rhiab heev yuav tsum ua raws li cov qauv kev lees paub nruj. |
| 5. Kev Ntsuas Hydrostatic | Kev xaiv rau ASTM A252; yog hais tias, feem ntau ntawm70% yield siab max . |
| 6. Kev kuaj xyuas tshuab | Tensile tests, flattening tests, thiab180℃khoov kuajtxhawm rau txheeb xyuas cov khoom thiab vuam ductility [citation: 3, citation: 4]. |
| 7. Kev ua tiav tiav | Xaus npaj (dawb los yog beveled) rau welding teb; beveled kawg tus qauv rau kev sib txuas sib txuas [citation: 1, citation: 2, citation: 6]. |
| 8. Txheej | Cov txheej txheem sab nraud (epoxy resin, FBE, 3LPE, thee tar epoxy, bitumen) muaj rau kev tiv thaiv corrosion [citation: 1, citation: 2, citation: 6]. |
🏭 Daim ntawv thov
ASTM A252 Qib 3 SSAW cov kav dej yog qhov kev xaiv zoo tshaj plaws rau lub hauv paus xav tau tshaj plaws thiab kev siv cov qauv [citation: 4, citation: 6, citation: 10]:
| Daim ntawv thov | Kev piav qhia | Vim li cas Qib 3 thiaj xaiv |
|---|---|---|
| High-Rise Buildings (>50 zaj dab neeg) | Core tube pawg hauv paus rau skyscrapers thiab ultra- siab- cov tsev nce siab | Maximizes load peev xwm ib pawg, txo pawg kom muaj nuj nqis thiab cap loj, tso cai rau kev tsim kho nyob rau hauv constrained nroog qhov chaw |
| Major Bridge Foundations | Sib sib zog nqus-dej piers, choj loj abutments rau hla- tus choj dej hiav txwv [citation:4, citation:10] | Resistant loj dabtsi yog khoov lub sij hawm los ntawm cov dej tob; withstands dynamic tsheb thiab yoj loads |
| Offshore Platforms | Subsea cov qauv, roj / roj platforms xav tau lub zog siab - rau - qhov hnyav piv [citation: 4, citation: 10] | Lub zog zoo heev - rau - qhov hnyav piv; feem ntau xav tau cov kev qhia tshwj xeeb ntxiv (API) |
| Seismic Zones | Av qeeg- tej thaj chaw uas yuav tsum tau ua kom muaj zog nqus | Lub zog nqus tau zoo dua; nruj dua-rau- qhov hnyav piv txhim kho cov lus teb zoo |
| Heavy Industrial Foundations | Cov khoom siv nrog siab dynamic loads, rauj foundations, loj compressors | Withstands siab dynamic loads thiab vibration |
| Cov av heev | Cov av mos heev lossis tsis ruaj khov, pob zeb - thaj chaw puv, glacial mus txog | Lub peev xwm siab tshaj plaws ntawm ib pawg mus txog qhov ruaj khov strata nrog tsawg pawg; withstands nyuaj tsav yam tsis muaj kev puas tsuaj |
| Marine Structures | Ports, docks, wharves nyob rau hauv ib puag ncig corrosive | Lub zog zoo nrog cov txheej txheem zoo (epoxy resin, iav flake txheej) rau ntsev corrosion kuj [citation: 2, citation: 10] |
📝 Cov ntsiab lus tseem ceeb
NDT Requirements: Tsis zoo li cov kav dej siab, ASTM A252 tsis yuam 100% NDT ntawm vuam seams tshwj tsis yog tias tau teev tseg. Txawm li cas los xij, rau Qib 3,100% kev kuaj ultrasonicyog tus qauv kev coj ua ntawm cov tuam txhab muaj npe nrov vim yog qhov tseem ceeb ntawm cov ntawv thov [citation: 1, citation: 4].
Thaum twg los xaiv Qib 3 :
Lub peev xwm thauj khoom siab tshaj plaws rau ib pawg yog qhov tseem ceeb vim qhov chaw txwv lossis kev tsim qauv tsim kom zoo
Cov av hnyav heev (mos heev, tsis ruaj khov, lossis xav tau kev nkag mus tob los ntawm cov txheej txheem nyuaj)
Heavy structures requiring the highest foundation strength (high-rises >50 zaj dab neeg, txuas hniav loj, offshore platforms)
Kev tsav tsheb hnyav tau npaj tseg (boulders, glacial till, tuab xuab zeb)
Seismic zones qhov twg dynamic loading thiab lub zog nqus yog qhov tseem ceeb
Marine ib puag ncig uas lub zog siab tshaj plaws - rau - qhov hnyav piv tau txais txiaj ntsig
Weldability Requirements: Qib 3 qhov sib npaug ntawm cov pa roj carbon ntau dua (feem ntau 0.40-0.48%) yuav tsum tau ua raws li cov txheej txheem vuam tsim nyog:
Preheat kub: 100-150℃feem ntau xav tau
Interpass kub tswj
Tsim nyog WPS rau kev sib tw teb
Tshaj tawm -weld soj ntsuam pom zoo
Cov Lus Qhia Ntxiv: Rau cov ntawv thov tseem ceeb, qhia meej:
S1 - Charpy V-Notch: Rau thaj tsam seismic lossis huab cua txias (27J @ -20℃raug)
S4 - Ultrasonic Lamination: Tag nrho lub cev scan rau cov phaj tsis xws luag hauv cov ntawv thov tseem ceeb
S5 - Txhim kho Khoov Test: Sab khoov kuaj rau kev tsav tsheb hnyav
S6 - Los ntawm -Thickness Test: Z-kev taw qhia cov khoom pov thawj rau cov phab ntsa tuab
Kev tiv thaiv corrosion: Rau cov qauv mus tas li, qhia cov txheej txheem tsim nyog raws li ib puag ncig [citation: 1, citation: 2, citation: 6, citation: 10]:
FBE/3 LPE: Rau pawg faus thiab qhov chaw hnyav [citation:1, citation:2]
Epoxy resin / iav flake txheej: Rau cov ntawv thov dej hiav txwv (qhuav zaj duab xis Ntau dua lossis sib npaug rau 300μm)
Coal Tar Epoxy: Rau hnyav-lub luag haujlwm tiv thaiv [citation:1, citation:2]
Kub-dip galvanizing: Rau lifespan 20+ xyoo nyob rau hauv offshore ib puag ncig
Bitumen txheej: Rau kev pabcuam faus [citation:1, citation:2]
Kev xav txog kev teeb tsa :
Cov cuab yeej tsav tsheb: Siab zog rauj feem ntau xav tau vim muaj zog dua
Tsav khau tsim: Reinforced, feem ntau welded los ntawm qib siab steel kom tsis txhob nceb
Kev Saib Xyuas Kev Nyuaj Siab: Pile Tsav analyzer (PDA) pom zoo kom ntseeg tau tias muaj kev ntxhov siab nyob hauv qab qhov kev txwv
Splicing: Tag nrho nkag mus pob tw welds nrog thaub qab kom muaj zog txuas ntxiv
Economic Factors :
Khoom siv tus nqi hwm: 25-40% dhau Qib 2, 60-100% dhau Qib 1
Fabrication Complexity: Siab dua vim vuam tswj
Lub Sijhawm Lead: 6-10 lub lis piam ib txwm (ntev tshaj li qib qis)
Kev txo qis: Txhim kho pawg tsim kom siv tsawg dua / siab dua pawg
Ua kom tiav Specification: Thaum xaj, qhia [citation: 1, citation: 2, citation: 4, citation: 6]:
ASTM A252 Qib 3, SSAW (kauv welded), Loj (OD x WT), Ntev, Xaus Xaus
Txheej txheej: [piv txwv li, liab qab, FBE, 3LPE, epoxy resin, galvanized]
Txhua qhov kev xav tau ntxiv (kev sim hydrostatic, NDT ntxiv, kev sim cuam tshuam)
📝 Cov ntsiab lus
ASTM A252 Qib 3 Kauv Submerged Arc Welded kavyog covhwm, siab tshaj lub zog xaivrau qhov xav tau tshaj plaws hauv paus piling daim ntawv thov raws li ASTM A252 specification [citation: 3, citation: 4, citation: 6, citation: 10]. Nrog yam tsawg kawg nkaus tawm lub zog ntawm45,000-50,000 psi (310-345 MPa)- kwv yees li51% siab dua Qib 1thiab28% siab dua Qib 2- Qib 3 muaj qhov siab tshaj plaws load-cov kabmob muaj peev xwm ib pawg, tso cai rautxog li 40% tsawg pawgpiv rau qib 1 tsim.
Muaj nyob rau hauv diameters los ntawm219mm txog 4000mmnrog phab ntsa thicknesses rau75mm uathiab ntev mus txog50m, cov kav dej no yog tsim los siv tus nqi -Txoj kev tsim khoom SSAW zoo nrog ob npaug -sided submerged arc vuam, ua kom ntseeg tau qhov zoo ntawm weld zoo thiab tsis sib xws lub zog faib [citation: 1, citation: 4, citation: 6, citation: 8]. Lub kauv weld seam muab15-20% siab dua axial compressive zog dua ncaj seam welded yeeb nkabthaum lub sij hawm tsav tsheb, ua rau nws tshwj xeeb tshaj yog haum rau kev thov daim ntawv thov [citation:3, citation:4].
Qib 3 yog qhovhwm kev xaiv rau qhov tseem ceeb infrastructure tej yaam numsuav nrog:
High-cov tsev siab (>50 zaj dab neeg) xav tau lub hauv paus siab tshaj plaws
Loj choj piersnyob rau hauv dej tob nrog hnyav dynamic loads [citation: 4, citation: 10]
Offshore platformsxav tau siab zog-rau- hnyav piv
Seismic aavyuav tsum tau txhim kho lub zog nqus
Cov av heevnrog nyuaj tsav los ntawm nyuaj strata
Rau cov ntawv thov uas xav tau kev lees paub qis -kub toughness, qhia cov kev xav tau ntxiv xws liCharpy V-kev ntsuas qhov cuam tshuam (S1)ntawm -20 degree. Thaum txiav txim, xyuas kom meej tias koj qhia meej cov qauv ua tiav nrog rau qib, kev tsim khoom (SSAW), qhov yuav tsum tau muaj, qhov kawg tiav, thiab cov txheej txheem txheej txheem raws li koj daim ntawv thov tshwj xeeb thiab ib puag ncig [citation: 1, citation: 2, citation: 4, citation: 6].
