ASTM A252 Qib 2 yog cov khoom siv dav tshaj plaws rau kev tsim Kauv Submerged Arc Welded (SSAW) steel kav rau kev siv hauv paus.. Qhov kev sib xyaw ua ke no yog cov khoom lag luam uas muab los ntawm ntau lub tuam txhab thoob ntiaj teb thiab sawv cev rau qhov zoo tshaj qhov sib npaug ntawm lub zog, tus nqi, thiab kev tsim kho rau feem ntau cov lag luam thiab kev lag luam piling project.
Lub npe "ASTM A252 Qib 2 Kauv Submerged Arc Yeeb Nkab" sib txuas cov txheej txheem cov khoom siv tshwj xeeb (ASTM A252) nrog tus nqi -cov txheej txheem kauv vuam zoo (SSAW) los tsim cov kav loj - txoj kab uas hla uas haum rau nruab nrab mus rau siab load-cov ntaub ntawv siv lub hauv paus.
📋 Cov Lus Qhia Tseem Ceeb rau ASTM A252 Qib 2 SSAW Yeeb Nkab
Cov lus hauv qab no qhia txog cov ntsiab lus tseem ceeb rau cov khoom no, raws li kev coj ua hauv kev lag luam thiab cov ntaub ntawv tsim khoom [citation: 1, citation: 6, 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: 6, citation: 8]. |
| Qib Steel | Qib 2: Qib nruab nrab lub zog thiabfeem ntau tau teev tsegrau kev siv piling dav dav, muab qhov sib npaug zoo ntawm kev ua haujlwm thiab kev lag luam [citation: 1, citation: 3, citation: 6]. |
| Kev tsim khoom | Spiral (Helical) Submerged Arc Vuam (SSAW / HSAW / DSAW): Ua los ntawm kub- dov steel coil, nrog cov vuam seam khiav tsis tu ncua nyob rau hauv ib tug kauv raws cov yeeb nkab ntev. Welded siv ob -sided tsis siv neeg submerged arc vuam nrog qhov tob tob tshaj lossis sib npaug rau 1.5 hli [citation: 1, citation: 6, citation: 9]. |
| Tshuaj muaj pes tsawg leeg (max %) [citation:1, citation:6] | Cov pa roj carbon (C): 0.22-0.28% Manganese (Mn): 1.00-1.40% Phosphorus (P):Tsawg dua lossis sib npaug li 0.040% Sulfur (S):Tsawg dua lossis sib npaug li 0.040% Silicon (Si): 0.15-0.40% Lus Cim: ASTM A252 tsis qhia meej txog cov tshuaj muaj pes tsawg leeg, tsuas yog cov khoom siv kho tshuab xwb. Cov txiaj ntsig tau pom yog ib txwm los ntawm cov ntaub ntawv tsim khoom. |
| Mechanical Properties (min) [citation: 1, citation: 6, citation: 8, citation: 10] | Yield zog:240-290 MPa (35,000-42,000 psi) Tensile zog:415-455 MPa (60,000-66,000 psi) Elongation:14-25% (nws txawv ntawm phab ntsa tuab thiab ntsuas qhov ntev) |
| Hom Loj Ntau Yam [citation: 1, citation: 4, citation: 6, citation: 9] | Sab nraud txoj kab uas hla:219mm txog 4064mm (kwv yees . 8" rau 160") Phab ntsa Thickness:3.2mm txog 50.8mm (ntau ntau 6-30mm) Ntev:3 m rau 24 m txheem; mus txog 50 m muaj los ntawm kev txiav txim tshwj xeeb |
| Common Applications [citation: 1, citation: 3, citation: 6, citation: 9] | Lub Hauv Paus Tsev: Nruab nrab-cov tsev nce siab, cov hauv paus cog kev lag luam, siab- nce tob hauv paus (ib pawg muaj peev xwm Ntau dua lossis sib npaug rau 8000kN) [citation:3, citation:6] Kev tsim kho choj: Pier thiab abutment txhawb nqa hla- tus choj dej hiav txwv [citation:1, citation:6] Marine Structures: Chaw nres nkoj, wharves, docks yuav tsum tau corrosion-resistant coatings [citation:1, citation:6] Infrastructure Projects: Transmission tower foundations, retaining walls, heavy equipment supports [citation:3, citation:9] Tej hauj lwm ib ntus: Kev txhawb nqa lub hauv paus, kev tsim kho platforms (phab ntsa thickness 6-10mm, tus nqi 15% qis dua Gr.3) |
| Cov Kev Ntsuas Tseem Ceeb [citation: 1, citation: 6, citation: 7, citation: 10] | 100% Kev Ntsuas Ultrasonic (UT)ntawm weld seam [citation: 1, citation: 6] Hydrostatic Test: Xaiv tau rau kev siv piling; Txhua cov yeeb nkab tau sim ntawm 2 × ua haujlwm siab rau ntau dua lossis sib npaug li 15 vib nas this yog tias tau teev tseg [citation: 3, citation: 6] Khoov Test: 180℃khoov kuaj ntawm cov qauv weld kom paub tseeb ductility Tshuaj ntsuam xyuas: Rau qhov cua sov / ntau Kev Ntsuas Tensile: Rau ntau Flattening Test: Txheeb xyuas qhov ductility Dimensional soj ntsuam: Raws li ASTM A252 Table 2 tolerances |
| Daim ntawv pov thawj | Mill Test Certificate feem ntau rauEN 10204 / 3.1Bnrog tshuaj ntsuam xyuas, cov khoom siv kho tshuab, thiab NDT cov txiaj ntsig [citation: 6, citation: 7]. Thib peb-kev tshuaj xyuas los ntawm SGS, BV, Lloyds muaj. |
📊 ASTM A252 Qib Sib Piv
Cov lus hauv qab no sib piv peb qib hauv ASTM A252 [citation: 1, citation: 8, citation: 10]:
| Qib | Yield zog (min) | Tensile zog (min) | Elongation (min) | Daim ntawv thov |
|---|---|---|---|---|
| Qib 1 | 205 MPa (30,000 psi) | 345 MPa (50,000 psi) | 30% | Lub teeb-load daim ntawv thov, cov av zoo, cov qauv ib ntus, kev xaiv nyiaj txiag [citation:8, citation:10] |
| Qib 2 | 240-290 MPa (35,000-42,000 psi) | 415-455 MPa (60,000-66,000 psi) | 14-25% | Qib feem ntau- sib npaug lub zog rau nruab nrab- cov tsev nce, choj hauv paus, cov nroj tsuag muaj kev lag luam, cov qauv dej hiav txwv [citation: 1, citation: 6] |
| Qib 3 | 310 MPa (45,000 psi) | 455 MPa (66,000 psi) | 20% | Hnyav-load daim ntawv thov, txuas hniav loj, offshore platforms, seismic zones, nyuaj tsav tsheb [citation:8, citation:10] |
Kev nce feem pua:Qib 2 muaj kwv yees li17-20% siab tshaj tawm lub zog tshaj Qib 1, thaum Qib 3 muaj kwv yees li30% siab dua Qib 2[siv: 1, citation: 8].
🔍 Cov ntsiab lus tseem ceeb kom nkag siab
"Qib 2" txhais li casASTM A252 Qib 2 yog covfeem ntau qhia qibrau steel yeeb nkab pawg, muab qhov zoo sib npaug ntawm lub zog thiab kev lag luam [citation: 1, citation: 3]. Nrog rau qhov tsawg kawg nkaus lub zog ntawm 35,000{11}}42,000 psi (240-290 MPa) thiab tensile lub zog ntawm 60,000-66,000 psi (415-455 MPa), nws yog haum rau feem ntau coj mus muag thiab industrial foundation daim ntaub ntawv uas nruab nrab mus rau siab load-bearing muaj peev xwm yuav tsum tau.
Optimal Strength - rau - Tus nqi piv: Qib 2 muab tus nqi zoo tshaj plaws ntawm peb qib rau ntau daim ntawv thov, ua15-25% tus nqi siab dua Qib 1 tab sis 15-20% tus nqi qis dua Qib 3, thaum muab lub zog txaus rau cov av ib txwm muaj thiab lub tsev loads [citation: 1, citation: 6].
Manufacturing Flexibility: Tus qauv ASTM A252 tso cai rau ntau yam kev tsim khoom, suav nrogKauv submerged arc vuam (SSAW), longitudinal submerged arc vuam (LSAW), hluav taws xob tsis kam vuam (ERW), thiab seamless[siv: 1, citation: 8]. Qhov no muab cov neeg tsim khoom yooj yim los tsim cov kav dej Qib 2 siv cov txheej txheem kev lag luam tshaj plaws rau qhov xav tau loj.
SSAW Qhov Zoo rau Qib 2: Cov txheej txheem welding yog tshwj xeeb tshaj yog zoo - haum rau loj - txoj kab uas hla Qib 2 kav vim [citation:1, citation:9]:
Kev Nyuaj Siab: Kauv weld seam disperses kev ntxhov siab ntau dua ib ncig ntawm lub voj voog, muab 15-20% siab dua axial compressive zog dua ncaj seam welded yeeb nkab
Nqi Efficiency: Loj - txoj kab uas hla tuaj yeem ua los ntawm cov hlau nqaim nqaim nrog lub kaum ntse ntse kho tau, txo cov khoom siv raw khoom pov tseg
Txoj kab uas hla Flexibility: Tib steel skelp tuaj yeem tsim ntau txoj kab uas hla los ntawm kev kho lub kaum sab xis
Ntev ntev: tuaj yeem ua tiav cov yeeb nkab ntev ntev (txog 50m) txo cov kev xav tau ntawm kev sib tshuam
Kev Tswj Xyuas Zoo: Tsis zoo li cov kav dej siab, ASTM A252 tsistxoj caiqee qhov kev tswj xyuas qhov zoo tshwj tsis yog hais los ntawm tus neeg yuav khoom. Txawm li cas los xij, cov tuam ntxhab feem ntau muab [citation: 1, citation: 6]:
100% Ultrasonic kuaj: Tsis siv neeg qhov tsis pom kev ntawm vuam seam (rhiab heev yuav tsum tau ua raws li cov qauv cai)
Kev tshuaj xyuas Weld: Kev txheeb xyuas cov kab nrib pleb, tsis muaj fusion, thiab lwm yam tsis xws luag
Kev Ntsuas Hydrostatic: Thaum teev los ntawm tus neeg yuav khoom (txhua cov yeeb nkab kuaj ntawm 2 × ua haujlwm siab rau ntau dua lossis sib npaug li 15 vib nas this)
🔧 Kev Tsim Nyog rau ASTM A252 Qib 2 SSAW Yeeb Nkab
Cov txheej txheem tsim khoom ua raws li cov txheej txheem SSAW ntau lawm nrog kev tswj xyuas zoo [citation: 1, citation: 6, citation: 9]:
| Kauj ruam | Kev piav qhia |
|---|---|
| 1. Kev npaj cov khoom nyoos | Kub- dov steel coils ntsib ASTM A252 Qib 2 qhov yuav tsum tau ua yog qib, txiav, thiab npaj los xyuas kom meej qhov zoo raws li qhov tshwj xeeb. |
| 2. Ntug Milling | Cov npoo npoo yog precision-milled los tsim qhov tseeb bevel geometry rau vuam. |
| 3. Kauv sib sau | Lub sawb txuas ntxiv tsim rau hauv cov duab cylindrical ntawm lub kaum ntse ntse tshwj xeeb uas siv lub tshuab tsim. |
| 4. Submerged Arc Vuam | Muab ob npaug rau-sided tsis siv neeg submerged arc vuam (sab hauv thiab sab nraud) tsim cov kauv seam nrog qhov tob tob Ntau dua lossis sib npaug li 1.5mm . |
| 5. Kev soj ntsuam zoo | 100% ultrasonic tsis siv neeg qhov tsis pom kevntawm weld seam; kev soj ntsuam rhiab heev yuav tsum ua raws li cov qauv kev cai. Kev ntsuas hydrostatic ntawm 2 × ua haujlwm siab rau ntau dua lossis sib npaug li 15 vib nas this yog tias tau teev tseg. |
| 6. Tshaj tawm -Kev ua haujlwm | Yeeb nkab kawg machining los tswj qhov kawg lub ntsej muag perpendicularity thiab bevel kaum sab xis (tus qauv 30℃bevel nrog lub hauv paus ntsej muag). |
| 7. Kev tiv thaiv corrosion | Kev tiv thaiv - daim ntawv thov txheej corrosion (epoxy resin, iav flake txheej, 3PE, thiab lwm yam) los tiv thaiv ib puag ncig corrosive . |
📏 Dimensional Tolerances
ASTM A252 qhia txog cov kev kam rau siab hauv qab no rau SSAW kav [citation: 1, citation: 6, citation: 9]:
| Parameter | Ua siab ntev |
|---|---|
| Sab nraud txoj kab uas hla (tsawg dua los yog sib npaug rau 508mm) | ± 1% lossis ± 1.0mm (qhov twg ntau dua) |
| Outside Diameter (>508 hli) | ± 1% lossis ± 4.0mm (qhov twg ntau dua) |
| Phab ntsa Thickness | +12.5% / -10% ntawm nominal |
| Kev ncaj | Tsawg dua lossis sib npaug li 0.1% ntawm tag nrho qhov ntev |
🏭 Daim Ntawv Thov Kom Paub meej
Permanent Load-Cov Qauv Kabmob[siv: 3, citation: 6]:
Choj Pile Foundations: Pier thiab abutment kev them nyiaj yug rau tus ntoo khaub lig- tus choj / dej hiav txwv (pile txoj kab uas hla Ntau dua los yog sib npaug rau 609mm, dynamic load resistant)
High-Rise Building Deep Foundations: Core tube pawg hauv paus rau ultra- siab- cov tsev nce siab (ib pawg kabmob muaj peev xwm Ntau dua lossis sib npaug rau 8000kN)
Industrial Plant Foundations: Cov cuab yeej siv hnyav hnyav (Qib 2 muab tus nqi zoo dua -kev ua tau zoo dua Qib 3)
Ports thiab Wharves: Yuav tsum tau epoxy resin txheej (qhuav zaj duab xis Ntau dua los yog sib npaug rau 300μm, ntsev corrosion resistant)
Tej hauj lwm ib ntus :
Foundation Pit Support Piles: Sib sib zog nqus lub hauv paus kev txhawb nqa rau subways / lub tsev (phab ntsa thickness 6-10mm, tus nqi 15% qis dua Qib 3)
Kev Tsim Kho Platform Txhawb: Ib ntus wharves, choj erecting tshuab platforms (nrawm installation, recyclable)
Hnyav Environmental Engineering :
Offshore Structures: Cov pas dej da dej / pas dej tiv thaiv pawg (Qib 2 + kub-dip galvanizing, lifespan 20+ xyoo)
Av Corrosion Zones: Kis ntauwd foundations (siv 3PE txheej rau tshuaj corrosion kuj)
Marine Environments: Wharves, docks xav tau corrosion-cov coatings resistant
📝 Cov ntsiab lus tseem ceeb
Cov Lus Qhia Ntxiv: Rau cov ntawv thov tseem ceeb uas xav tau kev txhim kho toughness lossis tawg tsis kam, qhia cov kev xav tau ntxiv xws li:
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)
S5: Ntxiv ductility pov thawj
Kev xav txog kev teeb tsa :
Txoj Kev Tsav Tsheb: Impact rauj, vibratory tsav tsheb, los yog jacking nyob ntawm cov av tej yam kev mob
Tsav khau: Pom zoo rau qhov nyuaj strata los tiv thaiv qhov kawg deformation thaum tsav tsheb
Phab ntsa Thickness xaiv: Raws li kev tsav tsheb nyuaj; phab ntsa tuab rau kev tsav tsheb nyuaj
Field Vuam: Tag nrho - nkag mus rau pob tw welds xav tau rau kev sib txuas sib txuas
Kev tiv thaiv corrosion: Coatings thiab/los yog cathodic tiv thaiv tseem ceeb rau kev txhim kho mus tas li
Ua kom tiav Specification: Thaum txiav txim, qhia meej: ASTM A252 Qib 2, SSAW (kauv welded), Qhov Loj (OD x WT), Ntev, Qhov Kawg Finish (dawb lossis beveled), thiab lwm yam kev xav tau ntxiv xws li NDT, hydrostatic testing, lossis txheej [citation: 1, citation: 6].
Kev Tiv Thaiv Qhov Nto: Cov kav dej tuaj yeem muab tau nrog ntau txheej txheej rau kev tiv thaiv corrosion [citation: 5, citation: 6, citation: 7]:
Fusion Bond Epoxy (FBE)
3-txheej polyethylene (3PE)
Coal Tar Epoxy
iav flake txheej
Kub-dip galvanizing
Bitumen txheej
Cov roj dub los yog cov txheej txheem vanish (ntev)
Xaus Xaus: Muaj cov kev kho mob kawg suav nrog [citation:3, citation:9]:
Plain xaus
Beveled xaus (txheej txheem 30℃bevel nrog lub hauv paus ntsej muag rau thaj chaw vuam)
Xov nrog coupling (BSP lossis NPT)
Grooved xaus
Chaw tsim tshuaj paus muaj: Ntau lub tuam txhab sau npe ASTM A252 Qib 2 raws li tus qauv tshwj xeeb rau lawv cov khoom siv SSAW yeeb nkab, nrog rau kev tsim muaj peev xwm ntawm 219mm txog 4064mm inch [citation: 1, citation: 2, citation: 4, citation: 6].
💡 Thaum xaiv ASTM A252 Qib 2 SSAW Yeeb Nkab
XaivASTM A252 Qib 2 Kauv Submerged Arc Welded yeeb nkabThaum [citation: 1, citation: 3, citation: 6]:
Daim ntawv thov yuav tsum taunruab nrab mus rau siab load- bearing peevrau cov qauv ruaj khov
Tej tsev loadsrau nruab nrab- cov tsev nce siab (txog 30-50 dab neeg)
Choj foundations nrognruab nrab loads thiab dynamic rog
General av tej yam kev mobqhov twg huab tsav tsis kam yuav tsis tau
Cov phiaj xwm xav tau ib qhozoo tshaj qhov sib npaug ntawm kev ua tau zoo, tus nqi, thiab muaj
Marine lossis waterfront structuresxav tau lub zog zoo nrog kev tiv thaiv corrosion
Daim ntawv thov qhov twgQib 1 lub zog tsis txaus tab sis Qib 3 dhau lawm - qhia
Tus nqi -kev ua tau zooyog ib qho tseem ceeb - Qib 2 muab tus nqi zoo tshaj plaws rau feem ntau kev lag luam thiab kev lag luam
Rau kev thov ntau ntxiv nrog rau:
loads siab heevlos yognyuaj tsav tej yam kev mob(boulders, tuab xuab zeb, glacial mus txog)
Deepwater marine structureslos yogoffshore platforms
Seismic aavyuav tsum tau txhim kho toughness
Arctic lossis qis -kev pabcuam kubyuav tsum tau guaranteed tej yam khoom
Qib 3 yuav tsum tau teev tsegnrog cov kev cai ntxiv uas tsim nyog [citation:1, citation:8].
📝 Cov ntsiab lus
ASTM A252 Qib 2 Kauv Submerged Arc Welded kavyog covtus qauv thiab feem ntau hais txog kev xaiv rau kev siv hauv paus pilingthoob ntiaj teb [citation:1, citation:3]. Cov kav dej no muab cov txheej txheem tsim khoom lag luam SSAW nrog qib siab lub zog ntawm ASTM A252 tus qauv piling, muab ib qhozoo heev sib npaug ntawm kev ua tau zoo, nqi, thiab muaj .
Nrog yam tsawg kawg nkaus tawm lub zog ntawm35,000-42,000 psi (240-290 MPa)thiab tensile zog ntawm60,000-66,000 psi (415-455 MPa), Qib 2 muabmuaj zog txaus rau feem ntau kev lag luam thiab kev lag luam sivsuav nrog cov tsev nruab nrab- nce siab, choj hauv paus, cov nroj tsuag kev lag luam, thiab cov qauv hauv hiav txwv [citation:1, citation:6].
Cov txheej txheem spiral welding enables zus tau tej cov kav dej nrogCov kab loj loj (txog 160 "+), cov phab ntsa tuab (txog 50mm), thiab ntev ntev (txog 50m)ntawm cov nqi sib tw, thaum lub spiral seam faib kev ntxhov siab ntau sib npaug ntawm ib ncig, muab15-20% siab dua axial compressive zog dua ncaj seam welded yeeb nkab[npe: 1, citation: 3, citation: 4, citation: 9].
Thaum qhia meej, xyuas kom koj siv cov qauv ua tiav nrog Qib 2, qhov ntev yuav tsum tau, thiab cov kev xeem ntxiv lossis txheej txheej raws li koj daim ntawv thov tshwj xeeb thiab ib puag ncig [citation: 1, citation: 6].
