ASTM A252 Qib 3 ERW Yeeb Nkab
Lub ntsiab lus tseem ceeb
ASTM A252 Qib 3 ERW (Electric Resistance Welded) yeeb nkabyog covqib siab zogNyob rau hauv ASTM A252 specification rau steel yeeb piles [citation: 2, citation: 4, citation: 5]. Cov qib hwm no yog tsim los rau cov kev thov hauv paus uas xav tau ntau tshaj qhov load-cov kabmob muaj peev xwm, xws li siab- nce lub hauv paus, cov choj loj, cov chaw sab nrauv, thiab cov qauv hauv hiav txwv [citation: 2, citation: 4, citation: 9].
Lub npe piav qhia
| Ib feem | Lub ntsiab lus |
|---|---|
| ASTM | ASTM International (American Society for Testing and Materials) |
| A252 | Txheem specification rau welded thiab seamless steel yeeb nkab pawg [citation: 6, citation: 8] |
| Qib 3 | Covqib siab zognyob rau hauv A252 specification, nrog yam tsawg kawg nkaus yield zog ntawm45,000 psi (310 MPa)[siv: 2, citation: 4, citation: 5] |
| ERW | Hluav taws xob Resistance Welded - yeeb nkab tsim los ntawm steel kauj thiab welded longitudinally yam tsis muaj muab tub lim hlau [citation: 4, citation: 6, citation: 7] |
Cov yam ntxwv tseem ceeb
| Feature | Kev piav qhia |
|---|---|
| Daim ntawv thov tseem ceeb | Heavy- lub hauv paus piling, sib sib zog nqus foundations, mus tas li load- nqa cov tswv cuab [citation:4, citation:5, citation:9] |
| Kev tsim khoom | Electric Resistance Welded (ERW) - txias sib sau nrog siab- zaus vuam [citation:4, citation:6, citation:7] |
| Yield zog (min) | 310 MPa (45,000 psi)[npe: 2, citation: 3, citation: 4, citation: 5, citation: 8] |
| Tensile zog (min) | 455 MPa (66,000 psi)[npe: 2, citation: 3, citation: 4, citation: 5, citation: 8] |
| Elongation (min) | 20%(hauv 2 nti) [citation: 3, citation: 5] |
| Qhov Loj Loj (ERW) | NPS 1 txog NPS 24 (33.4 mm txog 609.6 mm OD); loj diameters muaj nyob ntawm kauv los yog LSAW [citation:2, citation:4, citation:7] |
| Phab ntsa Thickness | Thickest ntawm A252 qib; mus txog 1 nti (25.4 mm) lossis ntau dua [citation: 4, citation: 7] |
| Ntev | Min 3 m, Max 18 m txheem; mus txog 70 m muaj rau cov ntawv thov tshwj xeeb [citation: 4, citation: 7] |
| Kev kho saum npoo | Liab qab, dub kua roj vanish, galvanized, FBE, los yog 3PE coated [citation: 2, citation: 4, citation: 9] |
Tshuaj muaj pes tsawg leeg
ASTM A252 qhia tshwj xeeb tshaj yog txwv rau phosphorus. Tag nrho peb qib sib koom tib yam kev txwv [citation: 3, citation: 5, citation: 7, citation: 8, citation: 10]:
| Element | Ntau tshaj % |
|---|---|
| Cov pa roj carbon (C) | 0.26-0.30% (tus nqi) |
| Manganese (Mn) | 1.35% (tus nqi) |
| Silicon (Si) | 0.45% (tus nqi) |
| Phosphorus (P) | 0.050%(yuav tsum tau) [citation: 3, citation: 5, citation: 8, citation: 10] |
| Sulfur (S) | 0.045% (tus nqi) |
Lus Cim: Tus qauv tsuas yog tswj hwm qhov siab tshaj plaws phosphorus. Cov pa roj carbon, manganese, thiab silicon qhov tseem ceeb tau qhia yog ib yam los ntawm cov ntaub ntawv tsim khoom. Qib 3 tuaj yeem muaj cov chromium ntxiv, tooj liab, thiab molybdenum kom muaj zog dua thiab tiv thaiv corrosion.
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) [citation: 3, citation: 8] | 345 MPa (50,000 psi) [citation: 3, citation: 8] | 30% | Lub hauv paus |
| Qib 2 | 240 MPa (35,000 psi) [citation: 3, citation: 8] | 415 MPa (60,000 psi) [citation: 3, citation: 8] | 25% | +17% tawm |
| Qib 3 | 310 MPa (45,000 psi)[siv: 2, citation: 3, citation: 5, citation: 8] | 455 MPa (66,000 psi)[siv: 2, citation: 3, citation: 5, citation: 8] | 20%[Citation: 3, Citation: 5] | +50% tawm |
Dimensional Tolerances
| Parameter | Ua siab ntev |
|---|---|
| Sab nraud txoj kab uas hla | ± 1% ntawm cov ntawv teev tseg OD [citation: 5, citation: 7, citation: 10] |
| Phab ntsa Thickness | Tsis ntau tshaj 12.5% nyob rau hauv nominal [citation: 5, citation: 7, citation: 10] |
| Qhov hnyav | +15% / -5% ntawm qhov hnyav theoretical [citation:3, citation:5, citation:10] |
| Ntev | ± 1 nti (± 25.4 hli) rau qhov ntev ntev [citation: 5, citation: 10] |
Kev xeem yuav tsum tau
| Hom kev xeem | Kev xav tau |
|---|---|
| Tshuaj ntsuam xyuas | Yuav tsum tau ntsuas kub; phosphorus txwv tswj [citation:3, citation:5] |
| Tensile Test | Ib qho kev xeem rau 200 qhov ntev; txheeb xyuas cov txiaj ntsig thiab lub zog tensile [citation: 8, citation: 10] |
| Flattening Test | Yuav tsum muaj rau kev txheeb xyuas qhov tseeb ntawm weld |
| Hydrostatic Test | Tsis tau teev tseg- Cov kav dej piling tau ntim nrog cov pob zeb, tsis yog siv rau kev thauj mus los [citation: 8, citation: 10] |
Daim ntawv thov
Qib 3 yog qhov kev xaiv zoo tshaj plaws rau cov ntawv thov piling uas xav tau tshaj plaws [citation: 4, citation: 9]:
| Daim ntawv thov | Kev piav qhia |
|---|---|
| High-Rise Building Foundations | Lub hauv paus tob rau skyscrapers thiab cov qauv siab; txhawb nqa mus txog 45,000 psi tawm los [citation: 4, citation: 9] |
| Cov choj loj | Lub hauv paus tseem ceeb ntawm lub hauv paus rau kev hla - tus choj hla dej / hiav txwv [citation: 2, citation: 4, citation: 6] |
| Offshore Platforms | Cov qauv hauv hiav txwv, chaw nres nkoj, wharves yuav tsum muaj corrosion-cov coatings resistant [citation:2, citation:4, citation:9] |
| Heavy Industrial Foundations | Cov cuab yeej siv hauv paus yuav tsum muaj peev xwm thauj khoom siab tshaj plaws |
| Seismic Zones | Cov qauv yuav tsum tau txhim kho lub zog nqus thiab ductility |
| Cov av heev | Cov av mos heev los yog tsis ruaj khov yuav tsum tau muaj peev xwm ntau tshaj plaws |
Qhov Zoo Tshaj Plaws
| Qhov zoo | Kev piav qhia |
|---|---|
| Lub zog siab tshaj | 50% lub zog tawm los ntau dua li Qib 1 - tso cai rau cov pawg tsawg dua lossis muaj peev xwm ntau dua |
| Phab ntsa Thickness | Maximum load-cov kabmob muaj peev xwm rau lub hauv paus tob |
| Cov qauv zoo heev kev ncaj ncees | Resistant deformation nyob rau hauv hnyav compression thiab hnyav tsav tsheb [citation: 3, citation: 4] |
| Superior Durability | Withstands hnyav tsav quab yuam los ntawm pawg tsav tsheb |
| Galvanizing / Coatings Muaj | FBE, 3PE, thiab kub-dip galvanized xaiv rau kev tiv thaiv corrosion [citation: 2, citation: 4, citation: 9] |
Kev txiav txim siab tseem ceeb
1. ERW Loj Cov Kev Txwv
ERW manufacturing feem ntau yog siv rau qhov ntau thiab tsawg mus txog NPS 24 (24 nti OD) [citation: 2, citation: 4, citation: 7]
Cov kab uas loj dua yuav tsum tau HSAW (kauv) lossis LSAW manufacturing [citation: 4, citation: 6]
2. Kev Taw Qhia Qib
Qib 1: Lub teeb-load daim ntawv thov, cov av zoo, cov qauv ib ntus
Qib 2: Feem ntau qib – nruab nrab- cov tsev nce, cov piling dav dav [citation:2, citation:4]
Qib 3: Qib hwm- hnyav-load daim ntawv thov, sib sib zog nqus foundations, marine structures [citation:4, citation:9]
3. Tsis muaj Hydrostatic Test
ASTM A252 tsis tas yuav tsum tau kuaj hydrostatic vim tias cov kav dej piling tau ntim nrog cov pob zeb thiab tsis siv rau cov kua xa tawm [citation: 8, citation: 10]
Qhov no txawv ntawm cov qauv yeeb nkab siab xws li ASTM A53 lossis API 5L
4. Xaus tiav
Plain xaus: Txheem rau feem ntau daim ntawv thov
Beveled xaus: Rau qhov chaw vuam, 30℃bevel kaum sab xis (+5℃, -0℃) [citation:2, citation:10]
Xov: Muaj raws li qhov kev thov
5. Txheej txheej xaiv
Dub (dawb): Standard tiav
Kub-dip galvanized: Rau kev tiv thaiv corrosion nyob rau sab nraum zoov / marine ib puag ncig [citation: 2, citation: 4]
FBE/3PE: Rau faus lossis marine daim ntaub ntawv [citation:4, citation:9]
Varnish: Kev tiv thaiv ib ntus thaum khaws cia thiab tuav
6. Muaj peev xwm Fabrication
Nws tuaj yeem raug txiav kom ntev, beveled, thiab spliced kom tau raws li qhov project tshwj xeeb
AWS D1.1 certified welders available for field fabrication
Pile beveling qauv muaj xws li "txiav mus rau 30º beveled ces kaum" thiab weld puv
7. Tus nqi siab dua
Qib 3 commands tus nqi vim muaj zog dua thiab cov ntsiab lus alloy
Tus nqi ntawm cov khoom siv yog tsim nyog rau cov ntawv thov tseem ceeb uas yuav tsum muaj lub zog siab tshaj plaws
Qeb Sib piv cov ntsiab lus
| Khoom | Qib 1 | Qib 2 | Qib 3 |
|---|---|---|---|
| Yield zog | 205 MPa | 240 MPa | 310 MPa |
| Tensile zog | 345 MPa rau | 415 MPa rau | 455 MPa rau |
| Elongation | 30% | 25% | 20% |
| Kwv tij muaj zog | Lub hauv paus | +17% | +50% |
| Phab ntsa Thickness | Nyias | Nruab nrab | tuab |
| Daim ntawv thov | Lub teeb loads, ntiav cov hauv paus | General piling, nruab nrab -depth | Heavy loads, sib sib zog nqus foundations, offshore |
Cov ntsiab lus
ASTM A252 Qib 3 ERW yeeb nkabyog covhwm, siab tshaj zog specificationrau steel yeeb nkab pawg hauv kev tsim kho [citation: 2, citation: 4, citation: 5]. Nrog yam tsawg kawg nkaus tawm lub zog ntawm45,000 psi (310 MPa) – 50% siab dua Qib 1- thiab tensile lub zog ntawm66,000 psi (455 MPa), Qib 3 yog tsim los rau cov kev xav tau tshaj plaws uas yuav tsum tau muaj kev thauj khoom siab tshaj plaws -cov kabmob muaj peev xwm [citation:4, citation:9].
Cov yam ntxwv tseem ceeb:
Tsim los ntawm ERW txheej txheem - qhov ntau thiab tsawg mus txog NPS 24 (24 nti OD) [citation: 2, citation: 4]
Thickest phab ntsa thickness ntawm A252 qib rau siab tshaj plaws load peev xwm
Tsis muaj kev sim hydrostatic yuav tsum tau - cov kav dej tau ntim nrog cov pob zeb, tsis siv rau kev xa dej [citation: 8, citation: 10]
20% tsawg kawg elongation - muab ductility txaus rau kev teeb tsa
Ntau yam txheej txheej muaj (FBE, 3PE, galvanized) rau kev tiv thaiv corrosion [citation: 4, citation: 9]
Cov ntawv thov tseem ceeb suav nrog:
High-nce tsev hauv paus thiab skyscrapers [citation:4, citation:9]
Loj choj piers thiab marine lug [citation:2, citation:4]
Offshore platforms thiab docks [citation: 2, citation: 4, citation: 9]
Heavy industrial foundations
Sib sib zog nqus hauv paus piling nyob rau hauv huab cua tej yam kev mob
Thaum txiav txim, qhia meej: kom muaj nuj nqis, ASTM A252 Qib 3, ERW, sab nraud txoj kab uas hla, phab ntsa tuab, ntev, thiab qhov kawg tiav (dawb lossis beveled). Rau cov ntawv thov tseem ceeb hauv ib puag ncig corrosive, xav txog kev qhia FBE, 3PE, lossis kub-dip galvanized coatings [citation:4, citation:9].
