ASTM A252 Qib 2 ERW Yeeb Nkab
Lub ntsiab lus tseem ceeb
ASTM A252 Qib 2 ERW (Electric Resistance Welded) yeeb nkabyog covfeem ntau siv qibHauv ASTM A252 specification rau steel yeeb nkab pawg [citation: 2, citation: 3]. Nws sawv cev rau cov qauv kev xaiv rau kev siv lub hauv paus piling, muab qhov zoo tshaj qhov sib npaug ntawm lub zog, weldability, thiab tus nqi -effectiveness rau nruab nrab mus rau siab-load-cov qauv bearing [citation:2, citation:4]. Cov kav dej no ua haujlwm ruaj khov- nqa cov tswv cuab lossis ua lub plhaub rau cam khwb cia- hauv- tso cov pob zeb ua vaj tse hauv lub hauv paus, txuas hniav, thiab cov qauv hauv hiav txwv [citation:3, citation:5].
Lub npe piav qhia
| Ib feem | Lub ntsiab lus |
|---|---|
| ASTM | ASTM International (American Society for Testing and Materials) |
| A252 | Standard specification rau welded thiab seamless steel yeeb nkab pawg [citation: 3, citation: 9] |
| Qib 2 | CovQib nruab nrab lub zog- feem ntau tau teev tseg rau kev siv piling dav dav, nrog qhov tsawg kawg nkaus lub zog ntawm 35,000 psi (240 MPa) [citation: 2, citation: 3] |
| ERW | Hluav taws xob Resistance Welded - yeeb nkab tsim los ntawm steel kauj thiab welded longitudinally yam tsis muaj muab tub lim hlau [citation: 3, citation: 5] |
Cov yam ntxwv tseem ceeb
| Feature | Kev piav qhia |
|---|---|
| Daim ntawv thov tseem ceeb | Lub hauv paus piling rau cov tsev, txuas hniav, docks, thiab marine lug [citation:2, citation:4] |
| Kev tsim khoom | Electric Resistance Welded (ERW) - txias sib sau nrog siab - zaus vuam [citation:3, citation:5] |
| Yield zog (min) | 240 MPa (35,000 psi)[siv: 2, citation: 3, citation: 8] |
| Tensile zog (min) | 415 MPa (60,000 psi)[siv: 2, citation: 3, citation: 8] |
| Elongation (min) | 25%(siv los ntawm phab ntsa thickness) [citation: 3, citation: 8, citation: 9] |
| Qhov Loj Loj (ERW) | NPS 1 txog NPS 24 (33.4 mm txog 609.6 mm OD) [citation: 3, citation: 10] |
| Phab ntsa Thickness | 3 hli mus rau 16 hli raug rau ERW; mus txog 25.4 hli rau lwm txoj kev tsim khoom [citation: 3, citation: 5, citation: 10] |
| Ntev | Min 3 m, Max 18 m txheem; mus txog 70 m muaj rau cov ntawv thov tshwj xeeb [citation:3, citation:5] |
| Kev kho saum npoo | Liab qab, dub kua roj vanish, los yog galvanized [citation: 2, citation: 3] |
Tshuaj muaj pes tsawg leeg
ASTM A252 tsuas yog txwv qhov siab tshaj plaws rau phosphorus thiab sulfur. Tag nrho peb qib muaj tib qhov txwv tsis pub muaj:
| Element | Ntau tshaj % | Sau ntawv |
|---|---|---|
| Cov pa roj carbon (C) | 0.26% (tus nqi) | Tsis yuam los ntawm tus qauv |
| Manganese (Mn) | 1.60% (tus nqi) | Tsis yuam los ntawm tus qauv |
| Silicon (Si) | 0.45% (tus nqi) | Tsis yuam los ntawm tus qauv |
| Phosphorus (P) | 0.050% | Yuav tsum txwv [citation:3, citation:9] |
| Sulfur (S) | 0.030% | Yuav tsum txwv [citation:3, citation:9] |
Lus Cim: Tus qauv tsuas yog tswj hwm qhov siab tshaj plaws phosphorus thiab sulfur. Cov pa roj carbon, manganese, thiab silicon qhov tseem ceeb tau qhia yog ib yam los ntawm cov ntaub ntawv tsim khoom.
Mechanical Properties
| Qib | Yield zog (min) | Tensile zog (min) | Elongation (min) | Lub zog vs. Qib 1 |
|---|---|---|---|---|
| Qib 1 | 205 MPa (30,000 psi) [citation: 8, citation: 9] | 345 MPa (50,000 psi) [citation: 8, citation: 9] | 30% [citation: 3, citation: 9] | Lub hauv paus |
| Qib 2 | 240 MPa (35,000 psi)[siv: 2, citation: 8, citation: 9] | 415 MPa (60,000 psi)[siv: 2, citation: 8, citation: 9] | 25%[nqe: 3, citation: 9] | +17% tawm |
| Qib 3 | 310 MPa (45,000 psi) [citation: 8, citation: 9] | 455 MPa (66,000 psi) [citation: 8, citation: 9] | 20% [citation: 3, citation: 9] | +51% tawm |
Dimensional Tolerances
| Parameter | Ua siab ntev |
|---|---|
| Sab nraud txoj kab uas hla | ± 1% ntawm cov ntawv teev tseg OD [citation: 3, citation: 5, citation: 9] |
| Phab ntsa Thickness | Tsis ntau tshaj 12.5% nyob rau hauv nominal [citation:3, citation:5] |
| Qhov hnyav | +15% / -5% ntawm qhov hnyav theoretical |
| Kev ncaj | Tsawg dua lossis sib npaug li 0.1% ntawm tag nrho qhov ntev (tus qauv) |
Kev xeem yuav tsum tau
| Hom kev xeem | Kev xav tau |
|---|---|
| Tshuaj ntsuam xyuas | Yuav tsum tau ntsuas kub; phosphorus thiab sulfur txwv txwv |
| Tensile Test | Ib qho kev xeem rau 200 qhov ntev; txheeb xyuas qhov tawm los thiab lub zog tensile |
| 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 pob zeb, tsis siv rau kev xa dej |
Daim ntawv thov
Qib 2 yog tus qauv xaiv rau feem ntau daim ntawv thov piling [citation:2, citation:4]:
| Daim ntawv thov | Kev piav qhia |
|---|---|
| Choj Foundations | Pier thiab abutment kev them nyiaj yug rau hla - tus choj dej / hiav txwv |
| High-Rise Building Foundations | Core tube pawg hauv paus rau nruab nrab mus rau siab -cov tsev nce siab |
| Marine Structures | Chaw nres nkoj, docks, wharves xav tau corrosion-cov coatings resistant [citation:2, citation:4] |
| Industrial Plant Foundations | Heavy equipment foundation pawg |
| Kev tuav phab ntsa | Lateral av siab kuj |
| Tej hauj lwm ib ntus | Lub hauv paus kev txhawb nqa rau subways / tsev |
Qhov Zoo Tshaj Plaws
| Qhov zoo | Kev piav qhia |
|---|---|
| Optimal Strength - rau - Tus nqi piv | Muab qhov sib npaug zoo tshaj plaws ntawm A252 qib - 17% siab zog dua Qib 1 ntawm tus nqi qis qis [citation: 2, citation: 4] |
| Dav Muaj | Feem ntau stocked qib; yooj yim muaj nyob rau hauv ntau qhov ntau thiab tsawg |
| Weldability zoo | Zoo heev teb weldability rau splice kev twb kev txuas |
| Tsis muaj Hydrostatic Test yuav tsum tau | Txo cov nqi tsim khoom txij li cov kav dej tau ntim nrog pob zeb |
| Galvanizing kev xaiv | Kub-dip galvanized muaj rau kev tiv thaiv corrosion [citation:2, citation:3] |
Kev txiav txim siab tseem ceeb
1. ERW Loj Cov Kev Txwv
ERW manufacturing feem ntau yog siv rau qhov ntau thiab tsawg ntawm NPS 24 (609.6 hli OD) [citation: 3, citation: 10]
Cov kab uas loj dua yuav tsum tau HSAW (kauv) lossis LSAW manufacturing
2. Kev Taw Qhia Qib
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, choj hauv paus, cov nroj tsuag muaj [citation:2, citation:4]
Qib 3: Heavy-load daim ntawv thov, txuas hniav loj, offshore platforms [citation:2, citation:4]
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 kev xa dej.
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
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
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
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% | +51% |
| Daim ntawv thov | Lub teeb loads | General piling | hnyav hnyav |
Cov ntsiab lus
ASTM A252 Qib 2 ERW yeeb nkabyog covstandard, feem ntau siv specificationrau steel yeeb nkab pawg hauv kev tsim kho [citation: 2, citation: 4]. 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 ua [citation:2, citation:4].
Cov yam ntxwv tseem ceeb:
Tsim los ntawm ERW txheej txheem - qhov ntau thiab tsawg mus txog NPS 24 (24 nti OD) [citation: 3, citation: 10]
Tsis muaj kev sim hydrostatic yuav tsum tau - cov kav dej tau ntim nrog cov pob zeb, tsis siv rau kev xa cov kua dej
25% elongation yam tsawg kawg nkaus - muab ductility txaus rau kev teeb tsa
Galvanizing muaj rau kev tiv thaiv corrosion
Cov ntawv thov uas muaj xws li:
Choj foundations thiab pier kev txhawb nqa
High-nce thiab nruab nrab-nce lub hauv paus
Cov qauv hauv hiav txwv (docks, wharves, ports) [citation: 2, citation: 4]
Industrial cog foundations
Temporary shoring thiab khaws cov phab ntsa
Thaum txiav txim, qhia meej: kom muaj nuj nqis, ASTM A252 Qib 2, ERW, sab nraud txoj kab uas hla, phab ntsa tuab, ntev, thiab qhov kawg tiav (dawb lossis beveled) [citation: 3, citation: 5].
