ASTM A252 ERW Yeeb Nkab
Lub ntsiab lus tseem ceeb
ASTM A252, ASTM A252yog tus qauv specification rauwelded thiab seamless steel yeeb nkab pawgsiv hauv kev tsim kho hauv paus [citation:1, citation:3]. Cov txheej txheem no npog cov yeeb nkab uas ua haujlwmruaj khov load- nqa cov tswv cuablos yog raws li lub plhaub rau cam khwb cia-hauv- tso cov pob zeb ua vaj tse [citation:1, citation:8]. ERW (Electric Resistance Welded) yog ib qho kev tso cai tsim khoom rau ASTM A252 kav, nrog rau HSAW, LSAW, thiab seamless [citation: 2, citation: 3, citation: 7].
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: 1, citation: 8] |
| ERW | Electric Resistance Welded - yeeb nkab tsim los ntawm steel kauj thiab welded longitudinally yam tsis muaj muab tub lim hlau |
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:3, citation:7] |
| Kev tsim khoom | ERW, HSAW (kauv), LSAW, thiab seamless [citation: 2, citation: 3, citation: 7] |
| Qib | Qib 1, Qib 2, Qib 3[siv: 2, citation: 3, citation: 8] |
| Qhov Loj Loj (ERW) | NPS 1 txog NPS 24 (33.4 mm txog 609.6 mm OD) |
| Phab ntsa Thickness | 3 hli mus rau 12 hli raug rau ERW; mus txog 50.8 hli rau txoj kev tsim khoom loj |
| Ntev | Min 3 m, Max 18 m, lossis kev cai |
| Kev kho saum npoo | Feem ntau liab qab lossis dub kua roj vanish; Galvanized muaj [Citation: 4, citation: 8] |
Tshuaj muaj pes tsawg leeg
ASTM A252 tsis qhia meej txog kev txwv tshuaj lom neeg muaj pes tsawg leeg, tsuas yog cov khoom siv kho tshuab xwb. Tus qauv tsuas yog teev qhov siab tshaj plaws rau phosphorus thiab sulfur [citation: 2, citation: 8]:
| Element | Kev xav tau |
|---|---|
| Phosphorus (P) | 0.050% max [citation: 2, citation: 4] |
| Sulfur (S) | 0.060% max (tus qauv) |
Lus Cim: Cov neeg tsim khoom tuaj yeem muab cov txiaj ntsig zoo ib yam xws li C Tsawg dua lossis sib npaug rau 0.25%, Mn Tsawg dua lossis sib npaug rau 0.95%, thiab lwm yam, tab sis cov no tsis raug yuam los ntawm tus qauv.
Mechanical Properties
| Qib | Yield zog (min) | Tensile zog (min) | Elongation (min) |
|---|---|---|---|
| Qib 1 | 205 MPa (30,000 psi) [citation: 2, citation: 8] | 345 MPa (50,000 psi) [citation: 2, citation: 8] | Txiav txim siab los ntawm phab ntsa thickness |
| Qib 2 | 240 MPa (35,000 psi) [citation: 2, citation: 8] | 415 MPa (60,000 psi) [citation: 2, citation: 8] | Txiav txim siab los ntawm phab ntsa thickness |
| Qib 3 | 310 MPa (45,000 psi) [citation: 2, citation: 8] | 455 MPa (66,000 psi) [citation: 2, citation: 8] | Txiav txim siab los ntawm phab ntsa thickness |
Dimensional Tolerances
| Parameter | Ua siab ntev |
|---|---|
| Sab nraud txoj kab uas hla | ± 1% ntawm OD [citation: 2, citation: 8] |
| Phab ntsa Thickness | Qhov tsawg kawg nkaus phab ntsa tsis ntau tshaj 12.5% nyob rau hauv nominal [citation: 2, citation: 8] |
| Qhov hnyav | Tsis pub ntau tshaj 15% tshaj lossis 5% nyob rau hauv qhov hnyav theoretical [citation: 2, citation: 8] |
Kev xeem yuav tsum tau
| Hom kev xeem | Kev xav tau |
|---|---|
| Tshuaj ntsuam xyuas | Yuav tsum tau ntsuas kub; cov khoom tsom xam raws li tau teev tseg |
| Tensile Test | Rau ntau; yield thiab tensile zog txheeb xyuas [citation:2, citation:8] |
| Flattening Test | Yuav tsum muaj rau kev txheeb xyuas qhov tseeb ntawm weld |
| Hydrostatic Test | Tsis tau teev tseg- cov kav dej tsis siv rau kev xa cov kua dej; feem ntau sau nrog pob zeb [citation: 2, citation: 8] |
Qib sib piv
| Qib | Yield zog | Tensile zog | Lub zog vs. Qib 1 | Daim ntawv thov |
|---|---|---|---|---|
| Qib 1 | 30,000 psi | 50,000 psi | Lub hauv paus | Lub teeb-load foundations, zoo av tej yam kev mob [citation:3, citation:8] |
| Qib 2 | 35,000 psi | 60,000 psi | +17% | Qib feem ntau - cov ntawv sau npe dav dav [citation:3, citation:8] |
| Qib 3 | 45,000 psi | 66,000 psi | +50% | Hnyav-load daim ntawv thov, txuas hniav, offshore platforms [citation:3, citation:8] |
Daim ntawv thov
| Daim ntawv thov | Kev piav qhia |
|---|---|
| Choj Piling | Lub hauv paus tseem ceeb rau kev tsim choj |
| Dock Kev Tsim Kho | Withstands hnyav loads thiab maritime ib puag ncig pressures |
| High-Rise Building Foundations | Ua kom muaj kev ruaj ntseg zoo rau kev siv sijhawm ntev - |
| Underground Casing | Drilled shafts thiab substructure siv |
| Marine Structures | Wharves, ports, thiab offshore platforms |
Qhov Zoo Tshaj Plaws
| Qhov zoo | Kev piav qhia |
|---|---|
| Siab Durability | Withstands hnyav loads thiab huab ib puag ncig tej yam kev mob |
| Ntau Qib | Tso cai xaiv raws li qhov project load thiab tsim cov cai |
| Ntau yam kev xaiv vuam | Muaj nyob rau hauv ERW, HSAW, LSAW, thiab seamless kom haum rau ntau daim ntawv thov [citation: 3, citation: 7] |
| Tsis muaj Hydrostatic Test yuav tsum tau | Txo cov nqi tsim khoom vim tias cov kav dej tsis siv rau kev xa dej [citation: 2, citation: 8] |
| Galvanizing kev xaiv | Kub-dip galvanized muaj rau corrosion kuj [citation:4, citation:10] |
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 (609.6 hli OD)
Cov kab uas loj dua yuav tsum tau HSAW (kauv) lossis LSAW manufacturing [citation: 2, citation: 7]
2. Kev xaiv qib
Qib 1: Lub teeb lub hauv paus, cov av zoo, cov qauv ib ntus
Qib 2: Qib feem ntau rau kev siv piling
Qib 3: Heavy-load daim ntawv thov, txuas hniav loj, offshore platforms
3. Tsis muaj Hydrostatic Test
Piping kav dej yog ntim nrog pob zeb thiab tsis siv rau kev xa dej
Kev ntsuas hydrostatic tsis tau teev tseg hauv ASTM A252 [citation: 2, citation: 8]
4. Kev kho cua sov
Kev kho cua sov yuav tsum tau nyob ntawm txoj kev tsim khoom thiab qib
ERW cov kav dej yuav xav tau kev kho cua sov hauv vuam kom paub meej cov khoom zoo
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: 4, citation: 10]
Varnish: Kev tiv thaiv ib ntus thaum khaws cia thiab tuav
Cov ntsiab lus
ASTM A252 ERW yeeb nkabyog tus qauv specification rau welded steel yeeb nkab pawg siv nyob rau hauv lub hauv paus tsim. Muaj nyob rau hauv peb qib nrog cov txiaj ntsig muaj zog xws li 30,000 psi (Qib 1) txog 45,000 psi (Qib 3), cov kav dej no ua haujlwm ruaj khov- nqa cov tswv cuab lossis cov plhaub rau cam khwb cia{8}} hauv - tso cov pob zeb hauv:
Choj foundations
Dock thiab marine structures
High-nce tsev hauv paus
Underground casing thiab substructures
ERW kev tsim khoom tsim nyog rau qhov ntau thiab tsawg ntawm NPS 24 (24 nti OD). Tsis zoo li cov qauv yeeb nkab siab, ASTM A252 tsis tas yuav muaj kev sim hydrostatic vim cov kav dej piling tau ntim nrog cov pob zeb ntau dua li siv rau cov dej xa tawm [citation: 2, citation: 8].
Thaum txiav txim, qhia meej: kom muaj nuj nqis, tus qauv (ASTM A252), qib (1, 2, lossis 3), txoj kev tsim khoom (ERW), sab nraud txoj kab uas hla, phab ntsa thickness, ntev, thiab qhov kawg tiav (dawb lossis beveled).
