American StandardASTM A252, ASTM A252yog cov specification rau welded thiab seamless steel yeeb piles, dav siv nyob rau hauv kev tsim kho thiab structural tej yaam num. Tus qauv suav nrog peb qib (1, 2, 3), nrog Qib 3 yog qhov feem ntau siv rau kev siv piling vim nws lub zog zoo dua.
Txhais
ASTM A252 npog cylindrical steel kav nrog nominal phab ntsa tuab, tsis suav nrog cov kav dej.
Cov kav dej no ua haujlwm ruaj khov- cov tswv cuab lossis cov plhaub rau cam khwb cia- hauv - tso cov pob zeb ua vaj tse.
Cov chav nyob hauv nti - phaus, tab sis tuaj yeem hloov mus rau SI units rau engineering.
Tshuaj muaj pes tsawg leeg
Phosphorus (P) max: 0.050% (cov qib siab dua txo cov weldability thiab nce brittleness).
Lwm cov ntsiab lus ua raws li cov pa roj carbon steel muaj pes tsawg leeg.
Mechanical Properties
| Qib | Yield zog | Tensile zog | Elongation |
|---|---|---|---|
| 1 | 205 MPa (30,000 psi) | 345 MPa (50,000 psi) | Phab ntsa-nyob |
| 2 | 240 MPa (35,000 psi) | 415 MPa (60,000 psi) | Phab ntsa-nyob |
| 3 | 310 MPa (45,000 psi) | 455 MPa (66,000 psi) | Phab ntsa-nyob |
Qib 3 yog qhov kev xaiv zoo tshaj plaws rau hnyav- lub luag haujlwm piling vim nws lub zog tensile thiab yield zog.
Cov qauv siv
ASTM A370: Mechanical xeem txoj kev.
ASTM A751: Tshuaj ntsuam xyuas txoj kev.
ASTM A941: Cov lus qhia rau cov hlau.
ASTM E29: Siv cov lej tseem ceeb rau kev xeem ua raws.
Hom kev tsim khoom
Seamless Yeeb Nkab Piles
Kub dov los yog txias kos, thermally nthuav seamless steel kav.
Welded Yeeb Nkab Piles
ERW (Electric Resistance Welded), flash welded, fusion welded, lossis submerged arc welded (SSAW lossis LSAW).
Seams tuaj yeem yog longitudinal lossis helical kauv.
Raw Material Production
Ua los ntawm kev qhib -hearth, cov pa oxygen, lossis cov txheej txheem hluav taws xob.
Ua ntej- Cov ntaub ntawv yuav khoom
Ua ntej xaj ASTM A252 yeeb nkab pawg, cov hauv qab no yuav tsum tau teev tseg:
Quantity (ko taw, meters, los yog tus naj npawb ntawm qhov ntev)
Cov ntaub ntawv qib (1, 2, lossis 3)
Hom kev tsim khoom (seamless lossis welded; ERW, EFW, LSAW, SSAW)
Cov yeeb nkab loj (OD thiab nominal phab ntsa thickness; ASME B36.10 lub sijhawm)
Length (SRL, DRL, tsau / customized)
Hom kawg (dawb lossis beveled)
Kev soj ntsuam thiab kev xa khoom xav tau
Qhov Kev Pab Cuam Tsis Zoo
Surface imperfections >25% ntawm phab ntsa thickness=tsis xws luag.
Kev tsis zoo tsawg dua lossis sib npaug li 22.5% tuaj yeem txuas tau- kho.
Cov teeb meem yuav tsum tau muab tshem tawm ua ntej lub pob tw welding.
Kev xeem yuav tsum tau
Kev txheeb xyuas cov khoom
Thaum tshav kub kub tsom xam: Phosphorus txwv, tshaj tawm hauv MTC.
Kev tsom xam cov khoom: Cov qauv zaus nyob ntawm cov yeeb nkab txoj kab uas hla.
Tensile Test
Yuav tsum ua tau raws qib -cov txiaj ntsig tshwj xeeb thiab lub zog tensile.
Yog tias qhov taw tes tawm los tsis meej, sim 0.2% offset tawm los lossis 0.5% tag nrho txuas ntxiv.
Nyhav & Dimension Tolerances
Qhov hnyav: +15% / -5% ntawm txoj kev xav
OD: ± 1%
Phab ntsa thickness: ± 12%
Ntev: SRL, DRL, lossis customized
Nco tseg: Kev sim hydrostatic tsis tas yuav tsum tau ua txij li ASTM A252 cov kav dej feem ntau yog siv rau hauv cov kav dej, tsis yog kua thauj.
Cov khoom siv
ASTM A252 yeeb nkab piles yog dav siv nyob rau hauv kev tsim kho tej yaam num vim lawv lub zog thiab durability. Cov ntawv thov ib txwm muaj xws li:
| Daim ntawv thov | Hom Pipe Loj (OD x W / T) | Yuav tsum muaj zog | Sau ntawv |
|---|---|---|---|
| Tsev & High -Rise Structures | 12 "- 36" OD, 0.109 "- 0.312" W / T | Qib 3: 66,000 psi tensile, 45,000 psi tawm los | Muaj peev xwm txhawb nqa ntau- zaj dab neeg lub hauv paus |
| Kev tuav phab ntsa | 10 "- 24" OD, 0.109 "- 0.250" W / T | Qib 2 lossis 3 | Muab kev txhawb nqa sab nraud thiab tuav lub ntiaj teb |
| Choj, Docks & Offshore Platforms | 14 "- 36" OD, 0.156 "- 0.312" W / T | Qib 3 nyiam | Corrosion-cov tshuaj tiv thaiv tau pom zoo rau kev raug dej hiav txwv |
| Industrial & Municipal Infrastructure | 8 "- 24" OD, 0.109 "- 0.250" W / T | Qib 1 - 3 nyob ntawm kev thauj khoom | Xws li cov kav dej, cov hauv paus, thiab cov twj tso kua mis |
Qhov zoo nrog cov ntaub ntawv txhawb nqa
| Qhov zoo | Paub meej / Cov ntaub ntawv |
|---|---|
| Siab zog rau Load-Bearing | Qib 3 tensile zog: 455 MPa (66,000 psi), yield zog: 310 MPa (45,000 psi) |
| Weldable rau Custom Lengths | Seamless los yog welded (ERW, SSAW, LSAW); Ntev: SRL 16-25 ft, DRL avg 35 ft, max 100 ft rau cov haujlwm tshwj xeeb |
| Ntau yam Manufacturing | Seamless, ERW, SSAW, LSAW; diameters ntawm 6 "mus rau 100" + thiab phab ntsa thickness ntawm 0.109 "mus rau 0.312" |
| Corrosion Resistance | tuaj yeem coated nrog FBE / 2FBE, 2LPE / 3LPE, 2LPP / 3LPP; marine- qib coatings txuas lub neej kev pab ntau tshaj 50 xyoo |
