ASTM A252 Qib 1 Kauv Submerged Arc Welded (SSAW) Piling Piping: Cov Txheej Txheem Txheej Txheem
Cov specification no txhais tau tias asteel yeeb nkab, tsim los ntawm cov kauv submerged arc vuam txheej txheem, tshwj xeeb tsim raulub hauv paus thiab kev txhawb nqaes tsis yog dej thauj.
1. Specification Breakdown
ASTM A252 Cov Lus Qhia:Txoj cai tswj hwm lub npe "Standard Specification rau Welded thiab Seamless Steel Pipes". Qhov no qhia meej meej nws qhov kev siv thawj zaugpawg.
Qib 1:Covqib khoom sivRaws li ASTM A252. Muaj peb qib (1, 2, 3), nrogQib 1 yog qhov ntau tshaj plaws thiab muaj lub zog qis tshaj qhov qis tshaj tawm. Nws muaj tus nqi -kev daws teeb meem zoo rau ntau daim ntawv thov txheej txheem.
Spiral Submerged Arc Vuam (SSAW/HSAW):Covkev tsim khoomzoo tagnrho rau kev tsim cov loj diameters xav tau rau piling.
2. Lub hom phiaj tseem ceeb & Cov yam ntxwv tseem ceeb
Lub luag haujlwm tseem ceeb:Txhawm rau hloov cov khoom thauj khoom los ntawm cov tsev, txuas hniav, lossis cov qauv hauv hiav txwv los ntawm cov txheej txheem av tsis muaj zog kom muaj zog, sib sib zog nqus strata. Nws yog tsim los tiv tausaxial compression, dabtsi yog khoov lub sijhawm, thiab lub zog cuam tshuam thaum tsav tsheb.
Qhov sib txawv ntawm Cov Yeeb Nkab Siab (xws li ASTM A53):
Tsis yog rau Kev Tiv Thaiv Kev Nyuaj Siab:Nws lub hom phiaj tsim yogstructural zog thiab ductility, tsis siab - siab ua haujlwm siab.
Qhov tseem ceeb ntawm Weldability thiab Toughness:Cov kav dej feem ntau koom nrog hauv daim teb los ntawm tag nrho - lub voj voog lub taub qab vuam, thiab cov vuam yuav tsum tiv taus kev tsav tsheb hnyav yam tsis muaj kev tawg.
Sib txawv Test Philosophy:Kev kuaj hydrostatic tsis yog yuav tsum tau, tab siskhoov kuaj ntawm qhov vuamyog qhov tseem ceeb.
3. Technical Specifications & Comparative Table
Cov lus hauv qab no qhia cov ntsiab lus tseem ceeb rau ASTM A252 Qib 1 SSAW yeeb nkab thiab sib piv nrog cov paub ASTM A53 Qib B siab yeeb nkab los qhia txog lawv cov kev xav sib txawv.
Table: Technical Specifications of ASTM A252 Gr.1 SSAW Piling Pipe vs ASTM A53 Gr.B Siab Yeeb Nkab
| Qeb Parameter | ASTM A252 Qib 1 (SSAW Piling Pipe) | ASTM A53 Qib B (SSAW Siab / Mechanical Pipe - Siv) | Qhov tseem ceeb & cuam tshuam |
|---|---|---|---|
| Lub Hom Phiaj Tsim Tseem Ceeb | Kev them nyiaj yug tus qauv / Foundation Piling(Compression, Load-Cov kabmob) | Pressure Fluid Conveyance/ Mechanical Applications | Lub hom phiaj tseem ceeb dictates tag nrho cov kev xav tau ntawm kev ua haujlwm. |
| Yield zog, min | 206 MPa (30,000 psi) | 241 MPa (35,000 psi) | qis rau qib 1.Txaus rau ntau yam av; nyiam weldability thiab nqi. Cov qib siab (Gr.2: 290 MPa, Gr.3: 345 MPa) muaj. |
| Tensile zog, min | 310 MPa (45,000 psi) | 414 MPa (60,000 psi) | Tsawg heev.Piles feem ntau tiv thaiv kev ntxhov siab, tsis yog sab hauv. |
| Tshuaj muaj pes tsawg leeg | Tsis tau teev los ntawm tus qauv.Tsuas yog cov cuab yeej siv tshuab tau raug yuam. Cov neeg tsim khoom muaj kev yooj yim. | Tshwj xeeb txwv(C Tsawg dua lossis sib npaug li 0.30%, Mn Tsawg dua lossis sib npaug li 1.20%, thiab lwm yam). | Muab cov chaw tsim cov yeeb nkab ua kom yooj yim siv tus nqi - steel zoo kom ua tau raws li cov hom phiaj siv tshuab. |
| Elongation (min) | 14%(hauv 2-hauv. gauge length, longitudinal specimen) | Nws txawv nrog phab ntsa thickness, feem ntauNtau dua lossis sib npaug li 20%. | Kev xav tau qis duatab sis xyuas kom txaus ductility los tiv thaiv kev tsav tsheb cuam tshuam thiab khoov yam tsis muaj pob txha tawg. |
| Kev tsim khoom | Spiral Submerged Arc Vuam (SSAW/HSAW) | Spiral Submerged Arc Vuam (SSAW/HSAW) | Tib txheej txheem, tab sis piling yeeb nkab weld yog qhov ntsuas ntsuas rautoughness thiab tsis kam mus tearing. |
| Hom Loj Loj | OD:Feem ntau ntawm 12 "mus txog 100" +. WT:Feem ntau 6mm txog 25mm +, tuaj yeem ua tuab dua. |
OD:Feem ntau ntawm 20" mus txog 100"+. WT:Feem ntau 6mm txog 25mm +. |
Ob leeg ua tau zoo ntawm cov kab loj loj. Piping yeeb nkab yuav xav tau cov phab ntsa hnyav dua rau kev tsav tsheb hnyav. |
| Hydrostatic Test | xaiv tau.Tej zaum yuav ua tau raws li qhov kev pom zoo ntawm tus neeg yuav khoom thiab cov chaw tsim khoom. | Yuav tsum tau.Yuav tsum tau nyob rau txhua qhov ntev ntawm ib tus qauv qhia. | Qhov txawv tseem ceeb.Lub siab ncaj ncees tsis yog lub luag haujlwm tseem ceeb ntawm pawg. |
| Tsis yog -Kev Ntsuas Kev Puas Tsuaj (NDT) | Yuav tsum tau rau weld seam(Ultrasonic lossis Radiographic). | Yuav tsum tau rau weld seam. | Ua kom muaj kev ncaj ncees ntawm cov weld, tab sis cov qauv kev lees paub yuav tsom mus rau qhov tsis xws luag cuam tshuam rau lub zog ntawm cov qauv. |
| Khoov Test | Yuav tsum tau.Lub transverse weld specimen yuav tsum tau khoov yam tsis muaj kev tawg mus rau lub kaum sab xis. | Tsis tas yuav tsum tau tshwj tsis yog Kev Xav Tau NtxivS5yog teev. | Key Test rau Piles.Ncaj nraim soj ntsuam cov weld lub ductility thiab soundness nyob rau hauv bending stresses akin rau cov thaum lub sij hawm installation. |
| Xaus Xaus | Feem ntauPlain End (PE)rau teb pob tw -welding. | Plain End (PE) lossis Beveled End (BE). | Cov seem feem ntau yog welded ua ke ntawm - qhov chaw los ua cov kab ntev, tsis tu ncua. |
4. Kev txiav txim siab tseem ceeb rau kev xaiv & siv
Qib Xaiv:XaivQib 1rau cov ntawv thov txheem. Rau siab dua load peev los yog nyuaj tsav tsheb, qhiaQib 2los yogQib 3.
Kev tiv thaiv corrosion:Rau cov pawg mus tas li raug rau cov av lossis dej, cov txheej txheem sab nraud (piv txwv li, Fusion-Bonded Epoxy, Coal Tar Epoxy) thiab/los yogcathodic tiv thaiv systemsyuav luag ib txwm tsim nyog.
Kev txiav txim siab tsav tsheb:Cov yeeb nkab kawg yuav haum nrog atsav khau(ib welded steel taub) kom tiv thaiv kev puas tsuaj thaum tsav tsheb. Lub cevphab ntsa thicknessyuav tsum tau xaiv los tiv thaiv qhov kev cia siab ntawm kev tsav tsheb.
Cov Lus Qhia Ntxiv:ASTM A252 suav nrog cov kev xav tau ntxiv (xws liS1rau Charpy Impact Tests) uas tuaj yeem teev tseg rau cov haujlwm hauv huab cua txias lossis nrog cov khoom hnyav hnyav.
** Hauv cov ntsiab lus, ASTM A252 Qib 1 Spiral Submerged Arc Welded Pipe yog tus nqi - siv tau, loj - txoj kab uas hla cov qauv tsim tsim tshwj xeeb rau kev txhawb nqa hauv paus. Nws cov specifications tseem ceeb tshaj qhov weldability, ductility, thiab cov qauv kev ncaj ncees nyob rau hauv compressive thiab cuam tshuam loads, teem nws sib nrug los ntawm cov kav dej tsim los rau lub siab ntim.
