ASTM A252 Welded & Seamless Carbon Steel Pipe lus piav qhia
Specification
Lub npe: ASTM A252 Standard Specification rau Welded thiab Seamless Steel Pipes
Cov Khoom Tseem Ceeb: Ncaj seam submerged arc welded yeeb nkab (tsis siv tau rau kauv welded yeeb nkab)
Kev siv cov tub ntxhais: Kev tsim khoom ruaj khov-cov kabmob pawg hauv paus (xws li cov pawg hlau lossis cov pob zeb ua pob zeb hauv lub tsev / choj hauv paus)
Core Control Requirements
Qib khoom
GR1 (Foundation Qib): Yield zog Ntau dua lossis sib npaug li 205 MPa, rau cov hauv paus hauv paus ntiav (tsawg dua lossis sib npaug li 20 meters)
GR2 (Mainstream Qib): Cov khoom muaj zog ntau dua lossis sib npaug li 290 MPa, haum rau pawg qhov tob Tsawg dua lossis sib npaug li 40 meters (sau suav txog 60% + ntawm kev siv thoob ntiaj teb)
GR3 (High Strength Grade): Yield strength ≥ 345 MPa MPa, for super high-rise/cross-sea projects (>40m qhov tob)
Yam yuav tsum tau ua
Hydraulic Pressure Test: Ntau dua los yog sib npaug rau 5MPa siab tuav rau 5 vib nas this, tsis muaj dej xau (xyuas sealing)
Flattening Test: Thaum compressed rau 1/3 ntawm cov yeeb nkab txoj kab uas hla, tsis muaj weld tawg (qhov tseem ceeb tsis ua hauj lwm pib)
Bending Test: Tom qab 180℃txias dabtsi yog khoov, tsis muaj weld tawg ntau dua los yog sib npaug rau 3 hli (simulates kev tsim kho kev nyuaj siab)
Tensile Test: 2 cov qauv rau ib lub cub tawg, lub zog yuav tsum tau raws li qib sib xws (piv txwv li, GR2 tensile zog Ntau dua lossis sib npaug ntawm 415 MPa)
Dimensional Tolerances
Outer diameter error ≤±0.75%, wall thickness negative deviation >10% raug tsis lees paub. Kev Ncaj Ncees Tsawg dua lossis sib npaug li 3mm / 3m (tiv thaiv pawg tilting)
Mechanical Properties
Chemical Structure ntawm A252 Steel Piling Pipe
Elongation tus nqi ntawm A252 seamless Erw Pipes
Cov qauv siv rau kev ua ASTM A252 PIPE
ASTM A370 cov txheej txheem tshuaj xyuas thiab cov ntsiab lus rau kev kuaj xyuas cov khoom siv hlau.
ASTM A751: Tshuaj ntsuam xyuas txoj hauv kev.
ASTM A941 Cov ntsiab lus rau carbon, alloy thiab stainless hlau.
E29 xyaum siv cov lej tseem ceeb hauv kev xeem ntsuas los txiav txim siab ua raws li kev qhia tshwj xeeb.
ASTM A252 Txuj Kev Tshawb Fawb Cov Khoom & Cov Lus Qhia
| Pawg tshuaj ntsuam xyuas | Cov khoom kuaj | Txuj Kev Cai | Engineering tseem ceeb |
|---|---|---|---|
| Hydrostatic Test | Kuaj Siab | Ntau dua lossis sib npaug rau 5 MPa tuav rau Ntau dua lossis sib npaug li 5 vib nas this | Kev ruaj ntseg sealing |
| Kev lees txais | Tsis muaj dej xau / mus tas li deformation | ||
| Flattening Test | Compression Qib | Compressed kom txog thaumnrug ntawm daim hlau=1/3 × nominal yeeb nkab txoj kab uas hla | Weld toughness & bonding zog tshuaj xyuas |
| Kev lees txais | Tsis muaj cracking nyob rau hauv weld cheeb tsam (Kev tsis lees paub tam sim yog ua tsis tau) |
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| Khoov Test | Khoov lub kaum sab xis | 180℃txias khoov (Mandrel txoj kab uas hla=0.75 × yeeb nkab txoj kab uas hla) |
Simulates kev tsim kho kev nyuaj siab |
| Kev lees txais | Tsis muaj kab nrib pleb Ntau dua lossis sib npaug li 3 hli hauv weld | ||
| Tensile Test | Qauv Quantity | 2 cov qauv rau ib lub tshav kub | Material zog validation |
| Yield zog | GR1 Ntau dua lossis sib npaug rau 205 MPa, GR2 Ntau dua lossis sib npaug rau 290 MPa, GR3 Ntau dua lossis sib npaug rau 345 MPa | ||
| Tensile zog | GR1 Ntau dua lossis sib npaug rau 345 MPa, GR2 Ntau dua lossis sib npaug rau 415 MPa, GR3 Ntau dua lossis sib npaug rau 485 MPa | ||
| Dimensional kam rau ua | Sab nraud Diameter (OD) | ±0.75% | Xyuas kom cov pawg - av sib cuam tshuam raug |
| Phab ntsa Thickness (WT) | ±10% (Tsis lees paub yog WT - < 90% nominal) |
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| Kev ncaj | Tsawg dua los yog sib npaug li 3 hli rau 3m ntev | Qhov tseem ceeb rau pawg tsav tsheb verticality |
Ntim thiab shipping
