ASTM A252 Qib 3yog qib kev ua tau zoo tshaj plaws ntawm peb qib A252 steel yeeb nkab, dav siv rau hnyav-load qauv thiab tej yaam num nyob rau hauv complex geological tej yam kev mob. Cov ntawv thov feem ntau suav nrog cov tsev lag luam loj, cov txuas hniav loj, cov chaw tawm sab nrauv, thiab lwm yam kev xav tau kev tsim kho.
ASTM A252 Qib Txheej txheem cej luam
| Qib | Tensile zog | Yield zog | Elongation (2 nti) |
|---|---|---|---|
| Qib 1 | 345 MPa (50,000 psi) | 205 MPa (30,000 psi) | 30% |
| Qib 2 | 415 MPa (60,000 psi) | 240 MPa (35,000 psi) | 25% |
| Qib 3 | 455 MPa (66,000 psi) | 310 MPa (45,000 psi) | 20% |
Kev xav tau tshuaj: Phosphorus Tsawg dua lossis sib npaug rau 0.050% rau txhua qib
Kev ua tau zoo: Qib qib siab dua=kev ua haujlwm siab dua
Manufacturing & Material Process
Raw Material Production: Qhib-hearth, yooj yim-oxygen, lossis hluav taws xob rauv hlau
Hom yeeb nkab: Seamless, LSAW, SSAW, EFW, ERW, los yog lwm yam welded kav
Seam Orientation: Longitudinal, helical - taub qab, los yog helical -lap
Mechanical Properties - ASTM A252 Qib 3
| Khoom | Tus nqi |
|---|---|
| Tensile zog | 66,000 psi (455 MPa) min |
| Yield zog | 45,000 psi (310 MPa) min |
| Elongation (Ntau dua lossis sib npaug rau 5/16 hauv phab ntsa) | 20% |
| Elongation (<5/16 in. wall) | Txiav tawm 1.0% rau 1/32 hauv phab ntsa txo |
Nominal Phab Ntsa Thickness vs Elongation:
| Phab ntsa Thickness | Elongation (2 nti) |
|---|---|
| 5/16 nyob rau hauv (7.9mm) | 20% |
| 9/32 nyob rau hauv (7.1mm) | 19% |
| 1/4 nyob rau hauv (6.4mm) | 18% |
| 7/32 nyob rau hauv (5.6 mm) | 17% |
| 3/16 nyob rau hauv (4.8mm) | 16% |
| 11/64 nyob rau hauv (4.4mm) | 15.5% |
| 5/32 nyob rau hauv (4.0mm) | 15% |
| 9/64 nyob rau hauv (3.6 mm) | 14.5% |
| 1/8 nyob rau hauv (3.2mm) | 14% |
| 7/64 nyob rau hauv (2.8 mm) | 13.5% |
Elongation formula (intermediate thicknesses):
E=32t+10orE=1.25t+10E=32t + 10 \\quad \\text{or} \\quad E=1.25t + 10E=32t+10orE=1.25t+10
Qhov twg E=elongation (%) thiab t=phab ntsa thickness (hauv mm).
Yeeb Nkab Xaus & Zoo
Pipe Ends: Plain- xaus; bevel kaum sab xis 30℃-35℃yog tias xav tau
Txiav: Nplaim- txiav lossis tshuab- txiav, burrs tshem tawm
Nto Zoo:
Deg defects Tsawg dua los yog sib npaug rau 12.5% phab ntsa thickness tau txais
Tsis zoo 12.5-33% phab ntsa tuab tuaj yeem kho los ntawm vuam
Straightness: Cov kav dej yuav tsum ncaj ncaj thiab tsis muaj qhov tsis xws luag cuam tshuam rau kev siv tau
Qhov ntev
Seamless Piles: Ø 13.7 mm - 1200 mm
Welded Piles: Ø 21.3 hli - 3500 hli
Lwm yam yuav tsum tau muaj: Dimensional tolerances thiab yeeb nkab luj rooj ua raws li ASTM A252 specifications
ASTM A252 Qib 2 vs Qib 3
| Feature | Qib 2 | Qib 3 |
|---|---|---|
| Cov ntsiab lus phosphorus | Tsawg dua lossis sib npaug li 0.050% | Tsawg dua lossis sib npaug li 0.050% |
| Tensile zog | 415 MPa rau | 455 MPa rau |
| Yield zog | 240 MPa | 310 MPa |
| Elongation (2 nti) | 25% | 20% |
Qib 3 steel kav yog xaiv rau siab -load, complex, thiab tseem ceeb engineering tej yam kev mob. Lwm cov ntaub ntawv xws li API 5L X52, ASTM A500 Qib C, EN 10210 S355J2H, AS 1163 C350, JIS G 3444 STK 490 kuj tseem siv tau nyob ntawm qhov yuav tsum tau ua.
