1. Cov lus txhais thiab cov ntawv siv tseem ceeb
ASTM A252, ASTM A252: Ib qho qauv rau pawg hauv paus steel kav, qhia txog kev tsim cov welded / seamless yeeb nkab pawg. Nws yog feem ntau siv rau hauv daim ntawv thov uas yuav tsum tau axial cuam tshuam load kuj thiab av lateral siab tsis kam, xws li chaw nres nkoj foundation pawg thiab lub hauv paus kev txhawb nqa systems. Cov qauv no tshwj xeeb tshaj yog hais txog cov yeeb nkab txoj kev khoov kev ua tau zoo (nrog rau qhov yuav tsum tau ua kom muaj kev ncaj ncees tsawg dua lossis sib npaug li 0.25% ntawm qhov ntev) thiab qhov tseeb qhov tseeb.
A36 hlau: Cov qauv steel qauv dav dav, categorized li qis- carbon steel, dav siv hauv cov qauv tsim, choj qauv, thiab kev siv tshuab tsim khoom. Nws cov txiaj ntsig tseem ceeb yog nyob rau hauv weldability zoo heev thiab ua haujlwm tau zoo.
2. Qhov tseem ceeb Performance Parameter piv
| Parameter | ASTM A252 (Gr.3) Txoj Cai | A36 hlau |
|---|---|---|
| Yield zog | Ntau dua lossis sib npaug li 241 MPa | Ntau dua lossis sib npaug li 250 MPa |
| Tensile zog | Ntau dua lossis sib npaug li 455 MPa | 400-550 MPa |
| Elongation | Ntau dua lossis sib npaug li 20% | Ntau dua lossis sib npaug li 20% |
| Cov ntsiab lus tseem ceeb | Bending kev ua tau zoo, straightness kam rau ua | Weldability, txias formability |
| Hom Specifications | Φ300-2000mm, phab ntsa thickness 6-25mm | Phaj / Profile, thickness 3-200mm |
3. Cov yam ntxwv ntawm cov khoom
A252 Pile Pipe:
Yuav tsum tiv thaiv pawg tsav tsheb cuam tshuam (Ntau dua lossis sib npaug rau 3-tuj rauj zog)
Yuav tsum tau corrosion-cov tshuaj tiv thaiv (pom zoo kub-dip galvanizing)
Tsim los ntawm kauv / seam welding nrog 100% weld soj ntsuam
A36 Cov Qauv Hlau:
Tsawg-carbon muaj pes tsawg leeg (C Tsawg dua los yog sib npaug rau 0.25%) nrog weldability zoo heev
Ua los ntawm cov txheej txheem kub / txias dov nrog qhov siab saum npoo tiav
Zoo ntuj huab cua tiv thaiv yam tsis muaj kev kho tshwj xeeb
4. Daim ntawv thov Scenarios
A252 Daim Ntawv Thov Yuav Tsum Tau:
Chaw nres nkoj foundation engineering (corrosive marine ib puag ncig)
Seismic zone tsev foundations (shear deformation kuj)
Sib sib zog nqus excavation yug (nrog av siab)
A36 Cov ntawv thov nyiam:
Steel tsev moj khaum (modular sib dhos)
Mechanical khoom txhawb nqa (seem precision)
Choj tsis yog - cov khoom tseem ceeb ntawm cov qauv
A252 welded thiab seamless steel piling kav Hoobkas
