A252 GR3 yog siab -kev ua tau zoo ntawm cov qauv hlau dav siv hauv kev tsim kho, txuas hniav, thiab tshuab tsim khoom vim nws cov khoom siv zoo heev thiab cov tshuaj muaj pes tsawg leeg.
Tshuaj muaj pes tsawg leeg:
A252 txais kev tsim qauv qis carbon sib npaug (Ceq Tsawg dua lossis sib npaug rau 0.44%), nrog rau cov khoom tseem ceeb hauv qab no:
- C: 0.18% Max
- Si: 0.50% Max
- Mn: 1.50% Max
- P/S: Tsawg dua lossis sib npaug rau 0.035%
- Cov lej ntawm cov ntsiab lus alloying xws li Nb, V, thiab Ti tau ntxiv los txhim kho kev ua tau zoo tag nrho los ntawm kev ua kom zoo dua cov nplej thiab nag lossis daus.
- Kev tshuaj xyuas tshuaj muaj pes tsawg leeg yog qhov tseem ceeb rau ASTM A252 steel yeeb nkab pawg thiab yuav tsum tau ua raws li cov txheej txheem xeem, cov txheej txheem, thiab cov ntsiab lus ntawm ASTM A751.
- Cov ntsiab lus phosphorus hauv cov hlau yuav tsum tsis pub tshaj 0.050% los xyuas kom meej qhov zoo thiab kev ua haujlwm ntawm cov hlau. Cov neeg yuav khoom tuaj yeem xaiv ob qho qauv ntawm txhua pawg ntawm cov yeeb nkab rau kev tshuaj xyuas cov khoom kom ntseeg tau tias cov tshuaj muaj pes tsawg leeg ua tau raws li qhov xav tau.
Mechanical zog
A252 GR3 structural steel kav muaj qhov sib npaug ntawm lub zog siab thiab zoo ductility thiab toughness, nrog ib tug raug yield zog Ntau tshaj los yog sib npaug rau 345MPa, tensile zog 470-630MPa, thiab elongation Ntau tshaj los yog sib npaug rau 20%. Lawv muaj qhov zoo ntawm qhov kub thiab txias tsis zoo rau qhov hnyav (kev cuam tshuam lub zog Ntau dua lossis sib npaug ntawm 34J ntawm -20 degree), ua rau lawv tsim nyog siv rau thaj chaw txias heev. Cov khoom tau dhau los ntawm kev tswj cov dov thiab txias txheej txheem (TMCP), uas ua rau cov nplej ua kom zoo thiab zoo heev weldability thiab qaug zog.
Daim ntawv thov ntawm A252 GR3 Steel Pipes:
1. Cov Khoom Siv Hauv Tsev: Cov ncej steel rau siab - cov tsev nce siab, cov khoom siv seismic bracing
2. Choj Engineering: Lub thawv girders rau ntev - txuas txuas, thauj khoom -cov khoom siv rau cov piers choj
3. Siv Machinery: Crane booms, hnav-cov khoom tiv thaiv rau cov khoom siv mining
4. Cov Tsheb Tshwj Xeeb: Hnyav - lub luag haujlwm tsheb chassis, thawv thav ntawv