1. Q: ASTM A252 yog dab tsi?
A:ASTM A252 yog tus qauv kev qhia tawm los ntawm ASTM International uas npog cov welded thiab seamless steel yeeb nkab. Cov kav dej no tau tsim los siv los ua cov txheej txheem kev txhawb nqa lossis ua lub hauv paus (piles) hauv kev tsim kho thiab kev tsim vaj tsev engineering.
2. Q: Dab tsi yog cov ntawv thov tseem ceeb ntawm ASTM A252 yeeb nkab?
A:Thawj daim ntawv thov yog raufoundation piling. Lawv raug tsav mus rau hauv av los txhawb cov vaj tse, txuas hniav, tuav cov phab ntsa, thiab lwm yam khoom hnyav los ntawm kev xa cov load mus rau qhov tob, ruaj khov av lossis pob zeb txheej.
3. Q: Cov qib sib txawv hauv ASTM A252 yog dab tsi thiab lawv txhais li cas?
A:ASTM A252 qhia peb qib raws li qhov tsawg kawg nkaus yield zog:
Qib 1:Yam tsawg kawg nkaus lub zog ntawm 30,000 psi (205 MPa).
Qib 2:Yam tsawg kawg nkaus lub zog ntawm 35,000 psi (240 MPa).
Qib 3:Yam tsawg kawg nkaus lub zog ntawm 45,000 psi (310 MPa).
Qib siab dua qhia tau tias muaj zog dua, hnyav dua -cov yeeb nkab.
4. Q: Puas yog ASTM A252 yeeb nkab welded lossis seamless?
A:Tus qauv npog ob qho tib siweldedthiabseamlesscov txheej txheem tsim khoom. Txawm li cas los xij, hom feem ntau siv rau piling yog welded yeeb nkab (feem ntau Electric Resistance Welded - ERW).
5. Q: Dab tsi yog qhov kev xeem yuav tsum tau ua rau ASTM A252 yeeb nkab?
A:Tus qauv xav tau:
Flattening Test:Lub nplhaib qauv yog flattened mus rau ib qho kev ncua deb los ua pov thawj ductility thiab soundness yam tsis muaj cracking.
Khoov Test:Rau cov kav dej welded, ib pluaj yog khoov los ua kom pom qhov zoo ntawm cov vuam thiab lub hauv paus hlau.
Tshuaj ntsuam xyuas:Txhawm rau txheeb xyuas cov hlau muaj pes tsawg leeg.
Tensile Test:Txhawm rau paub meej tias lub zog tawm los, lub zog tensile, thiab elongation ua tau raws li qib kawm.
