### 1. Dab tsi yog qhov txawv ntawm Astm A252 Qib 2 thiab qib 3?
Qhov sib txawv ntawm Astm ASTM A252 qib 2 thiab qib 3 yog lawv tsawg kawg yog lub zog muaj zog thiab lub zog tensile. Qib 3 muaj zog dua yuav tsum muaj dua qib 2.
* ** Qib 2 ** muaj tsawg kawg lub zog muaj zog ntawm 35,000 psi (250 MPA) thiab lub zog yam tsawg kawg ntawm 60,000 psi (415 MPA).
* ** QIB 3 ** muaj tsawg kawg nkaus zog lub zog ntawm 45,000 psi (310 MPa) thiab qhov tsawg kawg tensile lub zog ntawm 66,000 PSI (455 MPA).
Qhov no txhais tau hais tias qib 3 tuaj yeem tiv thaiv ntau dua cov haujlwm sib sib zog ua ntej qhov kev tsim nyog yuav tsum tau ua kom muaj zog thiab tsav tsheb nyuaj. Cov tshuaj lom neeg muaj pes tsawg leeg feem ntau zoo sib xws, nrog lub zog ua tiav los ntawm cov hlau - ua cov txheej txheem.
### 2. Dab tsi yog A252 Qib 3 Cov Khoom Hlau Steel?
ASTM A252 Qib 3 Hlau yog ib tug carbon steel specification rau welded thiab seamless steel yeeb nkab piles. Nws cov khoom tseem ceeb yog txhais raws li hauv qab no:
* ** PAUB Lub Zog: ** Qhov tsawg kawg nkaus tau los lub zog yog 45,000 phaus ib square nti (PSGI) lossis 310 megapScals (MPA). Qhov no yog kev ntxhov siab uas cov khoom pib ua kom deform plastically.
* ** Lub zog tensile: ** lub zog tsawg tshaj plaws yog 66,000 PSI lossis 455 MPA. Qhov no yog qhov kev ntxhov siab tshaj plaws siab tshaj plaws cov khoom tuaj yeem tiv thaiv thaum tab tom ncab lossis rub tawm ua ntej tawg.
* ** ELONGATION: ** Qhov tsawg kawg nkaus elongation yog 15% ntawm 2-nti gauge ntev. Qhov kev ntsuas no cov qauv ntawm cov hlau, qhia tau tias nws tuaj yeem ncab ua ntej pob txha lov.
Tus qauv tsis qhia meej cov khoom siv tshuaj kom ntxaws, raws li kev tsom xam yog nyob rau ua tiav cov khoom siv neeg kho mob no. Nws yog ib qho ntau yam thiab cov khoom siv muaj zog tsim tshwj xeeb rau kev siv ua lub hauv paus piling hauv kev tsim kho.
### 3. Dab tsi yog cov txiaj ntsig ntawm Astm A252 Qib 2?
Qhov tsawg kawg nkaus tau lees lub zog rau astm ASTM A252 Qib 2 Steel Yeeb yog ** 35,000 phaus ib square inch (psi) **. Hauv cov koog metric, qhov no yog ** 250 megapors (MPA) **. Qhov no yog qib kev ntxhov siab ntawm cov khoom uas cov khoom yuav pib rau kev deformation tas mus li.
### 4. Dab tsi yog qhov txawv ntawm A53 thiab A252 qib 3?
ASTM A53 thiab ASTM A252 Qib 3 yog tsim los rau cov ntawv thov sib txawv tag nrho, uas yog qhov tseem ceeb ntawm lawv qhov sib txawv.
* ** ASTM A252 Qib 3 ** yog tus qauv rau ** steel yeeb nkab piles **. Nws lub hom phiaj tseem ceeb yog kom raug tsav mus rau hauv av los muab txoj kev txhawb nqa hauv lub tsev zoo li vaj tse xws li vaj tse thiab txuas hniav. Qhov tseem ceeb yog nyob rau ntawm cov kws kho tshuab (tawm los thiab lub zog tensile) kom tiv thaiv kev tsav tsheb thiab cov khoom tsim. Nws ib txwm tsis siv rau kev thauj cov kua dej.
* ** ASTM A53 ** yog tus qauv rau ** General hom phiaj steel yeeb nkab **. Nws yog npaj rau kev siv tshuab thiab kev siv siab, nrog rau kev xa pa taws, dej, chav dej, thiab roj. Nws yog feem ntau siv nyob rau hauv kav dej, hvac systems, thiab qis- siab txheej txheem kab. A53 tau tseev kom muaj rau kev sim siab thiab hydrostatic kuaj, uas A252 tsis. Thaum qib A53 B muaj ib qho zoo sib xws lub zog rau A252 qib 3, nws cov cai yuav tsum siv thiab xeem ntawv ua haujlwm rau kev siv lub hauv paus piling.
### 5. Dab tsi yog astm A53 gr ib yam khoom?
ASTM A53 qib A yog qhov tshwj xeeb rau kev faib tawm dav dav- lub hom phiaj, welded thiab kub - dipped steelized steel yeeb nkab. Nws yog cov yeeb nkab roj carbon steel siv rau tsawg - cov kav dej plumbing, hvac system, fencing, thiab lwm yam kev siv tshuab.
Nws cov khoom tseem ceeb suav nrog:
* ** Kev kawm qib: ** "Ib qho" qhia txog qib kawm, nrog qeb kawm ib qho muaj qis dua qib B.
* ** PAUB lub zog: ** Qhov tsawg kawg nkaus kom meej lub zog yog 30,000 psi (205 mpa).
* ** Lub zog tensile: ** Qhov tsawg kawg tensile lub zog yog 48,000 psi (330 MPa).
Nws muaj nyob rau hauv ntau hom (hom e, hluav taws xob {{}}} welded welded; Nws tsis yog tsim los siv raws li cov qauv ntawm cov qauv lossis piling.
