ASTM A252, luam tawm los ntawm American Society for Testing and Materials (ASTM International), yog tus qauv tshwj xeeb tshwj xeeb rau welded thiab seamless carbon steel yeeb nkab pawg. Cov txheej txheem no yog los xyuas kom meej qhov zoo, kev ntseeg siab, thiab kev nyab xeeb ntawm cov yeeb nkab steel, uas tau siv dav hauv kev tsim vaj tsev hauv tsev, txuas hniav, thiab lwm yam qauv, muab kev txhawb nqa ruaj khov rau cov qauv no. Cov yeeb nkab steel cylindrical siv los ua cov khoom ruaj khov- cov kabmob cov kabmob, lossis cov yeeb nkab pawg ua cov cam khwb cia- nyob rau hauv - qhov chaw pob zeb pob zeb, txhua tus ua raws li tus qauv no.
Raws li qib zog, steel yeeb nkab pawg tau muab faib ua peb qib: Qib 1, Qib 2, thiab Qib 3. Qib 1 steel yeeb nkab pawg muaj lub zog txaus thiab toughness, haum rau feem ntau cov pa hauv paus engineering daim ntaub ntawv; Qib 2 muaj lub zog me ntsis siab dua Qib 1 thiab tau siv dav hauv qee qhov haujlwm dav dav nrog kev thauj khoom siab dua -cov kabmob muaj peev xwm; Qib 3 yog qib siab -lub zog steel yeeb nkab pawg, feem ntau yog siv rau cov haujlwm tshwj xeeb uas yuav tsum muaj lub zog siab heev lossis lub hauv paus engineering rau cov qauv tseem ceeb xws li cov tsev loj thiab cov txuas hniav, nrog lub zog tawm los thiab lub zog tensile deb tshaj thawj ob qib.
A252 Welded Steel Pipes Specification
Tshuaj muaj pes tsawg leeg ntawm A252 steel yeeb nkab
ASTM A252 Qib 3 Yeeb Nkab Mechanical Properties
Tsawg kawg Elongations
| Nominal Phab Ntsa Thickness | Elongation hauv 2 nti (50.8 mm), min, % | |||
|---|---|---|---|---|
| hauv. | mm | AATM A252 Qib 1 | ASTM A252 Qib 2 | ASTM A252 Qib 3 |
| 5⁄1 6 lossis 0.312 | 7.9 | 30 | 25 | 20 |
| 0.281 los yog 9 | 7.1 | 28.5 | 23.75 | 19 |
| 1⁄4 los yog 0.250 | 6.4 | 27 | 22.5 | 18 |
| 7.32 lossis 0.219 | 5.6 | 25.5 | 21.25 | 17 |
| 3⁄1 6 lossis 0.188 | 4.8 | 24 | 20 | 16 |
| 11⁄64 los yog 0.172 | 4.4 | 23.25 | 19.5 | 15.5 |
| 5⁄32 los yog 0.156 | 4 | 22.5 | 18.75 | 15 |
| 0.141 o 9 | 3.6 | 21.75 | 18.25 | 14.5 |
| 1⁄8 los yog 0.125 | 3.2 | 21 | 17.5 | 14 |
| 7.64 los yog 0.109 | 2.8 | 20.25 | 16.75 | 13.5 |
ASTM A252 Welded Pipe Test Requirements
Kev ntsuas nruj:Ntawm qhov kev xaiv ntawm cov chaw tsim khoom, cov qauv ntsuas nruj yuav tsum yog longitudinal lossis transverse strip test specimens, nrog rau qhov ntev ntawm 2 hauv.
Kev Ntsuas Kub: Kev txwv rau cov ntsiab lus P, thiab cov txiaj ntsig kub yuav tsum tau tshaj tawm hauv MTC rau cov neeg siv khoom.
Hydrostatic xeem: Tsis tas yuav Hydrotest
Sab nraud txoj kab uas hla: Sab nraud txoj kab uas hla ntawm cov yeeb nkab pawg yuav tsum tsis txhob sib txawv ntau tshaj 61% ntawm lub cheeb sab nraud.
Surface imperfections:Muaj qhov tob tsis tshaj 12.5% ntawm lub npe nominal phab ntsa thickness yuav tsum tau. Nws yuav tsum tau tso cai los tsim kom muaj qhov tob ntawm xws li
imperfections los ntawm kev sib tsoo los yog ntaub ntawv.
Ntim thiab shipping
