Dab tsi yog qhov txawv ntawm ASTM A53 thiab ASTM A252?
Qhov sib txawv tseem ceeb ntawm ASTM A53 thiab ASTM A252 cov kav dej yog raws li hauv qab no:
Standard Positioning thiab Applications
A53: Cov qauv carbon steel yeeb nkab dav dav, haum rau cov khoom siv tsis yog -pile daim ntaub ntawv xws li cov qauv tsev thiab cov khoom siv tshuab.
A252: Tshwj xeeb tsim rau pawg kav, yuav tsum tau siv raws li kev thauj mus tas li -cov tswv cuab lossis cov pob zeb pob zeb.
Cov ntaub ntawv thiab cov txheej txheem
A53: Tso cai seamless lossis hluav taws xob tiv thaiv vuam (ERW) cov txheej txheem, tsis muaj kev tshwj xeeb rau welds.
A252: Yuav tsum siv submerged arc welding (LSAW/SSAW) cov txheej txheem, nrog rau cov welds yuav tsum muaj tag nrho - ntev soj ntsuam.
Kev xav tau kev ua haujlwm
Lub zog: A252 GR2 muaj lub zog tawm los Ntau dua lossis sib npaug ntawm 205 MPa, siab dua A53 qib sib npaug.
Kev sim: A252 mandates hydrostatic testing and ultrasonic inspection, hos A53 tsuas yog yuav tsum tau kuaj hydrostatic standard.
Daim ntawv thov Scenario
A53: Kev them nyiaj yug ib ntus, tsis yog -load- cov qauv kabmob.
A252: Lub hauv paus ruaj khov, choj lub hauv paus, thiab lwm yam haujlwm tseem ceeb hauv engineering.
ASTM A53 Specification yog dab tsi
General carbon steel yeeb nkab txheem, siv tau rau tsis yog - pawg xwm txheej zoo li lub tsev thiab cov khoom siv tshuab. Tso cai seamless lossis ERW cov txheej txheem uas tsis muaj qhov tshwj xeeb weld. Cov ntawv thov ib txwm muaj xws li kev txhawb nqa ib ntus thiab tsis yog- thauj khoom- cov qauv kabmob.
ASTM A252 specification yog dab tsi?
Tshwj xeeb tsim los rau pawg kav dej, yuav tsum tau siv raws li kev thauj mus tas li -cov tswv cuab lossis cov pob zeb pob zeb. Mandates submerged arc welding (LSAW/SSAW) nrog rau tag nrho -length weld soj ntsuam. Cov ntawv thov ib txwm suav nrog cov hauv paus ruaj khov thiab cov hauv paus txuas hniav hauv cov haujlwm tseem ceeb engineering.
Chemical Composition ntawm ASTM A252 Qib Pipes
| Lub ntsiab | Cov ntsiab lus ntau (ntau%) | Lus hais |
|---|---|---|
| Cov pa roj carbon (C) | Tsawg dua lossis sib npaug li 0.25 | Xyuas kom weldability |
| Manganese (Mn) | 0.80-1.20 | Txhim khu lub zog thiab toughness |
| Phosphorus (P) | Tsawg dua lossis sib npaug li 0.040 | Kev tswj nruj kom txo qis brittleness |
| Sulfur (S) | Tsawg dua lossis sib npaug li 0.050 | Cov ntsiab lus impurity, cov ntsiab lus yuav tsum txwv |
| Silicon (Si) | 0.15-0.40 | Pab txhawb zog |
| Hlau (Fe) | Tshuav | Lub hauv paus ntsiab lus |
Mechanical Properties
Tensile zog: Ntau dua lossis sib npaug rau 455 MPa
Yield zog: Ntau dua lossis sib npaug rau 310 MPa
Elongation: Ntau dua lossis sib npaug li 20% (rau phab ntsa thickness Ntau dua lossis sib npaug li 7.9 hli)
Kev Tsim Khoom & Kev Ntsuas Cov Cai
Vuam txheej txheem: Yuav tsum siv submerged arc vuam (LSAW/SSAW), nrog rau tag nrho -length weld soj ntsuam.
Cov qauv xeem: Hydrostatic kuaj, kuaj ultrasonic, thiab lwm yam., kom tsis txhob muaj kab nrib pleb lossis laminations.
Daim ntawv thov Scenario
Tsim nyog rau cov haujlwm tseem ceeb hauv engineering xws li cov hauv paus ruaj khov thiab cov hauv paus hniav, yuav tsum muaj kev thauj khoom siab -cov kabmob muaj peev xwm thiab kav ntev.
astm a252 qib 2 steel yeeb nkab qhov ntev
ASTM A252 Qib 2 steel yeeb nkab qhov ntev sib txawv los ntawm cov chaw tsim khoom thiab cov kev xav tau tshwj xeeb, tab sis tus qauv specification npog sab nrauv
txoj kab uas hla ntawm NPS 1 txog NPS 24(33.4-}609.6mm). Phab ntsa tuab feem ntau yog li ntawm 3-12 hli, thiab qhov ntev tuaj yeem yog 3 txog 18 meters, lossis raws li cov neeg siv khoom tshwj xeeb. Qhov loj me yog raws li ASME B36.10M cov qauv lossis cov neeg siv khoom xav tau.
