1. Q: Dab tsi yog ASTM A333 qib 4?
A:
Nws yog cov pa roj carbon kub tsawg-roj carbon hlau uas tsim rau qhov chaw tsawg-ib puag ncig (qis rau -45 degree).
Nws cov tshuaj lom neeg muaj pes tsawg leeg yog feem ntau carbon, manganese, thiab silicon, nrog me me ntawm phosphorus thiab leej faj. Nws tsis muaj cov tshuaj ntxiv ntxiv thiab cov khoom pov thawj zoo heev qis-kub thiab muaj hwj chim.
Nws ua raws li Astm A333, uas zoo ib yam li tus qauv hauv tsev GB / T 18984 (Seamless steel yeeb nkab rau cov kav hlau qis).
2. Q: Dab tsi yog qhov sib txawv ntawm qib 4 thiab lwm qib (xws li Qib 1/6)?
A:
Muaj ntau yam: Qib 4 (-45 degree) poob ntawm qib 1 (-50 degree) thiab qib 6 (-100 degree).
Kev sib xyaw sib txawv: Qib 4 muaj ib nyuag cov khoom siv roj carbon ntau dua qib 6 (tom kawg muaj ob lub npib tsawg rau kev txhim kho tsawg-ntsuas kub).
Lub zog sib piv: Qib 4 tensile lub zog yog ntau dua los yog sib npaug dua li qib 1 (siab dua lossis muaj ntau dua li qib 6 (ntau dua lossis sib npaug ntawm 485 MPa).
3. Q: Cov chaw thov app yog dab tsi?
A:
Cryogenic cov ntawv luam dej: liquefied nkev (LNG), ua kua nitrogen / cov kua pa oxygen / thiab cov tub yees khoom hauv tub yees.
Tshuaj thiab lub zog: Cryogenic sib cais nyob rau hauv Petroleum Refining thiab tub yees tsev piping.
Tsev qauv qauv: Cov ntaub ntawv txheej txheem hluav taws xob xa xov hauv cov cheeb tsam txias (xws li Arctic lub voj voog).
4. Q: Yuav tsum ceev faj dab tsi thaum mus rau thaum vuam thiab ua?
A:
Preheating yuav tsum muaj: cov kav dej tuab uas yuav tsum muaj cov roj ntsa kom tiv thaiv kom tiv thaiv kev tawg txias.
Vuam Consumables: Cov hluav taws xob qis (xws li E7018) lossis txuam nrog cov xaim hluav taws xob arc yog pom zoo.
Kev kho mob tom qab Weld: Kev kho kom qeeb qeeb yog pom zoo kom tiv thaiv kev ntxhov siab ntau dua los ntawm kev cuam tshuam qhov kub tsawg.
5
A:
Kev Ntsuas Qhov Kev Ntsuas: Charpy V-Motch cuam tshuam kev cuam tshuam ntawm -45 degree, nrog ib qho hnoos qeev, nrog ib qho kev xav tau loj dua los yog sib npaug).
Tsis yog-kev sim ua phem: Ultrasonic (UT) lossis Xov Xwm (RT) Kev Tshuaj Ntsuam Weld Tsis Txaus Siab.
Kev Kuaj Hardness: Xyuas kom cov tom qab hardness yog tsawg dua lossis sib npaug ntawm 22 hrc kom tiv thaiv embrittlement.
