Puas yog A537 Class 3 haum rau kev pabcuam cryogenic?
A537 Chav Kawm 3 (los yog ASTM A537 / ASME SA537 Chav Kawm 3) yog hais txog lub tshav kub- kho, quenched, thiab tempered carbon-manganese-silicon steel phaj tsim rau fusion-welded siab hlab ntsha thiab boilers, muab lub zog siab dua (Yield ntau dua 510 MP, ughness / 51 kcal) zoo tagnrho rau nruab nrab kub kev pab cuam nyob rau hauv roj, roj, thiab tshuaj industries. Nws tau paub txog kev sib npaug ntawm lub zog thiab txhim kho cov khoom cuam tshuam, nrog rau cov kev xav tau tshwj xeeb tempering (tsis tsawg dua 1150℃F / 620℃).
Puas yog A537 Class 3 haum rau kev pabcuam cryogenic?
Yog lawm, A537 Chav Kawm 3 tau tsim tshwj xeeb thiab tsim nyog rau cov kev pabcuam cryogenic, ua rau nws xaiv tus qauv rau ntau qhov xav tau qis -kub siv. Nws qhov kev tsim nyog tsis yog qhov dav tab sis raug txheeb xyuas thiab tau lees paub los ntawm kev ntsuam xyuas tshwj xeeb.
Cov laj thawj tseem ceeb rau Nws Cryogenic Suitability:
Engineered rau Low Temperatures:Nws quenched thiab tempered (Q&T) microstructure muab kev sib xyaw tshwj xeeb ntawm lub zog siab thiab zoo tshaj qhov tsis zoo, uas yog qhov tseem ceeb los tiv thaiv kev tawg tawg hauv qhov chaw cryogenic.
Kev Tswj Xyuas Txheej Txheem & Kev Xeem:ASTM A537 tus qauv tswj hwm Charpy V-Notch (CVN) cuam tshuam kev ntsuas rau Chav Kawm 3. Thaum qhov ntsuas kub tiag tiag yog tus yuav khoom- qhia, Chav 3 feem ntau raug txiav txim nrog kev ntsuas qhov cuam tshuam ntawm -75℃F (-60 degree) lossis qis dua (xws li -100℃F / -73 degree). Ib qho kev lees paub zoo yog qhov tsawg kawg nkaus qhov nruab nrab nqus lub zog ntawm 40 ft-lbf (54 J) lossis siab dua.
Hom Cryogenic Daim Ntawv Thov Ntau Yam:
Nws yog feem ntau thiab ntseeg tau siv rau kev pabcuam kub mus rau -75℃F (-60 degree).
Nrog rau kev tswj xyuas nruj dua thiab kev kho cua sov tshwj xeeb, nws cov ntawv pov thawj tuaj yeem txuas mus rau kwv yees li -100℃F (-73 degree) raws li cov ntaub ntawv cuam tshuam.
Rau qhov kub hauv qab -100℃F (tshwj xeeb tshaj yog qis dua -150℃F / -101 degree), nickel-alloy steels (piv txwv li, ASTM A553 Hom I lossis Hom II) lossis stainless hlau feem ntau yuav tsum tau.
Kev siv Cryogenic:
Cia Tank & Siab Vessels:Rau cov roj liquefied xws li Liquefied Natural Gas (LNG), ethylene, ethane, thiab propane.
Cov khoom siv ua haujlwm:Hauv kev sib cais cryogenic, tub yees, thiab roj ua cov nroj tsuag.
Kev thauj mus los:Rau cov qauv txheej txheem ntawm cryogenic railcars thiab ISO ntim.
Cov xwm txheej tseem ceeb rau kev siv:
Nws qhov haum tsis yog tsis siv neeg. Txhawm rau kom muaj kev nyab xeeb thiab kev ua raws cai, cov hauv qab no yuav tsum txaus siab:
Raws li Specification:Daim ntawv xaj yuav tsum tau qhia meej meej txog qhov yuav tsum tau ua Yam Tsawg Tsim Hlau Kub (MDMT) thiab qhov sib thooj Charpy ntsuas kub thiab lub zog xav tau (ib ASME BPVC Tshooj VIII lossis lwm cov lej).
Thickness kev xav:Toughness yog thickness -nyob ntawm. Cov ntawv pov thawj cuam tshuam qhov tseem ceeb siv rau ib lub phaj tuab. Cov phaj tuab tuaj yeem txo qhov tawv thiab yuav tsum tau kuaj xyuas ntxiv.
Welding Procedure Qualification:Cov txheej txheem vuam (WPS) yuav tsum tsim nyog nrog kev ntsuas cuam tshuam ntawm vuam thiab cua sov- thaj chaw cuam tshuam (HAZ) daim coupon ntawm lossis qis dua MDMT. Lub hauv paus hlau lub toughness tuaj yeem cuam tshuam los ntawm kev vuam tsis raug.
ASTM boiler qib A537 chav kawm 3 siab nkoj steel phaj tshuaj muaj pes tsawg leeg:
| Qib | C | Mn | P | S | Si | Cu | Ni | Cr | Mo |
| A537 chav 3 | 0.24 | 0.92-1.72 | 0.035 | 0.035 | 0.13-0.55 | 0.38 | 0.28 | 0.29 | 0.09 |
Txhua yam khoom ntawm A537 chav kawm 3 steel phaj ntawm ambient kub:
| Qib | Thickness (hli) | Tsawg-yield (Mpa) | Tensile (MPa) | Elongation (%) |
| A537 chav 3 | 8mm-65 hli | Min 380 Mpa | 550-690 Mpa | 22% |
| 66mm-100 hli | Min 345 Mpa | 515-655 Mpa | 22% | |
| 101mm-150mm | Min 275 Mpa | 485-620 Mpa | 20% |
1.A537 Chav Kawm 3 yog dab tsi?
A537 Class 3 yog lub siab -lub zog, tshav kub{3}} kho carbon-manganese-silicon steel phaj tsim rau welded siab hlab ntsha, muab superior notch toughness thiab siab zog dua Class 1 thiab Class 2 rau tej thickness ranges.
2.Dab tsi yog cov khoom siv tshuab ntawm A537 Chav Kawm 3?
Rau cov phaj siab txog li 2.5 ntiv tes tuab, A537 Chav Kawm 3 feem ntau muaj qhov tsawg kawg nkaus tawm lub zog ntawm 80 ksi (550 MPa) thiab lub zog tensile yam tsawg kawg nkaus ntawm 95 ksi (655 MPa), nrog rau qhov yuav tsum tau muaj zog toughness feem ntau nruj dua Chav Kawm 2.
3.Dab tsi yog kev kho cua sov rau A537 Chav Kawm 3?
A537 Chav Kawm 3 yog nkag rau hauv qhov kub thiab txias, zoo ib yam li Chav Kawm 2, tab sis tuaj yeem koom nrog cov txheej txheem nruj dua kom ua tiav cov khoom muaj zog.
4.Dab tsi yog qhov txawv ntawm A537 Class 2 thiab Class 3?
Qhov sib txawv tseem ceeb yog nyob rau hauv cov kev xav tau toughness thiab qee zaum lub zog rau cov phaj tuab. Chav Kawm 3 tau teev tseg rau kev txhim kho qis- qhov kub thiab txias cuam tshuam, feem ntau nrog kev nruj dua Charpy V-Notch qhov yuav tsum tau ua, ua rau nws tsim nyog rau kev siv qhov kub thiab txias dua.
5.Dab tsi yog Charpy cuam tshuam yuav tsum tau rau A537 Class 3?
Txawm hais tias qhov tseem ceeb tshwj xeeb yog nyob ntawm qhov tuab thiab kev txiav txim siab, Chav Kawm 3 feem ntau xav tau Charpy V-Kev ntsuas ntsuas ntsuas ntawm qhov ntsuas kub qis (piv txwv li, -75℃F/-60 degree) nrog ntau dua absorbed zog minima (piv txwv li, 40-50 ft-lbs) piv rau Chav Kawm 2.
6.Qhov twg yog A537 Chav Kawm 3 nquag siv?
Nws yog siv nyob rau hauv ib qho tseem ceeb tsawg- daim ntawv thov kub xws li cov roj liquefied tso tsheb hlau luam, offshore platforms nyob rau hauv arctic ib puag ncig, thiab cov hlab ntsha siab yuav raug rau cov kev pab cuam txias heev.
7.Yog A537 Class 3 weldable?
Yog lawm, tab sis nws yuav tsum tau ua cov txheej txheem vuam nruj zoo ib yam li Chav Kawm 2, suav nrog kev siv qis - hydrogen electrodes, tswj preheat, thiab feem ntau tshaj tawm -weld cua sov kho kom muaj zog hauv tshav kub- thaj tsam cuam tshuam.
8.Dab tsi yog qhov siab tshaj plaws thickness muaj rau A537 Class 3?
Tus qauv npog daim hlau txog li 6 ntiv tes (150 hli), tab sis cov khoom siv kho tshuab, tshwj xeeb tshaj yog tawv, yog tuab- nyob ntawm thiab yuav tsum tau kuaj xyuas rau ASTM A537 cov ntxhuav rau Chav Kawm 3.
9.Yog A537 Chav Kawm 3 haum rau kev pabcuam cryogenic?
Yog lawm, nws cov kev tsim nyog ua kom muaj zog ua kom nws haum rau cryogenic thiab sub- xoom daim ntawv thov, feem ntau nqes mus rau -75℃F (-60 degree) lossis qis dua, nyob ntawm qhov kev xav tau ntawm cov kev ntsuas cuam tshuam.
10.A537 Class 3 piv rau ASTM A553 Hom I li cas?
Ob leeg yog quenched thiab tempered steels rau qis -kev pab kub. A553 Hom I yog 9% npib tsib xee alloy hlau rau qhov kub tsis tshua muaj siab, thaum A537 Class 3 yog cov pa roj carbon-manganese-silicon steel nrog kev txhim kho toughness rau nruab nrab qhov kub thiab txias, muab tus nqi ntau dua - kev daws teeb meem zoo rau qee qhov tshwj xeeb.
Tag nrho cov specification thiab cov ntsiab lus muaj nyob rau ntawm kev thov. Cov ntaub ntawv saum toj no yog muab rau kev taw qhia nkaus xwb. Rau kev tsim tshwj xeeb thov hu rau peb cov neeg ua haujlwm muag khoom.
