1. Kev Tshawb Fawb: Yuav ua li cas thiaj li cuam tshuam cov hlau nruj
Txhua tus hlau ferritic (suav nrog Q295NH) pom kev hloov pauv ntawmductile rau brittle cwj pwmraws li qhov ntsuas kub tsawg dua. Qhov no txhais tau tias:
Thaum ntau dua kub:Cov hlau yog ductile. Thaum muaj kev cuam tshuam, nws yuav deform (nqus hluav taws xob) ua ntej poob qis.
Ntawm qis dua kub:Tus hlau ua nkig. Nws tuaj yeem tsoo nrog me me lossis tsis muaj deformation, nqus tau ntau lub zog tsawg dua.
Qhov tshwm sim no tau pom ntawm ib lub teeb kos npe"Charpy cuam tshuam xeem nkhaus."Txoj kev nkhaus qhia tau tias qhov nrawm nrawm hauv kev nqus hluav taws xob (Joules) dhau qhov ntsuas kub tshwj xeeb.
2. Yuav ua li cas Q295NH yog tsim los tawm tsam qhov no
Q295NH tsis yog cov qauv hlau; Nws yog aHigh - muaj zog tsawg -} Alloy alloy (HSLA) nrog kev txhim kho atmospheric corrosionCov. Nws cov tshuaj lom neeg muaj pes tsawg rau nws qhov qis-} kub ua tau:
Alloying ntsiab:Me me, tswj cov ntsiab lus xws liPhosphorus (p), tooj (CU), chromium (CR), thiab npib tsib caug (NI)tsis tsuas yog muab corrosion tsis kam tab sis kuj pab tau nyob rau hauv recining qauv qauv thiab txo qisductile - rau - brittle transittle hloov kub.
Daim ntawv "NH":Hauv Suav Txheem GB / T 4171, daim ntawv qhia"Nh"qhia tias cov hlau yog tsim rau atmospheric corrosion tsis kam thiab haum rau siv ntawmmuaj mob kub tsawg.
3. Cov qauv tsim nyog rau Q295NH
Tus qauv tsim nyog tshwj xeeb kev cuam tshuam cov txiaj ntsig nruj heev ntawm-20 degreethiab-40 Qib, ua pov thawj nws cov khoom haum rau cov chaw txias.
Raws liGB / T 4171, Qhov cuam tshuam hluav taws xob yuav tsum muaj rau Q295NH yog:
| Sim ntsuas kub | Yam tsawg kawg zaus nruab nrab cuam tshuam lub zog (Charpy V - Itch) |
|---|---|
| +20℃(chav ua hauj sam) | Ntau dua los yog sib npaug rau 34 j |
| -20 degree | Ntau dua los yog sib npaug rau 27 j |
| -40 Qib | Ntau dua los yog sib npaug rau 27 j |
Tseem ceeb takaway:Tus qauvyuav tsum taucov khoom siv los tuav cov qib tsawg kawg nkaus (27 joules) txawm nyob ntawm qhov kub thiab txias li-40 QibCov. Qhov no yog ib qho lees paub kev ua tau metric.
4. Kev sib piv nrog lwm qib
Q295NH vs. Q355NH:Q355NH muaj lub zog siab dua thiab feem ntau me ntsis zoo dua qis - kub tawv vim nws cov tshuaj sib txawv.
Q295NH VSS Cov qauv hlau (xws li Q235b):Q295NH yuav muaj cov qauv hluav taws xob ntau ntau rau cov hlau tsis muaj peev xwm siv rau cov khoom siv ntawm lub hom phiaj no thiab tsis tau lees paub cuam tshuam rau cov khoom siv ntawm -20℃lossis -40 degree.
5. Cov tswv yim cuam tshuam thiab cov lus pom zoo
Yog lawm, nws txo qis, tab sis nws txaus:Thaum lub sijhawm tawvyuavtxo qis dua ntawm -40℃dua ntawm +20 degree, lo lus nug tseem ceeb yog nws tseem nyobsaum toj no qhov tsawg kawg nkaus uas yuav tsum tau muaj rau cov txheej txheem kev nyab xeebCov. Rau Q295NH, nws yog tsim los ua li ntawd.
Txheeb xyuas cov ntawv pov thawj zeb:Yuav tsum txheeb xyuas qhov tseeb tiag Lub lav lees tias feem tsawg yog 27J, tab sis zoo Q295NH feem ntau cov kev kuaj siab ntau dua, muab cov npoo kev nyab xeeb ntau dua.
Tsim rau qhov xwm txheej tsis zoo tshaj plaws:Engineers yuav tsum siv tusqis tshaj plaws kev pabcuam kubCia siab tias yuav muaj rau cov qauv thiab xyuas kom cov khoom siv tau ntawv lees tias cuam tshuam lub zog ntawm lub zog uas tau sib ntsib lossis ntau dua tus qauv tsim.
Tej xwm txheej Fabrication:Cov txheej txheem xws li kev tsim kho txias thiab vuam yuav cuam tshuam rau cov khoom hauv zos. Cov txheej txheem vuam kom zoo siv cov huab cua sib txuam hluav taws xob hlau yog qhov tseem ceeb rau kev tswj kom muaj kev nruj nyob rau hauv cov cua sov {}} be} cuam tshuam cheeb tsam (Haz).
