Qhov txawv ntawm S275JR thiab S275J0 yog dab tsi?
Qhov sib txawv ntawm S275JR thiab S275J0 tsuas yog nyob rau hauv lawv cov kev cuam tshuam toughness (notch toughness) ntawm qhov sib txawv kub. Tag nrho lwm yam khoom tseem ceeb (yield zog, tensile zog, elongation) zoo tib yam.
Qhov no yog qhov sib txawv tseem ceeb rau cov qauv kev nyab xeeb, tshwj xeeb tshaj yog nyob rau hauv qhov chaw txias dua.
Ntawm no yog ib daim ntawv qhia meej thiab meej:
Core Sib txawv: Impact Toughness Test Temperature
Hauv cov ntsiab lus yooj yim: S275J0 tau lees paub los nqus tib lub zog tsawg kawg nkaus li S275JR, tab sis ntawm qhov kub thiab txias. Qhov no ua rau nws resistant rau nkig tawg nyob rau hauv txias tej yam kev mob.
Lub Suffixes txhais li cas:
S:Cov qauv hlau
275:Yam tsawg kawg nkaus tawm lub zog hauv MPa (rau thickness Tsawg dua lossis sib npaug li 16 hli)
J:Qhia txog qhov yuav tsum tau muaj rau Charpy V-qhov cuam tshuam lub zog.
R:Stands rau "Room Kub" (kev sim cuam tshuam ntawm +20℃).
0:Qhia qhov ntsuas qhov ntsuas kub yog 0 degree.
(Rau kev siv, S275J2 yuav raug kuaj ntawm -20℃rau qhov chaw txias dua.)
Yog vim li cas qhov txawv no teeb meem: Qhov pheej hmoo ntawm brittle Fracture
Cov hlau tau dhau los ua cov ntaub nplaum - mus rau - kev hloov pauv hloov. Raws li qhov kub thiab txias, hlau tuaj yeem poob nws lub peev xwm los deform plastically (ductility) thiab tej zaum yuav tawg sai sai nrog kev ceeb toom me ntsis -qhov no yog nkig puas.
Siv S275JR nyob rau hauv ib puag ncig uas ncav cuag 0℃qhia txog kev pheej hmoo. Ntawm nws qhov kev tsim nyog txwv (20 degree), nws cov tawv tawv tsis tau lees paub, muaj peev xwm ua rau nws muaj peev xwm ua kom tawg tawm los ntawm qhov tsis xws luag, vuam tsis xws luag, lossis kev ntxhov siab.
S275J0 yog lav kom tswj tau qhov tsawg kawg nkaus toughness ntawm 0 degree, muab qhov tseem ceeb ntawm kev nyab xeeb. Nws yog qhov tsawg kawg nkaus pom zoo qib rau ib qho kev thauj khoom -cov kabmob steel qauv raug rau lub caij ntuj no kub hauv huab cua sov.
Txoj Cai Xaiv:
Xaiv S275JR yog tias: Cov qauv nyob hauv tsev hauv ib lub tsev uas muaj cua sov lossis nyob hauv qhov chaw huab cua uas cov hlau kub yuav tsis ncav cuag 0℃thaum nws tsim lub neej.
Xaiv S275J0 yog tias: Cov qauv yog sab nraum zoov, tsis muaj cua sov, lossis hauv ib puag ncig uas cov hlau kub tuaj yeem ncav cuag 0℃lossis qis dua. Qhov no feem ntau yog qhov yuav tsum tau ua hauv cov cai hauv tsev rau kev ua haujlwm steel hauv cov cheeb tsam txias.
Suav sib npaug (GB/T 1591-2018):
S275 JR → Q275B(Kuaj ntawm +20 degree)
S275J0 → Q275C(Kuaj ntawm 0 degree)
Xaus:
S275JR thiab S275J0 yog mechanically zoo tib yam nyob rau hauv lub zog thiab ductility. Qhov ib leeg tab sis qhov sib txawv tseem ceeb yog tias S275J0 tsim nyog siv rau hauv qhov txias dua (txog 0 degree), ua rau nws yog qhov tsim nyog xaiv rau sab nraum zoov thiab nthuav tawm cov qauv hauv feem ntau ntawm cov teb chaws Europe thiab lwm qhov chaw sov. Kev qhia txog qib raug raws li qhov ntsuas qhov ntsuas qis tshaj plaws yog qhov kev txiav txim siab txog kev nyab xeeb hauv kev tsim vaj tsev.
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.
