Dab tsi yog qhov txawv ntawm S275J0 thiab S275J2 thiab SS275JR?
Qhov sib txawv ntawm JR, J0, thiab J2 nyob rau hauv cov qib steel (xws li S235JR, S355J0) yog hais txog qhov kub thiab txias ntawm cov hlau lub zog yog sim siv Charpy impact test, nrog 'J' qhia qhov ntsuas thiab 'R', '0', lossis '2' sawv cev rau qhov kub thiab txias: JR yog kuaj ntawm chav tsev kub 20, J 2, thiab 2℃ntawm qhov kub thiab txias. -20 degree, nrog rau txhua tus feem ntau xav tau 27 Joules ntawm lub zog rau pob txha, ua J2 tougher rau txias txias dua J0, thiab JR tus qauv rau kev siv dav dav.Ntawm no yog cov ncauj lus kom ntxaws sib piv ntawm S275JR, S275J0, thiab S275J2 raws li cov tshuaj lom neeg muaj pes tsawg leeg thiab cov cuab yeej cuab tam raws li 10 EN.
S275JR khoom yog dab tsi?
S275JR yog ib qho tsis yog- alloy structural steel qib ib EN 10025-2. Nws yog rimmed steel qhov twg "R" qhia txog kev cuam tshuam ntawm +20℃nrog lub zog tsawg kawg nkaus ntawm Ntau dua lossis sib npaug ntawm 27 J. Nws muaj lub zog tawm los ntawm Ntau dua lossis sib npaug rau 275 MPa thiab yog tus nqi -kev xaiv zoo rau cov ntawv thov zoo li qub hauv cov huab cua nruab nrab uas tsis muaj qhov kub thiab txias tsis tas yuav tsum muaj.
S275J0 khoom yog dab tsi?
S275J0 yog cov hlau tua ib qho EN 10025-2, nrog txhim kho homogeneity vim tag nrho deoxidation. Qhov "J0" qhia tias nws raug kuaj ntawm 0℃nrog ntau dua lossis sib npaug li 27 J yam tsawg kawg nkaus. Nws muaj tib yam Zoo dua los yog sib npaug rau 275 MPa yield zog li S275JR tab sis haum rau cov qauv dav dav hauv cov cheeb tsam huab cua uas qhov kub tuaj yeem mus txog qhov khov.
S275J02 yog dab tsi?
S275J2 kuj yog cov hlau tua nyob rau hauv EN 10025-2, tab sis tau teev tseg rau cov mob hnyav dua. Lub "J2" txhais tau hais tias nws muaj kev cuam tshuam los ntawm -20℃nrog ntau dua lossis sib npaug ntawm 27 J yam tsawg kawg nkaus, lav zoo toughness hauv huab cua txias. Nrog rau qhov loj dua lossis sib npaug ntawm 275 MPa cov txiaj ntsig, nws yog qib nyiam rau cov qauv tseem ceeb lossis cov khoom siv hluav taws xob hauv qhov chaw txias.
1. Chemical Composition Comparison (Qhov Zoo Tshaj Plaws, %)
Qhov sib txawv ntawm cov tshuaj lom neeg yog nyob rau hauvkev ua kom deoxidation, tsis yog lub ntsiab txwv. Tag nrho peb qib sib koom yuav luag zoo tib yam cov tshuaj muaj pes tsawg leeg.
| Element | S275 JR | S275J0 | S275J2 | Nco tseg |
|---|---|---|---|---|
| Cov pa roj carbon (C) | Tsawg dua lossis sib npaug li 0.21 | Tsawg dua los yog sib npaug li 0.20 | Tsawg dua los yog sib npaug li 0.20 | Me ntsis qis max C hauv J0 / J2 kom zoo dua weldability. |
| Manganese (Mn) | Tsawg dua lossis sib npaug li 1.50 | Tsawg dua lossis sib npaug li 1.50 | Tsawg dua lossis sib npaug li 1.50 | Tib yam txwv. |
| Phosphorus (P) | Tsawg dua lossis sib npaug li 0.035 | Tsawg dua lossis sib npaug li 0.035 | Tsawg dua lossis sib npaug li 0.035 | Ib yam. Ua phem impurity, khaws cia tsawg. |
| Sulfur (S) | Tsawg dua lossis sib npaug li 0.035 | Tsawg dua lossis sib npaug li 0.035 | Tsawg dua lossis sib npaug li 0.035 | Ib yam. Ua phem impurity, khaws cia tsawg. |
| Silicon (Si) | Tsawg dua los yog sib npaug rau 0.035 (rau rimming) | Tsawg dua los yog sib npaug li 0.55 | Tsawg dua los yog sib npaug li 0.55 | Qhov txawv tseem ceeb: Tsawg Si hauv JR vim yog txheej txheem rimming. Siab Si hauv J0 / J2 ua deoxidizer. |
| Nitrogen (N) | Tsawg dua lossis sib npaug li 0.012 | Tsawg dua lossis sib npaug li 0.012 | Tsawg dua lossis sib npaug li 0.012 | Ib yam. Tswj kom toughness. |
| Aluminium (zeeg) | Tsis xav tau | Ntau dua lossis sib npaug rau 0.020 (los yog lwm yam min.) | Ntau dua lossis sib npaug rau 0.020 (los yog lwm yam min.) | Qhov txawv tseem ceeb: J0 / J2 xav tau min. Al los xyuas kom meej "tua" steel. JR tsis muaj qhov xav tau li ntawd. |
2. Mechanical Properties Comparison txog S275J0 thiab S275J2 thiab SS275JR (rau thickness Tsawg dua los yog sib npaug li 16 hli)
Tag nrho peb cov kev xav tau muaj zog tib yam. Qhov tseem ceeb sib txawv yog nyob rau hauv guaranteed cuam tshuam toughness.
| Khoom | S275 JR | S275J0 | S275J2 | Nco tseg |
|---|---|---|---|---|
| Yield zog (ReH) | Ntau dua lossis sib npaug li 275 MPa | Ntau dua lossis sib npaug li 275 MPa | Ntau dua lossis sib npaug li 275 MPa | Yam tsawg kawg nkaus yuav tsum tau. |
| Tensile zog (Rm) | 410 - 560 MPa | 410 - 560 MPa | 410 - 560 MPa | Sib npaug ntau yam. |
| Elongation (A₅) | Ntau dua lossis sib npaug li 23% | Ntau dua lossis sib npaug li 23% | Ntau dua lossis sib npaug li 23% | Zoo tib yam yam tsawg kawg nkaus ductility. |
| Impact Toughness (KV) | Ntau dua lossis sib npaug li 27 J ntawm +20 degree | Ntau tshaj lossis sib npaug rau 27 J ntawm 0 degree | Ntau dua lossis sib npaug li 27 J ntawm -20 degree | LUB TSEV KAWM NTAWV. Txhais qhov ntsuas kub ntawm daim ntawv thov. |
| Kev xyaum deoxidation | Rimmed (R) | Tua (J) | Tua (J) | Txhais lub homogeneity thiab sib xws. |
Summary Table: Xaiv Phau Ntawv Qhia
| Qib | Deoxidation | Qhov tseem ceeb Chemical Trait | Ntsiab Mechanical Trait | Qhov zoo tshaj plaws siv rau |
|---|---|---|---|---|
| S275 JR | Rimmed | Tsawg Si, Tsis xav tau Al | Toughness ntawm +20℃nkaus xwb | Static, non{0}}cov qauv tseem ceeb hauv huab cua sov, tswj tau. Kev lag luam feem ntau. |
| S275J0 | Tua | Siab Si, Min. Al xav tau | Toughness ntawm 0 degree | Cov qauv dav dav hauv huab cua sov nrog qee zaus khov. Kev xaiv sib npaug. |
| S275J2 | Tua | Siab Si, Min. Al xav tau | Toughness ntawm -20 degree | Cov qauv tseem ceeb hauv cov huab cua txias lossis nrog cov khoom hnyav. Kev xaiv zoo tshaj plaws rau kev ua kom tawv. |
Xaus:Rau tus tsim qauv, kev xaiv tsis yog hais txog lub zog, tab sis hais txog kev pabcuam ib puag ncig thiab yuav tsum tau muaj kev lees paub zoo. S275J2 muab qhov kev lees paub siab tshaj plaws tiv thaiv cov pob txha tawg hauv qhov txias lossis tsis muaj zog, thaum S275JR yog tus nqi- kev xaiv zoo rau qhov chaw zoo, zoo li qub. S275J0 txuas qhov sib txawv rau kev siv dav dav.
1. Lub ntsiab lus ntawm "J0" hauv S275J0 yog dab tsi?
Lub "J0" qhia tias cov hlau raug tua tag nrho (deoxidized) thiab muaj qhov tshwj xeeb cuam tshuam qhov hnyav ntawm tsawg kawg 27 joules thaum kuaj ntawm 0 degree. Lub "J" txhais tau hais tias tua cov hlau nrog lav qhov cuam tshuam tus nqi, thiab "0" qhia qhov ntsuas kub.
2. Dab tsi yog qhov txawv ntawm S275J0 thiab S275J2?
Qhov sib txawv tseem ceeb yog qhov ntsuas kub ntawm qhov ntsuas kub: S275J0 yog kuaj ntawm 0 degree, thaum S275J2 kuaj ntawm -20 degree. Qhov no ua rau S275J2 haum rau cov kev pabcuam txias dua li S275J0.
3. Puas yog S275J0 haum rau kev tsim kho lub caij ntuj no?
S275J0 feem ntau haum rau lub caij ntuj no me me uas qhov kub tsis tshua muaj qis qis qis qis. Rau qhov sib xws sub-zero kub, S275J2 lossis S275J2+N (normalized) yuav yog qhov kev xaiv zoo dua vim lawv qhov kub thiab txias.
4. Lub zog tawm ntawm S275J0 yog dab tsi?
S275J0 muaj qhov tsawg kawg nkaus tawm lub zog ntawm 275 MPa rau tuab txog 16 hli, zoo ib yam rau lwm qib S275. Lub zog txo qis nrog nce cov khoom tuab raws li tau teev tseg hauv EN 10025-2.
5. S275J0 puas tuaj yeem welded yooj yim?
Yog lawm, S275J0 muaj qhov zoo weldability zoo ib yam li lwm yam S275 tua steels, nrog cov ntsiab lus carbon feem ntau qis dua 0.20% thiab homogeneous microstructure uas teb tau zoo rau cov txheej txheem vuam tsis muaj ua ntej - cua sov rau feem ntau daim ntawv thov.
6. S275J0 feem ntau siv qhov twg?
Nws yog feem ntau siv nyob rau hauv kev siv cov qauv siv nyob rau hauv temperate climates, xws li lub tsev thav duab, industrial platforms, thiab machinery kev txhawb nqa qhov twg muaj feem xyuam rau loading ntawm nruab nrab kub yog ib tug xav txog.
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.
