S275J2 yog tus qauv European (EN 10025-2) tsis yog- alloy structural steel paub rau nws cov weldability zoo, formability, thiab toughness, tshwj xeeb tshaj yog nyob rau hauv qis kub, qhia los ntawm "J2" (27 joules cuam tshuam lub zog ntawm -20 degree). Nws muaj qhov tsawg kawg nkaus tawm lub zog ntawm 275 MPa, ua rau nws muaj ntau yam, high-tensile steel siv nyob rau hauv txuas hniav, fais fab nroj tsuag, thiab cua yees, feem ntau muab normalized los yog tswj dov.
Cov yam ntxwv tseem ceeb:
S275: Qhia qhov tsawg kawg nkaus lub zog ntawm 275 MPa (N / mm²).
J2: Qhia txog Charpy V-qhov ntsuas qhov cuam tshuam ntawm -20 degree, yuav tsum muaj tsawg kawg 27 Joules ntawm lub zog.
Cov pa roj carbon tsawg: Tsawg- carbon, siab- tensile steel uas yooj yim weldable.
Khoom:
Yield zog: Yam tsawg kawg 275 MPa.
Tensile zogSiab: 430-580 MPa.
Elongation: Nyob ib ncig ntawm 23%.
Hardness: Feem ntau 130-180 HB (Brinell).
Daim ntawv thov:
Cov hom phiaj dav dav.
Kev tsim kho choj.
Cov nroj tsuag muaj zog.
Cua ntauwd Cheebtsam.
Puas yog S275J2 sib npaug rau ASTM A572 Qib 50?
Tsis yog, S275J2 tsis sib npaug rau ASTM A572 Qib 50. Txawm hais tias ob qho tib si yog cov qauv hlau, lawv sib txawv ntawm lub zog, kev xav tau, thiab kev tsim qauv, ua rau lawv tsis tsim nyog rau kev hloov ncaj qha yam tsis muaj kev ntsuam xyuas engineering.
Qhov txawv tseem ceeb:
| Khoom | S275J2 (EN 10025-2) | ASTM A572 Qib 50 (USA) |
|---|---|---|
| Yam tsawg kawg nkaus Yield Strength | 275 MPa (≈40 ksi) | 345 MPa (50 ksi) |
| Tensile zog | 410-560 MPa | 450-550 MPa |
| Impact Toughness | Yuav tsum tau: 27 J ntawm -20 degree | Tsis xav tau los ntawm lub neej ntawd (tsuas yog hais txog Charpy ntxiv) |
| Hom khoom | Tsis yog{0}} hlau alloy (me me steel) | High-lub zog qis- alloy (HSLA) steel |
| Kev tswj hwm tus qauv | Teb chaws Europe (EN) | Asmeskas (ASTM) |
| Hom Siv Case | Txias-cov qauv kev nyab xeeb (bridges, towers, offshore) qhov twg low-kub toughness yog qhov tseem ceeb. | General siab -cov ntaub ntawv siv lub zog (cov tsev, txuas hniav) qhov kev txo qhov hnyav yog qhov tseem ceeb. |
Yog vim li cas lawv tsis sib npaug:
Strength Discrepancy:
A572 Qib 50 muaj ≈25% siab dua qhov qis tshaj tawm lub zog (345 MPa vs . 275 MPa). Qhov no txhais tau hais tias A572 Qib 50 tuaj yeem txhawb nqa hnyav dua lossis tso cai rau cov ntu sib zog rau tib lub load piv rau S275J2.
Toughness yuav tsum tau:
S275J2 yog qhov yuav tsum tau muaj kev cuam tshuam - kuaj ntawm -20 degree, kom ntseeg tau tias kev ua haujlwm hauv qhov khov.
A572 Qib 50 tsis muaj qhov yuav tsum tau muaj kev cuam tshuam tshwj tsis yog hais meej meej nrog cov kev xav tau ntxiv (piv txwv li, A572 Qib 50T rau cov txuas hniav hauv thaj chaw txias).
Kev faib khoom siv:
S275J2 yog cov hlau uas tsis yog- alloy steel nrog lub zog me me, ua kom zoo rau weldability thiab txias- kub toughness.
A572 Qib 50 yog siab- zog qis- hlau alloy (HSLA) steel, feem ntau micro- alloyed nrog niobium / vanadium rau lub zog, tab sis tsis tas yuav tsum tau kho kom haum rau qis- kev pabcuam kub.
Regional Standards:
Cov qhab nia suav nrog cov kev tswj hwm sib txawv (EN vs. ASTM) thiab tau teev tseg raws li cov cai hauv cheeb tsam (Eurocodes vs. AISC/ASCE).
1. S275J2 steel yog dab tsi?
S275J2 yog ib qho uas tsis yog- alloy structural steel qib ib EN 10025-2, nrog rau qhov tsawg kawg nkaus lub zog ntawm 275 MPa thiab lav qhov cuam tshuam toughness ntawm -20℃.
2. Qhov 'J2' hauv S275J2 txhais li cas?
Lub 'J2' qhia tias Charpy V- qhov ntsuas qhov cuam tshuam ntawm -20 degree, ua kom lub zog nqus tsawg kawg nkaus ntawm 27 Joules siv rau hauv qhov chaw txias.
3. Cov ntawv thov tseem ceeb ntawm S275J2 yog dab tsi?
Nws yog siv rau hauv cov khoom siv uas raug rau cov huab cua txias, xws li txuas hniav, offshore platforms, xa cov yees, thiab cov tsev lag luam hauv cheeb tsam uas muaj lub caij ntuj no hnyav.
4. Qhov txawv ntawm S275JR thiab S275J2 yog dab tsi?
S275JR raug kuaj xyuas ntawm +20 degree, thaum S275J2 raug kuaj ntawm -20 degree, ua J2 haum rau cov ntawv thov qhov kub thiab txias hauv qab khov.
5. Lub zog tawm ntawm S275J2 yog dab tsi?
Qhov tsawg kawg nkaus yield zog yog 275 MPa rau thicknesses txog li 16 hli, nrog txo qhov tseem ceeb rau thicker seem raws li tus qauv.
6. S275J2 puas tuaj yeem welded?
Yog lawm, S275J2 muaj weldability zoo. Txawm li cas los xij, cov txheej txheem tsim nyog- suav nrog kev ua kom muaj peev xwm ua ntej thiab siv cov khoom siv hlau tsim nyog- yog qhov tseem ceeb, tshwj xeeb tshaj yog rau cov ntu tuab lossis vuam hauv qhov txias.
7. Cov tshuaj muaj pes tsawg leeg ntawm S275J2 yog dab tsi?
Nws feem ntau muaj max 0.20% Carbon, max 1.50% Manganese, thiab tswj qib ntawm phosphorus thiab sulfur (piv txwv li, P Tsawg dua lossis sib npaug li 0.035%, S Tsawg dua lossis sib npaug li 0.035%).
8. Puas yog S275J2 sib npaug rau ASTM A572 Qib 50?
Tsis yog, S275J2 muaj lub zog qis dua (275 MPa vs . 345 MPa) thiab suav nrog qhov yuav tsum tau ntsuas -20℃cuam tshuam, thaum A572 Qib 50 feem ntau tsis muaj qhov yuav tsum tau ua kom muaj zog.
9. Qhov txawv ntawm S275J2 thiab S355J2 yog dab tsi?
S355J2 muaj qhov tsawg dua qhov ua tau zoo dua (355 MPa) tab sis zoo sib xws cuam tshuam rau qhov hnyav ntawm -20 degree, ua rau nws muaj zog rau kev siv huab cua txias.
10. Puas yog S275J2 corrosion resistant?
Tsis yog, S275J2 tsis yog corrosion-resistant. Zoo li lwm yam carbon steels, nws yuav tsum tau tiv thaiv txheej xws li pleev xim los yog galvanizing rau sab nraum zoov siv.
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.
