Tshuaj muaj pes tsawg leeg:
Qhov tseem ceeb ntawm qhov tsawg -Carbon Design
Cov tshuaj muaj pes tsawg leeg ntawm S275JR nruj me ntsis ua raws li EN 10025-2 tus qauv. Nws cov yam ntxwv tseem ceeb yog cov ntsiab lus tsis tshua muaj carbon thiab optimized element ratios:
Carbon (C): Cov ntsiab lus tswj tsawg dua lossis sib npaug li 0.21%. Qhov qis- cov yam ntxwv carbon no ua rau muaj txiaj ntsig zoo ntawm cov khoom siv weldability thiab tsis txhob ua kom tawv tawv hauv cov tshav kub- thaj tsam cuam tshuam. Qhov kev tsim no ua rau nws tsim tshwj xeeb rau kev tsim cov qauv hlau uas xav tau kev ua haujlwm vuam dav.
Manganese (Mn): Cov ntsiab lus muaj tsawg dua lossis sib npaug li 1.50%. Raws li ib tug deoxidizer thiab ntxiv dag zog rau lub cev, manganese zoo refines nplej thiab txhim kho lub zog thaum tuav zoo toughness.
Phosphorus (P) thiab Sulfur (S): Txwv kom tsawg dua lossis sib npaug li 0.045% thiab Tsawg dua lossis sib npaug rau 0.045% (JR qib), feem. Cov ntsiab lus tsis muaj impurity tsawg ua kom cov khoom tsis kam ua kom tawg tawg. Qhov tseem ceeb, qib siab dua li S275JO / S275J2 muaj kev tswj hwm nruj dua li cov sulfur thiab phosphorus (tsawg dua lossis sib npaug li 0.035%).
Silicon (Si): Feem ntau Tsawg dua lossis sib npaug li 0.40%. Ntxiv ua deoxidizer; Cov nyiaj ntau dhau txo cov plasticity, yog li kev tswj hwm yog tsim nyog.
Mechanical Properties:
Daim duab ntawm Balancing Strength thiab Toughness
Raws li tus qauv xav tau, S275JR yuav tsum ua kom tau raws li cov cuab yeej cuab tam hauv qab no:
Yield Strength: Ntau dua los yog sib npaug rau 275 MPa (thickness Tsawg dua lossis sib npaug li 16mm), txo qis me ntsis nrog nce thickness (xws li, 265 MPa rau 16-40mm). Qib no lub zog ua rau nws haum rau nruab nrab-load lug.
Tensile Strength: 410-560 MPa, ntau yam muab kev yooj yim hauv kev ua thiab kev tsim.
Elongation: Ntau dua los yog sib npaug li 23% (thickness 3-16mm), zoo heev plasticity tso cai rau nws tiv taus txias dabtsi yog khoov, stamping, thiab lwm yam kev ua.
Impact Toughness: JR qib yuav tsum muaj 27J cuam tshuam lub zog (20 degree), thaum JO / J2 qib yuav tsum tau qis-kub toughness ntawm -20℃thiab -30℃feem. Cov qauv tsim qib no ua tau raws li qhov xav tau ntawm ib puag ncig sib txawv.
Ntawm qhov kev ceeb toom tshwj xeeb yog qhov sib piv ntawm lub zog (yield zog / tensile zog) ntawm S275JR, uas yog kwv yees li 0.6-0.7. Tus nqi no ua kom muaj kev nyab xeeb ntawm cov qauv thaum tso cai rau cov npoo txaus rau cov yas deformation, ua kom pom qhov zoo tshaj plaws hauv kev tsim vaj tsev hauv thaj chaw av qeeg.
Cov yam ntxwv txheej txheem:
Adaptable rau tag nrho cov txheej txheem los ntawm Smelting mus ua
1. Smelting txheej txheem: Niaj hnub nimno steel mills feem ntau ntiav converter smelting + ladle refining (LF rauv) txheej txheem. Lub tshuab nqus tsev degassing tswj cov ntsiab lus roj, kom ntseeg tau tias [H] Tsawg dua lossis sib npaug rau 2ppm thiab [O] Tsawg dua lossis sib npaug rau 30ppm, txhim kho cov khoom siv purity los ntawm qhov chaw.
2. Kub Rolling Control: Qhov kawg dov kub yog feem ntau tswj tsis pub dhau 850-880℃ntau. TMCP (Lub Sijhawm Sijhawm Sijhawm thiab Txias Txheej Txheem) thev naus laus zis ua kom cov nplej ferrite, ua tiav qhov ntsuas qhov loj ntawm ASTM 7-8.
3. Welding Adaptability: Carbon sib npaug Ceq (IIW) Tsawg dua los yog sib npaug rau 0.36%, txias cracking rhiab heev Performance index Pcm Tsawg dua los yog sib npaug rau 0.22%, uas txhais tau tias:
- Tsis xav tau preheating (phaj thickness Tsawg dua los yog sib npaug li 20mm)
- Haum rau ntau yam txheej txheem xws li phau ntawv arc vuam, submerged arc vuam, thiab roj shielded vuam
- Tom qab-weld kev kho cua sov tsis tas yuav tsum tau (tshwj tsis yog cov phaj tuab tshwj xeeb)
Qhov chaw thov:
Los ntawm Traditional Infrastructure mus rau Emerging Fields
1. Lub Tsev Steel Structures: Cov nyiaj rau kwv yees li 45%, tshwj xeeb tshaj yog tsim rau loj -span industrial nroj tsuag.
2. Choj Engineering: Feem ntau yog siv rau cov neeg taug kev txuas hniav thiab tsis yog - qhov tseem ceeb thauj khoom - cov kabmob.
3. Machinery Manufacturing: Tsis yog- qhov tseem ceeb load-cov kabmob xws li booms thiab outriggers ntawm engineering machinery.
4. Cov ntawv thov tshiab: Cov kev xav tau tseem ceeb hauv kev lag luam photovoltaic bracket nyob rau hauv xyoo tas los no, vim nws cov huab cua zoo dua piv rau cov pa roj carbon zoo tib yam.
S275JR SHS Tube Hoobkas
