Q460Dyog ib qho microalloyed siab -lub zog steel qauv txhais los ntawm Tuam Tshoj tusGB/T 1591-2018txheem. Raws li qhov kev xaiv sib npaug ntawm qhov dav dav -lub hom phiaj qis- lub zog steel thiab ultra- siab- qib zog, nws sawv tawm rau nws cov khoom siv kho tshuab txhim khu kev qha, tus nqi nruab nrab, thiab kev hloov mus rau qhov ua haujlwm txias txias. Tsis zoo li European qauv steels xws li S500Q / S500QL, Q460D yog haum rau cov khoom yuav tsum tau ntawm domestic engineering tej yaam num, ua rau nws ib tug staple nyob rau hauv Tuam Tshoj txoj kev tsim kho, machinery, thiab infrastructure sectors.
Qib Nomenclature & Core Design Logic
Lub npe Q460D muaj qhov cuam tshuam txog kev cuam tshuam uas cuam tshuam txog nws txoj kev ua haujlwm:
- Q: Abbreviation forQuxiangqiangdu(yield zog) nyob rau hauv Suav, cim nws raws li ib tug yield zog- raws li cov qauv hlau.
- 460: Yam tsawg kawg nkaus yield zog ntawm 460 MPa rau daim hlau nrog thickness Tsawg dua los yog sib npaug rau 16 hli, ib tug tseem ceeb metric uas ua kom cov hlau yuav ris hnyav loads yam tsis muaj yas deformation.
- D: Tus txheeb xyuas qib zoo, qhia tias cov hlau yuav tsum xeem dhau Charpy V-qhov ntsuas qhov cuam tshuam ntawm-20 degreenrog rau qhov tsawg kawg nkaus lub zog ntawm 34 J (longitudinal direction). Qhov no txawv ntawm cov qib qis: Q460A (tsis muaj qhov yuav tsum tau muaj), Q460B (20℃cuam tshuam), thiab Q460C (0℃cuam tshuam), nrog rau qhov txias dua -qib Q460E (-40℃cuam tshuam).
Tus qauv tsim ntawm Q460D tsom raulub zog- toughness balancees tsis mus nrhiav kev ua tau zoo heev. Nws siv kev sib xyaw ua ke ntawm qis-carbon cov ntsiab lus thiab microalloying (Nb, V, Ti) kom ua tiav cov nag lossis daus ntxiv thiab cov nplej ua kom zoo, zam cov teeb meem brittleness uas plague siab - carbon siab - lub zog steels.
Chemical Composition & Microstructural yam ntxwv
Q460D's chemical formula yog optimized rau kev ua tau zoo thiab kev ua haujlwm ntawm thaj chaw, nrog rau kev txwv nruj ntawm cov khoom tsis zoo:
| Element | Cov ntsiab lus ntau yam (wt%, Max / Min) | Core Function |
|---|---|---|
| Cov pa roj carbon (C) | Tsawg dua los yog sib npaug li 0.20 | Xyuas kom weldability thiab tsis txhob grain coarsening |
| Manganese (Mn) | Tsawg dua lossis sib npaug li 1.70 | Khoom- daws teeb meem; txhim kho toughness |
| Phosphorus (P) | Tsawg dua lossis sib npaug li 0.030 | Txwv kom tsis txhob qis -kub embrittlement |
| Sulfur (S) | Tsawg dua lossis sib npaug li 0.025 | Tswj tau kom txo tau kub cracking txaus ntshai thaum dov |
| Niobium (Nb) | Tsawg dua los yog sib npaug li 0.07 | grain refinement; nag lossis daus reinforcing |
| Vanadium (V) | Tsawg dua los yog sib npaug li 0.20 | Txhim kho yield zog yam tsis muaj kev txi ductility |
| Aluminium (Al) | Ntau dua lossis sib npaug rau 0.015 | Deoxidizer; refines ferrite nplej |
Nws microstructure yog feem ntauferrite-pearlite nrog dispersed microalloy precipitates. Cov qauv no muab lub zog muaj zog, zoo ductility, thiab ruaj khov cuam tshuam toughness ntawm -20 degree, ua rau nws haum rau ob qho tib si zoo li qub thiab dynamic load-bearing Cheebtsam.
Mechanical Properties: Thickness -Nyob ntawm kev ua tau zoo
Q460D's mechanical zog poob qis me ntsis nrog nce phaj thickness, ib qho zoo tshwm sim los ntawm kev txo hardenability nyob rau hauv thicker seem. Cov lus hauv qab no teev cov kev xav tau yam tsawg kawg nkaus rau GB / T 1591-2018:
| Thickness ntau (mm) | Min Yield zog (MPa) | Tensile zog (MPa) | Min Elongation (%) | Min Impact Zog (-20 degree, J) |
|---|---|---|---|---|
| Tsawg dua los yog sib npaug li 16 | 460 | 550–720 | 17 | 34 (ntev) |
| 16–40 | 440 | 550–720 | 17 | 34 (ntev) |
| 40–63 | 420 | 550–720 | 16 | 34 (ntev) |
| 63–100 | 400 | 550–720 | 16 | 34 (ntev) |
| 100–150 | 380 | 550–720 | 16 | 34 (ntev) |
Qhov tseem ceeb, Q460D kuj txhawb nqaZ-kev taw qhia kev ua tau zoo(Z15 / Z25 / Z35 qib). Qhov no yog qhov tseem ceeb rau cov phaj tuab siv hauv vuam- cov qauv hnyav, vim nws tiv thaiv lamellar tearing hauv qab los ntawm - thickness tensile stress.
Qhov Zoo Tshaj Plaws & Daim Ntawv Thov Ciam Teb
Core Zoo
Tus nqi -kev ua tau zoo: Muab piv rau cov khoom siv siab- zog steels (piv txwv li, S500Q), Q460D muaj kev sib piv lub zog ntawm tus nqi qis dua 15-25%, ua rau nws zoo tagnrho rau cov haujlwm loj hauv tsev -.
Weldability zoo heev: Nrog rau qhov sib npaug ntawm cov pa roj carbon tsawg (CEV Tsawg dua lossis sib npaug li 0.48%), nws tuaj yeem welded siv cov txheej txheem txheej txheem (MIG, MAG, SMAW) yam tsis muaj kev ua kom sov ua ntej rau nyias - mus rau - cov phaj nruab nrab (tsawg dua lossis sib npaug li 40 hli).
Cov txheej txheem dav dav adaptability: Nws txhawb kev kub sib sau, txias khoov, thiab machining. Kub sib sau ntawm 800-950℃ua kom zoo zoo, thaum lub caij txias yog ua tau rau nruab nrab deformation (tsawg dua los yog sib npaug rau 10% strain).
Daim ntawv thov ciam teb
q460d yogtsis haumrau ultra-qis- qhov kub thiab txias (hauv qab -20 degree) lossis siab- cov xwm txheej corrosion (xws li, offshore tob- cov khoom siv dej hiav txwv). Rau cov rooj plaub no, Q460E lossis corrosion-resistant alloy steels yuav tsum tau xaiv hloov.
Tej kev siv
Kev tsim kho: Steel kem/beams rau siab-cov tsev nce siab, lub ntsiab girders rau txoj kev loj choj nyob rau hauv temperate/mob txias.
Engineering tshuab: Crane booms, excavator chassis, mining tsheb thav duab (siv nyob rau hauv qhov chaw uas lub caij ntuj no kub tsis poob qis dua -20 degree).
Infrastructure: Kev them nyiaj yug cov qauv rau cua turbine yees, steel ncej rau chaw ntau pob thiab tshav dav hlau.
Cov cuab yeej tshwj xeeb: Tsawg- kub cia tank plhaub (ua hauj lwm kub siab tshaj los yog sib npaug rau -20 degree), siab hlab ntsha auxiliary Cheebtsam.
Qib sib npaug rau Hla-Txoj Haujlwm Ciam Teb
Rau cov haujlwm uas yuav tsum tau hloov cov khoom siv ntawm Suav thiab thoob ntiaj teb cov qauv, Q460D muaj qhov sib npaug hauv qab no:
European Standard: Ze rau S460MC (EN 10149-2) - Zoo sib xws yield zog, tab sis sib txawv qhov ntsuas kub.
American Standard: Muab piv rau ASTM A572 Qib 65 - qib sib piv, nrog qhov sib txawv me ntsis ntawm cov tshuaj muaj pes tsawg leeg.
Kev xaiv hauv tsev: Q460C (rau thaj chaw sov) lossis Q460E (rau thaj chaw txias dua, Tsawg dua lossis sib npaug rau -40℃).
Q460D puas tuaj yeem siv los hloov S500Q hauv qhov project choj nyob hauv nruab nrab Tuam Tshoj (lub caij ntuj no kub ntau dua lossis sib npaug rau -10 degree)?
Yog, nws ua tau. Central Tuam Tshoj lub caij ntuj no kub zoo tshaj Q460D's -20℃cuam tshuam qhov pib. Q460D lub zog tawm los (Ntau dua lossis sib npaug rau 420MPa rau 40-63mm daim hlau) yog txaus rau cov kev cai choj thauj khoom, thiab nws muaj tus nqi tseem ceeb tshaj S500Q. Xyuas kom meej tias cov txheej txheem vuam ua raws li GB / T 1591 tus qauv kom muaj kev sib koom ua ke.
Peb tab tom khoov 20 hli - tuab Q460D daim hlau rau hauv crane boom Cheebtsam. Peb yuav tsum ceev faj dab tsi kom tsis txhob tawg?
Rau txias khoov ntawm 20mm Q460D daim hlau, ob kauj ruam yog qhov tseem ceeb. Ua ntej, tswj lub vojvoog dabtsi yog khoov: nws yuav tsum yog tsawg kawg 3 zaug ntawm lub phaj tuab kom tiv thaiv kev ntxhov siab ntawm qhov khoov. Qhov thib ob, tsis txhob khoov ntawm qhov kub thiab txias hauv qab 0 degree, vim qhov no tuaj yeem txo cov ductility thiab ua rau tawg. Yog tias khoov rau lub caij ntuj no, preheat lub phaj rau 20-50℃ua ntej sib sau.
Qhov kev pabcuam kub siab tshaj plaws rau Q460D yog dab tsi? Nws puas yuav mos ntawm qhov kub thiab txias?
Q460D yog tsim los rau ambient thiab qis -kev pabcuam kub. Nws lub zog pib poob qis thaum raug kub siab tshaj 300℃rau ncua sij hawm. Ntawm 400 degree, nws lub zog yield poob mus txog 60% ntawm chav tsev-kub tus nqi, ua rau nws tsis haum rau siab -kev siv kub (xws li, nyob ze ntawm cov chaw ua khoom siv hluav taws xob). Rau cov xwm txheej zoo li no, cov cua sov- cov hlau tsis zoo li Q345R yuav tsum tau siv.
Yuav ua li cas txhawm rau txhim kho corrosion ntawm Q460D thaum siv nyob rau sab nraum zoov?
Q460D tsis yog stainless hlau, yog li kev tiv thaiv saum npoo yog qhov tseem ceeb. Rau kev siv sab nraum zoov, siv ob- txheej txheej txheej: epoxy zinc- nplua nuj primer (qhuav zaj duab xis tuab Ntau dua lossis sib npaug li 80μm) + polyurethane topcoat (Ntau dua lossis sib npaug rau 60μm). Rau cov ntug hiav txwv dej los yog qhov chaw ntub dej, kub -dip galvanizing (txheej thickness Ntau dua los yog sib npaug rau 85μm) yog qhov kev xaiv zoo dua, vim nws muab kev tiv thaiv corrosion ntev ntev txog 20 xyoo nrog kev saib xyuas tsawg.