Qhov kev ua tau zoo sib txawv ntawm Q390D thiab Q355D yog qhov tseem ceeb thiab hais kom lawv siv hauv kev siv engineering. Ob leeg yog qis- alloy siab- lub zog cov qauv hlau nrog qhov zoo qis- qhov kub thiab txias, tab sis Q390D yog qib siab dua - cov khoom siv qib.
Nov yog cov ncauj lus kom ntxaws txog lawv qhov kev sib txawv ntawm qhov tseem ceeb:
1. Core Mechanical Property: Lub zog
Qhov no yog qhov sib txawv tseem ceeb tshaj plaws.
Q355D: Lub "355" qhia txog qhov tsawg kawg nkaus tawm lub zog ntawm 355 MPa (Megapascals) ntawm lub thickness ntawm ≤16mm. Nws lub zog tensile yog li ntawm 470-630 MPa.
Q390D: Lub "390" qhia txog qhov siab tshaj qhov ua tau zoo ntawm 390 MPa ntawm tib lub thickness. Nws lub zog tensile yog li ntawm 490-650 MPa.
Kev cuam tshuam: Q390D tuaj yeem tiv taus kwv yees li 10% siab dua ua ntej pib deformation mus tas li. Qhov no tso cai rau cov seem thinner thiab cov qauv sib zog nyob rau hauv tib lub load, los yog siab dua load-cov kabmob muaj peev xwm nrog tib seem loj.
2. Tshuaj muaj pes tsawg leeg & Alloying
Txhawm rau ua tiav nws lub zog siab dua, Q390D muaj cov tshuaj pleev xim sib txawv me ntsis piv rau Q355D:
Higher Carbon Equivalent (Ceq): Q390D feem ntau muaj cov pa roj carbon ntau (C), manganese (Mn), thiab lwm yam ntxiv dag zog xws li niobium (Nb), vanadium (V), thiab titanium (Ti). Qhov no nce nws cov nqi sib npaug carbon, yog ib qho tseem ceeb rau weldability.
Ntau Alloying Elements: Kev siv meej ntawm micro-alloying ntsiab yog optimized nyob rau hauv Q390D kom ua tiav lub zog nce los ntawm grain refinement thiab nag lossis daus hardening.
Qhov cuam tshuam: Ceq siab dua ua Q390D me ntsis nyuaj rau vuam. Nws yuav tsum muaj kev tswj xyuas nruj dua ntawm cov txheej txheem vuam (ua ntej- cua sov / inter- dhau qhov kub, qhov hluav taws xob hluav taws xob, kev xaiv electrode) kom tsis txhob muaj qhov txias txias thiab tswj cov khoom siv hluav taws xob hauv tshav kub- thaj chaw cuam tshuam (HAZ).
3. Tsawg-Tsuas Kub Ua Tau Zoo ("D" Qib)
Ob lub steels sib koom "D" qib, uas txhais tau hais tias lawv cov kev cuam tshuam toughness raug kuaj ntawm -20 ° C. Lawv yuav tsum ua kom tau raws li qhov xav tau ntawm lub zog tsawg kawg nkaus (≥34 Joules) ntawm qhov kub thiab txias.
Cov ntsiab lus tseem ceeb: Tsis muaj qhov sib txawv ntawm lawv cov ntawv pov thawj qis -kub toughness. Ob leeg yog tsim los rau cov ntawv thov nyob rau hauv qhov chaw txias qhov chaw tiv thaiv kev tawg tawg yog qhov tseem ceeb (xws li, cov qauv sab nraum zoov nyob rau sab qaum teb huab cua, cua turbine yees, kev txhawb nqa rau cov tub yees warehouses).
4. Tus Nqi & Kev Lag Luam Kev Lag Luam
Cov Khoom Siv Nqi: Q390D kim dua ib tuj dua Q355D vim nws cov ntsiab lus alloy siab dua thiab kev tswj hwm ntau lawm.
Tag Nrho Cov Nqi Them Nqi (Value Engineering): Lub zog siab dua ntawm Q390D tuaj yeem ua rau cov khoom txuag (tsawg tonnage xav tau) thiab cov qauv sib dua (txo cov loads ntawm lub hauv paus thiab ua kom yooj yim rau kev thauj mus los / erection). Yog li ntawd, nyob rau hauv daim ntawv thov qhov hnyav los yog seem me me yog qhov tseem ceeb txwv, siv Q390D tuaj yeem ua tau zoo dua kev lag luam tag nrho, txawm tias nws cov nqi siab dua.
5. Daim ntawv thov Scenarios
Qhov kev xaiv nyob ntawm qhov xav tau tsim:
Q355D: Lub workhorse rau dav dav -lub zog siv cov qauv siv. Siv dav hauv:
High-nce thiab super siab-nce vaj tse.
Loj -cov chaw ntau pob thiab chaw ua yeeb yam.
Txuas hniav thiab lwm yam infrastructure.
Cov nroj tsuag muaj zog (qhov twg yuav tsum muaj zog raws li Q355).
Q390D: Siv rau cov ntawv thov ntau dua qhov muaj zog dua - rau - qhov hnyav piv yog qhov tseem ceeb lossis qhov chaw thauj khoom siab heev. Cov kev siv ib txwm muaj xws li:
Cov khoom tseem ceeb-cov khoom muaj nyob hauv ultra- siab- cov tsev nce siab (piv txwv li, mega-kem).
Hnyav-cov haujlwm crane girders thiab cov qauv kev txhawb nqa hauv cov mills.
Loj - ncua cov qauv uas txo tus kheej - hnyav ntawm cov hlau yog qhov tseem ceeb rau kev ua haujlwm.
Tej yam tshwj xeeb ntawm ntug dej hiav txwv thiab marine lug.
Cov khoom siv thauj mus los uas qhov kev txuag hnyav yog qhov tseem ceeb.
Cov lus xaus
| Feature | Q355D | Q390D | Qhov zoo |
|---|---|---|---|
| Yield zog | ≥355 MPa | ≥390 MPa | Q390D (Ntau dua Load Capacity) |
| Tensile zog | 470-630 MPa | 490-650 MPa | Q390D (Muaj siab dua) |
| Tsawg-Temp Toughness | Zoo heev (-20 ° C) | Zoo heev (-20 ° C) | Sib npaug |
| Weldability | Zoo heev | Zoo (tab sis xav tau kev saib xyuas ntau dua) | Q355D (Yooj yim rau vuam) |
| Alloy Cov ntsiab lus / Ceq | qis | Siab dua | - |
| Tus nqi khoom siv | qis | Siab dua | Q355D |
| Tsim Efficiency | Zoo | Zoo dua (Lighter Sections) | Q390D rau qhov hnyav -tsim qauv tseem ceeb |
Kev xaus rau kev xaiv:
Xaiv Q355D thaum nws lub zog ua tau raws li cov qauv tsim. Nws muaj qhov sib npaug zoo ntawm lub zog, toughness, weldability, thiab tus nqi rau feem ntau ntawm cov qauv siv.
Xaiv Q390D thaum koj xav tau lub zog siab dua yam tsis tau nce phaj tuab, lossis thaum ua kom zoo rau qhov hnyav tsawg yog qhov tseem ceeb tshaj plaws. Qhov kev txiav txim siab yuav tsum suav rau cov txheej txheem vuam me ntsis thiab cov khoom siv ntau dua tus nqi, sib npaug tiv thaiv cov nyiaj khaws cia hauv steel tonnage thiab cov txiaj ntsig cuam tshuam.
Nco ntsoov sab laj cov qauv tsim qauv (xws li GB 50017) thiab ua haujlwm nrog tus kws tsim qauv tsim nyog los ua qhov kev xaiv cov khoom kawg raws li qhov tshwj xeeb ntawm qhov kev suav, ib puag ncig kev pabcuam, thiab kev tsim muaj peev xwm.