Q355B (yav tas los Q345B) yog ib qho ntawm cov qauv siv dav siv hauv Suav teb thiab thoob ntiaj teb. Nws qhov zoo yog los ntawm nws qhov zoo tshaj qhov sib npaug ntawm lub zog, weldability, toughness, thiab nqi -effectiveness, ua rau nws "workhorse" steel rau ntau yam kev siv.
Ntawm no yog ib qho kev piav qhia ntawm nws cov txiaj ntsig tseem ceeb:
1. Optimal Strength-rau-Qhov hnyav piv
Lub zog siab: Nrog qhov tsawg kawg nkaus tawm lub zog ntawm 355 MPa (thiab tensile lub zog ntawm 470-}630 MPa), nws muaj peev xwm ua tau ntau dua -cov kabmob muaj peev xwm tshaj cov hlau qis dua li Q235 (Yield 235 MPa).
Qhov hnyav txo:Qhov no tso cai rau kev tsim cov khoom sib dua thiab ntau dua cov tswv cuab (kab kab, kab) thaum nqa tib lub nra. Qhov no ua rau:
Txo cov khoom tonnage.
Txo cov load ntawm lub hauv paus.
Tsawg nqi tsheb thauj mus los thiab erection.
2. Zoo heev Weldability thiab Formability
Tswj Chemistry:Q355B tau teev cov kev txwv rau Carbon (C), Manganese (Mn), Silicon (Si), thiab cov khoom tsis zoo xws li Phosphorus (P) thiab Sulfur (S). Qhov no ua rau muaj qhov sib npaug Carbon nruab nrab (Ceq), feem ntau nyob ib puag ncig 0.40-0.45%, uas yog qhov zoo rau kev vuam.
Tsawg-Vuam Risk:Nws tuaj yeem welded siv txhua txoj hauv kev (SMAW, GMAW, SAW) yam tsis tas yuav tsum tau preheating rau nyias mus rau nruab nrab thicknesses nyob rau hauv ib txwm tej yam kev mob, simplifying fabrication thiab txo nqi.
Ductility zoo:Nws qhov tsawg kawg nkaus elongation (Ntau dua lossis sib npaug li 21% rau thickness Tsawg dua lossis sib npaug li 16 hli) tso cai rau kev khoov txias thiab ua haujlwm tsis muaj kev tawg.
3. Guaranteed toughness ntawm chav tsev kub
Qib "B" cov lus xaus lav qhov tsawg kawg nkaus Charpy V-qhov cuam tshuam lub zog ntawm 34 Joules ntawm +20℃. Qhov no yog qhov tseem ceeb ntawm kev nyab xeeb zoo dua tsis yog-toughness-guaranteed steels, raws li nws ua kom ntseeg tau:
Resistance rau brittle fracture nyob rau hauv shock loading los yog kev nyuaj siab concentration.
Txhim khu kev ua tau zoo nyob rau hauv feem ntau climatic tej yam kev mob rau kev tsim kho.
Ua raws li cov qauv tsim qauv niaj hnub uas yuav tsum tau ua kom muaj kev ruaj ntseg.
4. Tus nqi -Kev ua tau zoo thiab muaj dav
Tus nqi zoo tshaj:Nws muab tus nqi zoo tshaj plaws - rau - kev ua tau zoo piv rau qhov qis - alloy siab - lub zog steel tsev neeg. Nws muaj zog dua Q235 ntawm tus nqi qis qis, tab sis kev lag luam ntau dua li qib siab dua li Q460 lossis Q690.
Kev tsim khoom loj:Raws li tus qauv qib tsim los ntawm txhua qhov loj steel mills hauv Suav teb thiab thoob ntiaj teb (raws li qhov sib npaug zoo li S355JR), nws tau yooj yim muaj nyob rau hauv txhua hom ntawv (phaj, ntu, raj) thiab qhov ntau thiab tsawg, ua kom lub sijhawm luv luv thiab tus nqi ruaj khov.
5. Kev tsim qauv thiab kev ua raws cai
Harmonized Standard:Q355B raws li GB / T 1591-2018 tau ua tiav nrog cov qib thoob ntiaj teb zoo li Europe's S355JR (EN 10025-2) thiab AsmeskasA572 Gr . 50. Qhov no ua kom yooj yim rau cov haujlwm thoob ntiaj teb thiab kev sib pauv tswv yim.
Universal Txais:Nws tau lees paub meej thiab tau teev tseg hauv txhua lub tsev loj hauv Suav thiab thoob ntiaj teb thiab cov qauv tsim choj (xws li GB 50017, Eurocode 3, AISC), ua rau nws muaj kev nyab xeeb, kev pom zoo xaiv rau cov kws ua haujlwm.
6. Versatility nyob rau hauv daim ntawv thov
Nws cov khoom sib npaug ua rau nws haum rau ntau yam ntawm cov qauv, suav nrog:
Cov Khoom Siv Hauv Tsev:High-nce thav duab, chaw tsim khoom, chaw lag luam.
Cov choj:Girder thiab truss choj.
Heavy Machinery:Crane booms, mining khoom ntas.
Kev thauj mus los:Tsheb chassis, railway wagons.
General Fabrication:Ntauwd, cia racks, txhawb nqa.
Sib piv nrog Cov Qib Neighboring rau Cov Ntsiab Lus
| Qib | Yield zog (Min) | Qhov tseem ceeb zoo vs. Q355B | Hom Siv Case vs. Q355B |
|---|---|---|---|
| Q235B | 235 MPa rau | Tus nqi qis dua, zoo dua formability | Lightly loaded lug, cov tswv cuab theem nrab. |
| Q355B | 355 MPa rau | Qhov Zoo Tshaj Plaws (Lub Zog, Weldability, Nqi, Toughness) | Qhov kev xaiv ua ntej rau cov tswv cuab tseem ceeb hauv feem ntau cov qauv. |
| Q355D | 355 MPa rau | Zoo dua qis-Tsub Toughness (Ib feem ntawm -20 degree) | Cov qauv hauv cov huab cua txias, thaj tsam seismic. |
| Q460C | 460 MPa rau | Lub zog siab dua rau qhov hnyav -tsim qauv tseem ceeb | Ntev- txuas txuas, hnyav- crane nqaj. |
Summary of Advantages
Q355B yog qhov nyiam thiab tseem ceeb ntawm cov qauv hlau vim tias nws muab cov kev daws teeb meem zoo tshaj plaws ntawm tus nqi qis tshaj plaws tag nrho. Nws qhov zoo tsis yog qhov zoo tshaj plaws nyob rau hauv ib pawg (lub zog, toughness, los yog weldability), tab sis nyob rau hauv ua tau zoo heev ntawm tag nrho lawv ib txhij. Qhov no ua rau nws qhov kev ntseeg siab tshaj plaws, kev lag luam, thiab ntau yam kev xaiv rau feem ntau ntawm cov qauv siv, los ntawm skyscrapers mus rau lub Hoobkas hauv pem teb. Nws qhov muaj nyob thoob ntiaj teb thiab kev lees paub cov cai ntxiv rau nws cov xwm txheej raws li tus qauv kev lag luam.