Q550Dyog qib siab -lub zog qis- alloy structural steel qib, teev nyob rau hauv Suav teb tus qauv GB/T 16270-2009 (Steel Palates for High Strength Structures with Improved Toughness). Nws sawv cev rau qib siab dua nyob rau hauv "Q" series ntawm cov qauv hlau.
Nov yog cov ncauj lus kom ntxaws txog qhov Q550D txhais li cas:
1. Qib Qib Kev Ntsuas
Lub npe ua raws tib lub ntsiab lus raws li lwm qib hauv cov koob (xws li Q500D thiab Q460D):
Q: Sawv rau Yield Strength (Qu Fu Qiang Du).
550: Qhia qhov tsawg kawg nkaus yield zog yog 550 MPa (Megapascals) rau thicknesses tsawg dua los yog sib npaug rau 16 hli.
D: Sawv cev rau qib zoo ntsig txog kev cuam tshuam toughness. Tshwj xeeb, D txhais tau hais tias cov hlau tau lees paub tias muaj qhov tsawg kawg nkaus Charpy V-qhov cuam tshuam lub zog ntawm qhov ntsuas kub ntawm -20℃.
2. Cov cuab yeej cuab tam tseem ceeb
Yield Strength (ReH): Ntau dua lossis sib npaug li 550 MPa
Tensile Strength (Rm): Feem ntau nyob rau hauv thaj tsam ntawm 670 - 830 MPa
Elongation (A): Yam tsawg kawg nkaus tus nqi teev (piv txwv li, Ntau dua lossis sib npaug li 16% lossis 17%, nyob ntawm qhov tuab), kom ntseeg tau zoo ductility.
Impact Toughness (KV₂): Kuaj ntawm -20 degree, nrog rau lub zog yam tsawg kawg nkaus (feem ntau Ntau dua lossis sib npaug rau 34 Joules). Qhov no ua kom cov hlau tiv taus cov pob txha tawg hauv qhov chaw txias los yog nyob rau hauv kev thauj khoom dynamic.
3. Chemical Composition & Metallurgy
Yuav kom ua tiav lub zog siab no -toughness ua ke, Q550D nta ua tib zoo tswj, micro-alloyed muaj pes tsawg leeg:
Cov ntsiab lus carbon tsawg: Sib npaug lub zog nrog weldability.
Micro-Alloying Elements: Ntxiv ntawm Niobium (Nb), Vanadium (V), thiab/los yog Titanium (Ti) rau cov nplej ua kom zoo thiab nag lossis daus.
Manganese (Mn): Ib qho tseem ceeb ntxiv dag zog.
Tsis tshua muaj impurities: nruj kev txwv ntawm Sulfur (S) thiab Phosphorus (P) kom ntseeg tau tias muaj zog thiab vuam zoo.
Muaj Peev Xwm Ntxiv: Tej zaum yuav suav nrog me me ntawm Nickel (Ni) lossis Chromium (Cr) txhawm rau txhim kho hardenability thiab toughness.
Nws cov microstructure feem ntau ua tiav los ntawm Thermo-Mechanical Controlled Processing (TMCP) los yog quenching thiab tempering (Q&T), uas ua rau ib tug nplua -grained bainitic los yog martensitic qauv.
4. Qhov zoo tshaj plaws & yam ntxwv
Lub zog siab heev-rau- Qhov hnyav piv: Ua kom muaj qhov hnyav hnyav hauv cov qauv.
Zoo Tsawg-Tsub Toughness: Haum rau siv nyob rau hauv cov huab cua txias (txog -20℃kev pab cuam).
Fatigue Resistance: Kev ua tau zoo nyob rau hauv cyclic loading.
Weldability: Nws yog weldable, tab sis vim nws lub zog ntau dua thiab cov pa sib npaug (CEV) piv rau qib zoo li Q460D, nws xav tau cov txheej txheem vuam nruj. Qhov no suav nrog preheating kom raug, tswj cov cua sov, thiab kev siv tshwj xeeb sib tw siab - zog vuam consumables kom tsis txhob txias cracking thiab khaws cia sib koom ua ke toughness.
5. Daim ntawv thov tseem ceeb
Q550D yog siv rau hauv cov kev xav tau tshaj plaws ntawm cov qauv siv uas txo qhov hnyav thiab ua kom lub zog loj tshaj plaws los yog ncua yog qhov tseem ceeb:
Ultra-High-Rise Building Cores & Mega-Kem
Cov Cheebtsam tseem ceeb ntawm Loj -Span Bridges (xws li, arches, box girders rau hnyav loads)
Hnyav-Lub Luag Haujlwm Mobile Crane Booms thiab Chassis
Offshore Platform Jackets thiab Hnyav-Lift Decks
Siab -Pressure Penstocks thiab Hydraulic Structures
Tshwj xeeb tsuas yog cov khoom siv thauj khoom thiab thauj khoom
Sib piv nrog Cov Qib Zoo sib xws
Vs. Q460D / Q500D: Q550D muab cov kauj ruam tom ntej ntawm lub zog (550 MPa vs . 460/500 MPa). Qhov no los nrog kev lag luam tawm -tawm: nws tsis tshua zam txim rau vuam thiab fabricate dua Q460D thiab muaj qhov qis dua me ntsis elongation (ductility).
Vs. Cov Qib Thoob Ntiaj Teb: Nws yog qhov dav sib piv rau cov qib European xws li S550QL / S550QL1 (EN 10025-6) lossis Asmeskas qib zoo li ASTM A514 Qib 100 hais txog lub zog thiab daim ntawv thov, txawm tias qhov sib npaug ncaj qha yuav tsum tau kuaj xyuas cov ncauj lus kom ntxaws.
Cov ntsiab lus
Q550D yog Suav tus qauv, siab - lub zog steel phaj nrog qhov tsawg kawg nkaus lub zog ntawm 550 MPa thiab lav qhov cuam tshuam toughness ntawm -20℃. Nws yog cov khoom siv zoo tshaj plaws uas tau xaiv rau cov haujlwm siab tshaj plaws thiab qhov hnyav-qhov tseem ceeb ntawm engineering, qhov twg nws lub zog zoo tshaj plaws ua rau cov kev xav tau ntau dua thiab raug nqi tsim khoom.