Muab piv Q355D thiab Q345B yog qhov tseem ceeb hauv kev tsim vaj tsev, vim lawv sawv cev rau kev hloov kho qhov tseem ceeb hauv tib chav kawm.
Nov yog cov ncauj lus kom ntxaws txog lawv qhov kev ua tau zoo sib txawv:
1. Core Mechanical Property Differences
| Khoom | Q345B | Q355D | Qhov txawv & Kev cuam tshuam |
|---|---|---|---|
| Yield zog (ReH) | Ntau dua lossis sib npaug li 345 MPa | Ntau dua lossis sib npaug li 355 MPa | Q355D yog ~ 3% muaj zog dua. Qhov no yog qhov me me tab sis ib txwm nce ntxiv, cuam tshuam cov qauv nruj dua. |
| Tensile zog (Rm) | 470 - 630 MPa | 470 - 630 MPa (los yog 490-630 rau qee qhov tshwj xeeb) | Ib yam lossis zoo sib xws. Qhov sib txawv tseem ceeb tsis yog qhov kawg ntawm lub zog. |
| Elongation (A) | Ntau dua lossis sib npaug li 21% (t Tsawg dua lossis sib npaug li 16 hli) | Ntau dua lossis sib npaug li 22% (t Tsawg dua lossis sib npaug li 16 hli) | Q355D muaj me ntsis siab dua ductility, zoo dua rau lub zog nqus. |
| Impact Toughness (KV₂) | Kuaj ntawm Chav Temp (+20 degree) Min. zog Ntau dua los yog sib npaug rau 34J |
Kuaj ntawm -20 degree Min. zog Ntau dua los yog sib npaug rau 34J |
LUB SIJ HAWM Different. Q355D lav kev ua tau zoo nyob rau hauv txias / dynamic tej yam kev mob. |
2. Qhov sib txawv ntawm qhov sib txawv: Tsawg-Temperature Toughness ("D" vs. "B" Qib)
Qhov no yog thawj qhov laj thawj rau xaiv Q355D dhau Q345B.
Q345B ("B" Qib):Kev ntsuas cuam tshuam yog ua ntawm +20℃. Nws tsim nyog rau cov qauv dav dav hauv ambient, tsis yog - kub hloov pauv.
Q355D ("D" Qib):Kev ntsuas cuam tshuam yog ua ntawm -20 degree. Nws yog engineered rau:
Cov qauv hauv cov huab cua txias (xws li, Northern China, Europe, Canada).
Dynamically loaded lug (piv txwv li, txuas hniav, crane girders, cua turbine yees) qhov twg muaj kev ntxhov siab ntau thiab siab strain tus nqi yuav ua rau nkig puas tus cwj pwm txawm nyob rau hauv nruab nrab kub.
Cov nodes tseem ceeb uas qhov kev ua tsis tiav yog qhov hnyav.
3. Tshuaj muaj pes tsawg leeg & Weldability
Chemical Control:Txhawm rau ua kom tau raws li -20℃toughness, Q355D muaj kev txwv nruj dua ntawm impurities (Phosphorus, Sulfur) thiab feem ntau yuav tsum tau ua kom zoo nplej (ntawm micro-alloying nrog Nb, V, los yog Al kho). Qhov no ua rau kom huv, ntau hom hlau.
Weldability:Vim nws cov tshuaj tswj tau zoo dua, Q355D feem ntau muaj qhov zoo dua weldability. Nws tsis tshua muaj cua sov- thaj tsam cuam tshuam (HAZ) tawg, tshwj xeeb tshaj yog nyob rau hauv cov ntu tuab thiab nyob rau hauv kev txwv. Txawm li cas los xij, ob qib yuav tsum muaj cov txheej txheem tsim nyog; cov npoo ntawm qhov yuam kev tsuas yog dav dua nrog Q355D.
4. Daim Ntawv Thov & Cov Txheej Txheem Kev Xaiv
Kev xaiv yog tsav los ntawm ib puag ncig, hom thauj khoom, thiab cov cai yuav tsum tau ua.
| Daim ntawv thov Scenario | Pom zoo xaiv | Kev xav |
|---|---|---|
| General tsev thav duab nyob rau hauv temperate climates nrog static loads. | Q345B | Tus nqi - zoo thiab txaus txaus. Qib "D" toughness yog qhov tsis tsim nyog. |
| Cov choj, tshwj xeeb tshaj yog nyob rau hauv cheeb tsam txias los yog muaj tsheb thauj mus los hnyav. | Q355D (feem ntau yuav tsum tau) | Dynamic loads + txias txias yuav tsum tau lav tsawg-kub toughness. |
| Cua Turbine Towers. | Q355D (Industry Standard) | Ua raws li huab cua loj heev thiab yuav tsum ua haujlwm hauv sub-zero kub. |
| Heavy industrial cog nrog nruab nrab dynamic loading. | Q345B los yog Q355D | Nyob ntawm seb qhov kev qaug zog thiab qhov kub thiab txias ntawm qhov project. |
| Critical welded nodes nyob rau hauv ib qho tseem ceeb qauv. | Q355D | Nws zoo dua weldability thiab toughness muab ib qho kev nyab xeeb ntxiv los tiv thaiv tawg tawg. |
5. Nqi & Muaj
Tus nqi:Q355D nqa tus nqi nruab nrab (feem ntau 5-15%) dhau Q345B vim muaj kev tswj hwm ntau lawm.
Muaj:Ob leeg yog dav tsim nyob rau hauv Suav teb. Q345B yog classic "workhorse," thaum Q355D yog qhov niaj hnub, siab dua -kev ua tau zoo dua rau cov ntawv thov.
Summary : Table Comparison Performance
| Yam | Yeej / Qhov txawv | Txiav txim |
|---|---|---|
| Static Strength | Q355D (Qhov zoo dua me ntsis) | Marginally ntau yield zog. Tsis yog qhov laj thawj tseem ceeb rau kev xaiv. |
| Ductility | Q355D (Qhov zoo dua me ntsis) | Me ntsis siab dua yuav tsum tau elongation. |
| Tsawg-Temp Toughness | Q355D (Qhov zoo tshaj plaws) | Qhov tseem ceeb sib txawv. Qhov tseem ceeb rau kev pabcuam txias / dynamic. |
| Weldability & Internal Quality | Q355D | Cov hlau huv huv nrog cov nplej zoo dua, ua rau cov pob qij txha txhim khu kev qha. |
| Tus nqi -Kev ua tau zoo rau kev siv dav | Q345B | Tseem yog qhov kev xaiv pheej yig tshaj plaws uas qhov tawv tawv tsis yog qhov tseem ceeb. |
| Ua raws li Cov Cai Niaj Hnub No | Q355D | Cov lej suav tshiab thiab thoob ntiaj teb (xws li Eurocode) yog raws li 355 MPa yield zog. |
Evolutionary ntsiab lus
Nws yog ib qho tseem ceeb uas yuav tsum nco ntsoov: Q355 tseem ceeb hloov Q345 hauv Suav tus qauv GB/T 1591-2018. Q355 tau ua raws li cov qib thoob ntiaj teb xws li S355 (Tebchaws Europe) thiab muaj ntau qhov kev tshawb fawb tau hais tawm lub zog. Q345B yog qib qub txeeg qub teg uas tseem siv tau vim nws cov khoom muaj nqis uas twb muaj lawm thiab paub zoo, tab sis rau cov qauv tshiab, tseem ceeb, Q355D yog qhov niaj hnub, zoo dua, thiab feem ntau txoj cai xaiv xaiv.
Kab hauv qab:
Xaiv Q345B rau tus nqi-sensitive, zoo li qub, ambient-cov qauv kub.
Xaiv Q355D rau cov qauv raug huab cua txias, dynamic / qaug zog loading, los yog qhov uas txhim khu kev ntseeg ruaj khov thiab kev ruaj ntseg puas muaj nuj nqis. Qib "D" toughness yog ib qho uas tsis yog -kev sib tham txog kev nyab xeeb rau cov txheej txheem tseem ceeb.