Q390Dyog lub siab -lub zog qis- alloy structural steel phaj, dav siv nyob rau hauv Tuam Tshoj txoj kev tsim kho thiab engineering machinery industries. Nws muaj npe raws li Suav teb tus qauv GB / T 1591-2018 "High Strength Low Alloy Structural Steels."
Nov yog cov ncauj lus kom ntxaws txog nws cov npe thiab cov yam ntxwv tseem ceeb:
1. Decoding lub npe "Q390D"
Q: Sawv rau Yield Strength (Suav: Qu fu dian).
390: Qhia qhov tsawg kawg nkaus tawm lub zog yog 390 MPa (Megapascals) rau cov hlau nrog lub thickness Tsawg dua los yog sib npaug li 16 hli.
D: Sawv cev rau qib zoo, uas feem ntau qhia txog cov hlau qhov cuam tshuam toughness ntawm qhov kub thiab txias. "D" txhais tau hais tias Charpy V- qhov ntsuas qhov cuam tshuam tau ua ntawm -20℃.
2. Cov yam ntxwv tseem ceeb ntawm kev ua haujlwm
Lub zog siab: Nws lub zog tawm los (Ntau dua lossis sib npaug ntawm 390 MPa) thiab lub zog tensile (490-650 MPa) yog qhov siab dua li cov khoom siv carbon zoo li Q235, tso cai rau nyias, sib dua cov qauv uas tuaj yeem nqa hnyav dua.
Zoo Tsawg-Tsub Toughness: Qib "D" ua kom nws tuav tau zoo ductility thiab cuam tshuam tsis zoo txawm tias nyob rau hauv qhov chaw txias mus txog -20 degree, pab tiv thaiv kev puas tsuaj.
Zoo Weldability thiab Formability: Txawm hais tias nws lub zog siab, nws yog tsim los nrog kev tswj cov tshuaj muaj pes tsawg leeg (carbon sib npaug, CE), ua rau nws haum rau cov txheej txheem vuam thiab fabrication (txawm tias nws yuav xav tau cov txheej txheem tswj ntau dua li qis dua - lub zog steels).
3. Hom tshuaj muaj pes tsawg leeg (piv txwv li)
Txhawm rau ua kom tiav nws cov khoom, nws muaj cov ntsiab lus zoo sib npaug ntawm alloying:
Cov pa roj carbon (C): Cov ntsiab lus qis mus rau nruab nrab kom ntseeg tau lub zog thaum tswj kev weldability.
Manganese (Mn): Lub hauv paus txhawb zog.
Micro-Alloying Elements: Xws li Niobium (Nb), Vanadium (V), Titanium (Ti). Cov no yog ib qho tseem ceeb rau cov nplej refinement thiab nag lossis daus.
Kev tswj nruj ntawm cov impurities: qis qis ntawm Sulfur (S) thiab Phosphorus (P) los txhim kho toughness.
4. Cov cheeb tsam tseem ceeb ntawm daim ntawv thov
Q390D feem ntau yog siv rau hauv cov khoom tseem ceeb ntawm qhov loj, qhov tseem ceeb, lossis hnyav -cov haujlwm ua haujlwm uas yuav tsum tau muaj lub zog siab thiab zoo qis - qhov kub thiab txias:
High-nce thiab siab heev- cov tsev nce siab (piv txwv li, cov kab hauv qab, hloov girders).
Loj - ncua cov qauv xws li chaw ntau pob, chaw ua yeeb yam, thiab tshav dav hlau terminals.
Heavy-cov chaw ua haujlwm, cov khoom siv mining, thiab crane girders.
Cov choj, cov ntug dej hiav txwv, thiab lwm yam kev tsim vaj tsev uas tuaj yeem ua haujlwm hauv huab cua txias.
Qee qhov ntawm kev tsim kho tshuab thiab tsheb.
5. Sib piv nrog Cov Qib Zoo sib xws
Vs. Q355D (tus thawj ua ntej): Q390D muaj lub zog ntau dua (Ntau dua lossis sib npaug ntawm 390 MPa vs. Ntau dua lossis sib npaug rau 355 MPa yield zog) tab sis feem ntau muaj cov pa roj carbon ntau dua me ntsis, xav tau kev saib xyuas ntau dua thaum vuam.
Vs. Q420D / Q460D: Q390D muaj qhov sib npaug zoo ntawm lub zog, toughness, weldability, thiab nqi. Cov qib siab dua (420, 460 MPa) muaj zog dua tab sis nyuaj rau cov txheej txheem thiab kim dua.
Cov lus xaus
| Feature | Kev piav qhia |
|---|---|
| Txuj | GB/T 1591-2018 (Tuam Tshoj) |
| Hom | Siab-Lub zog qis-Alloy (HSLA) Cov Qauv Hlau |
| Yam tsawg kawg nkaus Yield Strength | 390 MPa (rau thickness Tsawg dua los yog sib npaug rau 16mm) |
| Qib Qib / Toughness | Qib D - Kev ntsuas cuam tshuam ntawm -20 degree |
| Cov khoom tseem ceeb | Lub zog siab, zoo qis -kub toughness, weldable |
| Lub ntsiab Alloying Elements | C, Mn, plus micro- alloys (Nb, V, Ti) |
| Cov ntawv thov siv | Qhov tseem ceeb ntawm qhov siab- nce siab, loj- cov qauv dav, cov tshuab hnyav, txuas hniav hauv cov cheeb tsam txias |
Hauv essence,Q390D yog ntau yam, siab -kev tsim kho steel tshwj xeeb tsim los muab kev pom zoo ua ke ntawm lub zog, tawv, thiab cov khoom tsim rau kev thov cov qauv siv. Nws cov kev xaiv yeej ib txwm ua raws li kev suav cov engineering thiab ua raws li cov qauv tsim.