Q390Byog ib qho qis- alloy, siab - lub zog cov qauv hlau tau teev tseg hauv Suav teb tus qauv GB/T 1591-2018 (Tsawg- alloy siab - lub zog steels). Nws yog qib ib qib siab zog dua li Q355B.
Nov yog cov ncauj lus kom ntxaws txog nws cov yam ntxwv tseem ceeb:
1. Core Material Identity
Txheem:GB/T 1591-2018.
Qib Qib Decoding:
Q:Sawv rau Yield Strength (屈, Qu).
390:Qhia qhov tsawg kawg nkaus yield zog (ReH) nyob rau hauv MPa rau cov khoom thinnest daim ntawv (thickness tsawg dua los yog sib npaug rau 16 hli). Yog li ntawd, Q390B muaj qhov tsawg kawg nkaus tawm lub zog ntawm Greater dua los yog sib npaug rau 390 MPa.
B:Sawv cev rau qib zoo, uas lav qhov cuam tshuam tshwj xeeb ntawm +20℃.
2. Cov cuab yeej cuab tam tseem ceeb
Cov khoom yog thickness- nyob ntawm. Cov nram qab no yog rau feem ntau thickness ntau:
Yield zog (ReH):
Ntau dua lossis sib npaug li 390 MPa(rau thickness t Tsawg dua los yog sib npaug rau 16 hli)
Lub zog txo qis rau cov phaj tuab (piv txwv li, Ntau dua lossis sib npaug ntawm 370 MPa rau 16 < t Tsawg dua lossis sib npaug li 40 mm, ib lub rooj qauv).
Tensile zog (Rm): 490 - 650 MPa
Elongation ntawm Break (A):Ntau dua lossis sib npaug li 19% (rau t Tsawg dua lossis sib npaug rau 40mm, cov qauv ntev)
Impact Toughness:Guaranteed Charpy V-notch impact zog Ntau dua los yog sib npaug rau 34 J ntawm +20℃(transverse specimen). Qhov no yog qhov tseem ceeb ntawm qib "B".
3. Tshuaj muaj pes tsawg leeg
Q390B ua tiav nws lub zog ntau dua los ntawm kev tswj hwm qis- alloy muaj pes tsawg leeg nrog cov qib siab dua me ntsis ntawm cov khoom ntxiv xws li Manganese (Mn) piv rau Q355B, thiab tej zaum yuav suav nrog cov ntsiab lus microalloying xws li Vanadium (V) lossis Niobium (Nb). Cov txwv tseem ceeb (xws li):
Cov pa roj carbon (C):Tsawg dua lossis sib npaug li 0.20%
Silicon (Si):Tsawg dua lossis sib npaug li 0.55%
Manganese (Mn):Tsawg dua lossis sib npaug li 1.70%
Phosphorus (P) & Sulfur (S):Tsawg txwv (piv txwv li, P Tsawg dua lossis sib npaug rau 0.030%, S Tsawg dua lossis sib npaug li 0.030%) kom ntseeg tau tias weldability thiab toughness.
Carbon sib npaug (Ceq):Feem ntau nyob ib ncig ntawm 0.45% lossis siab dua, ua rau nws cov weldability xav tau ntau dua Q355B.
4. Cov ntawv thov tseem ceeb
Q390B yog siv nyob rau hauv hnyav loaded qauv los yog hnyav-sensitive designs qhov twg Q355B tsis txaus, tab sis tag nrho lub zog ntawm Q460 tsis tas yuav tsum tau. Cov kev siv ib txwm muaj xws li:
Hnyav- lub luag haujlwm muaj vaj tse (piv txwv li, cov chaw tsim hluav taws xob, kev cob qhia loj nrog cov cranes hnyav heev).
Loj -cov qauv dav (ru tsev chaw ntau pob, chaw ua yeeb yam).
Cov ntsiab lus tseem ceeb ntawm cov choj (lub ntsiab girders, arches).
Mining thiab heavy machinery (thav duab, booms).
High -nce lub tsev cores nyob rau hauv qis pem teb ntawm cov qauv siab heev.
5. Kev sib piv nrog Common Steels
| Qib Steel | Min Yield Strength (t Tsawg dua lossis sib npaug li 16mm) | Qhov txawv tseem ceeb vs. Q390B |
|---|---|---|
| Q355B | 355 MPa rau | Tsawg zog, zoo weldability. Q390B yog nws qhov siab dua - lub zog hloov kho. |
| Q390B | 390 MPa ua | Baseline siab - qib zog. Muaj zog dua Q355B, xav tau kev saib xyuas ntau dua hauv vuam. |
| Q420B | 420 MPa rau | Tom ntej no lub zog theem. Feem ntau siv hauv cov ntawv zoo sib xws tab sis xav tau ntau dua. |
| ASTM A572 Gr 1. | 380 MPa (55 ksi) | Asmeskas ze - sib npaug. Zoo heev nyob rau hauv lub zog thiab kev siv. |
6. Kev txiav txim siab ua haujlwm tseem ceeb
Vuam:Vim nws lub zog ntau dua thiab sib npaug carbon, vuam Q390B yuav tsum tau ua raws li cov txheej txheem nruj. Tsawg- cov txheej txheem hydrogen welding thiab feem ntau preheating yog qhov yuav tsum tau ua kom tsis txhob txias tawg. Post-weld heat treatment tej zaum yuav xav tau rau cov ntu tuab.
Forming & Txiav:Yuav ua tau txias tsim thiab txiav siv cov txheej txheem (plasma, nplaim taws), tab sis lub zog siab dua yuav tsum muaj zog ntau dua.
Cov ntsiab lus
Q390B yog tus qauv Suav siab - lub zog cov qauv hlau nrog qhov tsawg kawg nkaus tawm lub zog ntawm 390 MPa thiab lav qhov cuam tshuam qhov hnyav ntawm chav tsev kub. Nws yog cov khoom siv nyiaj txiag zoo rau cov kws ua haujlwm kom txo qhov hnyav thiab ua kom muaj peev xwm thauj khoom hauv cov qauv uas Q355B tsis txaus, tab sis nws xav tau kev ua kom zoo dua qub, tshwj xeeb tshaj yog nyob rau hauv vuam. Nws siv yog tswj hwm los ntawm cov qauv tsim qauv zoo li GB 50017.