Q345 Cov Khoom Siv Neeg Kho Tshuab
Q345 yog qeb tseem ceeb hauv Suav teb haiv neeg (GB / T 1591 {{{{-}}}}} all} all {tus qauv hlau "). Nws yog qhov qis -} alloy, siab- lub zog txheem hlau. Nws cov cuab yeej ua haujlwm yog cov cim tseem ceeb ntawm cov khoom siv thauj khoom-muab cov khoom muaj peev xwm, kev muaj zog, thiab kev ua haujlwm. Nws yog dav siv hauv kev tsim kho, txuas hniav, kev tsim khoom machinery, cov hlab ntsha siab, thiab lwm thaj teb. Cov hauv qab no yog cov ncauj lus kom ntxaws tshuaj xyuas ntawm cov kws kho tshuab ntawm Q345 los ntawm plaub qhov kev xav, cov yam sib txawv hauv cov lus qhia txawv, thiab kev txiav txim siab thov.
1. Q345 tseem ceeb mechanical tej yam (GB / T 1591-2018 cov qauv tsim nyog)
Cov neeg kho tshuab ntawm Q345 yuav tsum ua kom tau lub synergistic yuav tsum tau ntawm "lub zog + kev nyuaj + ductility." Cov kev qhia tshwj xeeb rau cov tuab tuab (lossis diameters) yuav txawv me ntsis vim kev sib txawv ntawm cov txheej txheem dov / forging. Cov hauv qab no yog cov ntsiab lus tshwj xeeb ntawm chav sov (siv feem ntau siv Q345b ua piv txwv, rau thurnnesses ≤16mm):
Lus Cim: Kev cuam tshuam ntawm tuab rau cov khoom siv mechanical
Rau Q345 cov khoom tuab ntau dua 16 hli, tus qauv tso cai rau kev txo me me thiab coarser nplej thaum tuab tuab yob). Cov kev hloov kho tshwj xeeb yog raws li hauv qab no:
Thickness 16-40mm: Tawm Zog ≥ 335mpa, tensile lub zog 450-600MPA;
Thickness 40-63mm: muab lub zog ≥ 325mpa, tensile lub zog 440-590MPA;
Thickness 63-100mm: Pom zoo lub zog ≥ 315mpa, tensile muaj zog 430-580MPA. Ii. Yam cuam tshuam rau Q345 cov khoom siv mechanical
Cov cuab yeej ua haujlwm ntawm Q345 tau txiav txim siab los ntawm nws cov tshuaj lom neeg muaj pes tsawg leeg thiab kev kho cua sov / dov cov txheej txheem. Cov ntsiab lus tseem ceeb yog raws li hauv qab no:
Tshuaj lom neeg tshuaj tua kab (ineoy tseem ceeb)
Q345 yog raws li fe - c. Kev sib npaug ntawm lub zog siab thiab kev nruj me ntsis yog ua tiav los ntawm kev sib ntxiv ntawm cov khoom siv me me ntawm alloy. Cov ntsiab lus tseem ceeb pab:
Mn (manganese): ib tug tub ntxhais ntxiv dag zog ntxiv uas nce tawm lub zog muaj zog dua thaum tseem txhim kho kev muaj zog (zam kev ua kom nruj (zam kev brittleness);
Si (silicon): Pab cov tshuaj daws teeb meem zoo nkauj, txo cov hlau lub ntsej muag zoo nkauj;
NB / V / ti (Niobium / Vanadium / Titanium): Microalloying cov ntsiab lus uas ua rau muaj qhov sib luag ntawm cov khaub ncaws Q345 los ntawm cov khoom siv roj carbon;
P / s (phosphorus / Sulphurat / Sulphur): Cov khoom phom sij uas yuav tsum tau nruj me ntsis tswj (p ≤ 0.035%). Txwv tsis pub, cov khoom yuav dhau los ua "txias brittle" (p) lossis "kub me ntsis" (s), txo qis. Kev xa khoom (dov / kev kho cua sov)
Qhov kev xa khoom ntawm Q345 hlau ncaj qha cuam tshuam nws cov khoom siv neeg kho tshuab. Cov xwm txheej nquag muaj xws li:
Kub -}} rolled (ar): Siv cov txheej txheem sib xyaw, muaj zog rau cov txheej txheem tsis muaj tsawg-}}}}} qhov kub thiab txias yuav tsum tau);
Normalized (n): rhuab mus rau saum toj AC3 (kwv yees li 850} {}}}
Controlled Rolling and Controlled Cooling (TMCP): By controlling the rolling temperature and cooling rate, grain refinement is achieved and precipitation growth is suppressed, resulting in optimal mechanical properties (yield strength can approach 400 MPa, with higher toughness, often used for thicker, high-demand components).