1. Tempering tom qab quenching: lub cim tseem ceeb rau cov cuab yeej hloov kho
Residual ntxhov siab nyem: Sempering (feem ntau 200-600 degree) softens lub microstructure me ntsis, cia sab hauv kev ntxhov siab los ntawm quenching rau dissipate. Qhov no txo qhov kev pheej hmoo ntawm cov ntawv tshaj tawm - kev ua haujlwm tawg (piv txwv li, thaum lub sij hawm vuam lossis machining) thiab txhim kho qhov ruaj khov.
Kev kho nruj: Los ntawm kev tshem tawm cov kev ntxhov siab ntau thiab ua kom zoo nkauj cov xeeb ntxwv lamellae, tempering nce charpy cuam tshuam lub zog los ntawm5–15%(piv txwv li, txij li 30 j rau 34-35 J at -40 degree). Cov khoom siv zuj zus mus dhau mus rau brittle baciture hauv qab kev thauj khoom.
Lub zog thiab hardness txo (me): Quenching only marginally increases Q355GNH's strength (tensile strength +<=5%) and hardness (HB +5–10). Tempering thim rov qab no me ntsis: tensile zog poob los ntawm2–4%, thiab hardness txo qis los ntawm3-8 HB{{0- Cov lag luam me me-} tawm rau kev nyuaj thiab ntxhov siab.
Corrosion Restorture Kev ceev: Proper tempering (avoiding overheating >650 degree) tswj kev faib cov khoom sib faib ntawm CU, CR, thiab NI. Qhov no ua kom pom tseeb cov hlau tseem ua cov tuab tiv thaiv patina, yog li kev ua haujlwm ua rau huab cua ua haujlwm tsis hloov ntau.
2. Tempering yam tsis muaj kev txiav txim siab ua ntej: tsawg heev cuam tshuam
Tsis muaj lub zog hloov tseem ceeb: Raws li {-}} q355gnh twb tau muaj ferrite {}} hlaws micrtructure. Tempering (txawm nyob ntawm 500-600 degree) tsis hloov tus qauv no txaus los hloov tensile / paib lub zog (hloov kho<2%).
Kev nyuaj thiab tawv tsis hloov pauv: Tsis muaj kev txhawj xeeb ntawm quenching, kev kub siab tsis tuaj yeem txhim kho kev nruj lossis txo qis. Tus txheej txheem no tsis tsim nyog rau li -}} qev tau ua rau nws qhov sib npaug ntawm lub zog thiab tawv.
3. Cov Ntsiab Tseem Ceeb: Tempering Kub
Tsawg kub (200-350 degree): Releves tsuas yog ib nrab kev ntxhov siab; Toardness txhim kho me ntsis, tab sis lub zog / hardness nyob ze rau post - Quenching qib.
Zoo siab kub (400-550 degree): Ua tiav qhov kev sib npaug zoo tshaj: Qhov ntau tshaj plaws ntxhov siab nyem, pom tsis meej txhim kho kev txhim kho, thiab tsuas yog ua kom muaj zog / hardness poob.
High Temperature (>600 degree): Causes excessive softening (tensile strength drops by >5%, hardness by >10 HB) thiab yuav coarsus qoob loo. Qhov no tsis muaj zog ntawm cov hlau thiab kev pheej hmoo cuam tshuam kev cuam tshuam alloy cim faib, ua kom mob corrosion.
