1. Lub hom phiaj
Alloy quenched thiab tempered steel yog dav siv los tsim ntau yam tseem ceeb ntawm tsheb, tsheb laij teb, tshuab cuab yeej thiab lwm yam tshuab, xws li lub zog, ncej, txuas rods, bolts, thiab lwm yam.
2. Cov kev xav tau ntawm kev ua haujlwm
Feem ntau ntawm tempered qhov chaw dais ntau yam ntawm kev ua haujlwm loads, cov kev ntxhov siab yog qhov nyuaj, thiab xav tau cov khoom siv kho tshuab siab, uas yog, lawv muaj lub zog siab, zoo plasticity thiab toughness. Alloy quenched thiab tempered steel kuj xav tau zoo hardenability. Txawm li cas los xij, qhov sib txawv muaj cov kev ntxhov siab sib txawv thiab cov kev xav tau sib txawv rau hardenability.
3. Cov khoom xyaw yam ntxwv
(1) Cov pa roj carbon nruab nrab: Cov ntsiab lus carbon feem ntau yog nyob nruab nrab ntawm 0.25% thiab 0.50%, feem ntau yog 0.4%;
(2) Ntxiv cov ntsiab lus xws li Cr, Mn, Ni, Si, thiab lwm yam los txhim kho hardenability: Ntxiv nrog rau kev txhim kho hardenability, cov hlau alloying tseem tuaj yeem tsim cov hlau ferrite thiab ua kom lub zog ntawm cov hlau. Piv txwv li, kev ua tau zoo ntawm 40Cr steel tom qab quenching thiab tempering kho yog ntau dua li ntawm 45 steel;
(3) Ntxiv cov ntsiab lus los tiv thaiv hom thib ob ntawm temper brittleness: Alloy quenched thiab tempered steel uas muaj Ni, Cr, Mn yog nquag tsim hom thib ob ntawm temper brittleness thaum tempered kub thiab maj mam txias. Ntxiv Mo thiab W rau hlau tuaj yeem tiv thaiv hom thib ob ntawm temper brittleness. Cov ntsiab lus tsim nyog yog li ntawm 0.15% rau 0.30% Mo lossis 0.8% txog 1.2% W.
Kev sib piv ntawm cov khoom tom qab quenching thiab tempering ntawm 45 steel thiab 40Cr steel
Qib steel thiab kho cua sov raws li txoj cai Sectional loj / hli sb / MPa ss / MPa d5 / % y /% ak / kJ / m2
45 steel 850 degree dej quenching, 550 degree tempering f 50 700 500 15 45 700
40Cr steel 850 degree roj quenching, 570 degree tempering f50 (center) 850 670 16 58 1000
4. steel hom thiab qib (1) 40Cr low-hardenability quenched thiab tempered steel: Qhov tseem ceeb txoj kab uas hla ntawm cov roj quenching ntawm hom hlau no yog 30mm ~ 40mm, thiab nws yog siv los tsim cov khoom tseem ceeb ntawm qhov ntau thiab tsawg. (2) 35CrMo nruab nrab-hardenability alloy quenched thiab tempered steel: Qhov tseem ceeb txoj kab uas hla ntawm cov roj quenching ntawm hom hlau no yog 40mm ~ 60mm. Ntxiv molybdenum tuaj yeem tsis tsuas yog txhim kho hardenability, tab sis kuj tiv thaiv ob hom temper brittleness. (3) 40CrNiMo high-hardenability alloy quenched thiab tempered steel: Qhov tseem ceeb txoj kab uas hla ntawm roj quenching ntawm hom hlau no yog 60 hli -100 hli, feem ntau yog chromium-nickel steel. Ntxiv qhov tsim nyog molybdenum rau chromium-nickel steel tsis tsuas yog muaj qhov zoo hardenability, tab sis kuj tshem tawm ob hom temper brittleness.
5. Kev kho cua sov thiab cov yam ntxwv ntawm cov khoom siv hluav taws xob zaum kawg ntawm kev kho cua sov ntawm alloy quenched thiab tempered steel yog quenching thiab high-temperature tempering (quenching thiab tempering kho). Alloy quenched thiab tempered steel muaj siab hardenability, thiab roj feem ntau yog siv. Thaum lub hardenability siab tshwj xeeb, nws tuaj yeem ua cua txias, uas tuaj yeem txo cov kev kho cua sov. Cov khoom kawg ntawm alloy quenched thiab tempered steel yog txiav txim los ntawm tempering kub. Feem ntau, tempering ntawm 500 degree -650 degree yog siv. Los ntawm kev xaiv qhov kub thiab txias, cov khoom xav tau tuaj yeem ua tiav. Txhawm rau tiv thaiv ob hom temper brittleness, txias ceev (dej txias los yog roj txias) tom qab tempering yog qhov zoo rau kev txhim kho toughness. Cov qauv ntawm alloy quenched thiab tempered steel tom qab kev kho cua sov yog tempered sorbite. Rau qhov chaw uas yuav tsum tau hnav-resistant nto (xws li lub zog thiab spindles), induction cua sov nto quenching thiab low-temperature tempering yog ua, thiab cov qauv nto yog tempered martensite. Qhov tawv tawv tuaj yeem ncav cuag 55HRC ~ 58HRC. Lub zog ntawm alloy quenched thiab tempered steel tom qab quenching thiab tempering yog hais txog 800MPa, thiab qhov cuam tshuam toughness ntawm cov tub ntxhais hardness ntawm 800kJ / m2 tuaj yeem ncav cuag 22HRC ~ 25HRC. Yog hais tias tus ntoo khaub lig-section loj thiab tsis hardened, qhov kev ua tau zoo yuav raug txo kom tsawg.
