1. Lo lus nug: Dab tsi yog cov khoom siv ntawm 10 # steel yeeb nkab? Vim li cas nws cov yas thiab tawv zoo dua li Q255 thiab Q275 steel yeeb nkab?
Teb: Cov khoom siv ntawm 10 # steel yeeb nkab yog "tsis muaj zog, siab yas, thiab siab tawv." Cov cim qhia tshwj xeeb (kub-rolled xeev): yield zog Ntau dua lossis sib npaug ntawm 205MPa, tensile zog 335-475MPa, elongation Ntau dua lossis sib npaug li 31%, cuam tshuam toughness (k) Ntau dua lossis sib npaug li 49J / cm². Nws cov plasticity thiab toughness yog superior rau Q255 thiab Q275 steel kav, feem ntau yog vim nws cov ntsiab lus qis carbon (10 # steel muaj 0.07% -0.14% carbon, deb tshaj li 0.18% -0.38% ntawm Q255 thiab Q275), thiab qis impurity cov ntsiab lus - qhov qis dua cov pa roj carbon monoxide, qhov defects ntawm cov hlau tsis muaj zog. qhov zoo dua nws toughness, thiab qhov tsawg nws yog nkig tawg.
2. Nqe lus nug: Cov cuab yeej cuab tam ntawm 20# steel yeeb nkab yog dab tsi? Nws sib npaug li cas lub zog thiab ductility, thiab nyob rau hauv cov xwm txheej twg nws tsim nyog rau cov ntawv thov kom muaj kev sib luag?
Teb: Cov khoom siv ntawm 20 # steel yeeb nkab yog nyob rau theem sib npaug ntawm "nruab nrab lub zog thiab zoo ductility." Cov ntsuas tshwj xeeb (kub-lub xeev dov): tawm lub zog Ntau dua lossis sib npaug ntawm 245MPa, lub zog tensile Ntau dua lossis sib npaug ntawm 410MPa, elongation Ntau dua lossis sib npaug li 25%, cuam tshuam toughness (k) Ntau dua lossis sib npaug li 39J / cm². Lub ntsiab yog vim li cas rau nws lub peev xwm los sib npaug zog thiab ductility yog tias cov ntsiab lus carbon yog tswj ntawm 0.17% thiab 0.24%, zam ob qho tib si lub zog tsis txaus los ntawm cov ntsiab lus carbon tsawg ntawm 10 # steel thiab txo cov ductility los ntawm cov pa roj carbon ntau ntawm Q275 steel. Yog li ntawd, nws yog qhov tsim nyog rau cov xwm txheej uas yuav tsum tau muaj kev sib npaug ntawm lub zog thiab cov ductility, xws li cov ncej thiab lub tes tsho hauv machining, cov kav dej thauj cov kav dej (cov kabmob muaj qee qhov siab thiab xav tau qee qhov kev nyuaj siab), thiab cov khoom siv uas xav tau vuam thiab khoov.
3. Nqe lus nug: Q255, Q275, 10#, thiab 20# steel kav yog dab tsi? Kev sib raug zoo ntawm hardness thiab carbon cov ntsiab lus yog dab tsi? Teb: Lub hardness qeb ntawm plaub hom steel kav (los ntawm siab tshaj mus rau qis tshaj) yog: Q275> Q255> 20#> 10#. Muaj kev sib raug zoo ntawm hardness thiab carbon cov ntsiab lus: thaum lwm cov tshuaj muaj pes tsawg leeg zoo sib xws, cov ntsiab lus carbon ntau dua, qhov hardness ntawm cov hlau ntau dua. Q275 muaj cov ntsiab lus carbon siab tshaj plaws (0.28%-0.38%), yog li ntawd qhov nyuaj tshaj plaws; Q255 muaj qhov thib ob siab tshaj carbon cov ntsiab lus (0.18%-0.28%), thiab qhov thib ob siab tshaj hardness; 20 # steel muaj cov ntsiab lus siab dua me ntsis (0.17% -0.24%) dua li 10 # steel (0.07% -0.14%), yog li nws cov hardness siab dua 10 # steel, thaum 10 # steel muaj cov ntsiab lus qis tshaj plaws thiab qis tshaj hardness.
4. Nqe Lus Nug: Qhov kub hloov pauv muaj dab tsi ntawm cov khoom siv ntawm Q255 steel kav? Dab tsi yuav tsum tau ceev faj thaum siv Q255 steel kav hauv qis- qhov kub thiab txias? Teb: Kub hloov pauv cuam tshuam rau cov khoom siv ntawm Q255 steel kav: ntawm qhov kub siab (siab tshaj 300 degree), nws lub zog tawm los thiab lub zog tensile txo qis, thaum nws plasticity nce, ua rau nws yooj yim rau deformation; ntawm qhov kub thiab txias (qis dua -20 degree), nws cov plasticity thiab toughness txo qis, ua rau nws yooj yim rau nkig tawg, piv txwv li, "txias brittleness" tshwm sim. Thaum siv Q255 steel kav nyob rau hauv qis- qhov kub thiab txias ib puag ncig, yuav tsum tau ceev faj hauv qab no: tsis txhob cuam tshuam cov loads, txo qhov kev ntxhov siab, thiab yog tias tsim nyog, ua qis- qhov kub thiab txias kev kho mob los txhim kho nws qhov qis- kub toughness. Tsis tas li ntawd, tsis txhob khoov, stamping, thiab lwm yam kev ua haujlwm txias hauv qhov chaw qis qis kom tiv thaiv cov yeeb nkab tawg.
5. Nqe lus nug: Piv rau Q255 steel kav, uas muaj kev cuam tshuam zoo dua, 20 # steel kav? Qhov sib txawv no tshwm sim li cas hauv kev siv tswv yim?
Teb: Qhov cuam tshuam toughness (k Ntau dua lossis sib npaug rau 39J / cm²) ntawm 20 # steel kav yog superior rau Q255 steel kav (k Ntau dua lossis sib npaug rau 34J / cm²). Qhov sib txawv no tshwm sim nyob rau hauv cov ntaub ntawv siv tau raws li hauv qab no: 20 # steel kav yog qhov tsim nyog rau cov xwm txheej uas tuaj yeem tiv taus qhov cuam tshuam me ntsis, xws li txuas cov kav dej hauv cov tshuab xa mus thiab cov qauv ntawm lub tsheb chassis. Thaum raug cuam tshuam tam sim ntawd, lawv tuaj yeem nqus tau lub zog los ntawm cov yas deformation thiab tsis txhob tawg. Ntawm qhov tod tes, Q255 steel kav tsis haum rau cov xwm txheej uas cuam tshuam rau kev thauj khoom vim lawv qhov cuam tshuam tsis zoo. Tsis tas li ntawd, lawv yuav ua rau cov pob txha tawg, ua rau cov khoom siv tsis ua haujlwm lossis kev nyab xeeb.
