1. Nqe lus nug: "Q" nyob rau hauv Q255 thiab Q275 steel kav yog dab tsi? Dab tsi yog lub hauv paus tseem ceeb rau lawv cov npe qib?
Teb: "Q" yog thawj tsab ntawv ntawm Suav pinyin rau "yield," sawv cev rau lub zog ntawm cov yeeb nkab steel. Ob lub Q255 thiab Q275 steel kav yog rau carbon structural steel kav. Lub hauv paus tseem ceeb rau lawv cov npe qib yog qhov txiaj ntsig ntawm lub zog muaj zog -Q255 qhia tias tus qauv yield zog ntawm cov yeeb nkab steel yog kwv yees li 255 MPa, thiab Q275 qhia tias tus qauv yield zog ntawm cov yeeb nkab steel yog kwv yees li 275 MPa. Tus nqi qib ncaj qha qhia txog cov yeeb nkab steel muaj peev xwm tiv taus cov yas deformation; tus nqi siab dua, qhov muaj zog ntawm cov khoom muaj zog.
2. Lo lus nug: "10" thiab "20" nyob rau hauv 10 # thiab 20 # steel kav yog dab tsi? Cov kev faib qib twg yog cov hom steel kav?
Teb: Nyob rau hauv 10 # thiab 20 # steel kav, "10" thiab "20" sawv cev rau cov ntsiab lus ntawm cov pa roj carbon structural steel siv nyob rau hauv cov yeeb nkab, qhia nyob rau hauv ib feem ntawm kaum txhiab (ppm). Ntawd yog, 10 # steel muaj qhov nruab nrab cov ntsiab lus ntawm kwv yees li 0.10%, thiab 20 # steel muaj cov ntsiab lus nruab nrab ntawm kwv yees li 0.20%. Cov yeeb nkab steel no yog siab -cov pa roj carbon zoo steel kav, txawv ntawm cov pa roj carbon zoo tib yam cov kav hlau txuas nrog Q255 thiab Q275. Lawv muaj qis impurity cov ntsiab lus, ntau yam tshuaj lom neeg muaj pes tsawg leeg, thiab ruaj khov mechanical zog.
3. Lo lus nug: Dab tsi yog cov khoom tseem ceeb sib txawv ntawm Q255, Q275, 10#, thiab 20# steel kav? Cov kev sib txawv no cuam tshuam li cas rau kev ua haujlwm ntawm cov kav dej steel? Teb: Cov khoom tseem ceeb sib txawv feem ntau yog nyob rau hauv cov ntsiab lus carbon thiab impurity cov ntsiab lus: Q255 thiab Q275 yog cov pa roj carbon zoo tib yam steels, nrog cov ntsiab lus carbon ntawm kwv yees li 0.18%-0.28% thiab 0.28%-0.38% raws li, thiab cov impurity siab heev (sulfur, 0.5% phosphor) cov ntsiab lus sib npaug ntawm L. phosphorus Tsawg dua lossis sib npaug li 0.045%); 10 # thiab 20 # yog cov khoom siv zoo carbon steel, nrog cov ntsiab lus carbon ntawm kwv yees li 0.07% -0.14% thiab 0.17% -0.24% raws li, thiab txawm tias cov ntsiab lus qis dua (sulfur thiab phosphorus tsawg dua lossis sib npaug li 0.035%). Cov ntsiab lus carbon ntau dua ua rau muaj zog dua thiab hardness ntawm cov yeeb nkab steel, tab sis qis plasticity thiab toughness; qis impurity cov ntsiab lus ua rau zoo weldability, corrosion kuj, thiab kev ua tau zoo.
4. Nqe Lus Nug: Cov khoom siv tshwj xeeb sib txawv ntawm Q255 thiab Q275 steel kav yog dab tsi? Dhau li yield zog, dab tsi lwm yam khoom txawv? Teb: Qhov tseem ceeb sib txawv ntawm ob cov ntaub ntawv nyob rau hauv lawv cov ntsiab lus carbon thiab yield zog. Q255 muaj cov ntsiab lus carbon ntawm 0.18% -0.28% thiab lub zog tawm ntawm 255 MPa; Q275 muaj cov ntsiab lus carbon ntawm 0.28% -0.38% thiab lub zog tawm ntawm 275 MPa. Tsis tas li ntawd, lawv lub zog tensile kuj txawv: Q255 muaj lub zog tensile ntawm 410-550 MPa, thaum Q275 muaj lub zog tensile ntawm 490-630 MPa. Hais txog plasticity, Q255 muaj qhov elongation (δ5) Ntau dua lossis sib npaug li 24%, thaum Q275 muaj qhov elongation Ntau dua lossis sib npaug li 20%. Qhov no txhais tau hais tias Q275 muaj zog dua tab sis qis dua cov yas me ntsis, thiab nws qhov hardness kuj tseem me ntsis siab dua Q255.
5. Lo lus nug: Dab tsi yog cov khoom tseem ceeb sib txawv ntawm 10 # thiab 20 # steel kav? Cov kev sib txawv no puas yuav ua rau muaj qhov sib txawv tseem ceeb hauv lawv daim ntawv thov scenarios? Teb: Qhov sib txawv tseem ceeb ntawm 10 # thiab 20 # steel kav yog nyob rau hauv lawv cov ntsiab lus carbon . 10# steel muaj 0.07%-0.14% carbon, hos 20# steel muaj 0.17%-0.24%. Tsis tas li ntawd, muaj qhov sib txawv me ntsis ntawm manganese cov ntsiab lus (10 # steel muaj 0.35% -0.65% manganese, thaum 20 # steel muaj 0.35% -0.65%, nrog qee cov qauv muaj qhov siab dua me ntsis rau cov ntsiab lus manganese hauv 20 # steel). Qhov sib txawv no ua rau cov khoom siv sib txawv: 20 # steel muaj lub zog ntau dua (Ntau dua lossis sib npaug ntawm 245MPa) thiab lub zog tensile (Ntau dua lossis sib npaug rau 410MPa) dua li 10 # steel (yield zog Ntau dua lossis sib npaug rau 205MPa, lub zog tensile siab dua lossis sib npaug ntawm 335MPa.), tiam sis cov yas qis dua. Yog li ntawd, lawv daim ntawv thov scenarios txawv qhov txawv: 10 # steel kav yog haum rau tsawg-load, high-plasticity daim ntaub ntawv, thaum 20 # steel kav yog haum rau nruab nrab-load daim ntaub ntawv uas sib npaug zog thiab yas.
