1. Lo lus nug: Dab tsi yog qhov tseem ceeb tshaj plaws ntawm Q255 thiab Q275 steel kav thiab 10 # thiab 20 # steel kav? Qhov kev sib txawv no puas txiav txim siab lawv cov ntawv thov tseem ceeb?
Teb: Qhov sib txawv ntawm qhov tseem ceeb tshaj plaws yog cov khoom siv: Q255 thiab Q275 yog cov pa roj carbon zoo tib yam steel kav, thaum 10 # thiab 20 # yog rau siab - zoo carbon structural steel kav. Qhov tseem ceeb sib txawv yog nyob rau hauv cov ntsiab lus impurity thiab cov uniformity ntawm cov tshuaj muaj pes tsawg leeg - siab - zoo carbon structural steel muaj qis sulfur thiab phosphorus impurity cov ntsiab lus, ntau ruaj khov tshuaj muaj pes tsawg leeg, thiab zoo sib xws hauv kev ua tau zoo, weldability, thiab txhua yam khoom. Qhov sib txawv no ncaj qha txiav txim siab qhov sib txawv ntawm cov tub ntxhais siv cov khoom siv: cov pa roj carbon zoo tib yam steel kav (Q255, Q275) feem ntau yog siv rau cov khoom siv nrog cov khoom siv qis-cov kabmob muaj peev xwm thiab cov kev xav tau qis rau kev ua tau zoo sib xws; siab- zoo carbon structural steel kav (10#, 20#) feem ntau yog siv rau hauv machining, dej thauj, thiab lwm yam scenarios nrog kev ua tau zoo dua thiab precision yuav tsum tau.
2. Nqe lus nug: Cov ntsiab lus tshwj xeeb twg suav nrog hauv cov tshuaj muaj pes tsawg leeg ntawm Q255 steel yeeb nkab? Lub luag haujlwm ntawm txhua yam yog dab tsi?
Teb: Lub ntsiab chemical muaj pes tsawg leeg (feem ntau) ntawm Q255 steel yeeb nkab yog: carbon (C) 0.18%-0.28%, manganese (Mn) 0.40%-0.70%, silicon (Si) Tsawg dua los yog sib npaug rau 0.35%, sulfur (S) Tsawg dua los yog sib npaug li 0.050% phosphorus (P 0.5%) cov seem yog hlau (Fe) thiab kab impurities. Lub luag haujlwm ntawm txhua lub ntsiab lus: Carbon yog lub hauv paus ntsiab lus txiav txim siab lub zog; cov ntsiab lus siab dua, lub zog siab dua. Manganese txhim kho lub zog thiab toughness ntawm hlau thiab txhim khu kev ua tau zoo. Silicon txhim khu lub hardness thiab lub zog ntawm steel, tab sis ntau npaum li cas yuav txo tau plasticity. Sulfur thiab phosphorus yog teeb meem impurities; sulfur ua rau "kub brittleness" nyob rau hauv steel, thiab phosphorus ua rau "txias brittleness," yog li lawv cov ntsiab lus yuav tsum nruj me ntsis tswj.
3. Nqe Lus Nug: Piv nrog 10# steel yeeb nkab, qhov sib txawv me me ntawm cov tshuaj muaj pes tsawg leeg ntawm 20# steel yeeb nkab yog dab tsi? Cov kev sib txawv no puas muaj kev cuam tshuam me me rau kev ua haujlwm? Teb: Dhau li ntawm cov ntsiab lus carbon (0.07% -0.14% rau 10 # steel thiab 0.17% -0.24% rau 20 # steel), muaj qhov sib txawv me ntsis ntawm cov ntsiab lus manganese ntawm ob: 0.35% -0.65% rau 10 # steel thiab 0.35% -0.65% rau cov ntsiab lus siab tshaj plaws ntawm lub teb chaws 20. rau 20 # steel); ob leeg muaj cov ntsiab lus silicon tsawg dua lossis sib npaug li 0.35%, thiab cov ntsiab lus sulfur thiab phosphorus tsawg dua lossis sib npaug li 0.035%. Cov kev sib txawv no muaj qee yam cuam tshuam rau kev ua tau zoo: 20 # steel, nrog nws cov ntsiab lus manganese siab dua me ntsis, muaj lub zog zoo dua me ntsis thiab tawv dua li 10 # steel, thaum 10 # steel, vim nws qis carbon thiab manganese cov ntsiab lus, muaj zoo plasticity thiab weldability. Yog li ntawd, txawm hais tias qhov kev ua tau zoo sib txawv tsis yog qhov kawg, lawv txaus los cuam tshuam qhov sib txawv ntawm lawv cov xwm txheej.
4. Lo lus nug: Dab tsi yog lub zog tawm los, lub zog tensile, thiab elongation ntawm Q255 steel yeeb nkab? Cov loads twg ua cov ntsuas kev ua haujlwm no txiav txim siab? Teb: Cov khoom siv hluav taws xob ntawm Q255 steel yeeb nkab (ntawm chav tsev kub, kub- dov lub xeev) yog: yield zog (σs) Ntau dua lossis sib npaug li 255 MPa, tensile zog (σb) 410-550 MPa, elongation (δ5) Ntau dua lossis sib npaug li 24%. Cov khoom no txiav txim siab tias nws tsim nyog rau kev coj tus kabmob nruab nrab zoo li qub lossis lub teeb dynamic loads, tab sis tsis haum rau cov kabmob hauv siab -ntau zaus cuam tshuam, kev nyuaj siab, lossis ib puag ncig muaj zog corrosive. Thaum nws lub zog ua tau raws li cov qauv kev cai dav dav, nws cov plasticity thiab toughness yog txwv, ua rau nws yooj yim rau kev puas tsuaj hauv kev cuam tshuam.
5. Nqe lus nug: Muab piv rau Q255 steel yeeb nkab, qhov kev txhim kho ntawm cov khoom siv ntawm Q275 steel yeeb nkab yog dab tsi? Hauv qhov xwm txheej twg qhov kev txhim kho no ua rau nws muaj txiaj ntsig zoo dua?
Teb: Muab piv rau Q255 steel yeeb nkab, Q275 steel yeeb nkab tau txhim kho cov cuab yeej zoo: cov khoom muaj zog nce los ntawm Ntau dua lossis sib npaug ntawm 255 MPa rau ntau dua lossis sib npaug rau 275 MPa, lub zog tensile nce ntawm 410-550 MPa rau 490- thiab ntau dua los ntawm qhov sib npaug 24% rau ntau dua lossis sib npaug rau 20%. Cov kev txhim kho no txhais tau hais tias Q275 steel kav muaj zog load-bearing muaj peev xwm thiab zoo dua tiv thaiv deformation. Yog li ntawd, lawv muaj txiaj ntsig zoo dua nyob rau hauv cov xwm txheej uas dais loj zoo li qub thiab muaj lub zog ntau dua, xws li kev txhawb nqa steel loj, cov cuab yeej siv hnyav, thiab kev txhawb nqa cov yeeb nkab. Txawm li cas los xij, lawv cov yas yog me ntsis zuj zus, ua rau lawv tsis haum rau cov xwm txheej uas yuav tsum tau khoov thiab stamping ntau zaus.
