### 1. Yog 4140 Cov pa hlau qis?
Tsis yog, 4140 tsis yog cov hlau roj av tsis tshua muaj pa. Nws tau cais raws li cov pa roj carbon steel. Nws cov ntsiab lus carbon yog kwv yees li 0.40%, uas tau muab pov tseg hauv nruab nrab cov pa roj carbon ntau. Cov ntsiab lus carbon ntau dua muab nws lub zog zoo thiab lub zog, tshwj xeeb tshaj yog tom qab kev kho cua sov.
### 2. Puas yog 1018 cov pa roj carbon?
Yog, 1018 yog ib qho av roj carbon steel. Nws muaj cov ntsiab lus carbon txog li 0.18%, uas yog qhov raug rau cov roj carbon (lossis cov hlau me). Qhov no ua rau nws yooj yim rau daim ntawv thiab weld, tab sis nws tsis tuaj yeem yog qhov nyuaj los ntawm kev kho cua sov.
### 3. Puas yog 4340 muaj zog tshaj 4140?
Yes, 4340 is generally stronger than 4140, particularly in larger cross-sections. Ob qho tib si yog cov hlau roj carbon steels, tab sis 4340 yog cov hlau sib tw uas muaj npib tsib xee. Nickel tau zoo heev rau cov tawv nqaij tawv ntawm cov hlau, tso cai rau nws ua kom muaj zog, tawv microstructure thoob plaws ntau cov tshuaj ntxuav cua sov. Qhov no ua rau muaj zog dua thiab tawv.
### 4. Puas yog 4130 tus neeg qis carbon steel?
Technically, 4130 nyob ntawm ciam teb tab sis feem ntau yog feem ntau tau cais ua qhov qis-} alloy, nruab nrab cov pa roj carbon hlau. Nws cov ntsiab lus carbon yog kwv yees li 0.30%, uas yog nyob rau ntawm qhov siab kawg ntawm cov pa roj carbon tsawg lossis tsawg kawg ntawm cov pa roj carbon. Txawm li cas los xij, vim nws cov khoom siv alloy (feem ntau chromium) thiab nws cov feem ntau siv hauv tshav kub-}} Cov hlau siv nrog cov pa roj carbon nruab nrab zoo li 4140.
### 5. Dab tsi yog muaj zog dua, 4130 lossis 4140 steel?
4140 steel hlau muaj zog tshaj 4130 tus hlau. Thawj qhov laj thawj yog nws cov ntsiab lus muaj roj ntau dua (0.40% vs {{}}%). Thaum ob qho tib si cov hlau yog cua sov -}} nrhiav rau tib lub zog nyuaj thiab hnav tsis kam vim yog cov kev pab ntxiv rau cov muaj roj carbon ntau ntxiv.
