1. Cov khoom siv twg yog Astm A333 qib 3?
Teb: Nws yog cov pa roj carbon hlau tsawg-kub tsim rau cov chaw tsawg-ib puag ncig (qis rau -45 ° C).
Cov ntaub ntawv ntxiv: nws cov tshuaj lom neeg (cov roj ntsha, silicon, manganese, thiab lwm yam) ua kom sov-kub thiab tiv thaiv brittle crushing.
2. Nws daim ntawv thov tseem ceeb yog dab tsi?
Teb:
Liquefied nkev (lng) pipelines;
Petrochemical cryogenic khoom;
Cov tshuab tub yees thiab txias cia khoom siv piping.
Nta: Tsawg-kub cuam tshuam tsis kam, haum rau cov chaw hnyav.
3. Nws txawv li cas los ntawm cov yeeb nkab steel hlau (xws li istm A106)?
Teb:
A333 gr . 3}: Hais txog kev ua tau kub thiab yuav tsum tau xeem dhau Charpy cuam tshuam kev ntsuas;
A106: Haum rau kev siv kub siab (tsis muaj qhov ntsuas kub tsawg dua -.
Qhov sib txawv sib txawv: kev kho cua sov ua haujlwm thiab cuam tshuam cov qauv.
4. Dab tsi yog nws cov tshuaj lom neeg muaj kuab lom thiab cov khoom siv neeg ua haujlwm?
Tshuaj lom neeg muaj pes tsawg leeg (%):
C ≤ 0.19, mn=0.31-0.64, p ≤ 0.025, s ≤ 0.025.
Cov Khoom Siv Neeg Kho Tshuab:
Lub zog tensile ≥ 450 mpa, kom lub zog ≥ 240 mpa, elongation ≥ 30%.
5. Nws muaj kev ntsuas kub yog li cas?
Teb: Qhov nyuaj tau tshawb xyuas ntawm -45 ° C Siv Charpy V-Meych cuam tshuam kev cuam tshuam.
Cov Qauv Yuav Tsum Tau Ua: Yam tsawg kawg cuam tshuam lub zog rau txhua qhov hnoos qeev ≥ 18 J, nruab nrab ≥ 20 Y.
