ASTM A656/A656M Qib 50 yog siab -lub zog, qis-alloy (HSLA) kub-rolled steel kauj nrog lub zog tsawg kawg nkaus ntawm 345 MPa (50 ksi). Tsim los rau cov qauv tsim thiab tsim cov ntawv thov uas yuav tsum tau txhim kho lub zog- mus rau- qhov hnyav piv, nws muaj cov qauv zoo heev thiab weldability thaum tuav zoo toughness.
Qib no ua tiav nws cov khoom los ntawm microalloying nrog cov ntsiab lus xws li niobium, vanadium, lossis titanium, ua ke nrog kev tswj cov txheej txheem dov. Nws yog feem ntau siv nyob rau hauv tsheb thav duab, tsheb chassis, cov khoom siv ua liaj ua teb, thiab cov khoom siv tsim kho qhov hnyav txo thiab ua haujlwm ntev yog qhov tseem ceeb.
Cov hlau muab cov khoom siv kho kom zoo ib yam thoob plaws lub coil dav thiab ntev, kom ntseeg tau tias kev ua tau zoo hauv qhov xav tau ib puag ncig. Nws qhov sib npaug sib npaug tso cai rau kev tsim khoom yooj yim dua piv rau cov pa siab - lub zog steels, ua rau nws tus nqi - kev xaiv zoo rau kev siv cov qauv.
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