Dab tsi yog lub ntsiab lus Suav xa cov qauv rau cov hlau hloov?

Tus txheej txheem Suav thawj rau kub - rolled round steel yogGB / T 702 {-} 2016 "Kub-Rolled Round Hlau Thiab Square Steel"Cov. Nws qhia txog kev ua tiav rau qhov ntev (kab mob taub: ± 3% rau ib daim), tshuaj lom neeg (piv txwv li CURN0.22% rau Q235B, P / S≤0.035% Max), thiab cov kws kho tshuab (tensile lub zog 375 {{}} 500b, elongation ≥26%). Rau cold - Kos duab Hloov Hlau (xws li siv rau cov kev siv GB / {{[{h7 qib) thiab saum npoo (ra≤1.6μμμ Kev mob tus me nyuam suav nrog "kub-dov, raws li-xa tawm" (rau cov qib kev ua haujlwm zoo li 40cr) los ua kom zoo dua cov kev ua kom zoo dua qub.