Dab tsi yog cov khoom tseem ceeb (yield zog, tensile zog, elongation) rau Q355B kuv-beams?

Cov khoom siv kho tshuab tsim cov qauv kev ua haujlwm tseem ceeb rau Q355B I-beams, raws li tau teev tseg hauv GB/T 1591-2018 thiab seem seem txheem GB/T 706-2016 (rau cov ntu kub dov). Cov khoom tseem ceeb tshaj plaws yog Yield Strength (ReH lossis Rp0.2), Tensile Strength (Rm), Elongation tom qab Fracture (A), thiab Impact Toughness (KV2 ntawm 20℃rau Qib B). Lub zog tawm los yog qhov kev ntxhov siab uas cov khoom pib deform plastically; rau q355byam tsawg kawg nkaus yield strength is 355 MPa but only for nominal thicknesses ≤ 16mm. It's crucial to note that the minimum yield strength decreases for larger thicknesses due to slower cooling rates during rolling, which results in a coarser microstructure. For example, for thicknesses >16 to 40mm, it's ≥ 345 MPa; >40 to 63mm, ≥ 335 MPa; >63 to 80mm, ≥ 325 MPa; >80 to 100mm, ≥ 315 MPa; >100 to 150mm, ≥ 305 MPa; and >150 txog 250mm, Ntau dua lossis sib npaug li 285 MPa. Tensile zog (Rm) yuav tsum nyob nruab nrab ntawm 470 mus rau 630 MPa rau tag nrho cov thickness ranges mus txog 250mm, kom ntseeg tau ib tug txaus margin saum yield zog. Elongation (A), ntsuas ntawm tus qauv xeem daim, feem ntau Zoo dua los yog sib npaug rau 20-22% (nyob ntawm thickness thiab xeem daim ntawv), qhia tau hais tias zoo ductility. Rau Q355B, Charpy V-notch cuam tshuam lub zog ntawm +20℃yuav tsum siab dua lossis sib npaug rau 34J. Cov khoom no raug txheeb xyuas los ntawm kev puas tsuaj ntawm cov qauv coj los ntawm lub vev xaib lossis flange ntawm I-beam.

* Table: Cov Khoom Tseem Ceeb ntawm Q355B Steel (GB / T 1591-2018) *