HOT-STAMPED MICRO-ALLOYED STEEL AND HOT-STEEL STEEL WITH EXCELLENT CROSSIBILITY FOR BREAKING AND PROCESSABILITY, AND A ITEM MADE OF HOT-STAMPED MIKROLIGAN

摘要

1. Hot stamped microalloyed steel with excellent breakability at break and workability, containing, wt.%, C: from more than 0.35 to 0.60, Si: from 0.50 to 2.50, Mn: from 0.20 to 2 , 00, P: from 0.010 to 0.150, S: from 0.040 to 0.150, V: from 0.10 to 0.50, Zr: from 0.0005 to 0.0050, Ca: from 0.0005 to 0.0050, and N: from 0.0020 to 0.0200 with a limit Al content of less than 0.010, and the rest, mainly Fe and inevitable impurities. ! 2. The hot stamped microalloyed steel according to claim 1, additionally containing one or more of the elements, wt.%, Cr: from 0.05 to 0.25, Nb: from 0.005 to 0.050, and Ti: from 0.005 to 0.050. ! 3. The hot stamped microalloyed steel according to claim 1 or 2, additionally containing Mg: from 0.0005 to 0.0050 wt.%. ! 4. Hot-rolled, hot-stamped microalloyed steel with excellent fissility at break and workability, having the composition according to any one of claims 1 to 3, in the structure of which the number of MnS inclusions with a width of 1 μm or more in 1/4 of the diameter of the hot-rolled steel is 10% or less (including 0%) of the total number of MnS inclusions in steel, and the average aspect ratio of MnS inclusions is 10 or less. ! 5. Hot stamped microalloy steel with excellent breakability at break and workability, having the composition according to any one of claims 1 to 3, the structure of which contains a bainitic fraction in an amount of 3% or less (including 0%), and the rest is ferrite / perlite.