| 摘要 |
The invention relates to a steel strip having a hot dip zinc based coating, the steel strip having the following composition, in weight%,: C: 0.17 - 0.24 Mn:. 1.8 - 2.5 Si: 0.65 - 1.25 Al: = 0.3 optionally: Nb: = 0.1 and/or V: = 0.3 and/or Ti: = 0.15 and/or Cr: = 0.5 and/or Mo: = 0.3, the remainder being iron and unavoidable impurities, with a Si/Mn ratio = 0.5 and a Si/C ratio = 3.0, with an Mn equivalent ME of at most 3.5, wherein ME = Mn + Cr + 2 Mo (in wt.%) having a microstructure with (in vol.%): ferrite: 0 - 40 bainite: 20 - 70 martensite: 7 - 30 retained austenite: 5 - 20 pearlite: = 2 cementite: = 1 having a tensile strength in the range of 960 - 1100 MPa, a yield strength of at least 500 MPa, and a uniform elongation of at least 12%. |
