Abstract：Cold-rolled martensitic steel sheets, produced with continuous annealing lines with water quenching capacity, have the combination of high strength and lean alloying contents, which is in good accordance with the trend of light-weighting and fuel saving. The cold-rolled matensitic steel was studied to investigate the effect of the annealing parameters on the mechanical properties. It is found that the quenching temperature and the slow cooling speed as well as the overageing temperature have significant influence on the strength of the experimental steel. The temperature zone at which the austenite decomposition is slow or has not started may be chosen as the quenching temperature to ensure the stability of strength. Tempering decreases tensile strength while increases yield strength. Tempering between 200-300℃, the bending property maintains or increases and the reported deterioration of bending has not been observed at tempering temperatures above 240℃.
2012, Vol. 47 
