Method of manufacturing toles of steel has two phases having a resistance to traction high and an elastic limit / resistance to traction of small value, as well as excellent properties of ageing after work, and thus obtained product

摘要

P the process according to the invention comprises the hot rolling of a steel containing between 0,03 and 0,13% of carbon, between 0,8 and 1,7% of manganese, not more than 0,1% of aluminum, not more than 2,0% of silicon and not more than 0,5% of chromium, the temperature of the finishing being between 750°C. and 890 degrees c, the rapid cooling of the band up to a temperature not above 230°C, and the winding of the strip at a temperature not above 230°C, the variation in temperature between the start and end of the coil does not exceed 100°C. the silicon content is limited to 1% or less in applications where the ability to the paint is high and is limited to 1 to 2% in applications where the ductility is important. The method makes it possible to improve the properties of the artificial aging, which is uniform over the entire length of the coiled strip. / p