CARBON-MANGANESE STEEL HAVING HIGH STRENGTH AND TENACITY BY EASY HEAT TREATMENT FOR STRUCTURAL MEMBER

摘要

as the material of parts with a cross-section from about 40 cm 2, after a hot forming by rolling, forging or pressing in endverformungstemperaturen or glu00fchtemperaturen up to about 1000 degrees c and then cooling in stationary or moving air, if necessary after controlled he cooling a ferritic - perlitisches structure containing about 5 to 20 ferriterest of pearlite and a stick or 0.2 - border of at least 580 n / mm 2 and a notch in terms of iso sub samples of at least 25 j considered, the use of a steel proposed within the following limits on zweckgerechter vote of individual substances under each other in analysis: 0.3 to 0.6 carbon, 0.2 to 0.6 silicon manganese, 0.55 to 2.5, 0,05 to 0.2 to 0.3 zircon vanadium, 0, 0 to 0.2 m, 0 to 0.5 cr, 0 to 0.5 nickel copper, 0 to 0.5, 0 to 0.3 molybdenum, 0.01 to 0.05% sulphur, 0 to 0.1 aluminium, 0.0005 to 0.005 boron, 0 to 0.04 nitrogen less than 0.0003 hydrogen, remainder iron and erschmelzungsbedingte verunreinig activity.