| 摘要 |
<p>Summary Method for heating metal materials, such as a slab or a billet (3), using at least one DFI burner (1). The invention is characterized in that the heating power of the flame (10) of the DFI burner (1) is pulsated in cycles, so that the heating power is alternated between at least two different, predetermined powers, where each predetermined power, respectively, is maintained during a certain predetermined time period, where some powers are made to be lower than others, in that the powers are made to be low enough, and the time periods are made to be short enough, so that the combination of the powers and their corresponding time periods results in that the surface of the metal slab (3) is not heated above a certain, predetermined limit temperature during the time periods of the higher powers, in that this pulsating heating of the metal material (3) is interrupted when a certain stop condition is fulfilled, and in that the metal material (3) thereafter is heated to another predetermined, final, homogenous temperature by the use of another, conventional heating method.</p> |
