Heating method of a metallic product

A method for heating a semi-finished steel product, the semi-finished steel product being a slab, a billet or a bloom, the method comprising:

• a pre-heating step performed in a pre-heating device having a chamber containing solid particles, a heat exchanger, a support able to support the semi-finished steel product, and a gas injector;
• and
• a heating step performed in a furnace, wherein the semi-finished steel product is heated to a temperature from 1000 to 1400° C.;
• a hot rolling step, after the heating step, wherein the semi-finished steel product is hot rolled;
• the pre-heating step including the steps of:
• i. injecting a gas into the first chamber so as to form a first fluidized bed;
• ii. heating the fluidized bed via said heat exchanger;
• iii. putting the semi-finished steel product into the fluidized bed such that the semi-finish steel product is supported by said support 6 and such that the fluidized bed is able to transfer heat to said semi-finished steel product;
• and
• iv. taking out the semi-finished steel product when a temperature of the semi-finished steel product is from 200° C. to 1000° C.

A method for heating a semi-finished steel product, the semi-finished steel product being a slab, a billet or a bloom, the method comprising:

• a heating step performed in a heating device having a chamber containing solid particles, a heat exchanger, a support able to support the semi-finished steel product, and a gas injector;
• and
• a rolling step performed in a rolling mill,
• the heating step including the steps of:
• i. injecting a gas into the first chamber so as to form a first fluidized bed;
• ii. heating the fluidized bed via said heat exchanger;
• iii. putting the semi-finished steel product into the fluidized bed such that the semi-finish steel product is supported by said support 6 and such that the fluidized bed is able to transfer heat to said semi-finished steel product;
• and
• iv. taking out the semi-finished steel product when a temperature of the semi-finished steel product is from 150° C. to 350° C., and
• the rolling step including the step of rolling the semi-finished steel product at a temperature from 150 to 300° C.