A method for manufacturing a hot rolling mill roll by laser cladding a reusable steel axe substrate having a rotational symmetry axis with a metal coating external layer, said metal coating external layer having a work tool steel composition, comprising the steps of: - rotating the reusable substrate around its axis of rotational symmetry; - effecting a laser cladding on the rotating substrate, by forming a melt pool on the surface of the rotating substrate by means of a laser beam and affixing the coating layer by feeding a powder material into the laser-induced melt pool; - submitting the coated substrate to a post-cladding thermal treatment; wherein the composition for said metal coating external layer comprises 0.5-3.5% C, 2-18% Cr, 0.5-7% Mo, 0.5-8% V, 0.2-7% W, 0-5% Nb, 0-1% Ti, 0.5-2% Mn, 0.2-3% Si and 0-3% Ni, the rest being Fe and inevitable impurities; wherein a preheating of the substrate is performed by a coating head combining induction heating with laser cladding process; wherein the cladding rate is in the range from 2.35 kg/h to 18 kg/h; and wherein said external coating layer is made of multiple added coated sublayers and has a total thickness comprised between 1 and 30 mm, the thickness of each single external coating sublayer being comprised between 0.1 and 2.5 mm, characterised in that it further comprises the following steps: - selecting a composition for said metal coating external layer that further comprises nitrogen in the range 200-2500 ppm, so as to increase abrasion resistance and in which the sum of atomic contents (mass %) of MC carbides forming elements, selected from the group consisting of Ti, Nb, and V, + 3/8 of the sum of atomic contents (mass %) of M 23 C 6 and/or M 2 C forming elements, selected from the group consisting of Mo, W, and Cr, is lower than the sum of atomic contents (mass %) of interstitial elements C and N, + 0.01, so as to achieve homogeneous hardness in case of a multilayer coating; - drying or heating the powder used for cladding, controlling strictly ambient humidity and performing cladding process under a controlled protecting atmosphere, so as to obtain a final hydrogen content in the metal coating external layer lower than 1ppm, permitting to suppress cracks. - rotating the reusable substrate around its axis of rotational symmetry; - effecting a laser cladding on the rotating substrate, by forming a melt pool on the surface of the rotating substrate by means of a laser beam and affixing the coating layer by feeding a powder material into the laser-induced melt pool; - submitting the coated substrate to a post-cladding thermal treatment; wherein the composition for said metal coating external layer comprises 0.5-3.5% C, 2-18% Cr, 0.5-7% Mo, 0.5-8% V, 0.2-7% W, 0-5% Nb, 0-1% Ti, 0.5-2% Mn, 0.2-3% Si and 0-3% Ni, the rest being Fe and inevitable impurities; wherein a preheating of the substrate is performed by a coating head combining induction heating with laser cladding process; wherein the cladding rate is in the range from 2.35 kg/h to 18 kg/h; and wherein said external coating layer is made of multiple added coated sublayers and has a total thickness comprised between 1 and 30 mm, the thickness of each single external coating sublayer being comprised between 0.1 and 2.5 mm, characterised in that it further comprises the following steps: - selecting a composition for said metal coating external layer that further comprises nitrogen in the range 200-2500 ppm, so as to increase abrasion resistance and in which the sum of atomic contents (mass %) of MC carbides forming elements, selected from the group consisting of Ti, Nb, and V, + 3/8 of the sum of atomic contents (mass %) of M 23 C 6 and/or M 2 C forming elements, selected from the group consisting of Mo, W, and Cr, is lower than the sum of atomic contents (mass %) of interstitial elements C and N, + 0.01, so as to achieve homogeneous hardness in case of a multilayer coating; - drying or heating the powder used for cladding, controlling strictly ambient humidity and performing cladding process under a controlled protecting atmosphere, so as to obtain a final hydrogen content in the metal coating external layer lower than 1ppm, permitting to suppress cracks. - selecting a composition for said metal coating external layer that further comprises nitrogen in the range 200-2500 ppm, so as to increase abrasion resistance and in which the sum of atomic contents (mass %) of MC carbides forming elements, selected from the group consisting of Ti, Nb, and V, + 3/8 of the sum of atomic contents (mass %) of M 23 C 6 and/or M 2 C forming elements, selected from the group consisting of Mo, W, and Cr, is lower than the sum of atomic contents (mass %) of interstitial elements C and N, + 0.01, so as to achieve homogeneous hardness in case of a multilayer coating; - drying or heating the powder used for cladding, controlling strictly ambient humidity and performing cladding process under a controlled protecting atmosphere, so as to obtain a final hydrogen content in the metal coating external layer lower than 1ppm, permitting to suppress cracks.