Mill shafts
AssigneeAçOforja Industria De Forjados S/A
InventorCarlos Antonio COELHO
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Abstract
The present invention belongs to the field of mechanical engineering and materials, more specifically in the metallurgy segments, for application in the sugar industry. The invention relates to the hot forging process of mill shafts and heat-treated auxiliary equipment in CrNiMo and low carbon alloy. The shafts and auxiliary equipment manufactured according to this invention have a long service life, thus reducing downtime for maintenance and increasing reliability, since it eliminates the problems associated with cracks and instantaneous fractures. As a consequence, there is a reduction in the risks of accidents and production losses associated with stoppages.
Claims14
Low alloy steel based on Chromium-Nickel-Molybdenum, characterized in that it comprises the following chemical composition in mass percentage:
- 0.28 to 0.33% C;
- 0.50 to 0.60% Mn;
- 0.15 to 0.35% Si;
- 0.80 to 1.10% Cr;
- 0.15 to 0.25% Mo;
- 0.35 to 0.50% Ni;
- an amount of less than 0.025% of P;
- an amount of less than 0.025% of S;
- an amount of less than 0.35% of Cu;
- an amount of less than 0.35% of V;
- and a maximum of 3.0 PPM of H.
Dependencies are inferred from the claim text.