S355J2 steel plate delivery status: steel plate to hot rolled, control tie, normalized and other state delivery.
1, hot rolling: hot rolling (hot rolling) is relative to cold rolling, cold rolling is carried out in the recrystallization temperature below the rolling, and hot rolling is carried out in the recrystallization temperature above the rolling. Simply put, a piece of billet in the heating after a few rolling, and then cut edge, corrected to become a steel plate, this is called hot rolling.
2, control rolling, by controlling the heating temperature, rolling temperature, deformation system and other process parameters, control the austenite organization of the law of change and the organization of the phase transition products, to achieve the purpose of refining the organization, improve strength and toughness.
3, the concept of normalizing rolling is a rolling method of final deformation within a certain temperature range. It can make the state of the material with the same supplemental normalizing treatment, the mechanical properties of the specified value is also the same as the supplemental normalizing.
4, normalizing is the steel is heated to the normalizing temperature after air cooling, so that its organizational structure becomes dense and uniform, enhanced the hardness, strength and wear resistance of steel, applicable to the need for higher hardness and wear resistance of steel. This treatment is usually used in machine tools, tools and other applications that require high strength, hardness and wear resistance.
