The raw materials used in the production of ASTM A516GR70+N thick steel plates are flat ingot, blooming slab, continuous casting slab, forged billet and die-casting billet etc.. Flat ingot and blooming slab have been used for a long time. But with the development of continuous casting technology, the continuous casting slab becomes popular for production of ASTM A516GR70+N thick steel plates. This can not only improve the yield of ASTM A516GR70+N thick plate production and reduce the cost, but also improve the quality of ASTM A516GR70 normalizing thick plate under the condition of sufficient compression ratio. If there is no slab and slab ingot available for raw materials, the forging and casting billets are used as raw materials only in the production of special ASTM A516GR70+N thick steel plates.
The heating furnace for ASTM A516GR70+N thick steel plates are continuous heating furnace, chamber furnace and soaking pit etc.. Soaking pit is mainly used to roll raw materials of ASTM A516GR70+N special thick steel plates such as steel ingot. Chamber furnace is for super heavy or super light and super short slab, as well as more varieties but small quantities and alloy steel billet and ingot. Continuous heating furnace is suitable for less variety mass production.
In recent years, ASTM A516GR70+N thick steel plates continuous reheating furnace are mainly hot slide or walking beam type. The modern ASTM A516GR70+N thick plate continuous heating furnace has developed to large capacity, long life, high yield, high quality, pollution-free and operation automation, so as to optimize the thermal system. The purpose of heating is to improve the plasticity of metal, reduce its deformation resistance and meet the requirements of rolling process. By adjusting the heating system, such as heating temperature, heating time, heating speed, etc. , to ensure that ASTM A516GR70+N thick steel plates slab temperature is uniform and prevent the heating defects.
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