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HaiGang Yunyi
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Tianjin Haigang Steel Coil
Service first, quality assured. More dedicated and focused on crafting even better boards.
26
2021
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03
Annealing Process for Galvanized Strip Steel (Part 2)
Recrystallization stage
Once static recovery has progressed to a certain extent, as the annealing time is prolonged or the temperature is raised, the cold-worked sheet will experience a further and more rapid reduction in strength. This phenomenon is known as static recrystallization. Recrystallization is an important softening mechanism for eliminating work hardening; it also plays a crucial role in controlling grain size, grain morphology, and grain uniformity, and in either promoting or preventing preferred grain orientations. As such, recrystallization significantly influences the strength and toughness, hot strength, formability, and electromagnetic properties of annealed steel sheets.
Grain growth stage
After recrystallization is completed, when a hardened plate continues to be heated, grain growth occurs. Grain growth takes place through the movement of high-angle grain boundaries, resulting in some grains increasing in size while others shrink and eventually disappear. The size of grains significantly influences the properties of metals. In strip steel, alloying elements tend to segregate at grain boundaries; as grains grow, these grain boundaries have a tendency to move along with them. However, this movement is constrained by the diffusion rates of the alloying elements, thereby slowing down the migration of grain boundaries. When second-phase particles are present in the alloy, they also impede the migration of grain boundaries. The greater the volume fraction of second-phase particles and the finer their size, the stronger the resistance they exert on grain boundary migration. When the driving force for grain boundary migration equals the resistance imposed by the second-phase particles, grain boundary migration ceases, and the grain diameter reaches its limiting value. This principle is widely applied in industrial production to control grain growth in metals. By adding small amounts of aluminum, titanium, vanadium, and niobium to steel, fine particles of nitrides, carbides, or carbonitrides can be formed within the steel. These particles effectively prevent grain growth during high-temperature heating.
Strip steel, grain, recrystallization
We primarily produce various products including galvanized strip steel, pickled strip steel, and cold-rolled strip steel. These products are widely used in industries such as construction, mechanical manufacturing, automotive, and household appliances.
Contact usContact Information
Company address:
Shuangtang High-end Hardware Products Industrial Park, Jinghai District, Tianjin City
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Corporate email:
tjhaigang@tjhaigang.com
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