Finish Rolling Stage

Precise Control of Finish - Rolling Temperature: Finish rolling is a crucial part of the rolling process of high - strength shipbuilding steel plates. The most important thing is to control the finish - rolling temperature. The finish - rolling temperature is generally around 800 - 900℃. A lower finish - rolling temperature can refine the grains. This is because within this temperature range, the recrystallization process of the steel will be inhibited and new fine grains can be formed, thus improving the strength and toughness of the steel. In order to precisely control the finish - rolling temperature, it's necessary to monitor the temperature change during the rolling process in real - time and adjust parameters such as the rolling speed according to the temperature change. For example, if the temperature is found to be too high, the rolling speed may be appropriately increased to make the billets pass through the rolls as soon as possible and reduce heat absorption, so as to achieve the purpose of temperature reduction.

 

 

 

Finish Rolling with a Small Reduction Rate: The reduction rate in the finish - rolling stage is relatively small, usually between 10% - 20%. This is because the main purpose of the finish - rolling stage is to precisely control the dimensional accuracy and surface quality of the steel and further refine the grains. A smaller reduction rate can make the steel surface smoother and the dimensional accuracy higher. For example, for a steel with a thickness of 100mm after rough rolling, it may be finally rolled into a 50 - 80mm - thick shipbuilding steel plate in the finish - rolling stage, and both the surface quality and dimensional accuracy can meet high - standard requirements.

Cooling Stage

Application of Controlled - Cooling Technology: The cooling after rolling is also important for the performance of high - strength shipbuilding steel plates. The controlled - cooling (cooling control) technology is adopted to control the cooling speed according to different steel grades and product specifications. The main purpose of controlled - cooling is to enable the steel to obtain an ideal microstructure, such as bainite (B), acicular ferrite (AF), etc. These microstructures have relatively high strength and toughness. For example, for some shipbuilding steel plates that require relatively high strength and good low - temperature toughness, the microstructure can be refined through controlled - cooling to improve the performance in a low - temperature environment.

Influencing Factors of Cooling Speed: The cooling speed is affected by many factors, including the chemical composition of the steel, the thickness and the cooling medium. Steels with different chemical compositions have different phase - transformation temperatures and phase - transformation speeds, so they require different cooling speeds. Thicker steels have a relatively slower cooling speed because it takes longer for the internal heat to dissipate. The choice of cooling medium is also crucial. Common cooling media include air, water, oil, etc. Different cooling media have different cooling capacities. In actual production, it's necessary to comprehensively consider these factors and choose an appropriate cooling method and cooling speed to ensure that the steel obtains the best performance.

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We take pride in our ability to provide custom solutions for our customers' unique needs.
We analyze and compare the previous products and the current technical situation of our Hot Rolled Ah36 Steel Plate With ABS CCS Certificates and develop new technical specifications and processes.
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We offer a wide range of Cold-rolled Steel products to meet diverse customer needs.
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Our Cold-rolled Steel products are known for their durability and reliability.
Relying on the superior conditions and strong advantages of mass production, we are able to meet the different needs of our customers.

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