ABS AH32 Shipbuilding Steel Plate

Reasonably Controlling the Heating Process Parameters

Controlling the Heating Rate

Principle: Appropriate control of the heating rate of steel can reduce decarburization. If the heating rate is too fast, the temperature difference between the surface and the interior of the steel will increase, leading to an accelerated diffusion rate of carbon on the surface. At the same time, it will also make the reaction between the steel surface and the surrounding atmosphere more intense, increasing the possibility of decarburization. However, slow heating can make the temperature of the steel rise evenly inside and outside, reducing the uneven diffusion of carbon and oxidation reactions.

Application Case: During the heating process of large - scale forgings, a relatively low heating rate is usually adopted. This can make the internal structure of the steel heated uniformly, avoiding the decarburization phenomenon caused by local overheating and ensuring the quality of the forgings.

 

 

 

Controlling the Heating Time and Temperature

Principle: The speed of the decarburization reaction is closely related to temperature and time. At high temperatures, the decarburization reaction speed will accelerate; as the heating time is prolonged, the degree of decarburization will also deepen. Therefore, reasonable control of the heating temperature and time is the key to preventing decarburization. On the premise of meeting the heat - treatment requirements of the steel, minimizing the heating temperature and shortening the heating time as much as possible can effectively reduce decarburization.

Application Case: In the quenching process of ordinary carbon steel, according to the specific composition and size of the steel, the quenching temperature and the residence time in the furnace are precisely controlled to prevent decarburization. For example, by controlling the quenching temperature within a reasonable range and shortening the residence time in the high - temperature furnace, decarburization can be minimized while ensuring the quenching effect of the steel.

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