Heat - Conduction Path Length: The particle size also affects the length of the heat - conduction path. The heat - conduction path inside the large - particle - size raw materials is longer, and it takes a longer distance for heat to transfer from the surface to the center. For example, for a block - shaped raw material with a diameter of 50mm, it may take a long time for heat to transfer from the surface to the center because there will be a certain loss of heat during the transfer process. However, for the raw materials with a smaller particle size, such as particles with a diameter of 5mm, the heat - conduction path is short, and heat can reach the center more quickly, enabling the entire raw material particle to reach the melting temperature more quickly and improving the heat - transfer efficiency.

 

 

Grade	Mechanical Property
	Tensile Strength(MPa)	Yield Strength(MPa)	% Elongation in 2 in.(50mm) min	Impacting Test Temperature(°C)
CCS AQ47	400-520	235	22	20

 

 

 

 

 

 

Influence of Shape on Heat - Transfer Efficiency

 

Difference in Heating Area: The raw materials with irregular shapes usually have a larger heating area than the spherical or regularly - shaped block - shaped raw materials. For example, the scrap steel with more edges and corners or in the form of thin sheets has smaller gaps between each other when stacked in the furnace and can be arranged more closely. In this way, when the high - temperature gas or flame passes through the raw material pile, it will come into contact with more surfaces of the raw materials. In electric - arc - furnace steel - making, the irregular - shaped scrap steel can make better use of the heat generated by the electric arc because the heat generated by the electric arc can be more widely distributed on the surfaces of these irregular - shaped scrap steel, while the spherical or regularly - shaped block - shaped raw materials may only have part of the surface to effectively receive heat. Therefore, the heat - transfer efficiency of the irregular - shaped raw materials is higher in this case.

 

Heat - Flow Distribution: The shape of the raw materials also affects the distribution of heat flow inside them. For the regularly - shaped raw materials, such as spherical particles, the distribution of heat flow inside them is relatively uniform. However, for the raw materials with complex shapes, such as the scrap steel with holes or wrinkles, the distribution of heat flow inside them will be more complex. When heat is transferred to these irregular - shaped raw materials, local heat accumulation will be formed in the holes, wrinkles and other parts, making the temperature of these parts rise more quickly. To a certain extent, this non - uniform heat - flow distribution can also speed up the melting speed of the raw materials because the local high - temperature areas can reach the melting temperature more quickly, and then drive the melting of the entire raw material, improving the heat - transfer efficiency. However, if the shape is too complex, it may lead to an overly non - uniform heat - flow distribution, resulting in problems such as local overheating and affecting the stability of the steel - making process and the quality of steel products.

 

 

 

 

 

 

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