Method for casting nodular cast iron with large section
A technology of nodular cast iron and large cross-section, which is applied in the casting field of large-section nodular cast iron. It can solve the problems of anti-spheroidization decline and poor graphite distortion ability, and achieve the effect of improving nodularization and solving graphite distortion.
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[0010] The casting method of large-section nodular cast iron of the present invention, specific embodiment is as follows:
[0011] Add coke, limestone, scrap steel, newborn iron, returned iron, and ferroalloy in the order of smelting materials, and cycle in turn until the bottom edge of the material mouth is added. The total weight of various metal layers is 500 kg, and the thickness of each layer of coke The amount of coke added is based on the height that can make up the bottom of the coke. Limestone is added to the center of the furnace, and the added weight is 30% of the coke weight. After the furnace material is installed, preheat for 20 minutes and start blasting. During the blasting process, observe and control the combustion status in the furnace through the peephole of the tuyere. According to the batch of feeding materials, when the amount of iron is met, prepare for tapping, and prepare for spheroidizing treatment, first according to the requirements Required, load ...
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