Method for producing nodular cast iron from low-manganese steel scrap accessories

Abstract

The invention discloses a method for producing nodular cast iron from low-manganese steel scrap accessories. The method comprises the steps as follows: low-manganese steel scrap, recirculated iron andadditives are matched in percentage by weight, and the additives include a nodulizer, 75SiFe and a carburant and are added as per the percentage of the total weight of the low-manganese steel scrap and the recirculated iron; the recirculated iron, the carburant and the low-manganese steel scrap are sequentially added to an electric medium-frequency induction furnace, heating is stopped after thetemperature rises to 1,500-1,530 DEG C, and slag is cleaned through raking; the nodulizer and 75SiFe are sequentially placed into a nodulizing ladle reaction chamber, and the chamber is covered with an upper cover; the molten iron discharging temperature is controlled to be 1,520+ / -10 DEG C, molten iron in the electric furnace is poured into the nodulizing ladle reaction chamber from a liquid inlet in the upper cover, and the nodulizing reaction time is controlled to range from 60 s to 120 s; the pouring temperature is controlled to range from 1,390 DEG C to 1,410 DEG C, and pouring is performed in a manufactured sand mold cavity. The method has the beneficial effects as follows: produced castings have the good density; the method is convenient to operate and master; the production cost can be reduced; the low-manganese steel scrap has the stable source and is convenient to buy, resources can be saved, and the energy consumption can be reduced.

Description

technical field [0001] The invention relates to a production process, in particular to a method for producing nodular cast iron with low-manganese scrap steel batching. Background technique [0002] Ductile iron is a high-strength cast iron material whose comprehensive performance is close to that of steel. Its excellent performance has been successfully used to cast some parts with complex stress, high strength, toughness and wear resistance. It is a widely used cast iron. Material. At present, there are many ways to produce ductile iron, but most of them use pig iron ingredients for casting to produce ductile iron. The existing problems are as follows: [0003] 1. Usually Q10 is used # Pig iron ingredients are used to produce nodular cast iron, and the source of Q10# pig iron is limited, so the purchase cost is relatively high; [0004] 2. Desulfurization process is required in the production of Q10# pig iron ingredients, which increases the production cost; [0005] 3...

AI Technical Summary

Problems solved by technology

[0003] 1. Usually Q10 is used # Pig iron ingredients are used to produce nodular cast iron, and the source of Q10# pig iron is limited, so the purchase cost is relatively high;

[0004] 2. Desulfurization process is required in the production of Q10# pig iron ingredients, which increases the production cost;

[0005] 3. The castings produced by Q10# pig iron ingredients have coarse grain size and poor density