Nodulizer

Crystallizes into spherical additives, that is, the main component of spheroidizing agent is spheroidizing elements, such as Mg Ce Ca Spheroidal graphite in ductile cast iron is cast iron after spheroidizing treatment, make its intensity and much higher than the gray cast iron, toughness is better than that of malleable cast iron, but also to maintain a series of advantages of gray cast iron But to use when ductile iron casting nodularizer can increase weld tend to produce white and hardening organization, make the welding seam and heat affected zone (especially in the fusion zone) induced cracks Therefore, the weldability of nodular cast iron is worse than that of gray cast iron 

Cast iron casting field:

1、Magnesium content 4%, 5%, 5.5% are low magnesium spheroidizing agents, RE between 1% and 2%, mostly used for medium frequency furnace smelting, low sulfur liquid spheroidizing treatment. It has the advantages of mild spheroidization reaction and easy absorption of spheroidized elements.

2、Content of magnesium 6%, 7% is a magnesium series of spheroidizing agent, mainly used for cupola, electric furnace double smelting, or intermediate frequency furnace smelting pearlite shape as cast ductile iron castings. According to the casting wall thickness and the sulfur content of molten iron, the appropriate amount of spheroidizing agent was determined.

3、High magnesium series spheroidizing agent, suitable for cupola smelting, sulfur content 0.06%-0.09% of liquid iron, the addition of 1.6%-2.0%. 

4、Low aluminum spheroidizer is used in castings that are prone to subcutaneous porosity defects and castings that require aluminum content in molten iron. 

5、Spheroidizing agent produced by pure Ce and La has less inclusions in liquid iron after spheroidizing and spheroidizing. 

6、The spheroidizing agent produced by yttrium heavy rare earth is suitable for large section castings, delaying spheroidizing decline and preventing massive graphite. 

7、Spheroidizing agent containing Sb is used for pearlitic nodular cast iron. 

8、Low silicon spheroidizing agent is suitable for casting factories that use a large amount of recycle charge. 

9、Nickel-magnesium spheroidizing agent is used in high nickel austenitic ductile iron. 

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