Casting nodulizer

In the industrial field, nodulizer is one of the lighter structural metal materials, which is favored in the market due to its high specific stiffness, good damping and processability, and easy recycling. Adding nodulizer  In some metals or alloys in the molten iron to obtain spherical iron, the commonly used nodulizer is ferrosilicon rare earth magnesium nodulizer . What are the components in the nodulizer ? Professional casting old driver tells you the truth!

Low-aluminum nodulizer is used in castings that are prone to subcutaneous pore defects and castings that require molten aluminum. The nodulizer made of pure Ce and pure La, after the spherical treatment of molten iron, the pure mixture is less, the stone The ink ball is rounded. The nodulizer  produced by ferrosilicon 0 rare earth is suitable for large-section castings, can delay spheroidization and prevent block graphite, and contains Sb nodulizer  for pearlescent main ductile iron. Low-silicon nodulizer  is used. Casting workshop, which uses a large amount of recyclable materials, nickel-magnesium nodulizer for ferrosilicon 1 spheroidal graphite cast iron.

The main component of the reagent is spheroidized elements, such as Mg, Ce, Ca, etc. The spherical stones in the ductile iron ink are made of cast iron liquid after spheroidization, which makes the strength much higher than gray cast iron. It has better toughness than malleable cast iron and can maintain a series of advantages of gray cast iron. However, the nodulizer used for cast iron casting will increase the tendency of the weld to produce "white mouth" and harden the structure, thus in the weld and heat. Cracks occur in the affected area (especially in the fusion zone), and the weldability of ductile iron is worse than that of gray cast iron. Therefore, the nodulizer commonly used in many fields is 00-1 rare earth magnesium alloy, and most of the foreign countries use magnesium nodulizer  ( Pure magnesium and magnesium alloys, while in China, very few, using calcium nodulizer .

Magnesium content is 4%, 5% and 5.5% are low-magnesium nodulizer, and RE is between 1% and 2%. It is mainly used for medium-frequency furnace smelting and smelting of low-sulfur iron liquid. It has a spherical response to warmth. And the spherical elements are easy to enrich and absorb the strength. 6% and 7% of magnesium are medium magnesium series nodulizer , mainly used for double smelting of cupola and electric furnace, or intermediate frequency furnace smelting pearlite main casting ductile iron castings, according to castings The wall thickness and the sulphur content of the original molten iron are sufficient to determine the amount of nodulizer  to be satisfied. The scope of application is wide, and the spheroidizing treatment process is also extensive. The high-magnesium series nodulizer  is suitable for cupola. In the smelting, the sulfur content is 0.06%-0.09% of the molten iron, and the participation amount is between 1.6% and 2.0%.

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