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Ductile iron cover components and characteristics


Pig iron is more than 2% carbon content of iron and carbon alloy, industrial pig iron carbon content is generally 2.5% - 4%, and with C, SI, Mn, S, P and other elements, is the iron ore by blast furnace smelting product. According to the different forms of carbon in the pig iron, can be divided into steel pig iron, cast iron and ductile iron and several.

Precipitated graphite is cast iron. The effect of spherical graphite on the metal matrix is smaller than that of the flake graphite, so that the strength of the cast iron reaches 70 ~ 90% of the matrix strength, the tensile strength is up to 120kgf / mm2, and has good toughness. Ductile iron outside the chemical composition of iron is usually: carbon content of 3.6 to 3.8%, silicon content of 2.0 to 3.0%, containing manganese, phosphorus, sulfur does not exceed 1.5% of the total amount of rare earth, magnesium and other ball agent.


Ductile iron covers are mainly made of ductile iron out of the covers, the quality of this well covers the ball to the rate of the problem. Processing castings commonly used paint is rust-proof asphalt paint, of course, the surface of the ductile iron covers are also treated by spraying rust-proof asphalt paint. Ductile iron covers have an advantage, is due to ductile iron high strength, good toughness, making the ductile castings than the same type of gray cast iron covers light about 30%.

Ductile iron covers Features:

Good toughness. Impact value and carbon steel in detail, gray iron material is more than 10 times.

Strong corrosion resistance. Water corrosion test, ninety days of corrosion is only 1/40 of the steel, gray iron pipe is 1/10. Life is gray iron pipe 2 times, 5 times the ordinary steel pipe.

Good plasticity. Elongation ≥ 7%, similar to high-carbon steel, and gray iron material elongation is zero.

high strength. Tensile strength ób ≥ 420MPa, yield strength ós ≥ 300MPa, and low carbon steel is the same, three times the gray iron material.

Due to the microstructure of nodular graphite in ductile iron, ductile iron is superior to cast steel in reducing the vibration capacity, so it is more beneficial to reduce the stress. One of the important reasons for choosing ductile iron is that ductile iron is less expensive than cast steel. The low cost of nodular cast iron makes this material more popular, casting more efficient, and less ductile iron machining costs.

The strength of ductile iron and the strength of cast steel are comparable. Ductile iron has a higher yield strength, the yield strength of the lowest 40k, while the yield strength of cast steel is only 36k. In most municipal applications, such as: water, salt water, steam, ductile iron corrosion resistance and oxidation resistance are more than cast steel.


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