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What is the difference between steel casting and iron casting?

2015-1-4 17:45:52      Click£º

What is the difference between steel casting and iron casting?

Iron casting usually refers to gray iron, ductile iron and malleable iron, which is iron

casting with carbon content upper than 2%.

Steel casting usually refers to normal carbon steel and alloy steel, or called steel casting

with carbon content lower than 2%.

Therefore, no big difference considering from the chemical content and raw materials for

cast iron vs cast steel. However, their physical properties have many differences.

The advantage and disadvantage of Iron casting.

The grey cast iron has good casting properties, good vibration damping, good wear

resistance, good machinability and low notch sensitivity. However, its tensile strength and

elongation are very low, so only can produce some metal parts with low physical

requirements, such as protective cover, cover, oil pan, hand wheels, frame, floor, hammer,

small handle, base,frame, box, knife, bed, bearing seat, table, wheels, cover, pump, valve,

pipe, flywheel,motor blocks etc.

As for the higher grades, grey cast iron can withstand greater load and a certain degree

of tightness or corrosion resistance of the more important castings such as cylinder, gear,

base, flywheels, bed, cylinder block, cylinder liner, piston, gear box, brake wheel, coupling

Plate, medium pressure valve, etc.

The ductile iron and malleable iron have high strength, ductility, heat-resistance and .

toughness, so a wider application, in some cases can replace the carbon steel. However,

its production technology is high, production process is more complex, and production

cost is higher than normal grey cast iron and cast steel, therefore, there are more casting

defects for ductile iron. There are many fields that ductile iron are using for, such as

Pressure pipes and fittings, Automotive applications, Agriculture, road and construction

applications, General engineering applications.

The advantage and disadvantage of steel casting.

One of the advantages of cast steel is the design flexibility, the designer of the casting

have the greatest freedom of design choices, especially the complex shape and hollow

cross-section parts.

Steel casting has the metallurgy manufacturing flexibility and strongest variability, you

can choose a different chemical composition and control, adapted to the various

requirements of different projects. By different heat treatment choice in the larger

context of the mechanical properties and performance, and good weldability and


Steel casting is a kind of isotropic material and can be made into the overall structural

strength steel castings, thereby improving the reliability of the project. Coupled with the

design and weight the advantages of short delivery time, price and economy has a

competitive advantage.

The weight range of steel castings is larger. Little weight can be only a few dozen grams

of molten mold precision castings, and the weight of large steel castings up to several

tons, dozens of tons or hundreds of tons.

Steel castings can be used for a variety of working conditions, and its mechanical

properties superior to any other casting alloys, and a variety of high-alloy steel for

special purposes.

To withstand high tensile stress or dynamic load of components, it is important pressure

vessel castings in low or high temperature by the large and important part load key parts,

in principle, should give priority to steel castings.

However, the steel casting has comparatively bad shake-suction, wear resistance, mobility

and the casting performance are compared bad with cast iron, moreover, the costs are

higher than normal cast iron.

Therefore, for iron casting vs cast steel, they have their own advantages and

disadvantages, you should choose it according to your application and their physical properties.