The difference between cast iron and cast steel gate valves

The good casting properties of gray cast iron are good vibration damping, good wear resistance, good machinability and low notch sensitivity. However, its tensile strength and elongation are low.
Therefore, it can only produce some metal parts that do not have high physical requirements. Protective cover, cover, oil pan, handwheel, frame, floor, hammer, small handle, base, frame, box, knife, bed, bearing seat, workbench, wheel, cover, pump, valve, pipe, flywheel, motor Seat and wait. As for higher grade gray cast iron, it can withstand larger loads and has certain sealing or corrosion resistance. This allows for some of the more important castings such as cylinders, gears, bases, flywheels, beds, cylinder blocks, cylinder liners, pistons, gearboxes, brake wheels, coupling plates, medium pressure valves, etc.

Ductile iron and malleable iron have high strength, ductility, heat resistance and toughness. So for a wider range of applications, in some cases, it can replace carbon steel. However, its production technology is very high. The production process is more complicated. This makes production costs higher than ordinary gray cast iron and cast steel.

Therefore, ductile iron has many casting defects. There are many areas where ductile iron is used, such as pressure pipes and fittings, automotive applications, agriculture, road and construction applications and general engineering applications.

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Advantages and disadvantages of cast steel:

The main advantage of cast steel is design flexibility. Casting designers have maximum freedom of design choices. This allows for complex shapes and hollow cross-section parts.

Cast steel offers the flexibility and greatest variability of metallurgical manufacturing. Different chemistries and controls can be chosen to suit the various requirements of different projects. This provides different heat treatment options within a wider range of mechanical properties and properties. Also provides good weldability and workability.

Cast steel is an isotropic material that produces monolithic structural strength steel castings. This increases the reliability of the project. Together with design and weight, short delivery times, price and economical advantages give cast steel a competitive advantage.

Steel castings are available in a wider range of weights. A very small weight can be an investment casting weighing only tens of grams. Large steel castings can weigh several, tens or hundreds of tons.

Steel castings can be used in a variety of working conditions. Its mechanical properties are superior to any other casting alloy, as well as various special-purpose high-alloy steels. In order to withstand high tensile stresses or dynamic loads on components, it is important to consider pressure vessel castings. At low or high temperatures, large and important parts with critical load parts should be mainly made of steel castings.
However, cast steel has poor shock absorption, wear resistance and fluidity. Casting properties are poor compared to cast iron. Additionally, the cost is higher than regular cast iron.

So, when it comes to cast iron vs. cast steel, they each have their pros and cons. The selection should be based on the application and their physical properties.

Identification of castings and forgings:

① Depending on the fineness of the surface structure of the forging, the surface of the casting should be coarser, while the machined surface of the forging should be brighter.

② The cast iron section is gray and dark, while the forged steel section is silver and bright.

③ Listen to the sound, the forging is dense, the sound is crisp after impact, and the sound of the casting is dull.

④ Use a grinder to grind it and see the difference in sparks between the two (the brightness of the forging), etc.

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