What Is Ductile Iron?
The development of nodular cast iron began in the 1950s. In 1947, H. Morrogh found that adding cerium to hypereutectic gray cast iron could make graphite spherical. Ductile iron precipitates carbon as spherical graphite during the solidification process, thereby avoiding the existence of sharp graphite in gray cast iron and significantly improving the strength utilization rate of the metal matrix, reaching 70-90%
How to deal with Ductile Irond?
1
Stress relief heat treatment
Heat the casting to the required temperature range, and the holding time is calculated based on the wall thickness (1+1h/25mm). Then it is reduced to 250 ° C in the kiln at a rate of 20 - 40 ° C/h. Finally, you can choose kiln cooling or air cooling.
2
Annealing:
Stress relief annealing is the same as gray cast iron, and the purpose is to reduce residual stress; the purpose of low-temperature annealing and high-temperature annealing is to decompose the carburite in the organization to obtain ferritic nodular cast iron, improve plasticity and toughness, and improve machining performance
3
Normalizing
The purpose is to increase the amount of pearlite in te matrix or obtain a matrix of all pearlite, refine the grains, and improve the strength and wear resistance of the casting.
4
Conditioning
5
Austempering
6
Mechanical processing:
Main Properties of Nodular Cast Iron
1. The tensile strength can reach 1400MPa, close to steel.
2. The elongation of treated nodular cast iron can reach 24%
3. Good casting performance and relatively low cost.
3. It has been successfully used to manufacture various parts with complex stresses and high requirements for strength and toughness, partially replacing cast steel and forged steel.
Application Industry
Agricultural Machinery
Automobile
Railway Transportation
Problems with Ductile Iron Casting Services
1. What casting process do you use to produce ductile iron parts?
We adopt a variety of processes such as lost wax casting, sand casting, and shell casting.
2. What types of services do you provide?
We can not only provide you with pre-purchase suggestions, but also resolve your inquiries and concerns in a timely manner.
