Botou Junteng Casting Co.,Ltd

Ductile iron is a high-strength cast iron material developed in the 1950s. Its comprehensive performance is close to that of steel. It has been successfully used to cast some parts with complex stress, high strength, toughness and wear resistance. It is precisely because nodular cast iron is a high-strength cast iron material, there are many matters needing attention in the production process of nodular cast iron. The   cast iron parts factory china  to share with you. There are 6 main points for producing ductile iron: 1. The chemical composition is strictly required. The carbon and silicon content of the original molten iron is higher than that of gray cast iron, and the content of manganese, phosphorus and sulfur in nodular cast iron is reduced. 2. The temperature of the molten iron is higher than the gray cast iron to compensate the nodulization and the loss of the molten iron temperature during the inoculation process. 3. Perform spheroidizing treatment, that is,...

The application of nodular cast iron manhole covers has played a very important role in the municipal construction of our city. The appearance of many different types of nodular cast iron manhole covers has provided us with several conveniences. Now let the  aluminum electric motor shell supplier  introduce to you the characteristics of nodular cast iron manhole covers. Good toughness. The impact value is detailed with medium carbon steel, which is more than 10 times that of gray iron material. Strong corrosion resistance. In the water spray corrosion test, the amount of corrosion in the 90-day period is only 1/40 of the steel pipe, which is 1/10 of the gray iron pipe. The service life is 2 times that of gray iron pipes and 5 times that of ordinary steel pipes. Good plasticity. The elongation is ≥7%, which is similar to that of high-carbon steel, while the elongation of gray iron materials is zero. high strength. Tensile strength ób≥420MPa, yield strength ós≥300M...

Ductile iron parts as shaft parts require comprehensive mechanical properties with high strength and good toughness. The process is: the cast iron is heated to a temperature of 860-900 ° C to keep the matrix austenitized, and then cooled in oil or molten salt to achieve quenching, and then tempered at 500-600 ° C to obtain a tempered sorbite structure. (Generally, there is still a small amount of massive ferrite), the shape of the original spherical graphite does not change. After processing, the strength and toughness are well matched, which is suitable for the working conditions of shaft parts. Ductile Iron Lamp Post Due to various factors,  ductile iron lamp post  often has defects such as pores, holes, slag inclusions, cracks, and pits. Common repair equipment is argon arc welding machine, resistance welding machine, cold welding machine, etc. Its advantages are mainly reflected in the small heat affected area, no pre-heating of ductile iron parts, cold welding repa...

The quality problems of shrinkage are often encountered in the production of nodular cast iron, so we learn and solve them in actual work. Many times, some problems are solved through learning, and there are also shrinking phenomena that are difficult to solve.  China cast iron parts factory  share for you: One. General laws affecting ductile iron shrinkage: 1. Modulus of  ductile iron parts . The modulus of the casting is greater than 2.5, which makes it easy to achieve riser-free casting, but some experts have set limits on this and have doubts. Generally speaking, relatively thick and large castings are easy to cast without shrinkage due to the expansion of graphitization. At this time, the carbon equivalent control should not be greater than 4.5% to avoid graphite floating. And the thin and small castings with scattered thermal joints are prone to shrinkage, which can be solved by cold iron, chromium ore or local internal riser settings. Special attention should ...