Advantages and disadvantages of ductile iron valve body
/07/29 09:07:29
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As an alternative to steel, humans developed ductile iron in . Cast steel contains less than 0.3% carbon, while cast iron and ductile iron contains at least 3% carbon. The low carbon content in cast steel so that carbon present as free graphite does not form structural sheets. The natural form of carbon in cast iron is a free graphite sheet form. Within ductile iron, these graphite flakes change into tiny spheres by special treatments. This improved sphere gives ductile iron a much better physical performance than cast iron and steel. It is this spherical microstructure of carbon that provides better ductility and impact resistance for ductile iron. But the thin form inside causes the cast iron no ductility .
Therefore, all the pressure load components of the ductile iron are treated by the ferric bulk annealing cycle, and the spherical structure inside the ductile iron can also eliminate the easy cracks of the thin graphite inside the cast iron. In microscopic photographs of ductile iron, the cracks can be seen terminating after marching to the graphite ball. In the ductile iron industry, these graphite spheres are called "crack finishers" because of their ability to stop breaking.
Compared with cast iron ,ductile iron has an absolute advantage in strength.The tensile strength of ductile iron is 60k, and the cast iron is only 31k.The yield strength of the ductile iron is 40k, and the cast iron did not show the yield strength and eventually broke.
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The strength of the ductile iron is comparable to the strength of the cast steel. Dutile iron has higher yield strength at a minimum of 40k, and cast steel is only 36k.In most municipal applications, such as water, salt water, steam, etc. , ductile iron corrosion resistance and oxidation resistance exceed cast steel. Due to the spherical graphite microstructure of the ductile iron, the ductile iron is better than the cast steel in terms of weakening the vibration ability, so it is more conducive to reducing the stress. An important reason for choosing ductile iron is that ductile iron is less expensive than cast steel. The low cost of ductile iron made this material more popular, with higher casting efficiency, and less machining cost of ductile iron.
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Ductile iron is a much more recent iron alloy formed from endophyte graphite. This provides the fabric with high ductility, which means it will not crack when bending. The thermal limit is somewhat lower than that of cast iron, although it remains relatively high at F. (730C). Ductile iron valves employ pressure ratings 150 and 300 as well. Class 150 ductile iron maintains a seal up to 250 psi at ordinary surrounding temperature. Class 300 can withstand pressures of up to 640 psi.
Ductile iron has high strength and stiffness, structural rigidity, and ultimate tensile. Because ductile iron does not shatter when folded, it is more useful for applications operations than cast iron. Ductile iron is a durable and long-lasting material for pipelines, joints, and valves.
The design team will also be interested to note that Poisson&#;s Proportion for ductile iron is typically regarded to be 0.275. The ratio limit is equally relevant to design professionals. The proportionate limit to 0.2 percent ultimate tensile ratio for ferritic levels (60-40-18) is generally 0.71. The same ratio is commonly 0.56 for austenitic levels (80-55-06).
Ductile iron has outstanding structural integrity and can withstand high heat without damage. This is due to the ductile quality of the raw materials, which makes them considerably less prone to be bent and twisted. Rust will also be attracted to ductile iron over the duration.
Ductile iron is employed in more specialized industrial applications to its improved fracture toughness:
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