Valve Material Tips: Ductile Iron Vs Cast Steel

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.

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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.

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Ductile iron is employed in more specialized industrial applications to its improved fracture toughness:

C151/A21.51-17 Ductile Iron Pipe, Centrifugally Cast

Centrifugal casting, also known as the deLavaud process, has been the preferred iron pipe casting method since its invention in . First issued in and revised nine times over subsequent decades, AWWA C151 covers the minimum manufacturing requirements for Ductile iron pipe used in potable water, raw water, wastewater, and reclaimed water applications.

Like all the standards in this blog, C151 is organized into sections such as:

• I.B &#; History
• 1.2 &#; Purpose
• 3 &#; Definitions

This makes citing the document easy. It continues with "Requirements," in section 4 of C151, which lays out the specifics for manufacturing DI pipe.

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• 4.1 &#; The materials to be used in casting
• 4.2 &#; The pipe&#;s ability to withstand harsh or polluted environments
• 4.3 &#; Standard dimensions and lay lengths
• 4.4 &#; Coatings and linings to extend the performance life of the pipe
• 4.5 &#; Acceptable variations for pipe dimensions and thickness
• 4.6 &#; The requirements for testing pipe thickness
• 4.7 &#; Manufacturer information must be cast or stamped onto the pipe