Ductile iron

Dual cure sites Ductile iron Ductile particles Duct silencers Dugro [7681-76-7]... 

HBI has been successfully melted in cupolas (hot or cold blast), induction furnaces (coreless or channel), and electric arc furnaces. It can be a valuable charge material for ductile and malleable irons as well as steel. It is of particular value in making ductile iron castings because of its very low residual element content. 

Proceedings of 1 st International Conference on Austempered Ductile Iron, American Society for Metals, 1984. 

As an approximation, 50% of the Hst price should be added to account for auxiUaries such as motor, seal, baseplate, and coupling. Furthermore, the material upgrade from ductile iron constmction to stainless steel roughly doubles the price. Pump manufacturers use price bookmultiphers, eg, discounts, to arrive at a selling price. These vary, but as an estimate, a 30% discount is reasonable. U.S. pump manufacturers include the following. 

Barium- and calcium-bearing manganese siUcon is used as an inoculant in gray and ductile iron. The alloy contains 60—65% Si, 9—11% Mn, 4—6% Ba, 1—3% Ca, and 1—1.5% Al. The combination of barium, calcium, and manganese provides excellent chill reduction, improves the graphite stmcture, and minimizes section sensitivity in castings having thin and thick sections. 

Zirconium-hearing 75% ferroshicon is used as an iaoculant ia both gray and ductile iron. The ahoy contains 70—80% Si, 0.4—1.5% Ca, 1—1.8% Al, and 0.25—3.5% Zr. Because of its high dissolution rate, it can be added ia the ladle or ia-stream iaoculant. This ahoy gives excehent chill reduction. 

A second, more recently developed use for strontium metal is as an inoculant in ductile iron castings. Inoculants provide nuclei upon which graphite forms during the sohdification of cast iron, thus preventing the formation of white cast iron. Elkem Metals Company has commercialized a range of fine-sized foundry inoculants for iron castings. These inoculants, called superseed, are ferrosiUcon alloys containing 50 or 75% Si, 0.8% Sr. Most of the balance is iron. 

Antimony may be added to copper-base alloys such as naval brass. Admiralty Metal, and leaded Muntz metal in amounts of 0.02—0.10% to prevent dezincification. Additions of antimony to ductile iron in an amount of 50 ppm, preferably with some cerium, can make the graphite fliUy nodular to the center of thick castings and when added to gray cast iron in the amount of 0.05%, antimony acts as a powerflil carbide stabilizer with an improvement in both the wear resistance and thermal cycling properties (26) (see Carbides). 

In the United States calcium carbide-based acetylene is mainly used in the oxyacetylene welding market although some continues to be used for production of such chemicals as vinyl ethers and acetylenic alcohols. Calcium carbide is used extensively as a desulfurizing reagent in steel and ductile iron production allowing steel mills to use high sulfur coke without the penalty of excessive sulfur in the resultant steel (see Sulfurremoval and recovery). Calcium cyanamide production continues in Canada and Europe (see Cyanamides). 

Cast Iron, Ductile Iron, and High-Silicon Iron. 10-92... 

Other Types of Piping Joints Packed-gland joints (Fig. 10-135) require no special end preparation of pipe but do reqmre careful control of the diameter of the pipe. Thus the suppher of the pipe shoiild be notified when packed-gland joints are to be used. Cast- and ductile-iron pipe, fittings, and valves are available with the bell cast on one or... 

Ferrous valves are also available in nodular (ductile) iron, which has tensile strength and yield point approximately equal to cast carbon steel at temperatures of 343°C (6.50°F) and below and only slightly less elongation. 

CAST IRON, DUCTILE IRON, AND HIGH-SILICON IRON... 

Cast Iron and Ductile Iron Cast iron and ductile iron provide more metal for less cost than steel in piping systems and are widely... 

Extracted from the American National Standard for Ductile-Iron Pipe, CentrifugaUy Cast in Metal Molds or Sand-Lined Molds, for Water or Other liquids, ANSI A21.51—1976, with permission of the piihlisher, the American Society of Mechanical Engineers, New York. 

Crete piping systems can be lined with special salt-glazed vitrified-clay liner plates, joined with a die-cast aspnalt joint. Concrete pressure pipe is competitive with cement-lined ductile iron for underground plant water systems. 

Temperature, op Carbon steel, carbon-molybdenum low-chromium (through 3 Cr Mo) 5Cr Mo through 9 Cr Mo Austenitic stainless steels, 18 Cr, 8 Ni 12 Cr 17 Cr 27 Cr 25 Cr, 20 Ni Monel 67 Ni, 30Cii 3V2 Nickel Aluminum Gray cast iron Bronze Brass 70Cii, 30 Ni Ni-Fe-Cr Ni-Cr-Fe Ductile iron... 

Listed metallic materials Ductile iron, malleable iron. Carbon steel, ASTM A36, ASTM A283 1. No additional requirements. 1. Shall not be used. 

Austenitic ductile iron, ASTM A571 4(3. No ad(htional requirements. 4b. Wel(hng not permitted. 4. The material shall be impact-tested. This material shall not be used at design minimum temperatures lower than —196 C (—320 F). Wel(hug is not permitted. 

Forging, part UF. Welded const. UW. j Cast Ductile Iron UCD. 

Part UHT also contains more stringent details for nozzle welding that are required for some of these hi -strength materials. Part UCI has rules for cast-iron construction. Part UCL has rules for welded vessels of clad plate as lined vessels, and Part UCD has rules for ductile-iron pressure vessels. 

There are a number of grades of ductile iron some have maximum toughness and machinability others have maximum resistance to oxidation. 

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