In contrast to the traditional view of these elemental effects noted herein, work in the 1980’s confirms that in many cases manganese levels beyond that amount combined with sulfur (about 1.7 times the sulfur level) tend to reduce strength and hardness via promotion of more ferrite. This is the matter of manganese and sulfur effects. While this brief technical paper, originally presented in 1969, is still one of the best summaries of gray iron metallurgy and properties, we call your attention to one item on which recent research and foundry experience has shed more light. To: All readers of report on Gray Iron by D.E Krause KEY WORDS: gray iron castings, casting design, foundry methods, ductile iron castings, malleable iron castings, metals, tests, evaluation Although the relationship between Brinell hardness and tensile strength for gray iron is not constant, data are shown which will allow use of the Brinell hardness test to estimate the minimum tensile strength of the iron in a casting. An unnecessary increase in strength and hardness may increase the cost of the casting as well as increase the cost of machining through lower machining rates. By subsequent heat treatment, the hardness can be increased to H g should be carefully reviewed before specifying a higher strength and hardness grade of iron. By suitable adjustment in composition and selection of casting method, tensile strength can be varied from less than 20,000 psi to over 60,000 psi and hardness from 100 to 300 BHN in the as-cast condition. The low degree or absence of shrinkage and high fluidity provide maximum freedom of design for the engineer. The high carbon content is responsible for ease of melting and casting in the foundry and for ease of machining in subsequent manufacturing. 3-28.ĪBSTRACT: Gray iron is the most versatile of all foundry metals. E., “Gray Iron-A Unique Engineering Material” Gray, Ductile, and Malleable Iron Castings-Current Capabilities, ASTM STP 455, American Society for Testing and Materials, Philadelphia, 1969, pp. For more information, contact our sales staff at 88.D.E. In addition to being a quality cast iron manufacturer, we offer in-house metallurgical testing, as well as heat-treat capabilities and specialty products, such as Pile Drive Hammers, Follow Blocks and Breaker Balls. We also have the capability to produce oil sand, shell sand, isocure, and no-bake cores. We produce various mold sizes with green sand molding processes utilizing Hunters, Squeezer, and Rota-Lift systems, as well as the Flaskless, no-bake molding system. We can pour custom metal castings from a few ounces up to 3,000 pounds. Our experienced and knowledgeable staff combined with our modern production methods, including new furnaces installed in 2009, allows us to provide our customers with the highest level of service and support. Our customers come from diverse industries, including: industrial, engineering, decorative, architectural, and government however, they share the need for high quality castings, competitive pricing and quick order turn-around. Located in Nebraska, we supply customers in the Midwest, across the country and around the world with best-in-class products, services and delivery. One of the oldest and most experienced Cast Iron Manufacturers in the United States Sioux City Foundry is a modern cast, ductile, austempered ductile and ni-hard iron manufacturer. In-house metallurgical testing and heat-treating capabilities.Wide range of ASTM standard cast iron grades, including: gray, ductile, austempered ductile and ni-hard iron castings.Castings from a few ounces to a few tons, in small and large quantities.Let us put our knowledge and experience to work for you. As a 145-year-old cast iron manufacturer, we've learned what it takes to provide our customers with the highest quality cast iron products, as well as best-in-class service.
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