The cooling rate affects properties less for gray iron but more for ductile iron. In other words, CG iron is less section sensitive than gray iron. However, high cooling rates are to be avoided because of the high propensity of CG iron for chilling and high nodule count in thin sections.
Ductile iron has greater strength and ductility then gray iron. Those properties allow it to be used effectively in a wide variety of industrial applications, including pipe, automotive components, wheels, gear boxes, pump housings, machine frames for the wind-power industry, and many more.
Ductile iron, also known as ductile cast iron, nodular cast iron, spheroidal graphite iron, spheroidal graphite cast iron and SG iron, is a type of graphite-rich cast iron discovered in 1943 by Keith Millis. While most varieties of cast iron are weak in tension and brittle, ductile iron has much more impact and fatigue resistance, due to its ...
Ductile iron has lower thermal conductivity, so it can insulate better than gray iron Ductile iron is more tailored for engineering applications Graphite in ductile iron is nodular, and flaked in gray iron—meaning ductile iron is stronger and contains higher ductility
Ductile iron, also referred to as nodular iron or spheroidal graphite iron, was patented in 1948. After a decade of intensive development work in the 1950s, ductile iron had a phenomenal nine-fold increase in use as an engineering material during the 1960s, and the rapid increase in commercial application continues today.
Application: Measuring the degree of nodularity in cast iron, or distinguishing nodular iron from gray iron. Background: Carbon in the form of graphite is often used as an additive in the production of cast iron, amounting to 2 to 4 percent by weight or 6 to 10 percent by volume in typical castings.
The materials examined were pearlitic nodular cast iron and flake gray cast iron, as shown in Fig. 1a and b, respectively. Table 1 shows the chemical composition of each. Characterizations of the cast irons were carried out by SEM and an image processing system (using Image Pro Plus software).
gray iron, malleable iron, chilled iron, white iron, and nodular or ductile iron. If an iron alloy exceeds about 2% car-bon, the carbon does not have to nucleate from decomposition of austenite, but instead, it can form directly from the melt by a eutectic reaction. Note that cementite (Fe 3C) can still nucleate at the eutectic more readily than graphite, but on suffi-ciently slow cooling ...
fidanza performance nodular flywheel is an inexpensive way to improve over a stock cast iron flywheel. nodular iron is denser due to graphite content being better distributed in the form of …
ductile iron is also referred to as "nodular iron." The ductile iron process was developed by The International Nickel Company, Inc. Flowserve Corporation produces valves, pumps, and other process equipment in ASTM A395 ductile iron. Ductile Iron Gray Iron A395 material showing random graphite Showing random graphite flakes. Unetched, nodules. Etched, magnification 250x. magnification 250x ...
The difference between nodular graphite cast iron and gray cast iron Compared with gray cast iron, nodular cast iron has an absolute advantage in strength. The tensile strength of nodular cast iron is 60K, while the tensile strength of gray cast iron is only 31k.
Ductile iron is an iron alloy of itself, meaning the base iron has to be properly prepared and of the proper chemical composition to make ductile iron, by either the addition of magnesium or cerium. In general the sulfur content has to be reduced to a very low level in comparison to gray iron, else the cerium will combine very readily with the sulfur and would not be available for ...
Ductile Iron ASTM A536. Ductile Iron ASTM A536 Grade 65-45-12 (Related Standards-SAE J434C D4512; ISO 1083 400-12) ASTM A536 65-45-12 is a nodular Iron with a ferritic and pearlitic microstructure and mechanical properties comparable to low alloy steels.
NODULAR IRON EN 1563 (Nodular iron) EN-GJS-400-15 Wheel hubs, hydraulic castings, differential housings, bearing housings, brake calibres, rocker arms and with financial benefit this grade often replaces welded and forged constructions.
Nodular cast iron can be identified on the basis of its structure that differentiates it from the other types of cast iron. It is used in agricultural vehicles, trucks and tractors.
Pig Iron comprises three main types: BASIC PIG IRON, used mainly in electric arc steelmaking, FOUNDRY PIG IRON used in mainly in the manufacture of grey iron castings in cupola furnaces, and NODULAR PIG IRON (SG GRADE) used in the manufacture of ductile iron castings. Pig iron is used for steel making, Foundries, Alloy making, in automotive castings and other iron based castings.
Xolox is a machining house whose main objective is the machining and assembly of aluminum, nodular iron, gray iron, steel castings or metal powder parts.
Ductile Iron is a unique engineering alloy that is similar to gray iron except that it is not brittle. The material is able to flex and has more fatigue resistance than gray iron. These properties are a result of creating graphite nodules instead of graphite flakes during solidification. Ductile iron boasts more strength and flexibility than gray iron while also featuring impact resistance ...
Metal Smelting Company grey cast iron, nodular cast iron and CNC machining. It works in the following sectors: elevation, electric motors, compressors, etc.
Nodular (ductile) cast irons – grey cast iron, in which graphite particles are modified by magnesium added to the melt before casting. Nodular cast iron consists of spheroid nodular graphite particles in ferrite or pearlite matrix.
9 · Grey Iron vs. Nodular Iron. Many people will wonder the differences between grey iron and nodular iron, this article is intended to introduce the grey iron and nodular iron in microstructure, physical properties and chemical composition.
The addition of magnesium in ductile iron means that the graphite has a nodular/spherical shape conferring higher strength and ductility as opposed to gray iron which is flake shaped. For example, 18% elongation can be easily achieved with ASTM A395 and A536 grades 60-40-18 material.
2005-06-15· Butif you perform a ring test,grey iron will not produce a ring sound,but ductile iron will. The most comprehensive test will be a microstructure analysis. RE: how to diffrentiate between grey and ductile cast iron? unclesyd (Materials) 22 May 05 22:34. There is another simple test that may work for you. Take a small sharp chisel and get on an edge and try to peel off a small chip. The gray ...
From a machinability point of view, cast irons are classified into malleable, grey, nodular, compacted graphite iron (CGI) and austempered ductile iron (ADI) types. Some of the higher hardnesses can be found in nodular cast irons and the ADI's.
Ductile iron is typically twice as strong as many grey cast irons, and nearly as strong as steel. While ductile iron shares many of the advantages of cast iron, the ductile iron is more difficult to cast, and has a different shrink rate
Ductile Iron is a type of cast iron known for its impact and fatigue resistance, elongation, and wear resistance due to the spherical (round) graphite structures in the metal. Ductile Iron is also called ductile cast iron, spheroidal graphite cast iron, or nodular cast iron. Learn more!
Gray iron belongs to a family of high-carbon silicon alloys which include malleable and nodular irons. With the exception of magnesium or other nodularizing elements in nodular iron, it is possible through variations in melting and foundry practice to produce all three materials from the same composition. In spite of the widespread use of gray iron, the metallurgy of it is not clearly ...
Fundiciones Rey, S.L. was founded in 1944. More than 50 years of continuous progress has developed into a symbiosis between traditional casting production and new industrial techniques.
Cast Iron Grades Table for Grey Iron, Malleable Iron, and Nodular Iron : Cast iron material grade comparison and equivalent grades for grey iron, malleable iron and nodular iron.