Tensile variation outstanding, not just acceptable.In regard to the question posed in "Casting Answers & Advice," August 2006 ("What is the normal variation for tensile strength tensile strength Ratio of the maximum load a material can support without fracture when being stretched to the original area of a cross section of the material. When stresses less than the tensile strength are removed, a material completely or partially returns to its results, and how do you reduce the variation? For gray iron G3000, we have tensile tensile, adj having a degree of elasticity; having the ability to be extended or stretched. results of 31 ksi to 34 ksi. Is this acceptable?"), assuming the metalcasting facility asking the question was citing results from a number of tests, their control is outstanding, not merely acceptable. In the article titled "Benchmarking Iron Control," which appeared as a web only article in July 2002, the Cast Iron Div.'s Quality Control Committee said that of the 40 metalcasting facilities responding to a survey, the lowest standard deviation In statistics, the average amount a number varies from the average number in a series of numbers. (statistics) standard deviation - (SD) A measure of the range of values in a set of numbers. was 1,120 psi for the tensile strength of class 30 iron. In another article from the commit tee appearing in the 1992 transactions, "Reproducibility of Mechanical Property Measurements in Ductile Iron Ductile iron, also called ductile cast iron or nodular cast iron, is a type of cast iron invented in 1943 by Keith Millis[1]. While most varieties of cast iron are brittle, ductile iron is much more ductile, as the name implies. ," the average standard deviation for labs testing the same iron was 1.0 ksi when all of the machining was done by the same high quality operation. The article on benchmarking gray iron control also pointed out one of the strongest correlations to tensile variation was the control of the variation of sulfur content of the iron. The control of tensile properties in the irons has long been an interest to the Cast Iron Division's Quality Control Committee. Persons seeking more information would benefit from talking to Noun 1. talking to - a lengthy rebuke; "a good lecture was my father's idea of discipline"; "the teacher gave him a talking to" lecture, speech rebuke, reprehension, reprimand, reproof, reproval - an act or expression of criticism and censure; "he had to the members of the committee. ROY LOBENHOFER, LOBENHOFER CONSULTING INC inc - /ink/ increment, i.e. increase by one. Especially used by assembly programmers, as many assembly languages have an "inc" mnemonic. Antonym: dec. . MOUNT PROSPECT, ILL. |
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