ASTM E45-10e1 pdf free download.Standard Test Methods for Determining the Inclusion Content of Steel.
ASTM E45-10e1 cover a number of recognized procedures for determining the nonmetallic inclusion content of wrought steel. Macroscopic methods include macroetch, fracture, step-down, and magnetic particle tests. Microscopic methods include five generally accepted systems of examination. In these microscopic methods, inclusions are assigned to a category based on similarities in morphology, and not necessarily on their chemical identity. Metallographic techniques that allow simple differentiation between morphologically similar inclusions are briefly discussed. While the methods are primarily intended for rating inclusions, constituents such as carbides, nitrides, carbonitrides, borides, and intermetallic phases may be rated using some of the microscopic methods. In some cases, alloys other than steels may be rated using one or more of these methods; the methods will be described in terms of their use on steels.
These test methods deal only with recommended test methods and nothing in them should be construed as defining or establishing limits of acceptability for any grade of steel.
7. Sampling
7.1 To obtain a reasonable estimate of inclusion variations within a lot, at least six locations, chosen to be as representa tive of the lot as possible, should be examined. In this context. a lot shall be defined as a unit of material processed at one time and subjected to similar processing variables.
7.2 For cases in which a definite location within a heat. ingot, or other unit lot is unknown, statistical random sampling with a greater number of specimens should be employed.
7.3 Ratings obtained will vary with the amount of reduction of the product. For materials acceptance or for comparison among heats, care must be taken to sample at the correct stage of processing.
ASTM E45-10e1 pdf download
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