SAE J431 PDF

Structure[ edit ] A typical chemical composition to obtain a graphitic microstructure is 2. Another factor affecting graphitization is the solidification rate; the slower the rate, the greater the time for the carbon to diffuse and accumulate into graphite. A moderate cooling rate forms a more pearlitic matrix, while a fast cooling rate forms a more ferritic matrix. To achieve a fully ferritic matrix the alloy must be annealed. In two dimensions, as a polished surface, the graphite flakes appear as fine lines. The graphite has no appreciable strength, so they can be treated as voids.

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Structure[ edit ] A typical chemical composition to obtain a graphitic microstructure is 2. Another factor affecting graphitization is the solidification rate; the slower the rate, the greater the time for the carbon to diffuse and accumulate into graphite. A moderate cooling rate forms a more pearlitic matrix, while a fast cooling rate forms a more ferritic matrix.

To achieve a fully ferritic matrix the alloy must be annealed. In two dimensions, as a polished surface, the graphite flakes appear as fine lines. The graphite has no appreciable strength, so they can be treated as voids. The tips of the flakes act as preexisting notches at which stresses concentrate and it therefore behaves in a brittle manner. Grey iron also has very good damping capacity and hence it is often used as the base for machine tool mountings. Class 20 has a high carbon equivalent and a ferrite matrix.

Higher strength gray irons, up to class 40, have lower carbon equivalents and a pearlite matrix. Gray iron above class 40 requires alloying to provide solid solution strengthening , and heat treating is used to modify the matrix. Class 80 is the highest class available, but it is extremely brittle.

These grades are a measure of the tensile strength-to- Brinell hardness ratio.

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Comparison Table for Some Gray Iron Casting Grades

Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. Sae j detail specification information as per follows: Other combinations of iron grade sae j hardness grade which are established in production and use or become so in the course of application development, sae j in accordance with 3. China tent material China uniform material China pillow filling material. Other special materil matel main titanium alloy parts. Typical base composition ranges generally employed for the iron grades are shown in Table A1. We appreciate your input.

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SAE J431 PDF DOWNLOAD

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Table of Steel Equivalent Grades (EN, SAE/AISI, UNS, DIN, BS, UNI, JIS)

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