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How are malleable cast irons designated for different grades?

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How are malleable cast irons designated for different grades?

(a) By tensile strength

(b) By six or seven-digit numbers

(c) By five-digit numbers

(d) By alphabets

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This interesting question is from Cast Irons topic in division Non Ferrous Materials of Engineering Material & Metallurgy

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The correct option is (c) By five-digit numbers

Explanation: ASTM has designated the grading system for malleable cast irons in five-digit numbers. A grade 32510 has a yield strength of 32500 psi. Six or seven-digit numbers are used to designate spheroidal graphite cast irons (60-40-18 with ferritic structure). Grey cast irons are designated by their tensile strength (grade 20 denotes a tensile strength of 20000 psi).

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