JB/T 6720-1993Intake and exhaust valves for internal combustion engines - Metallographic examination (English PDF)

JB/T 6720-1993 is the English-translated version of 内燃机进、排气门 金相检验.

The metallographic examination of intake and exhaust valves for internal combustion engines is the subject of JB/T 6720-1993, a recommended standard of the Chinese mechanical and machinery industry. It carries the Chinese classification J93. Among the standards it quotes are GB/T 5617, GB 6394, GB/T 9451, GB/T 11354 and JB/T 6012. It supersedes NJ 354-1985.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

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