API Specification 20E
Austenitizing temperatures shall not exceed 1700F (925C). Tempering temperatures for ASTM A193, Grade B7, ASTM A320, Grade L7, and Grade L43, and ASTM A540 Grade B23 shall not exceed 1300ºF (700ºC). Induction and direct-resistance heat treating processes can exceed these temperatures, causing potential metallurgical problems.
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