API 571-Temper Embrittlement Affected Materials

Temper Embrittlement primarily affects what materials?

What materials manufactured prior to 1972 may be particularly susceptible to Temper Embrittlement?

What materials are also susceptible to Temper Embrittlement?

What materials are not significantly affected by temper embrittlement, but can have their toughness or high-temperature ductility altered by metallurgical changes promoted by high-temperature damage mechanisms?

What materials are generally more affected than today’s low-impurity base materials?