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10423:2009 / API 6A 20 th ed.

10423:2009 / API 6A 20 th ed. Table 9 – Steel composition limits. API 6A 15 th -19 th editions included a maximum composition limit on Nickel:. API 6A 20 th edition deleted limit on Nickel. Reasons for change :

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10423:2009 / API 6A 20 th ed.

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  1. 10423:2009 / API 6A 20th ed. Table 9 – Steel composition limits

  2. API 6A 15th -19th editions included a maximum composition limit on Nickel:

  3. API 6A 20th edition deleted limit on Nickel. • Reasons for change: • Nickel limit is not required for non-NACE equipment (Matls Class AA, BB, CC). • Deleting limit on Ni allows use of additional material grades such as 4340 for AA-CC. • Deleting limit on Ni allows use of full ASTM chemistry range of currently-used materials such as F6NM.

  4. API 6A 20th edition deleted limit on Nickel. • Concerns about this change: • Users of undocumented equipment cannot base acceptance for sour service on hardness alone. • Practice of using hardness testing as basis of conformance to NACE MR0175 is prevalent. • Limits interchangeability of equipment. • Limits flexibility of repaired and remanufactured equipment. (Not addressed in Annex J)

  5. API 6A 20th edition deleted limit on Nickel. • Questions about this change: • Is the benefit of using 4340 or unrestricted F6NM significant relative to the increased risk? • Are there other alloys/material grades that would also be used as a result of this change? • Should the change be addressed in Annex J? • Does this affect other product specifications that reference 6A/10423?

  6. Proposed new work item: • Convene a new task group or ask Materials Task Group to consider the effects of this change from 6A 15th – 19th editions, and make a recommendation to keep or reverse it.

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