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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Table 9 – Steel composition limits
API 6A 15th -19th editions included a maximum composition limit on Nickel: