In sections 6.1.1 and 6.1.2 of API 5 L guidelines it specifies that purchasers and buyers must know the chemical composition of OCTG for welding. At a minimum the operator must know the following elements:

  • Carbon
  • Manganese
  • Phosphorus
  • Sulfur
  • Chromium
  • Columbium (Niobium)
  • Copper
  • Molybdenum
  • Nickel
  • Silicon
  • Titanium
  • Vanadium

b. Boron. (But if the heat analysis indicates a boron content
less than 0.00 I %, then no boron determination is required for
the product analysis.)
c. Any other alloying element added during steelmaking for
a purpose other than deoxidation.

6.1.3.1 Calculation of Carbon Equivalent
For PSL 2 pipe, carbon equivalent (CE) calculations shall
be based on the product analyses and shall be calculated as
follows. All carbon equivalent results shall be reported:
a. When the carbon content is less than or equal to 0.12%,
the carbon equivalent shall be calculated using the following
formula for CE(Pcm) [see Note I]:
CE(Pcm) = C+ Si/30 + Mn/20  + Cu/20 + Ni/60 +Cr/20 + Mo/15 + V/10 + 5B

If the heat analysis indicates a boron content less than
0.00 I %, then the product analysis need not include boron,
and the boron content can be considered as zero for the
CE(Pcm) calculation.
b. When the carbon content is greater than 0.12%, the carbon
equivalent shall be calculated using the following formula for
CE(lIW) [see Note 2]:
CE(lIW)  = C + Mn/6 + (Cr+Mo+V /5) + (Ni+Cu)15

The PMI-MASTER Smart can analyze all of the elements required by API 5L, product analysis reports and store/compute CE calculations. Contact Verichek Technical Services, Inc. today and better educate yourself on how the PMI-MASTER Smart can help your business meet API 5L guidelines.

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