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Table 1 Chemical and mechanical requirements for API 5L X42 PSL2 steel [15]

From: Fusion-bonded epoxy composite coatings on chemically functionalized API steel surfaces for potential deep-water petroleum exploration

Chemical composition (%wt)
Carbon, maximuma 0.22b–0.24c
Manganese, maximuma 1.20
Phosphorus, maximum 0.025
Sulfur, maximum 0.015
Titanium, maximum 0.04
Otherd By agreement between the purchaser and the manufacturer, elements other those listed above may be used
Fe content, balance Typically >97 %
 Carbon equivalent (CE, Pcm), maximume 0.25
 Carbon equivalent (CE, IIW), maximumf 0.43
 Mechanical properties (MPa)
 Yield Strength, minimum 290
 Yield Strength, maximum 496
 Ultimate tensile strength, minimum 414
 Ultimate tensile strength, maximum 748
  1. aFor each reduction of 0.01 % below the specified maximum carbon content, an increase of 0.05 % above the specified maximum manganese content is permissible, up to a maximum of 1.50 %
  2. bSeamless
  3. cWelded
  4. dNiobium, vanadium, or combinations thereof may be used at the discretion of the manufacturer. The sum of the niobium, vanadium, and titanium contents shall not exceed 0.15 %
  5. eWhen the carbon content is less than or equal to 0.12 %, the carbon equivalent shall be calculated using the following formula for CE(Pcm) \(CE(Pcm) = C + \frac{Si}{30} + \frac{Mn}{30} + \frac{Cu}{30} + \frac{Ni}{30} + \frac{Cr}{30} + \frac{Mo}{30} + \frac{V}{30} + 5B\)
  6. fWhen the carbon content is greater than 0.12 %, the carbon equivalent shall be calculated using the following formula for CE(IIW) \(CE(IIW) = C + \frac{Mn}{6} + \frac{(Cr + Mo + V)}{30} + \frac{(Ni + Cu)}{15}\)
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