API spec 5L Specification for Line Pipe
Transportation of petroleum and natural gas;
Sour service; Offshore service
3. Chemical Requirements
|Chemical Composition for PSL 2 pipe with t ≤ 0.984”|
|Steel Grade||Mass fraction, % based on heat and product analyses||Carbon Equiv a%|
|C b||Si||Mn b||P||S||V||Nb||Ti||Other||CE IIW||CE Pcm|
|a Based upon product analysis, for seamless pipe with t＞20.0mm (0.787in), the carbon equivalent limits shall be as agreed. The CE IIW limits apply if the carbon mass fraction is greater than 0.12% and the CE Pcm limits apply if the carbon mass fraction is less than or equal to 0.12%.|
|b. For each reduction of 0.01% below the specified maximum concentration for carbon, an increase of 0.05% above the specified maximum for manganese is permissible, up to a maximum of 1.65% for grades ≥B, but ≤X52; up to a maximum of 1.75% for grades＞X52, but ＜X70; and up to a maxiumum of 2.00% for grade ≥X70, but ≤X80; and up to a maxium of 2.20% for grades ＞X80.|
|c. Unless otherwise agreed, the sum of the niobium and vanadium concentrations shall be ≤0.06%|
|d. The sum of the niobium, vanadium and titianium concentrations shall be ≤0.15%|
|e. unless otherwise agreed, 0.50% maximum for copper, 0.30% maximum for nickel, 0.30% maximum for chromium and 0.15% maximum for molybdenum.|
|f. Unless otherwise agreed.|
|g. unless otherwise agreed, the sum of niobium, vanadium and titanium concentrations shall be ≤0.15%.|
|h. Unless otherwise agreed, 0.50% maximum for copper, 0.50% maximum for nickel, 0.50% maximum for chromium and 0.50% maximum for molybdenum.|
|i. Unless otherwise agreed, 0.50% maximum for copper, 1.00% maximum for nickel, 0.50% maximum for chromium and 0.50% maximum for molybdenum.|
|j 0.004% maximum for boron.|
4. CVN impact Test for PSL2 Pipe
If subsize test pieces are used, the required minimum average (set of three test pieces) absorbed energy values shall be the required values for full-size test pieces times the ratio of the specified width of the subsize test piece to the specified width of the full-size test piece, wit such derived values rounded to the nearest joule (foot-pound force).
Individual test values for any test piece shall be≥ 75% of the required minimum averge (of a set of three test pieces) absorbed energy values.
Tests conducted at temperatures lower than the specified test temperature shall be acceptable if the applicalble requirements for energy abosorption and shear fracture area are met at such lower temperatures.
5. Surface conditions, imperfections and defects
All pipes shall be free from defects in the finished condition.
All pipes shall be free from cracks, sweats and leaks.
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