API 5CT Grade N80-1 Carbon Steel Seamless Tubings

Threading on API 5CT Grade N80-1 pipes can be identified either by stamping or stenciling the pipe adjacent to the threaded ends, which are at the manufacturer’s option. It should be with the manufacturer’s name or mark, “Spec 58” (to indicate the applicable threading specification), the specified outside diameter of the pipe, and the letters “LP” (to indicate the type of thread). The thread marking may be applied to products that do or do not bear the API monogram. For example, size 2 3/8- threaded-end pipe may be marked as follows, using the value that is appropriate for the pipe out- side diameter specified on the purchase order:

Wall Thickness : the minimum wall thickness at any point or end on API 5CT pipes and tubes shall not be greater than 12.5% under the nominal thickness specified.
Inner Diameter: For pipe ordered in inside diameter, the inside diameter shall not vary more than ñ 1% from the required/specified inside diameter.

The use of the letters ‘Spec SB’ as provided in 10.8 shall constitute a certification by the manufacturer for API 5CT Grade N80-1 Carbon Steel Seamless Tubings that the threads so marked comply with the requirements in API Standard S8 but should not be constructed by the purchaser as a representation that the product so marked is, in its entirety, in accordance with any API specification. Manufacturers who use the letters “Spec SB” for thread identification are required to have access to properly certified API master pipe gauges.

Pipes and Tubes manufactured as per API 5CT Grade N80-1 are certified with En 10204 Type 3.1/3.2. IBR,NACE,HIC,IGC,IMPACT are adhered as supplementary testing requirements.

a.) For intermediate grades, the differencec between the specified minimum tensile strength and the specified minimum yield strength for the pipe body shall be as given in the table for the next higher grade.
b.) For Intermediate grades, the specified minimum tensile strength for the weld seam shall be the same value as was determines for the pipe body using footnote
c.) The specified minimum elongation, Af, expressed in percent and rounded to the nearest percent.

For each reduction of 0.0 I% 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% for Grades API 5L X42, X46 & X52, up to a maximum of 1.65% for grades higher than X52 butt less than X70 like API 5L X56, X60 & X65 up to 2.00% for Grades X70 and higher. Following are the additional restrictions applicable for API 5L pipes and tubes.
1.) The sum of columbium Niobium and vanadium contents shall not exceed 0.03%, except that, by agreement between the purchaser and the manufacturer, an alternative maximum may be established.
2.) Columbium niobium & vanadium, or combinations thereof may be used at the discretion of the manufacturer.
3.) The sum of the columbium 1 niobium, vanadium, and titanium contents shall not exceed 0.15%.
4) The sum of the columbium, Niobium and vanadium contents shall not exceed 0.06% except that, by agreement between the purchaser and the manufacturer, an alternative maximum may be established.
5.) Further chemical compositions may be furnished by agreement between purchaser and manufacturer, providing that the limits are footnoted and the tabular Limits for phosphorus and sulfur are met.

The manufacturer shall apply a 2 in. (50 mm) daub of paint of the appropriate color on the inside surface at one end of each length of API 5CT Grade N80-1 Pipes.

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