Technical Specification for API 5L Line Pipes

Api 5L 43rd Edition

Api 5l 44th Edition

Api 5l 45th Edition

Chemical Composition & Mechanical Properties for PSL 1

Chemical composition for PSL 1 pipe with t ≤ 25,0 mm (0.984 in)

a  0,50 % maximum for copper; 0,50 % maximum fo Nickel; 0,50 % maximum for chromium; and 0,15 % maximum formolybdenum.
For grades up to and including L360/X52, Cu, Cr and Ni shall not be added intentionally. 
b For each reduction of 0,01 % below the specified maximum concentration for carbon, an increase of 0,05 % above the specified maximum concentration for manganese is permissible, up to a maximum of 1,65 % for grades ≥ L245 or B, but ≤ L360 or X52; up to a maximum of 1,75 % for grades >L360 or X52, but <L485 or X70; and up to a maximum of 2,00 % for grade L485 or X70. 
c Unless otherwise agreed, the sum of the niobium and vanadium contents shall be ≤ 0,06 %.
d The sum of the niobium, vanadium and titanium concentrations shall be ≤ 0,15 %. 
e Unless otherwise agreed. 
f Unless otherwise agreed, the sum of the niobium, vanadium and titanium concentrations shall be ≤ 0,15 %.

API 5L PSL 1 Pipe Mechanical Properties Table

aFor intermediate grades, the difference 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. 
bFor intermediate grades, the specified minimum tensile strength for the weld seam shall be the same value as was determined for the pipe body using footnote a). 
cThe specified minimum elongation, Af expressed in percent and rounded to the nearest percent, shall be as determined using the following equation;

where

C is 1 940 for calculations using SI units and 625 000 for calculations using USC units;

Axc is the applicable tensile test piece cross-sectional area, expressed in square millimetres (square inches), as follows:

----- for circular cross-section test pieces, 130 mm2 (0.20 in2) for 12,5 mm (0.500 in) and 8,9 mm (0.350 in) diameter test pieces; and 65 mm2(0.10 in2) for 6,4 mm (0.250 in) diameter test pieces;

------ for full-section test pieces, the lesser of a) 485 mm2 (0.75 in2) and b) the cross-sectional area of the test piece, derived using the specified outside diameter and the specified wall thickness of the pipe, rounded to the nearest 10 mm2 (0.01 in2);

----- for strip test pieces, the lesser of a) 485 mm2 (0.75 in2) and b) the cross-sectional area of the test piece, derived using the specified width of the test piece and the specified wall thickness of the pipe, rounded to the nearest 10 mm2(0.01 in2);

U is the specified minimum tensile strength, expressed in megapascals (pounds per square inch).

Chemical Composition & Mechanical Properties for PSL 2

Chemical composition for PSL 2 pipe with t ≤ 25,0 mm (0.984 in)

Table ---Chemical  composition for PSL 2 pipe with t ≤ 25,0 mm (0.984 in) (Continued) 

a    Based upon product analysis. For seamless pipe with t > 20,0 mm (0.787 in), the carbon equivalent limits shall be as agreed. The CEiiw limits apply if the carbon mass fraction is greater than 0,12 % and the CEpcm 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 for carbon, an increase of 0,05 % above the specified maximum for manganese is permissible, up to a maximum of  1,65 % for grades ≥ L245 or B, but ≤ L360 or X52; up to a maximum of 1,75 % for grades >L360 or  X52, but < L485  or X70; up to a maximum of 2,00 % for grades ≥L485 or X70, but ≤ L555 or X80; and up to a maximum of 2,20 % for grades >L555 or 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 titanium 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 the 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.

Chemical compostion
9.2.4    For PSL 2 pipe with a product analysis carbon mass fraction equal to or less than 0,12 %, the carbon equivalent, CEpcm, shall be determined using Equation (2):            

where the symbols for the chemical elements represent the mass fraction in percent (see Table 5).
.If the heat analysis for boron is less than 0,000 5 % then it is not necessary for the product analysis to include boron, and the boron content may be considered to be zero for the CEpcm calculation.

9.2.5     For PSL 2 pipe with a product analysis carbon mass fraction greater than 0,12 % the carbon  equivalent, CEllw shall be determined using Equation (3):           

                                
where the symbols for the chemical elements represent the mass fraction in percent (see Table  5).

NOTE: A derogation from the ISO rules for the presentation of chemical equations has been granted for Equations (2) and (3) in deference to their longstanding use in the industry.

API 5L PSL 2 Pipe Mechanical Properties Table

a    For intermediate grades, the difference between the specified maximum yield strength and the specified minimum yield strength shall be as given in the table for the next higher grade, and the difference between the specified minimum tensile strength and the specified minimum yield strength shall be as given in the table for the next higher grade, For intermediate grades lower than Grade L555 or X80, the tensile strength shall be ≤ 760 MPa (110  200 psl). For intermediate grades higher than Grade L555 or X80, the maximum permissible tensile strength shall be obtained by interpolation. For SI units, the calculated value shall be rounded to the nearest 5 MPa. For USC units, the calculated value shall be rounded to the nearest 100 psi.
b   For grades >L625 or X90, Rp0,2 applies.
c   This limit applies for pipe with D >323, 9 mm (12.750 in).
d   For intermediate grades, the specified minimum tensile strength for the weld seam shall be the same value as was determined for the pipe body using footnote a).
e   For pipe with D<219,1 mm (8.625 in), the maximum yield strength shall be ≤495 MPa (71 800 psi).
f    The specified minimum elongation, Af,   shall be as determined using the following equation:    


Where
C        is   1 940 for calculations using SI units and 625 000 for calculations using USC units;
A xc    is the applicable tensile test piece cross-sectional area, expressed in square millimeters (square inches), as follows:
---- for circular cross-section test pieces, 130 mm2 (0.20 in2)  for 12,5 mm (0.500 in) and 8,9 mm (0.350 in) diameter test pieces;  and 65 mm2 ( 0.10 in2)   for 6,4 mm (0.250 in) diameter  test pieces;
---- for full-section test pieces, the lesser of a) 485 mm2 (0.75 in2) and b) the cross-sectional area of the test piece, derived using the specified outside diameter and the specified wall thickness of the pipe, rounded to the nearest 10 mm2 (0.01 in2)
---- for strip test pieces, the lesser of a) 485 mm2(  0.75 in2 )  and b) the cross-sectional area of the test piece, derived using the specified width of the test piece and the specified wall thickness of the  pipe, rounded to the nearest_10 mm2 (0.01 in2 );

     U  is the specified minimum tensile strength, expressed in megapascals (pounds per square inch).

Annex H (Normative) PSL 2 Pipe Ordered for Sour Service (Chemical & Mechanical Properties)

Chemical composition for sour service seamless pipe with t ≤ 25,0 mm (0.984 in)

Chemical composition for sour service welded pipe with t ≤ 25,0 mm (0.984 in)

a )   Based upon product analysis (see 9.2.4 and 9.2.5) The CEllw limits apply if the carbon mass fraction is greater than 0,12 % and the CEpcm 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 for carbon, an increase of 0,05 % above the specified maximum for manganese is permissible, up to a maximum increase of 0,20 %.
c )    AI total ≤ 0,060 %; N ≤ 0,012 %; AI/N ≥ 2:1 (not applicable to titanium-killed or titanium-treated steel); Cu ≤ 0,35 % (if agreed ,Cu ≤ 0,10 %); Ni ≤ 0,30 %; Cr ≤ 0,30 %; Mo ≤ 0,15 %; B ≤ 0,0005 %.
d )   For welded pipe where calcium is intentionally added, unless otherwise agreed, Ca/s ≥ 1,5 if S > 0,0015 % For SMLS and welded pipes, the calcium concentration shall be ≤ 0,006 %.
e )   The maximum limit for sulfur concentration may be increased to ≤ 0,008 % for SMLS pipe and, if agreed, to ≤ 0,006 % for welded pipe. For such higher-sulfur levels in welded pipe, lower Ca/s ratios may be agreed.
f )    Unless otherwise agreed, the sum of the niobium and vanadium concentrations shall be ≤ 0,06 %.
g )   The sum of the niobium, vanadium and titanium concentrations shall be ≤ 0,15 %.
h )   For SMLS pipe, the listed value may be increased by 0,03.
i )    If agreed, the molybdenum concentration shall be ≤ 0,35 %.
j )    If agreed, the the chromium concentration shall be ≤ 0,45 %.
k )   If agreed, Cr concentration shall be ≤ 0,45 % and Ni concentration shall be ≤ 0,50 %. 

Sour Service Welded Pipe Mechanical Properties Table

a     For intermediate grades, the difference between the specified maximum yield strength and the specified minimum yield strength shall be as given in the table for the next higher grade, and the difference between the specified minimum tensile strength and the specified minimum yield strength shall be as given in the table for the next higher grade, For intermediate grades, the tensile strength shall be ≤ 760 MPa (110  200 psi).
b    This limit applies for pipe with D >323, 9 mm (12.750 in).
c     For intermediate grades, the specified minimum tensile strength for the weld seam shall be the same value as was determined for the pipe body using footnote a).
d     For pipe with D<219,1 mm (8.625 in), the maximum yield strength shall be ≤495 MPa (71 800 psi).
e    The specified minimum elongation, Af, on 50mm or 2 in, expressed in percent and rounded to the nearest percent, shall be as determined using the following equation:    

Where
C        is   1 940 for calculations using SI units and 625 000 for calculations using USC units;
A xc    is the applicable tensile test piece cross-sectional area, expressed in square millimeters (square inches), as follows:
---- for circular cross-section test pieces, 130 mm2 (0.20 in2)  for 12,5 mm (0.500 in) and 8,9 mm (0.350 in) diameter test pieces;  and 65                        mm2 ( 0.10 in2)   for 6,4 mm (0.250 in) diameter  test pieces;
---- for full-section test pieces, the lesser of a) 485 mm2 (0.75 in2) and b) the cross-sectional area of the test piece, derived using the                        specified outside diameter and the specified wall thickness of the pipe, rounded to the nearest 10 mm2 (0.01 in2)
---- for strip test pieces, the lesser of a) 485 mm2(  0.75 in2 )  and b)  the cross-sectional area of the test piece, derived using the                         specified width of the test piece and the specified wall thickness of the  pipe, rounded to the nearest_10 mm2 (0.01 in2 );

          U     is the specified minimum tensile strength, expressed in megapascals (pounds per square inch).

Annex J (normative) PSL 2 Pipes ordered for Offshore Service

Chemical composition for offsoure service seamless pipe with t ≤ 25,0 mm (0.984 in)

Welded Pipes

Based upon product analysis (see 9.2.4 and 9.2.5) The CE llw limits apply if the C > 0,12 % and the CE pcm limits apply if the < 0,12 %.
b    For each reduction of 0,01 %  below the specified maximum for C, an increase of 0,05 % above the specified maximum for Mn is permissible, up to a maximum increase of 0,20 %, but up to a maximum of 2.20% for grades ≥ L625 or X90.
c    Al total ≤ 0,060 %; N ≤ 0,012 %; Al/N ≥ 2:1 (not applicable to titanium-killed or titanium-treated steel);
d   Unless otherwise agreed , Nb + V ≤ 0,06 %.
e   Nb + V + Ti ≤ 0,15 %.
f    Cu ≤ 0,35 %; Ni ≤ 0,30 %; Cr ≤ 0,30 %; Mo ≤ 0,10 %; B ≤ 0,000 5 %.
g   For SMLS pipe, the listed value is increased by 0,03 percentage points, up to a maximum of 0,25 %.
h   Cu ≤ 0,50 %; Ni ≤ 0,50 %; Cr ≤ 0,50 %; Mo ≤ 0,50 %; B ≤ 0,000 5 %.
i   Cu ≤ 0,50 %; Ni ≤ 0,60 %; Cr ≤ 0,55 %; Mo ≤ 0,80 %; B ≤ 0,000 5 %.

J.4.2 Tensile properties
J.4.2.1 The tensile properties shall be as given in Table J.2.
J.4.2.2 If additional tensile properties are required to be determined at other than room temperature, the acceptance criteria shall be as agreed.
Table J.2 ---Requirements  for  the  results  of  tensile  tests

Table J.2 --Requirements  for  the  results  of  tensile  tests
a     For intermediate grades, the difference between the specified maximum yield strength and the specified minimum yield strength shall be as given in the table for the next higher grade, and the difference between the specified minimum tensile strength and the specified minimum yield strength shall be as given in the table for the next higher grade, For intermediate grades up to Grade L320 or X46, the tensile strength shall be ≤ 655 MPa (95 000). For intermediate grades greater than Grade L320 or X46 and less than Grade L550 or X80, the tensile strength shall be ≤ 760 MPa (110 200). For intermediate grades higher than Grade L555 or X80, the maximum permissible tensile strength shall be obtained by interpolation. For SI Units, the calculated value shall be rounded to the nearest 5 MPa. FOr USC units, the calculated value shall be rounded to nearest 100 psi.
b    If agreed for pipe in grades equal to or greater than Grade L555 or X80, more stringent maximum tensile strength limits may apply. 
c    This limit applies for pipe with D >323, 9 mm (12.750 in).
d     For intermediate grades, the specified minimum tensile strength for the weld seam shall be the same value as was determined for the pipe body using footnote a).
e     For pipe requiring longitudinal testing the yield strength shall be ≤495 MPa (71 800 psi).
f    The specified minimum elongation, Af, on 50mm or (2 in), expressed in percent and rounded to the nearest percent, shall be as determined using the following equation:    

Where
C      is   1 940 for calculations using SI units and 625 000 for calculations using USC units;
A xc   is the applicable tensile test piece cross-sectional area, expressed in square millimeters (square inches), as follows:
-- for circular cross-section test pieces, 130 mm2 (0.20 in2)  for 12,5 mm (0.500 in) and 8,9 mm (0.350 in) diameter test pieces;  and 65 mm2 ( 0.10 in2)   for 6,4 mm (0.250 in) diameter  test pieces;
-- for full-section test pieces, the lesser of a) 485 mm2 (0.75 in2) and b) the cross-sectional area of the test piece, derived using the specified outside diameter & the specified wall thickness of the pipe, rounded to the nearest 10 mm2 (0.01 in2)
-- for strip test pieces, the lesser of a) 485 mm2(  0.75 in2 )  and b)  the cross-sectional area of the test piece, derived using the specified width of the test piece and the specified wall thickness of the  pipe, rounded to the nearest 10 mm2 (0.01 in2 );
U     is the specified minimum tensile strength, expressed in megapascals (pounds per square inch).
g     For grades > L625QO or X90QO, Rp0.2 applies.
h     Lower Rt0.5 /Rm ratio values may be specified by agrement for L625 or X90.
i     For Grades >L625 or X90, Rp0.2 /Rm applies. Lower Rp0.2 /Rm ratio values may be specified by agrement.