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Chemical composition for PSL 2 pipe with t ≤ 25,0 mm (0.984 in)
Table 5 |
| Steel grade (steel name) |
Mass fraction, based upon heat and product analyses
% maximum |
Carbon equivalenta
% maximum |
| C b |
Si |
Mn b |
P |
S |
V |
Nb |
Ti |
Other |
CEiiw |
CEpcm |
| Seamless and welded pipes |
| L245R or BR |
0,24 |
0,40 |
1,20 |
0,025 |
0,015 |
c |
c |
0,04 |
e |
0,43 |
0,25 |
| L290R or X42R |
0,24 |
0,40 |
1,20 |
0,025 |
0,015 |
0,06 |
0,05 |
0,04 |
e |
0,43 |
0,25 |
| L245N or BN |
0,24 |
0,40 |
1,20 |
0,025 |
0,015 |
c |
c |
0,04 |
e |
0,43 |
0,25 |
| L290N or X42N |
0,24 |
0,40 |
1,20 |
0,025 |
0,015 |
0,06 |
0,05 |
0,04 |
e |
0,43 |
0,25 |
| L320N or X46N |
0,24 |
0,40 |
1,40 |
0,025 |
0,015 |
0,07 |
0,05 |
0,04 |
d,e |
0,43 |
0,25 |
| L360N or X52N |
0,24 |
0,45 |
1,40 |
0,025 |
0,015 |
0,10 |
0,05 |
0,04 |
d,e |
0,43 |
0,25 |
| L390N or X56N |
0,24 |
0,45 |
1,40 |
0,025 |
0,015 |
0,10f |
0,05 |
0,04 |
d,e |
0,43 |
0,25 |
| L415N or X60N |
0,24f |
0,45f |
1,40f |
0,025 |
0,015 |
0,10f |
0,05 |
0,04f |
g,h |
as agreed |
| L245Q or BQ |
0,18 |
0,45 |
1,40 |
0,025 |
0,015 |
0,05 |
0,05 |
0,04 |
e |
0,43 |
0,25 |
| L290Q or X42Q |
0,18 |
0,45 |
1,40 |
0,025 |
0,015 |
0,05 |
0,05 |
0,04 |
e |
0,43 |
0,25 |
| L320Q or X46Q |
0,18 |
0,45 |
1,40 |
0,025 |
0,015 |
0,05 |
0,05 |
0,04 |
e |
0,43 |
0,25 |
| L360Q or X52Q |
0,18 |
0,45 |
1,50 |
0,025 |
0,015 |
0,05 |
0,05 |
0,04 |
e |
0,43 |
0,25 |
| L390Q or X56Q |
0,18 |
0,45 |
1,50 |
0,025 |
0,015 |
0,07 |
0,05 |
0,04 |
d,e |
0,43 |
0,25 |
| L415Q or X60Q |
0,18f |
0,45f |
1,70f |
0,025 |
0,015 |
g |
g |
g |
h |
0,43 |
0,25 |
| L450Q or X65Q |
0,18f |
0,45f |
1,70f |
0,025 |
0,015 |
g |
g |
g |
h |
0,43 |
0,25 |
| L485Q or X70Q |
0,18f |
0,45f |
1,80f |
0,025 |
0,015 |
g |
g |
g |
h |
0,43 |
0,25 |
| L555Q or X80Q |
0,18f |
0,45f |
1,90f |
0,025 |
0,015 |
g |
g |
g |
i,j |
as agreed |
| Welded pipe |
| L245M or BM |
0,22 |
0,45 |
1,20 |
0,025 |
0,015 |
0,05 |
0,05 |
0,04 |
e |
0,43 |
0,25 |
| L290M or X42M |
0,22 |
0,45 |
1,30 |
0,025 |
0,015 |
0,05 |
0,05 |
0,04 |
e |
0,43 |
0,25 |
| L320M or X46M |
0,22 |
0,45 |
1,30 |
0,025 |
0,015 |
0,05 |
0,05 |
0,04 |
e |
0,43 |
0,25 |
| L360M or X52M |
0,22 |
0,45 |
1,40 |
0,025 |
0,015 |
d |
d |
d |
e |
0,43 |
0,25 |
| L390M or X56M |
0,22 |
0,45 |
1,40 |
0,025 |
0,015 |
d |
d |
d |
e |
0,43 |
0,25 |
| L415M or X60M |
0,12f |
0,45f |
1,60f |
0,025 |
0,015 |
g |
g |
g |
h |
0,43 |
0,25 |
| L450M or X65M |
0,12f |
0,45f |
1,60f |
0,025 |
0,015 |
g |
g |
g |
h |
0,43 |
0,25 |
| L485M or X70M |
0,12f |
0,45f |
1,70f |
0,025 |
0,015 |
g |
g |
g |
h |
0,43 |
0,25 |
| L555M or X80M |
0,12f |
0,45f |
1,85f |
0,025 |
0,015 |
g |
g |
g |
i |
0,43f |
0,25 |
| L625M or X90M |
0,10 |
0,55f |
2,10f |
0,020 |
0,010 |
g |
g |
g |
i |
--- |
0,25 |
| L690M or X100M |
0,10 |
0,55f |
2,10f |
0,020 |
0,010 |
g |
g |
g |
i,j |
0,25 |
| L830M or X120M |
0,10 |
0,55f |
2,10f |
0,020 |
0,010 |
g |
g |
g |
i,j |
0,25 |
Table 5 ---chemical composition for PSL 2 pipe with t ≤ 25,0 mm (0.984
in) (Continued)
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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. |
9.2 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. |
Requirements for the results of tensile tests for PSL 2 pipe
Table 7 |
| Pipe grade |
Pipe body of seamless and welded pipes |
Weld seam of HFW, SAW and COW pipes |
Yield strengtha
Rto,5b
MPa (psi) |
Tensile strengtha
Rm
MPa (psi) |
Ratioa,b,c
Rto,5/Rm |
Elongation
Af
% |
Tensile strengthd
Rm
MPa (psi) |
| minimum |
maximum |
minimum |
maximum |
maximum |
minimum |
minimum |
L245R or BR
L245N or BN
L245Q or BQ
L245M or BM |
245
(35 500) |
450 e
(65 300) e |
415
(60 200) |
760
(110 200) |
0,93 |
f |
415
(60 200) |
L290R or X42R
L290N or X42N
L290Q or X42Q
L290M or X42M |
290
(42 100) |
495
(71 800) |
415
(60 200) |
760
(110 200) |
0,93 |
f |
415
(60 200) |
L320N or X46N
L320Q or X46Q
L320M or X46M |
320
(46 400) |
525
(76 100) |
435
(63 100) |
760
(110 200) |
0,93 |
f |
435
(63 100) |
L360N or X52N
L360Q or X52Q
L360M or X52M |
360
(52 200) |
530
(76 900) |
460
(66 700) |
760
(110 200) |
0,93 |
f |
460
(66 700) |
L390N or X56N
L390Q or X56Q
L390M or X56M |
390
(56 600) |
545
(79 000) |
490
(71 100) |
760
(110 200) |
0,93 |
f |
490
(71 100) |
L415N or X60N
L415Q or X60Q
L415M or X60M |
415
(60 200) |
565
(81 900) |
520
(75 400) |
760
(110 200) |
0,93 |
f |
520
(75 400) |
L450Q or X65Q
L450M or X65M |
450
(65 300) |
600
(87 000) |
535
(77 600) |
760
(110 200) |
0,93 |
f |
535
(77 600) |
L485Q or X70Q
L485M or X70M |
485
(70 300) |
635
(92 100) |
570
(82 700) |
760
(110 200) |
0,93 |
f |
570
(82 700) |
L555Q or X80Q
L555M or X80M |
555
(80 500) |
705
(102 300) |
625
(90 600) |
825
(119 700) |
0,93 |
f |
625
(90 600) |
| L625M or X90M |
625
(90 600) |
775
(112 400) |
695
(100 800) |
915
(132 700) |
0,95 |
f |
695
(100 800) |
| L690M or X100M |
690
(100 100) |
840
(121 800) |
760
(110 200) |
990
(143 600) |
0,97 g |
f |
760
(110 200) |
| L830M or X120M |
830
(120 400) |
1 050
(152 300) |
915
(132 700) |
1 145
(166 100) |
0,99 g |
f |
915
(132 700) |
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Table 7 ----Requirements for the results of tensile tests for PSL 2 pipe (continued)
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).
g Lower Rto,5/Rm ratio values may be specified by agreement for L690 or X100 and
L830 or X120 pipe. |
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