Seamless line pipe is produced to comply with the specifications API 5L PSL1 and PSL2, ASTM A106 and ASTM A53.
Steel Grades
Three basic steel grades are used for the production of the different grades of material in the API 5L specification. The main chemical elements will comply with the maximum limits.
Chemical Composition API 5L (PSL 1)
GRADE |
C |
Mn |
S |
P |
B |
0,20% |
1,05% |
0,030% |
0,030% |
X42 |
0,20% |
1,05% |
0,030% |
0,030% |
X52 |
0,20% |
1,40% |
0,030% |
0,030% |
Chemical Composition API 5L (PSL 2)
GRADE |
C |
Mn |
S |
P |
B |
0,20% |
1,05% |
0,015% |
0,025% |
X42 |
0,20% |
1,05% |
0,015% |
0,025% |
X52 |
0,20% |
1,40% |
0,015% |
0,025% |
Dimensional Tolerances
CRITERIA |
MINUS |
PLUS |
OD Body |
0,75% of nominal |
0,75% of nominal |
OD Ends |
0,4 mm |
1,59mm |
Wall Thickness |
12,5% of nominal |
15% of nominal |
Lengths,
cutting tolerance |
0mm |
0mm 50mm |
Mass, per carload |
3,5% |
6,5% |
Mass, per Tube |
1,75% |
|
The dimensional tolerance used are in strict accordance with the API 5L specification.
Mechanical Properties
Steel
Grade |
Ultimate
Tensile
Strength [MPa] |
Specified
Min. Yield
Strength [MPa] |
% Elongation |
B |
414 min |
241 min |
To formula
in API 5L |
X42 |
413 min |
289 min |
X52 |
455 min |
358 min |
Line pipe is in accordance with the API 5L requirement for mechanical properties.