API 5L Gr.B/L245 steel plate meaning: The two digit number following the "X" indicates the Minimum Yield Strength (in 000's psi) of pipe produced to this grade. X42 has the minimum yield strength of 42 kilopound/square inch and X52 has the 52 ksi.
ASTM A106 pipe is the standard specification for A106 Gr.B seamless carbon Steel pipe for high-temperature and pressures service.
API 5L standard has PSL1 and PSL2 two product specifications, they are different on chemical composition, manufacturing processes, mechanical strength, heat treatment, test records, traceability etc. Below is the API 5L PSL1 X42 steel technical requirements.
Chemical composition of API 5L Gr.B/L245 steel and A106 Gr.B steel
Standards |
C max % |
Mn max% |
S max % |
Si min % |
Cr max % |
Cu max % |
|
A106 Gr.B |
0.30 |
0.29-1.06 |
0.035 |
0.10 |
0.40 |
0.40 |
|
API 5L Gr.B/L245 |
0.28 |
1.20 |
0.030 |
/ |
0.50 |
0.50 |
Tensile Requirement of Chemical composition of API 5L Gr.B/L245 steel and A106 Gr.B steel
Standards |
Tensile Strength Mpa |
Yield Strength Mpa |
Elongation % |
|
A106 Gr.B |
≥415 |
≥240 |
20 |
|
API 5L Gr.B/L245 |
≥415 |
≥245 |
23 |
The two pipe specifications overlap but vary. A Pipe may or may not meet both API 5L Gr.B and A106 Gr.b. Equivalent standards of them listed below:
Standard |
Seamless |
WELDED |
Other standards |
|
API 5L Line Pipe B/L245 |
EN 10216-1 P265 |
EN 10217-1 P265 |
BS 3601 430 |
|
A106 Gr.B |
EN 10216-2 P265GH |
/ |
BS 3601 430 |
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