The main difference between P355ML1 and P355ML2 steel is the minimum impact energy requirement, with P355ML2 requiring a higher level of impact toughness at lower temperatures than P355ML1. This is because P355ML2 is specifically designed for low-temperature applications, such as pressure vessels, while P355ML1 is a general-purpose steel grade with a less stringent requirement for its impact properties.
Chemical Composition of P355ML1
|
Chemical Composition |
|||||||
|
Grade |
The Element Max (%) |
||||||
|
C |
Si |
Mn |
P |
S |
Al |
N |
|
|
P355ML1 |
0,14 |
0,50 |
1,60 |
0,020 |
0,015 |
0,020 |
0,015 |
|
Nb |
V |
Ti |
Ni |
Mo |
|
|
|
|
0,05 |
0,10 |
0,05 |
0,50 |
0,20 |
|
|
|
Carbon Equivalent: Ceq = 【C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15】%
Chemical Composition of P355ML2
|
Chemical Composition |
|||||||
|
Grade |
The Element Max (%) |
||||||
|
C |
Si |
Mn |
P |
S |
Al |
N |
|
|
P355ML2 |
0,14 |
0,50 |
1,60 |
0,020 |
0,015 |
0,020 |
0,015 |
|
Nb |
V |
Ti |
Ni |
Mo |
|
|
|
|
0,05 |
0,10 |
0,05 |
0,50 |
0,20 |
|
|
|
Carbon Equivalent: Ceq = 【C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15】%
Mechanical Property of P355ML1
|
Grade |
Mechanical Property |
|||
|
Thickness |
Yield |
Tensile |
Elongation |
|
|
P355ML1 |
mm |
Min Mpa |
Mpa |
Min % |
|
6-16 |
355 |
450-610 |
22% |
|
|
16-40 |
355 |
450-610 |
22% |
|
|
40-63 |
345 |
450-610 |
22% |
|
Mechanical Property of P355ML2
|
Grade |
Mechanical Property |
|||
|
Thickness |
Yield |
Tensile |
Elongation |
|
|
P355ML2 |
mm |
Min Mpa |
Mpa |
Min % |
|
6-16 |
355 |
450-610 |
22% |
|
|
16-40 |
355 |
450-610 |
22% |
|
|
40-63 |
345 |
450-610 |
22% |
|
