P355QL1 is steels for pressure purposes —Part 6: Weldable fine grain steels,quenched and tempered steel for pressure purposed steel.
This EN10028-6 P355QL1steel sheet European standard covers the steel grades given in four series:
a)the basic series (P...Q)
b)series with elevated temperature properties(P...QH)
c) series with low temperature properties down to -40 °C (P...QL1);
d) series with low temperature properties down to -60 °C (P...QL2).
With increasing product thickness and strength level,P355QL1 material cold cracking can occur,caused by the following factors in combination.
-The amount of diffusible hydrogen in the weld metal
-microstructure of the heat affected zone
-tensile stress concentrations in the welded joint
EN10028-6 P355QL1 Chemical Composition
|
Grade |
Chemical Composition |
|
P355QL1 |
The Element Max (%) |
|
C |
Si |
Mn |
P |
S |
N |
B |
|
0.16 |
0.40 |
1.50 |
0.020 |
0.010 |
0.015 |
0.005 |
|
Mo |
Cu |
Nb |
Ni |
Ti |
V |
Zr |
|
0.25 |
0.30 |
0.05 |
0.50 |
0.03 |
0.06 |
0.05 |
Carbon Equivalent: Ceq = 【C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15】%
The P355QL1 steel products percentage of grain refining elements shall be at least 0.015%, Alumnium is also included in these elements.
The minimum content of 0.015% applies here to dissolved aluminium.This value is regarded as attained if the total aluminium content is at least 0.018%
EN10028-6 P355QL1 Mechanical Property
|
Grade |
Mechanical Property |
|
P355QL1 |
Thickness |
Yield |
Tensile |
Elongation |
|
mm |
Min Mpa |
Mpa |
Min % |
|
t≤50 |
355 |
490-630 |
22% |
|
50＜t≤100 |
335 |
490-630 |
22% |
|
100＜t≤150 |
315 |
450-590 |
22% |
As you can see,the P355QL1 steel plates Yield strength(Mpa) is 355Mpa, Tensile strength(Mpa) is 490-630 Elongation(%)Min:22%.
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