P355Q and P460Q are European standard (EN 10028-6) weldable, fine-grain structural steels, heat-treated (quenched and tempered) for high-strength pressure vessel applications, with the 'Q' indicating quenching, and the numbers (355/460) referring to their minimum yield strength in MPa, meaning P460Q offers significantly higher strength for demanding conditions than P355Q, both providing excellent toughness and weldability for equipment like boilers and tanks.
Chemical Composition
|
P355Q Chemical Composition |
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|
Grade |
The Element Max (%) |
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|
C |
Si |
Mn |
P |
S |
N |
B |
|
|
P355Q |
0.16 |
0.4 |
1.5 |
0.025 |
0.015 |
0.015 |
0.005 |
|
Mo |
Cu |
Nb |
Ni |
Ti |
V |
Zr |
|
|
0.25 |
0.3 |
0.05 |
0.5 |
0.03 |
0.06 |
0.05 |
|
|
P460Q Chemical Composition |
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|
Grade |
The Element Max (%) |
||||||
|
C |
Si |
Mn |
P |
S |
N |
B |
|
|
P460Q |
0.18 |
0.50 |
1.70 |
0.025 |
0.015 |
0.015 |
0.005 |
|
Mo |
Cu |
Nb |
Ni |
Ti |
V |
Zr |
|
|
0.50 |
0.3 |
0.05 |
0.5 |
0.03 |
0.06 |
0.05 |
|
Mechanical Property
|
Grade |
P355Q Mechanical Property |
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|
Thickness |
Yield |
Tensile |
Elongation |
|
|
P355Q |
mm |
Min Mpa |
Mpa |
Min % |
|
6-50 |
355 |
490-630 |
22% |
|
|
50-100 |
335 |
490-630 |
22% |
|
|
100-150 |
315 |
450-590 |
22% |
|
|
Grade |
P460Q Mechanical Property |
|||
|
Thickness |
Yield |
Tensile |
Elongation |
|
|
P460Q |
mm |
Min Mpa |
Mpa |
Min % |
|
6-50 |
460 |
550-720 |
19% |
|
|
50-100 |
440 |
550-720 |
19% |
|
|
100-150 |
400 |
500-670 |
19% |
|
Key Characteristics:
Standard: EN 10028-6 (for pressure equipment).
Type: Weldable fine grain structural steels.
Treatment: Quenched and Tempered (Q).
Application: Boilers, pressure vessels, storage tanks, pipelines.
Comparison:
P355Q: Minimum yield strength of 355 MPa, good for general pressure equipment.
P460Q: Minimum yield strength of 460 MPa (and tensile up to 460 MPa), offering higher strength for more demanding loads, suitable for critical parts.
