P500QH and P500Q are grades of weldable, fine-grain, quenched and tempered (Q&T) steel under the EN 10028-6 standard, used for pressure vessels and boilers, with the key difference being the 'H' in P500QH indicating a lower service temperature and specific impact energy compared to P500Q. Both offer good weldability and strength for demanding applications, but P500QH offers enhanced low-temperature toughness.
Chemical Composition
|
P500Q Chemical Composition |
|||||||
|
Grade |
The Element Max (%) |
||||||
|
C |
Si |
Mn |
P |
S |
N |
B |
|
|
P500Q |
0.18 |
0.60 |
1.70 |
0.025 |
0.015 |
0.015 |
0.005 |
|
Mo |
Cu |
Nb |
Ni |
Ti |
V |
Cr |
|
|
0.70 |
0.3 |
0.05 |
1.50 |
0.05 |
0.08 |
1.00 |
|
|
P500QH Chemical Composition |
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|
Grade |
The Element Max (%) |
||||||
|
C |
Si |
Mn |
P |
S |
N |
B |
|
|
P500QH |
0.18 |
0.60 |
1.70 |
0.025 |
0.015 |
0.015 |
0.005 |
|
Mo |
Cu |
Nb |
Ni |
Ti |
V |
Cr |
|
|
0.70 |
0.3 |
0.05 |
1.50 |
0.05 |
0.08 |
1.00 |
|
Mechanical Property
|
Grade |
P500QH Mechanical Property |
|||
|
Thickness |
Yield |
Tensile |
Elongation |
|
|
P500QH |
mm |
Min Mpa |
Mpa |
Min % |
|
6-50 |
500 |
590-770 |
17% |
|
|
50-100 |
480 |
590-770 |
17% |
|
|
100-150 |
440 |
540-720 |
17% |
|
|
Grade |
P500Q Mechanical Property |
|||
|
Thickness |
Yield |
Tensile |
Elongation |
|
|
P500Q |
mm |
Min Mpa |
Mpa |
Min % |
|
6-50 |
500 |
590-770 |
17% |
|
|
50-100 |
480 |
590-770 |
17% |
|
|
100-150 |
440 |
540-720 |
17% |
|
P500QH
Type: Quenched & Tempered (Q&T) Steel.
Standard: EN 10028-6.
Key Feature: 'H' signifies specific low-temperature performance, generally tested at -20°C with a 27 Joule impact energy.
Usage: High-strength applications in high-temperature equipment, pressure vessels, and boilers needing low-temperature fracture resistance.
P500Q
Type: Also Q&T steel for pressure purposes.
Standard: EN 10028-6.
Key Feature: The base grade, with variations like P500QH, P500QL1, P500QL2 defining different temperature/impact requirements.
Usage: Similar to P500QH, for pressure equipment, with the specific 'Q' variant determining suitability for different operating temperatures.
