P500QL1 and P690QL1 are designations for high-strength, weldable, fine-grain steel plates conforming to the EN 10028-6 standard for pressure vessels and boilers, where 'P' denotes pressure, '500'/'690' indicates minimum yield strength (MPa), 'Q' means quenched and tempered, and 'L1' specifies low-temperature impact toughness (Charpy-V at -40°C with 27J minimum energy). They are used in demanding applications requiring high strength, weldability, and resistance to cold temperatures, with P690QL1 offering significantly higher strength than P500QL1.
Chemical Composition
|
P500QL1 Chemical Composition |
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|
Grade |
The Element Max (%) |
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|
C |
Si |
Mn |
P |
S |
N |
B |
|
|
P500QL1 |
0.18 |
0.60 |
1.70 |
0.020 |
0.010 |
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 |
|
|
P690QL1 Chemical Composition |
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|
Grade |
The Element Max (%) |
||||||
|
C |
Si |
Mn |
P |
S |
N |
B |
|
|
P690QL1 |
0.20 |
0.80 |
1.70 |
0.020 |
0.010 |
0.015 |
0.005 |
|
Mo |
Cu |
Nb |
Ni |
Ti |
V |
Cr |
|
|
0.70 |
0.3 |
0.06 |
2.50 |
0.05 |
0.12 |
1.50 |
|
Mechanical Property
|
Grade |
P500QL1 Mechanical Property |
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|
Thickness |
Yield |
Tensile |
Elongation |
|
|
P500QL1 |
mm |
Min Mpa |
Mpa |
Min % |
|
6-50 |
500 |
590-770 |
17% |
|
|
50-100 |
480 |
590-770 |
17% |
|
|
100-150 |
440 |
540-720 |
17% |
|
|
Grade |
P690QL1 Mechanical Property |
|||
|
Thickness |
Yield |
Tensile |
Elongation |
|
|
P690QL1 |
mm |
Min Mpa |
Mpa |
Min % |
|
6-50 |
690 |
770-940 |
14% |
|
|
50-100 |
670 |
770-940 |
14% |
|
|
100-150 |
630 |
720-900 |
14% |
|
Key Characteristics
Standard: EN 10028-6: Weldable fine grain steels for pressure purposes, quenched and tempered.
Material Type: High-strength low-alloy (HSLA) steel.
Processing: Quenched and Tempered (Q) for enhanced strength and toughness.
Temperature Rating: 'L1' signifies excellent impact strength at -40°C (27 Joules minimum).
Strength: P500QL1 has a minimum yield strength of 500 MPa, while P690QL1 has a minimum yield strength of 690 MPa.
Applications:
Pressure vessels and boilers.
Heavy machinery and construction.
Pipelines and storage tanks operating in cold environments.
