P460QL1 and P690QL1 are high-strength, fine-grain steel grades from the EN 10028-6 standard, designed for weldable pressure vessels and high-temperature equipment, differing mainly in strength: P460QL1 has a minimum yield strength of 460 MPa, while P690QL1 offers a higher 690 MPa, both heat-treated (Quenched and Tempered - 'QL') for low-temperature toughness (-40°C).
Chemical Composition
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P460QL1 Chemical Composition |
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|
Grade |
The Element Max (%) |
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|
C |
Si |
Mn |
P |
S |
N |
B |
|
|
P460QL1 |
0.18 |
0.50 |
1.70 |
0.020 |
0.010 |
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 |
|
|
P690QL1 Chemical Composition |
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|
Grade |
The Element Max (%) |
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|
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 |
P460QL1 Mechanical Property |
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|
Thickness |
Yield |
Tensile |
Elongation |
|
|
P460QL1 |
mm |
Min Mpa |
Mpa |
Min % |
|
6-50 |
460 |
550-720 |
19% |
|
|
50-100 |
440 |
550-720 |
19% |
|
|
100-150 |
400 |
500-670 |
19% |
|
|
Grade |
P690QL1 Mechanical Property |
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|
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 & Differences
Standard: Both fall under EN 10028-6, specifying weldable steels for pressure purposes.
Heat Treatment: 'Q' means Quenched, 'L' denotes Low-temperature toughness (specifically -40°C impact test), and '1' indicates specific impact energy (e.g., 27J).
Strength: The number indicates minimum yield strength: P460QL1 (460 MPa) vs. P690QL1 (690 MPa).
Application: Used in demanding high-temperature, high-pressure environments like boilers and pressure vessels, where good weldability is crucial.
