The main difference between S500QL and S500QL1 steel plates lies in their low-temperature impact toughness requirements, specifically the test temperature: S500QL requires a minimum impact energy at -40°C, while S500QL1 requires it at a colder -60°C, making QL1 better suited for colder environments despite both having a 500 MPa yield strength and being quenched & tempered.
S500: High-strength structural steel with a minimum yield strength of 500 MPa.
Q: Indicates the delivery condition is "Quenched and Tempered".
L: Specifies the impact test is performed at a minimum of -40°C (40 Joules).
L1: Specifies the impact test is performed at a minimum of -60°C (40 Joules), indicating superior cold-toughness.
S500QL, S500QL1 steel chemical composition:
| C | Si | Mn | P | S | Ni | Cr | Mo | Cu | Nb | V | Ti | N | Zr | B |
| ≤0.2 | ≤0.8 | ≤1.7 | ≤0.025 | ≤0.015 | ≤2 | ≤1.5 | ≤0.7 | ≤0.5 | ≤0.06 | ≤0.12 | ≤0.05 | ≤0.015 | ≤0.15 | ≤0.005 |
Mechanical Property
|
Grade |
S500QL Mechanical Property |
|||||
|
Thickness |
Yield |
Tensile |
Elongation |
Min Impact Energy
|
||
|
S500 QL |
mm |
Min Mpa |
Mpa |
Min % |
-40 |
30J |
|
3<t≦50 |
500 |
590-770 |
17 |
-40 |
30J |
|
|
50<t≦100 |
480 |
590-770 |
17 |
-40 |
30J |
|
|
100<t≦150 |
440 |
540-720 |
17 |
-40 |
30J |
|
|
Grade |
S500QL1Mechanical Property |
|||||
|
Thickness |
Yield |
Tensile |
Elongation |
Min Impact Energy
|
||
|
S500 QL1 |
mm |
Min Mpa |
Mpa |
Min % |
-60 |
30J |
|
3<t≦50 |
500 |
590-770 |
17 |
-60 |
30J |
|
|
50<t≦100 |
480 |
590-770 |
17 |
-60 |
30J |
|
|
100<t≦150 |
440 |
540-720 |
17 |
-60 |
30J |
|
