S550Q is a kind of quenched and tempered low - alloy high - strength structural steel that complies with the European standard EN 10025 - 6, with its material number being 1.8904. Each letter and number in its grade has a specific meaning: "S" stands for structural steel, "550" indicates that its yield strength can reach 550MPa, and "Q" means it maintains good impact performance at -20℃.
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Gangsteel Grade : |
EN10025-6 S550Q |
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Specification (mm) |
THK: 3 to 300, Width: 1500 to 4050, Length: 3000 to 27000 |
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Standard: |
Technical delivery conditions for flat products of high yield strength structural steels in the quenched and tempered condition |
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Approval By Third Party |
ABS, DNV, GL, CCS, LR , RINA, KR, TUV, CE |
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Classification: |
Hot rolled products of structural steels |
Supplementary Technology: HIC Test | NACE MR0175 | Z15 | Z25 | Z35|
Gangsteel is specialized in supplying EN10025-6 steel plate in S550 Q. For more information of S550Q steel plates, please check them in following:
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S550QChemical Composition |
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Grade |
The Element Max (%) |
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C |
Si |
Mn |
P |
S |
N |
B |
Cr |
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S550 Q |
0.20 |
0.80 |
1.70 |
0.020-0.025 |
0.010-0.015 |
0.015 |
0.005 |
1.50 |
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Cu |
Mo |
Nb |
Ni |
Ti |
V |
Zr |
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0.50 |
0.70 |
0.06 |
2.0 |
0.05 |
0.12 |
0.15 |
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Carbon Equivalent: Ceq = 【C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15】%
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Grade |
S550QMechanical Property |
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Thickness |
Yield |
Tensile |
Elongation |
Min Impact Energy
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S550 Q |
mm |
Min Mpa |
Mpa |
Min % |
-20 |
30J |
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3 |
550 |
640-820 |
16 |
-20 |
30J |
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50 |
530 |
640-820 |
16 |
-20 |
30J |
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100 |
490 |
590-770 |
16 |
-20 |
30J |
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Shipbuilding steel plate| Alloy steel plates| High strength plate| Carbon steel plate| Stainless steel plate
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Equivalent steel grade of S550Q |
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Europe |
Germany |
France |
Sweden |
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FeE 550 V |
StE550V |
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Common Specifications and Delivery Status:
Its common thickness ranges from 8 - 280mm, width from 1600 - 4020mm, and length from 6000 - 17500mm. It is usually delivered after quenching and tempering. If customers have special needs, they can also negotiate with suppliers to add flaw detection, Z-direction performance and other requirements, which need to be specified in the contract.
Typical Applications:
Thanks to its excellent high - strength and low - temperature impact performance, it is widely used in the manufacturing of key components requiring low - temperature resistance and high strength. It is a common material for hydropower stations and hydraulic turbines. Meanwhile, it is also applied in power transmission towers, oil derricks, port machinery, heavy - duty automobile structures and high - rise building load - bearing components.
What do the letters and numbers in the S550Q grade mean, and which standard does it comply with?
S550Q adheres to the European standard EN 10025-6 for quenched and tempered high-strength structural steel. "S" denotes structural steel, "550" indicates a minimum yield strength of 550MPa (for 3–50mm thick plates), and "Q" signifies quenched-and-tempered delivery while guaranteeing ≥30J impact energy at -20°C . Its material number is 1.8904, enabling easy identification in industrial applications.
What are the key chemical and mechanical properties of S550Q?
Chemically, it uses a low-carbon design (C≤0.20%) with strict impurity control (P≤0.025%, S≤0.015%) and adds Cr (≤1.50%), Mo (≤0.70%), and Nb/Ti for grain refinement . Mechanically, 3–50mm plates have 550MPa yield strength and 640–820MPa tensile strength; even at 100–150mm thickness, yield strength remains ≥490MPa, with elongation ≥16% and -20°C impact energy ≥30J .