↵S890Q, S890QL, and S890QL1 are high-strength structural steels (EN 10025-6 standard) with a minimum yield strength of 890 MPa, differentiated by their required impact toughness at progressively lower temperatures: S890Q (basic -20°C), S890QL (better -40°C), and S890QL1 (superior -60°C), making them suitable for increasingly colder climates, all achieved through quenching and tempering (Q).
Common features include:
- Minimum yield strength of 890 MPa
- High tensile strength and excellent load resistance
- Quenched and tempered delivery condition
- Designed for demanding structural applications
The key differences lie in impact test temperature and toughness requirements.
Mechanical Properties Comparison
1. S890Q Steel Plate
Impact test temperature: –20°C
Typical use: Standard high-strength structural applications
Advantages: Cost-effective, widely used, good balance of strength and toughness
S890Q is suitable for heavy machinery, cranes, and structures operating in normal or moderately cold environments.
2. S890QL Steel Plate
Impact test temperature: –40°C
Typical use: Structures in colder climates or higher safety-demand projects
Advantages: Improved low-temperature toughness and crack resistance
S890QL provides a higher safety margin than S890Q, making it ideal for offshore platforms, wind energy structures, and cold-region construction.
3. S890QL1 Steel Plate
Impact test temperature: –60°C
Typical use: Extreme cold environments
Advantages: Superior toughness under extremely low temperatures
S890QL1 is used in Arctic, sub-zero, or highly demanding environments where structural integrity at very low temperatures is critical.
Toughness: The Key Differentiator (Q vs QL vs QL1)
The primary distinction lies in low-temperature toughness-a critical factor for applications in cold climates or harsh environments.
The suffixes "Q", "QL", and "QL1" denote increasing toughness requirements, measured by Charpy V-notch impact tests:
|
Grade |
Standard Impact Temperature |
Minimum Impact Energy (KV) |
Ideal Applications |
|---|---|---|---|
|
S890Q |
-20°C |
40 J |
Mild-temperature environments: construction machinery, bridge components, and general heavy engineering. |
|
S890QL |
-40°C |
60 J |
Cold regions: offshore structures, winter-resistant construction equipment, and mid-latitude wind turbines. |
|
S890QL1 |
-60°C |
60 J |
Extreme cold: Arctic/offshore oil platforms, high-altitude wind farms, and polar-region mining equipment. |
GNEE Steel's S890QL and S890QL1 use refined steelmaking processes (e.g., ladle refining, vacuum degassing) to reduce impurities, enhancing toughness without compromising strength. This makes our plates ideal for projects in harsh, low-temperature conditions.
Equivalent Grades: Global Standards Cross-Reference
For international projects, understanding equivalent grades is essential. Below is a quick reference for S890Q, S890QL, and S890QL1 across major standards-verified by GNEE Steel's technical team:
ASTM (USA): All three grades are equivalent to A514 Grade Q (quenched & tempered, ≥890 MPa yield strength).
JIS (Japan): Corresponding to SSAB Domex 100Q/QL/QL1 or JFE-HITEN 1000Q/QL.
GB (China): S890Q ≈ Q960C; S890QL ≈ Q960D; S890QL1 ≈ Q960E (per GB/T 16270).
EN (Europe): Directly covered by EN 10025-6, with QL/QL1 as upgraded toughness variants of Q.
How to Choose the Right Grade?
- Choose S890Q for standard high-strength structural applications
- Choose S890QL for cold climates or higher impact safety margins
- Choose S890QL1 for extreme low-temperature environments
If unsure, consulting a professional supplier can help avoid over-specification or underperformance.
Contact GNEE Steel Today
If you are sourcing S890Q, S890QL, or S890QL1 high-strength structural steel plates, GNEE Steel is your reliable partner. Contact us today for expert advice, fast quotations, and dependable global delivery.
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GNEE Steel also supplies a variety of high-strength steel plates, such as A514 Grade F, A572 Grade 50, A588 Grade A, S355JR, S690Q, SS400, S690QL, Q345B, Q345E, etc. If you want to know more about other types of steel plates, you can call the consultation hotline at +8615824687445 or send an email to alloy@gneesteelgroup.com. You are welcome to consult us, and we are very willing to answer your questions.
