EN 10025-6 S890Q Steel Plate | S890Q QT High Structural Steel
What is EN 10025-6 S890Q Steel Plate?
SHH STEEL is a professional China Mill-Direct Exporter of high-strength structural steel plates. We are pleased to offer EN 10025-6 S890Q Steel Plate (Material Number 1.8940), a quenched and tempered ultra-high-strength grade engineered for structural applications that require the highest levels of strength and weight reduction.
S890Q belongs to the family of EN 10025-6 steel plate products covering high-yield-strength steels in the quenched and tempered condition. After quenching and tempering, this grade achieves a minimum yield strength of 890 MPa (up to 50 mm thickness) while maintaining adequate impact toughness at –20°C. The refined tempered microstructure provides exceptional strength, making it ideal for mobile cranes, heavy lifting equipment and structures where reducing plate thickness and overall weight is essential.
SHH STEEL supplies S890Q plates in thicknesses ranging from 6 mm to 100 mm (thicker plates available on request), widths up to 3000–4000 mm and lengths up to 12000–18000 mm. Custom cutting, ultrasonic testing, surface treatment and third-party inspection services are available. Every plate is delivered with a full EN 10204 3.1 Mill Test Certificate, ensuring complete traceability from the producing mill.
Material Specification
| Parameter | Requirement / Availability |
|---|---|
| Governing Standard | EN 10025-6 |
| Steel Designation | S890Q (1.8940) |
| Delivery Condition | Quenched and Tempered (Q) |
| Product Form | Flat steel plate |
| Thickness Range | 6 mm – 100 mm (thicker plates on request) |
| Width / Length | Up to 3000–4000 mm / 12000–18000 mm |
| Certification | EN 10204 3.1 / 3.2 |
| Additional Testing | UT, Z-test, third-party inspection available |
Chemical Composition
Chemical composition is controlled in accordance with EN 10025-6 for both ladle (heat) analysis and product analysis.
Ladle Analysis (Cast Analysis)
| Element | Maximum (%) |
|---|---|
| Carbon (C) | 0.20 |
| Silicon (Si) | 0.80 |
| Manganese (Mn) | 1.70 |
| Phosphorus (P) | 0.025 |
| Sulfur (S) | 0.015 |
| Chromium (Cr) | 1.50 |
| Nickel (Ni) | 2.00 |
| Molybdenum (Mo) | 0.70 |
| Copper (Cu) | 0.50 |
| Niobium (Nb) | 0.06 |
| Vanadium (V) | 0.12 |
| Titanium (Ti) | 0.05 |
| Boron (B) | 0.005 |
| Nitrogen (N) | 0.015 |
Product Analysis
| Element | Maximum (%) |
|---|---|
| Carbon (C) | 0.22 |
| Silicon (Si) | 0.86 |
| Manganese (Mn) | 1.80 |
| Phosphorus (P) | 0.030 |
| Sulfur (S) | 0.017 |
| Chromium (Cr) | 1.60 |
| Nickel (Ni) | 2.10 |
| Molybdenum (Mo) | 0.74 |
| Copper (Cu) | 0.55 |
| Niobium (Nb) | 0.07 |
| Vanadium (V) | 0.14 |
| Titanium (Ti) | 0.06 |
| Boron (B) | 0.006 |
| Nitrogen (N) | 0.016 |
The carefully balanced alloying system ensures high hardenability required for ultra-high strength while keeping the carbon equivalent within a workable range for welding after quenching and tempering.
Mechanical Properties
| Nominal Thickness (mm) | Min. Yield Strength ReH | Tensile Strength Rm | Min. Elongation A | Impact Energy (longitudinal) |
|---|---|---|---|---|
| ≤ 50 | 890 MPa | 940 – 1100 MPa | 11 % | 30 J at –20 °C |
| 50 < t ≤ 100 | 830 MPa | 880 – 1100 MPa | 11 % | 30 J at –20 °C |
Density is approximately 7.85 g/cm³.
Delivery Conditions
All S890Q plates are supplied in the quenched and tempered condition as required by EN 10025-6. The quenching and tempering heat treatment is precisely controlled to achieve the ultra-high strength and required toughness.
Additional processing options available from SHH STEEL:
- Shot blasting and shop primer application
- Ultrasonic testing in accordance with EN 10160
- Through-thickness (Z-direction) testing to Z15, Z25 or Z35
- Independent third-party inspection (SGS, BV, TUV, Lloyd’s Register, etc.)
- Precision cutting (flame, plasma or water-jet)
Tolerances
EN 10025-6 S890Q Steel Plate dimensional tolerances are supplied in accordance with EN 10029. For S890Q QT High Structural Steel, customers may select the required class for thickness, width, length and flatness according to project needs. Both mill edges and cut edges (flame or plasma) are available for S890Q steel plate. Tighter tolerances for EN 10025-6 S890Q can be arranged by special agreement when required.
Weldability
S890Q is an ultra-high-strength quenched and tempered steel. Welding requires strict control of preheating, heat input and the exclusive use of matching low-hydrogen high-strength consumables to maintain toughness in the heat-affected zone.
Recommended welding consumables:
| Welding Process | Suggested Consumables |
|---|---|
| SMAW (Stick) | E11018-G, E12018-G |
| GMAW / MAG | ER110S-G, ER120S-G |
| FCAW | E111T1-G, E121T1-G |
| SAW | Matching ultra-high-strength wire and flux combinations |
Preheating is mandatory for most thicknesses. Interpass temperature must be carefully controlled, and post-weld heat treatment is frequently required for critical or highly stressed components.
Equivalent Material Grades
| Grade | Standard | Remarks |
|---|---|---|
| S890Q | EN 10025-6 | Primary designation |
| 1.8940 | EN | Material number |
| Q890D / Q890E | GB/T 1591 | Closest Chinese equivalents |
| A514 / Weldox 900 | ASTM / SSAB | Similar ultra-high-strength QT concept |
| StE 890 V | Former DIN | Historical related grade |
Applications
EN 10025-6 S890Q is selected when maximum strength and significant weight reduction are required. Typical applications include:
| Application Area | Typical Components / Keywords |
|---|---|
| Mobile Cranes & Lifting | Boom structures, telescopic arms – S890Q Crane |
| Heavy Construction | High-load frames, columns – S890Q Structural Steel |
| Mining & Earthmoving Equipment | Chassis, boom structures – S890Q Mining |
| Offshore & Marine | Lifting equipment, platform components – S890Q Offshore |
| Energy & Power | Heavy fabrications, special structures – S890Q Energy |
| General Heavy Fabrication | Ultra-high-strength welded assemblies – S890Q Fabrication |
Why Choose SHH STEEL
SHH STEEL is a China Mill-Direct Exporter. We maintain long-term strategic cooperation with major Chinese steel mills and act as a first-level agent. This direct supply model allows us to offer competitive mill-direct pricing, shorter lead times, consistent quality and full Mill Test Certificates (EN 10204 3.1 / 3.2) for EN 10025-6 S890Q Steel Plate.
Our experienced export and technical teams provide support on material selection, welding procedures, cutting and processing. Customers benefit from reliable supply and professional service for ultra-high-strength quenched and tempered steel projects worldwide.
FAQ
- What does “Q” mean in S890Q?“Q” indicates the quenched and tempered condition and impact testing at –20°C.
- What is the difference between S890Q and S890QL?Both grades have the same strength level. S890Q is impact tested at –20°C, while S890QL is tested at –40°C and offers higher toughness for colder service.
- What is the material number of S890Q?1.8940
Conclusion
EN 10025-6 S890Q (1.8940) quenched and tempered steel plate from SHH STEEL provides an ultra-high yield strength of 890 MPa combined with reliable toughness at –20°C. As a China Mill-Direct Exporter, we offer competitive pricing, consistent quality and full technical support. Contact SHH STEEL today for stock availability, pricing or processing services.
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