S890Q Steel Plate Explained: Chemical Composition, Mechanical Properties and Standards

S890Q is a high-strength quenched and tempered structural steel with a minimum yield strength of 890 MPa in its delivery condition .

The designation follows European standard nomenclature:

• S: Structural steel
• 890: Minimum yield strength (890 MPa)
• Q: Quenched and tempered delivery condition

 

This steel belongs to the EN 10025-6 family of high-strength structural steels and is commonly used in applications requiring extreme load-bearing capacity .

S890Q features a precisely controlled chemical composition designed to achieve its exceptional strength while maintaining good weldability and toughness:

S890Q steel plate complies with the following standards:

Primary Standard

EN 10025-6:2004: Technical delivery conditions for hot-rolled products of structural steels (high yield strength structural steels in quenched and tempered condition)

 

Additional Standards

EN 10137-2:1996: Delivery conditions for quenched and tempered plates/wide flats

Material number: 1.8940

Equivalent Chinese grade: Q890 (e.g., Q890C, Q890D)

S890Q's combination of high strength and toughness makes it ideal for heavy-duty structural applications including:

Mining equipment: Hydraulic supports, dump trucks

Heavy construction machinery: Excavators, cranes

Offshore structures: Drilling rigs, wind turbine supports

Bridge construction: High-load bearing components

Military vehicles: Armor plating and structural components

S890Q has limited but manageable weldability .

Welding requires careful attention to:

• Preheating to prevent cold cracking (due to its high carbon equivalent)
• Controlled cooling rates
• Post-weld heat treatment may be required for certain applications

General welding requirements follow EN 1011-2 standard , and specialized techniques may be necessary for thick sections.

S890Q steel plate stands out for its 890 MPa minimum yield strength, achieved through precise chemical composition and quenched and tempered heat treatment. It excels in applications demanding high strength-to-weight ratios and durability under extreme loading conditions.

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Q1: What is S890Q steel plate?

A:S890Q is a high-strength structural steel plate according to EN 10025-6, supplied in quenched and tempered (Q) condition, with a minimum yield strength of 890 MPa.

Q2: What is the material number of S890Q?

A:The European material number for S890Q is 1.8940.

Q3: Is S890Q considered non-alloy steel?

A:Yes. Under EN classification, S890Q is listed as non-alloy structural steel, although small alloying elements are added for strength and toughness control.

Q4: What thickness range is available for S890Q steel plate?

A:Common supply thickness ranges from 6 mm to 150 mm, depending on mill capability and standard requirements.

Q5: What are the mechanical properties of S890Q?

A:

Yield strength: ≥ 890 MPa (≤ 50 mm)

Tensile strength: 940–1100 MPa

Elongation: ≥ 11%

Impact test: ≥ 30 J at −20°C

Q6: Can S890Q steel be welded easily?

A:Yes, S890Q has good weldability, but welding must follow controlled procedures, including proper heat input, preheating (if required), and suitable filler materials.

Q7: What is the difference between S890Q and S890QL?

A:S890QL offers better low-temperature impact toughness than S890Q and is typically specified for colder environments or critical structures.

Q8: What are typical applications of S890Q steel plate?

A:S890Q is widely used in:

Cranes and lifting equipment

Bridges and heavy structures

Mining and earthmoving machinery

Wind power and offshore structures

Heavy-duty vehicle frames

Q9: Can S890Q replace S690Q to reduce weight?

A:Yes. Using S890Q instead of S690Q allows significant weight reduction while maintaining or increasing load capacity, which is especially valuable for mobile equipment.

Q10: What inspection and certificates are required for S890Q?

A:Standard supply includes EN 10204 3.1 MTC.

3.2 certificates, ultrasonic testing (UT), and third-party inspection (SGS, BV, TUV) are available upon request.

Q11: Is S890Q suitable for pressure vessel applications?

A:No. S890Q is a structural steel, not designed for pressure vessel or boiler applications. Pressure vessel steels must comply with specific PV standards such as EN 10028 or ASME.

Q12: What delivery condition is required for S890Q steel plate?

A:S890Q must be supplied in quenched and tempered (Q) condition as per EN 10025-6.

Q13: Can you cut or machine S890Q steel plate?

A:Yes. Flame cutting, plasma cutting, and machining are possible with controlled parameters to maintain material properties.

Q14: Does S890Q steel require special storage or handling?

A:Standard dry storage is sufficient. Surface protection can be added for long-term outdoor storage.