S890QL High-Strength Quenched & Tempered Steel
S890QL Quenched & Tempered High-Strength Steel (EN 10025-6) – Data & Equivalents
Detailed material data for S890QL low-alloy high-strength steel coil: chemical composition, mechanical properties, thermal and electrical physical properties, international equivalents and similar grades, application guide.
Welding, cold forming, hot forming, machining, cutting
- Phone : +8618037372205
- Email : [email protected]
- WhatsApp: Contact via Whtsapp
- WeChat: +8618037372205
S890QL High-Strength Quenched & Tempered Steel Introduction
S890QL is a fine-grain structural steel delivered in the quenched and tempered (Q) condition, complying with EN 10025-6.
It offers a minimum yield strength of 890 MPa and excellent notch toughness down to -40°C, classified by the 'L' designation.
Key features include:
- High strength-to-weight ratio for lightweight yet robust structures
- Good weldability under appropriate heat control
- Reliable low-temperature impact properties
- Typical delivery as heavy plates, coils, strips and flats
S890QL High-Strength Quenched & Tempered Steel Chemical Composition
The chemical composition of S890QL is defined by EN 10025-6. The steel is fully killed and fine grain treated. Maximum values are given for ladle analysis; product analysis tolerances apply as per the standard. The combination of microalloying elements (Nb, V, Ti, B) provides high strength and keeps weldability acceptable when proper procedures are followed.
| Chemical Element | Standard Value (mass%) | Remarks |
|---|---|---|
| C | ≤0.20 | Ladle analysis maximum |
| Si | ≤0.80 | Ladle analysis maximum |
| Mn | ≤1.70 | Ladle analysis maximum |
| P | ≤0.020 | Ladle analysis maximum |
| S | ≤0.010 | Ladle analysis maximum |
| N | ≤0.015 | Ladle analysis maximum |
| B | ≤0.0050 | Ladle analysis maximum |
| Cr | ≤1.50 | Ladle analysis maximum |
| Cu | ≤0.50 | Ladle analysis maximum |
| Mo | ≤0.70 | Ladle analysis maximum |
| Nb | ≤0.06 | Ladle analysis maximum |
| Ni | ≤2.0 | Ladle analysis maximum |
| Ti | ≤0.05 | Ladle analysis maximum |
| V | ≤0.12 | Ladle analysis maximum |
S890QL High-Strength Quenched & Tempered Steel Thermal and Electrical Physical Properties
The following physical properties are typical reference values for a quenched and tempered low-alloy steel like S890QL at room temperature. Actual values may slightly vary depending on exact composition and heat treatment. These are not mandatory standard requirements but are useful for engineering calculations.
| Physical Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | 20°C |
| Modulus of elasticity (E) | 210 | GPa | 20°C |
| Shear modulus (G) | ~80 | GPa | 20°C (calculated) |
| Poisson's ratio (ν) | 0.3 | - | 20°C |
| Thermal expansion coefficient (α) | 11.7 ×10⁻⁶ | /K | 20 – 100°C |
| Thermal conductivity (λ) | ~50 | W/(m·K) | 20°C |
| Specific heat capacity (cp) | 460 | J/(kg·K) | 20°C |
| Electrical resistivity (ρe) | 0.25 | µΩ·m | 20°C |
S890QL High-Strength Quenched & Tempered Steel Mechanical Properties
Mechanical properties are guaranteed in the quenched and tempered condition for longitudinal specimens. Values depend on product thickness. Yield strength, tensile strength, elongation, bend performance and Charpy impact energy at -40°C are mandatory. Typical test directions and conditions are indicated.
| Property | Required Value | Unit | Test Condition |
|---|---|---|---|
| ReH (Yield strength) | ≥890 | MPa | Thickness ≤ 50 mm; longitudinal |
| ReH (Yield strength) | ≥830 | MPa | Thickness > 50 ≤ 100 mm; longitudinal |
| ReH (Yield strength) | ≥790 | MPa | Thickness > 100 ≤ 150 mm; longitudinal |
| Rm (Tensile strength) | 940 – 1100 | MPa | Thickness ≤ 50 mm; longitudinal |
| Rm (Tensile strength) | 880 – 1100 | MPa | Thickness > 50 ≤ 100 mm; longitudinal |
| Rm (Tensile strength) | 830 – 1100 | MPa | Thickness > 100 ≤ 150 mm; longitudinal |
| A (Elongation after fracture, L0=5.65√S0) | ≥11 | % | All thicknesses ≤ 150 mm; longitudinal |
| Bend test (180°, d=4a) | No cracks | - | Thickness ≤ 50 mm; longitudinal; bend axis perpendicular to rolling direction |
| KV (Charpy V-notch impact energy) | ≥30 | J | -40°C, longitudinal, all thicknesses |
S890QL High-Strength Quenched & Tempered Steel Fully Equivalent Grades – Direct Replacement Options
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10025-6 | S890QL | Identical standard and grade |
| Germany | DIN EN 10025-6 | S890QL | Adopted European standard |
| United Kingdom | BS EN 10025-6 | S890QL | Adopted European standard |
| France | NF EN 10025-6 | S890QL | Adopted European standard |
| Italy | UNI EN 10025-6 | S890QL | Adopted European standard |
| International | ISO 4951-2 | S890QL | Corresponding international grade |
| China | GB/T 16270 | Q890E | Equivalent yield strength (≥890 MPa) and -40°C impact toughness; fine grain quenched & tempered |
S890QL High-Strength Quenched & Tempered Steel Application Introduction
S890QL is specifically designed for welded structures that demand extreme strength, light weight and good low‑temperature toughness. Typical industries and products include:
Product Applications: Telescopic crane booms, Heavy lift rig components, Bridge girders and box sections, Offshore platform legs and deck structures, Penstocks and high‑pressure pipelines, Mining truck chassis
Processed into products: Crane boom sections, outriggers, slewing rings, High‑strength structural plates and stiffeners, Welded I‑ and hollow sections for dynamic loads, Brackets, lugs and pinned connections in heavy machinery, Chassis rails and subframes of heavy‑duty vehicles, Pressure vessel shells and heads
Application industries: Lifting and mobile crane construction, Heavy-duty truck and trailer manufacturing, Mining and earth‑moving equipment, Offshore and marine engineering, Bridge and structural engineering, Pressure vessel and tank fabrication, Wind energy (tower sections, foundations)
S890QL High-Strength Quenched & Tempered Steel Similar / Alternative Materials with Proximate Performance
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10025-6 | S890Q | Same strength, but only 0°C impact (letter 'L' missing); not for low‑temperature service |
| Europe | EN 10025-6 | S960QL | Higher yield strength (960 MPa), similar toughness; higher carbon equivalent, requires more care in welding |
| USA | ASTM A514 | Grade Q | 690 MPa quenched & tempered alloy steel; lower strength but comparable concept; check suitability for specific thickness |
| Japan | JIS G 3128 | SHY685 | Yield ~685 MPa, used for high‑strength structures; not a direct match; verify chemical/mechanical requirements |
| International | ISO 4951-2 | S890Q | Lower toughness class (27 J at -20°C); may be acceptable if low‑temperature requirements are relaxed |
Notes:
Welding: S890QL can be welded with all common arc welding processes when using low‑hydrogen electrodes and appropriate preheat (typically 150–200°C, depending on thickness). The maximum heat input and interpass temperature must be controlled to avoid softening in the heat‑affected zone.
Forming: Cold forming is possible but requires adequate press capacity because of the high strength. Hot forming should be followed by a new quench and temper treatment to restore mechanical properties.
CEV: The carbon equivalent value (CEV) is usually ≤ 0.65%, which aids weldability. Always consult the manufacturer's data for specific heat treatment and processing recommendations.
- Share
