What are the typical application fields of S890Q?
S890Q, a high-strength, quenched & tempered fine-grained steel, is used in highly stressed welded structures like cranes, heavy vehicles, mining equipment, and pressure vessels, requiring excellent strength, toughness, and weldability, found in industries from heavy machinery to offshore platforms. Its applications also extend to bridges, large construction, and specialized piping systems, where its performance at low temperatures and high load capacity are critical.
S890Q is a high-yield, structural steel grade produced in compliance with the European standard EN 10025-6. As a quenched and tempered (Q) steel, it is engineered to provide an extraordinary balance of high strength, toughness, and weldability. The "890" in its designation refers to its minimum yield strength of 890 megapascals (MPa) for plate thicknesses up to 50mm. This material is categorized as a fine-grain structural steel, which means its microstructure is carefully controlled during the heating and cooling processes to ensure uniform mechanical properties throughout the plate.
The production of S890Q involves a sophisticated quenching and tempering heat treatment. Quenching involves heating the steel above its critical temperature and then rapidly cooling it in water or oil to increase hardness. This is followed by tempering, where the steel is reheated to a lower temperature to restore ductility and reduce brittleness. This dual process allows S890Q to achieve a tensile strength ranging from 940 to 1100 MPa, making it significantly stronger than standard carbon steels while maintaining the flexibility required for complex fabrication.
From a chemical perspective, S890Q maintains a low carbon equivalent value (CEV), which is crucial for its weldability. By limiting elements like carbon, manganese, and silicon, and adding micro-alloying elements such as chromium, molybdenum, and nickel, manufacturers can ensure that the steel remains robust even after welding. This precision in chemical composition prevents cold cracking and ensures that the heat-affected zone (HAZ) retains its structural integrity, which is a vital consideration for engineers designing high-stress components.
S890Q is a European-standard (EN 10025-6) high-yield strength quenched and tempered structural steel, known for its extreme load-bearing capacity, with 'S' for structural, '890' for its minimum 890 MPa yield strength, and 'Q' for its quenched/tempered delivery condition, used in heavy machinery, cranes, and bridges for its excellent strength-to-weight ratio.
Key Characteristics
Type: Fine-grain, high-strength structural steel.
Standard: EN 10025-6, also equivalent to Chinese Q890 grade.
Processing: Delivered in a quenched and tempered (Q+T) condition for enhanced mechanical properties.
Strength: Minimum yield strength of 890 MPa, offering high structural performance.
Impact Toughness: Tested for low-temperature impact resistance (e.g., down to -20°C for S890Q, with S890QL/QL1 offering lower temperatures).
Common Applications
-Heavy construction and mining equipment (excavators, loaders, dump trucks).
-Cranes and lifting equipment.
-Offshore structures (drilling rigs, wind mill supports).
-Bridges and trestles.
Benefits
Excellent strength-to-weight ratio, allowing for lighter, stronger designs.
Good weldability, machinability, and formability for complex components.
What is S890Q equivalent to?
S890Q is a European high-yield strength structural steel (EN 10025-6) with a minimum yield strength of 890 MPa, often equivalent to Chinese Q890 steel, and is used for heavy-duty applications, with variations like S890QL (for -50°C impact) and S890QL1 (for -60°C impact) also available, similar in function to other quenched and tempered (Q&T) high-strength steels.
What is the composition of S890Q?
S890Q is a high-strength, weldable fine-grained structural steel (EN 10025-6 standard) quenched and tempered for high-load applications, with a typical composition including maximums for Carbon (C), Phosphorus (P), Sulfur (S), and smaller additions of Silicon (Si), Manganese (Mn), Chromium (Cr), Molybdenum (Mo), Nickel (Ni), Vanadium (V), Copper (Cu), Aluminum (Al), Niobium (Nb), and Titanium (Ti) to achieve properties like 890 MPa yield strength. Key elements are generally limited to ~0.20% C, ~0.80% Si, ~1.70% Mn, ~0.025% P, and ~0.015% S, with alloying elements like Mo, Cr, Ni, and V providing strength.
What are the primary advantages of S890Q?
S890Q's primary advantages are its exceptional high yield strength (≥890 MPa) and excellent toughness, enabling significant weight reduction, cost savings (due to less material, transport), greater design freedom (thinner elements, longer spans), and improved performance in heavy-load applications like cranes, bridges, and heavy machinery, despite needing careful handling during welding due to its high strength.
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Gneesteel Grade : |
EN10025-6 S890Q |
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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 |
Chemical composition % of steel S890Q (1.8940): EN 10025-6-2004
| C | Si | Mn | Ni | P | S | Cr | Mo | V | N | Nb | Ti | Cu | Zr | B | CEV |
| max 0.2 | max 0.8 | max 1.7 | max 2 | max 0.025 | max 0.015 | max 1.5 | max 0.7 | max 0.12 | max 0.015 | max 0.06 | max 0.05 | max 0.5 | max 0.15 | max 0.005 | max 0.82 |
Mechanical properties of steel S890Q (1.8940)
| Nominal thickness (mm): | 3 - 50 | 50 - 100 |
| Rm - Tensile strength (MPa) | 940-1100 | 880-1100 |
| Nominal thickness (mm): | 3 - 50 | 50 - 100 |
| ReH - Minimum yield strength (MPa) | 890 | 830 |
| KV - Impact energy (J) longitud., | 0° 40 |
-20° 30 |
| A - Min. elongation Lo = 5,65 √ So (%) | 11 |
1 What is the hardness of S890Q?
S890Q is a high-strength structural steel with a minimum yield strength of 890 MPa, delivered in a quenched and tempered (Q) condition, but its specific hardness (Brinell or Rockwell) isn't a single fixed number; it's typically very high, often around 260-320 HBW (Brinell) or higher, depending on the exact thickness and supplier, reflecting its extreme strength, with values generally exceeding 900 MPa tens
2 What are common testing requirements for S890Q?
Common testing for S890Q steel involves mandatory tensile tests (yield/tensile strength, elongation) and Charpy V-notch impact tests (typically at -20°C for 30J) per heat/batch, conforming to EN 10025-6, along with heat analysis, with optional ultrasonic testing (UT) or product analysis. Tests are done on longitudinal specimens (impact) or transverse (tensile for thinner plates), ensuring mechanical properties and chemical composition meet standards for this high-strength, quenched & tempered steel used in heavy machinery and structures.
3 What is the P number of S890Q?
For S890Q high-strength structural steel, the P-number in welding (per ASME/AWS standards) typically places it in P-Number 1 (P1), as it's a low-alloy, quenched and tempered steel, often grouped with other carbon steels, though sometimes specific P-numbers like P91 might apply for higher-alloy versions, but standard S890Q falls into the general P1 category for its basic composition.
4 What welding rod for S890Q?
For welding S890Q high-strength steel, you need a high-strength filler metal matching its yield strength (890 MPa), with common choices including TIG rods like ER120S-1 (AWS A5.28, EN ISO 16834-A: W 89 5 I1 Mn4Ni2CrMo) or stick electrodes such as E9018-M or equivalent high-strength low-alloy (HSLA) types, designed for quenched & tempered steels, ensuring excellent toughness and mechanical properties, often with Nickel/Molybdenum/Chromium alloying. Always follow codes (like AWS/ASME) and manufacturer guidelines for preheat/PWHT.
5 What is S890Q high speed steel?
S890Q is a European standard (EN 10025-6) high-strength, fine-grain structural steel known for its very high yield strength (minimum 890 MPa) after being quenched and tempered, making it ideal for heavy-duty, load-bearing structures like construction equipment, bridges, and offshore rigs, offering excellent strength, toughness, and good weldability for its strength class, unlike traditional high-speed steels used for cutting tools.
6 What is the maximum allowable stress value for S890Q?
S890Q is a high-strength structural steel with a minimum yield strength of 890 MPa (129 ksi) and tensile strength typically between 940-1100 MPa, but the allowable stress depends on the specific design code (like Eurocode or AISC), safety factors, thickness, and application, usually found by dividing yield strength by a safety factor (e.g., around 500-600 MPa for general structural design), so always check the relevant design code for your project.
7 What are the typical application fields of S890Q?
S890Q is a high-strength, quenched and tempered structural steel used in applications demanding extreme loads, such as heavy machinery (mining, construction, lifting equipment), transportation, bridges and trestles, and the offshore industry (wind turbine supports, drilling rigs). Its high yield strength (890 MPa) and excellent weldability make it ideal for highly stressed components in sectors like engineering, automotive, and agriculture.
If you have project requirements for S890Q, we welcome your inquiry. GNEE maintains a large inventory of commonly used high strength steel grades for your selection.For detailed mechanical properties, chemical composition, and technical data, as well as free samples, please contact our factory immediately. We offer competitive prices, stable quality, and professional service. Email:info@gneesteels.com
