S460Q is a quenched and tempered high-strength structural steel compliant with the European standard EN 10025-6, featuring excellent strength, toughness and processability, and is widely applied in engineering machinery, construction and infrastructure fields. The detailed introduction is as follows:
**Grade Definition and Domestic Equivalent Grades**
- **Grade meaning**: The letter "S" stands for structural steel, indicating its main application in load-bearing structural components; the number "460" means that when the thickness of the steel plate is not more than 50mm, its minimum yield strength can reach 460MPa; the letter "Q" represents the delivery state of quenching and tempering, which is the key process to ensure the steel's balanced strength and toughness.
- **Domestic equivalent**: It is roughly equivalent to China's Q460D high-strength structural steel, with close tensile properties and chemical composition. Some scenarios also consider it can correspond to Q460C, but there are slight differences in partial impact performance indicators, and performance verification is needed before interchangeable use.
**Chemical Composition**
The chemical composition of S460Q is strictly controlled to balance strength and processability. The maximum content of main elements is as follows: carbon (C) ≤ 0.22%, silicon (Si) ≤ 0.86%, manganese (Mn) ≤ 1.8%. Harmful impurity elements are strictly limited, with phosphorus (P) ≤ 0.03% and sulfur (S) ≤ 0.017%, to avoid reducing the steel's toughness and weldability. It can also contain alloy elements such as chromium (≤ 1.6%), molybdenum (≤ 0.74%) and nickel (≤ 2.1%) according to production needs. In addition, it is required to contain at least 0.010% of grain refining elements, and aluminum is the most commonly used one. When the total aluminum content is ≥ 0.013%, it can meet the requirements of soluble aluminum content, which helps refine the grain structure and improve the comprehensive mechanical properties of the steel.
**Core Mechanical Properties**
The mechanical properties of S460Q show a regular downward trend with the increase of steel plate thickness, but still maintain good performance. For steel plates with a thickness of 3 to 50mm, the minimum yield strength is 460MPa, the tensile strength ranges from 550 to 720MPa, and the minimum elongation is 17%. For steel plates with a thickness of 50 to 100mm, the minimum yield strength drops to 440MPa, the tensile strength remains in the range of 550 to 720MPa, and the minimum elongation is still 17%. For steel plates with a thickness of 100 to 150mm, the minimum yield strength is 400MPa, the tensile strength is 500 to 670MPa, and the minimum elongation is 17%. In terms of impact toughness, the Charpy V-notch impact test of S460Q is carried out at -20°C, and the minimum impact energy can reach 30J, which can meet the toughness requirements of general low-temperature working environments.
**Delivery Specifications and Processing Performance**
- **Delivery specifications**: The common thickness range of S460Q steel plates is 3mm to 350mm, the width is 1500mm to 4200mm, and the length is 3000mm to 18000mm. It supports a variety of value-added customization services, including Z-direction performance testing of Z15, Z25 and Z35 grades to prevent lamellar tearing of large structural parts during welding and use; it can also carry out ultrasonic flaw detection according to standards such as EN 10160 to ensure the internal quality of the steel. According to customer requirements, it can also be subjected to surface treatments such as shot blasting and painting to improve corrosion resistance.
- **Processing performance**: S460Q has good weldability and formability. When welding thick plates with a thickness of more than 30mm, proper preheating treatment can reduce welding stress and avoid cold cracks in the weld joint. Its quenched and tempered delivery state ensures good cutting and machining performance, and can be processed into various structural parts through cutting, bending, stamping and other processes without obvious performance degradation.
Application Scenarios
Relying on its high strength and good toughness, S460Q has a wide range of application scenarios. In the field of engineering machinery, it is used to manufacture core components such as crane booms, excavator arms, hydraulic supports and mining electric shovels. In the field of construction and infrastructure, it can be used to produce load-bearing components such as beams, columns and frames of large buildings, as well as main beam structures of bridges. In other fields, it is also applied to the production of power transmission towers, oil derricks, heavy-duty automobile chassis, and various shafts and connecting rods that bear large loads.
Which domestic steel grade is it roughly equivalent to?
It is approximately equivalent to the national standard grade Q460D. They have similar tensile properties and chemical compositions, and can also correspond to Q460C in some scenarios with slight differences in impact performance indicators.
What is the meaning of the S460Q grade and which standard does it comply with?
It is a quenched and tempered steel conforming to the European standard EN 10025-6. "S" stands for structural steel, "460" means the yield strength ≥ 460MPa for plates ≤ 50mm thick, and "Q" represents the quenched and tempered delivery condition.
What are the requirements for its low-temperature impact performance?
It needs to undergo an impact test at -20°C, with a minimum impact energy of ≥ 30J. This can meet the toughness requirements of general low-temperature environments and avoid brittle fracture of components.