What is S960Q high speed steel?

What is S960Q high speed steel?

S960Q is not a High-Speed Steel (HSS) but rather an Ultra-High Strength Structural Steel (UHS-S), following the EN 10025-6 standard, known for exceptional strength (minimum 960 MPa yield), toughness, and good weldability, used in heavy machinery, construction, and transport for lighter, stronger designs. The 'S' denotes structural steel, '960' its yield strength, and 'Q' signifies it's delivered in a quenched and tempered condition, allowing it to handle extreme loads and impacts, unlike HSS which is for cutting tools.

S960Q High-Strength Structural Steel

S960Q is a super high-strength structural steel designated under European standard EN 10025-6. It is known for its exceptional strength, featuring a minimum yield strength of 960 MPa. This high strength allows for lighter, more efficient designs in demanding applications such as construction, heavy machinery, and transport.

The material is produced in the quenched and tempered ("Q") condition, which gives it excellent strength and abrasion resistance. Specifically, S960QL is a water quenched and tempered steel that complies with the EN10025:6:2004 specification. The chemical composition meets European standards, made of high-quality iron and carbon along with alloying elements such as manganese, silicon, and phosphorus, which improve the toughness and mechanical integrity of the plate. Despite its high strength, S960Q maintains good bending and welding capabilities.

S960Q steel plate offers superior mechanical properties, including high tensile strength, impact toughness, and fatigue resistance. It can withstand high loads, vibrations, and corrosion, making it suitable for various harsh environments. Consequently, it is used extensively in the heavy transport, lifting, and mining industries, where huge payloads and the risk of material deterioration through excessive abrasion are commonplace.

Key Characteristics:

'S': Indicates it's a Structural Steel.

'960': Denotes a minimum yield strength of 960 MPa (megapascals) for thicknesses up to 50mm.

'Q': Means the steel is supplied in a Quenched and Tempered condition, providing high strength and toughness.

High Strength-to-Weight: Allows for reduced material use, creating lighter structures with increased payload capacity.

Excellent Toughness: Maintains good impact resistance even at low temperatures (e.g., 30J at -20°C).

Good Weldability: Can be fabricated using standard arc welding techniques, though specific procedures are recommended.

Applications:

Bridges and heavy infrastructure.

Lifting equipment and cranes.

Earthmoving machinery.

Transport (e.g., heavy-duty containers, vehicle chassis).

Variants:

S960QL: Similar, but with lower minimum impact energy requirements at even lower temperatures.

What precautions should be taken when welding S960Q?

When welding S960Q (a high-strength steel), key precautions involve controlling heat input to prevent loss of mechanical properties, ensuring proper pre- and post-weld heat treatment, selecting compatible filler materials, meticulously controlling cooling rates (t8/5 < 10-15s for thicker plates), and maintaining general welding safety (ventilation, PPE, fire watch).

What is S960Q equivalent to?

S960Q is a European (EN 10025-6) high-strength structural steel (minimum yield strength 960 MPa), equivalent to German TStE960V, French E960T/S960T, and branded grades like Dillinger's DILLIMAX 965 B/TStE960V, Strenx 960, or Alform 960 x-treme, etc., while S960QL/QL1 are tougher versions. It's used where high strength-to-weight is needed, like cranes, heavy machinery, and bridges, with ASTM equivalents often cited as high-strength grades like HPS 100W or ASTM A709 Gr. 100.

What is the composition of S960Q?

S960Q is a high-strength, low-alloy structural steel (EN 10025-6 standard) known for its excellent strength and toughness, quenched and tempered for delivery, with key elements including controlled Carbon (max 0.2%), Silicon (max 0.8%), Manganese (max 1.7%), and minimal Phosphorus (max 0.025%) and Sulfur (max 0.015%), plus alloying elements like Chromium, Molybdenum, Vanadium, and Niobium for enhanced properties, designed for heavy-duty, lightweight load-bearing structures.

Chemical composition % of steel S960Q (1.8941): EN 10025-6-2004

Mechanical properties of steel S960Q (1.8941)

Notch Impact Energy

1 What are the typical application fields of S960Q?

S960Q (a high-strength quenched and tempered steel) is primarily used in applications demanding extreme strength, toughness, and durability, such as heavy machinery (cranes, excavators, mining equipment), major construction (high-rise buildings, bridges, offshore platforms), and transportation (truck chassis, trailers, railway components) for weight reduction and improved performance, as well as in specialized industrial structures like those in the chemical, oil & gas, and nuclear sectors.

2 What is the P number of S960Q?

S960Q is a high-strength structural steel, and while it doesn't have a standard P-Number like some ASME materials, its chemical composition (low carbon, low phosphorus) places it in a category where its welding characteristics are well-defined, often grouped with similar high-strength low-alloy (HSLA) steels for procedure qualification, potentially under a broad P-Number group (like P1 or P15) depending on the specific code interpretation (ASME IX), but generally requiring specific consideration for its high strength, often in Group 1 or similar for welding.

3 Is S960Q carbon steel?

Yes, S960Q is a type of high-strength low-alloy (HSLA) steel, often described as a carbon and low-alloy steel, that meets the European standard EN 10025-6, known for its high yield strength (960 MPa) and excellent mechanical properties, making it ideal for demanding structural applications. While it contains carbon (like all steels), its performance comes from controlled alloying and a quenched & tempered (Q) heat treatment, not just high carbon content like traditional carbon steels.

4 What is S960Q high speed steel?

S960Q is not a High-Speed Steel (HSS) but rather an ultra-high-strength structural steel (UHSS) under the EN 10025-6 standard, known for its exceptional strength (minimum yield strength of 960 MPa) and toughness, achieved through quenching and tempering (the 'Q'), making it ideal for heavy-duty, load-bearing applications like cranes, bridges, and heavy machinery where weight reduction and durability are crucial.

5 What temperature is S960Q?

S960Q is a high-strength steel designed for performance in specific temperature ranges, notably maintaining impact toughness down to at least -20°C (or even -40°C for the 'L' variant), with a quenching and tempering (Q) process giving it strength, but it's processed and used within certain temperature limits, generally not exceeding 300°C for sustained loads, and requires preheating for welding at lower ambient temperatures.

6 What welding rod for S960Q ?

For welding S960Q, an ultra-high-strength fine-grained steel, you need a matching high-strength filler metal, typically an ER 120S-1 (for TIG) or an equivalent low-alloy wire with NiCrMo additions, designed to match its yield strength of up to 960 MPa and provide excellent low-temperature impact toughness and ductility, with proper heat input control being critical.

7 What is the hardness of S960Q steel?

S960Q steel, a high-strength quenched and tempered structural steel, typically has a hardness around 340 HV10 (Vickers) in its base metal condition, but hardness can significantly increase in the heat-affected zone (HAZ) after welding, reaching over 400 HV10, with some reports showing values up to 441 HV10 due to its bainitic-martensitic microstructure.

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