What is the P number of S890Q ？

What is the P number of S890Q ?

The P (Phosphorus) content for S890Q steel is typically a maximum of 0.025%, though some specifications allow for a range of 0.020–0.025%, as phosphorus is controlled in this high-strength steel to maintain toughness, with lower P being desirable.

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.

The primary appeal of S890Q lies in its exceptional strength-to-weight ratio. By utilizing S890Q, engineers can design structures that are significantly lighter than those made with conventional structural steel without sacrificing load-bearing capacity. This weight reduction is a game-changer for industries such as transportation and mobile lifting, where reducing the deadweight of a vehicle or crane boom directly translates into higher payloads, lower fuel consumption, and increased operational efficiency. It is the material of choice for telescopic booms, heavy-duty trailers, and agricultural machinery.

In the heavy equipment and mining sectors, S890Q is frequently employed for components that must withstand extreme mechanical stresses. It is commonly found in the chassis of dump trucks, the frames of large excavators, and the structural supports of offshore platforms. Because S890Q is tested for impact toughness at temperatures as low as -20°C (with its variants QL and QL1 reaching -40°C and -60°C respectively), it is highly reliable in harsh environments. This ensures that the steel does not become brittle or fail catastrophically when subjected to sudden loads in freezing conditions.

Furthermore, the longevity and durability of S890Q contribute to long-term cost savings. While the initial material cost may be higher than lower-grade steels, the reduction in total material volume needed and the extended service life of the finished product often lead to a lower total cost of ownership. Its resistance to fatigue and deformation ensures that heavy-duty machinery can operate under grueling schedules with minimal downtime for repairs. Whether in the construction of skyscraper frameworks or massive bridge segments, S890Q provides a level of structural security that is indispensable in modern engineering.

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 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.

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.

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.

Chemical composition % of steel S890Q (1.8940): EN 10025-6-2004

Mechanical properties of steel S890Q (1.8940)

1 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.

2 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.

3 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.

4 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.

5 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

6 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.

7 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.

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