What temperature is S890Q ?

What temperature is S890Q ?

S890Q is a high-strength quenched and tempered steel with a minimum yield strength of 890 MPa, used in high-stress applications, and specified to perform with a minimum impact energy at temperatures down to -20°C, though it's crucial to avoid exceeding its tempering range (around 530-580°C) during processing and often requires preheating for welding or cutting thick sections.

S890Q is a European standard (EN 10025-6) high-strength, fine-grain structural steel plate (also known as high strength low alloy steel). It is recognized for its very high yield strength of 890 MPa and high tensile strength. This grade is specifically designed for hot-rolled structural steels delivered in the quenched and tempered condition, making it ideal for heavy-duty applications like construction machinery, cranes, and bridges where extreme loads are common.

The properties of S890Q are achieved through a two-stage heat treatment:

Quenching: A process consisting of cooling the ferrous steel plate more rapidly than in still air.

Tempering: A heat treatment applied generally after quench hardening to bring the mechanical properties-such as good weldability, cold formability, and specified impact toughness (down to -20°C)-to the required level. (Note: Variations like S890QL/QL1 offer toughness at even lower temperatures.)

The adoption of S890Q has revolutionized the design of heavy-duty machinery, particularly in the lifting and transport sectors. Its most prominent application is in the construction of mobile crane booms, where the material's high strength allows for longer reach and higher lifting capacities while keeping the crane's dead weight within road-legal limits. Without S890Q, modern telescopic cranes would be significantly heavier and less maneuverable. Similarly, in the manufacturing of heavy-duty trailers and specialized transport vehicles, S890Q provides the necessary skeletal strength to carry massive payloads over long distances across challenging terrains.

Key characteristics

Type: High-Yield Strength Quenched & Tempered (HYSQ&T) Structural Steel.

Strength: Minimum yield strength of 890 MPa (N/mm²).

Standard: EN 10025-6.

Processing: Delivered in a Quenched and Tempered (Q) condition.

Impact Toughness: Tested for impact energy at temperatures down to -20°C (with L/L1 variants for -50°C/-60°C).

Applications

Heavy machinery (mining, construction)

Cranes and lifting equipment

Offshore structures (windmills, drilling rigs)

Bridges and heavily loaded structural parts

Processing considerations

Welding: Readily weldable but may require preheating (100-200°C) for thicknesses over 30mm or at low temperatures to prevent cold cracking.

Cutting: Can be plasma, laser, or flame cut, with laser generally offering the best fatigue performance on cut edges.

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.

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.

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.

S890Q quenched and tempered steel plate mechanical properties

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 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.

3 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.

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 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.

6 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.

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.

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