S890QL is a structural steel grade with an even greater yield strength than S690QL. The material serves as a great option for procurers who wish to promote high strength in a cost effective way. Due to the characteristics of the steel, clients can use this material in numerous applications resulting in a leaner build whilst still maintaining great strength.
S890QL is a water quenched & tempered steel which complies with the EN10025:6:2004 specification.
Chemical Composition of S890QL
| % | |
|---|---|
| C | 0.20 |
| Si | 0.80 |
| Mn | 1.70 |
| P | 0.020 |
| S | 0.010 |
| N | 0.015 |
| B | 0.0050 |
| Cr | 1.50 |
| Cu | 0.50 |
| Mo | 0.70 |
| Nb | 0.06 |
| Ni | 2.0 |
| Ti | 0.05 |
| V | 0.12 |
| Zr | 0.15 |
Mechanical Properties of S890QL
| Designation | Mechanical Properties (ambient temperature) | |||||||
|---|---|---|---|---|---|---|---|---|
| Steel Name | Steel Number | Min. Yield Strength ReH MPa | Tensile Strength Rm MPa | Min. & elongation after fracture | ||||
| Nominal thickness (mm) | Nominal thickness (mm) | |||||||
| >3 <50 | >50 <100 | >100 <150 | >3 <50 | >50 <100 | >100 <150 | |||
| S890QL | 1.8983 | 890 | 830 | -- | 940/1100 | 880/1100 | -- | 11 |
V Notch Impact Testing
| Grade | Sample Orientation | @ 0 Deg C | @ -20 Deg C | @ -40 Deg C | @ -60 Deg C |
|---|---|---|---|---|---|
| S890QL | Longitudinal | 50J | 40J | 30J | |
| Transverse | 35J | 30J | 27J |
Key Processing Aspects:
Quenching & Tempering (Q+T): This is the base heat treatment, imparting high strength and toughness; S890QL is delivered in this state.
Cutting: Can be cut to size/shape (laser, plasma, waterjet).
Bending (Forming): Superior bendability, but follow standards (CEN/TR 10347) for optimal results, especially considering thickness.
Machining: Easy to machine, but requires appropriate tools and settings.
Welding:
Preheating: Often required; use lower heat input to minimize preheating.
Heat Input: Control heat input to maintain mechanical properties; high input can increase hardness.
Post-Weld Heat Treatment (PWHT): Generally not needed, but if required for design/code, perform at 530-560°C.
Standards: Follow EN 1011 recommendations.
Surface Finish: Can be supplied descaled or primed upon agreement.
Applications
Lifting Equipment: It is widely adopted in critical load-bearing components of lifting equipment, including mobile cranes, loader cranes, and aerial work platforms. These devices require materials that can withstand extreme tensile forces and dynamic loads during operation. HSLA structural steel's high yield and tensile strength ensure stable lifting performance, while its lightweight property reduces the overall weight of the equipment, expanding the effective operating radius and improving operational flexibility without compromising safety.
Heavy Machinery: This steel is an ideal choice for earth-moving equipment (such as excavators, bulldozers) and mining machinery. In harsh working environments like construction sites and mines, components are frequently subjected to strong impact, friction, and pressure. HSLA steel's excellent toughness and wear resistance extend the service life of core parts like buckets, frames, and track shoes, reducing maintenance frequency and downtime for machinery.
Transportation: It plays a key role in the transportation sector, applied to heavy-duty trailers, semi-trailers, and large commercial vehicles. For long-distance and heavy-load transportation, reducing vehicle weight is crucial for improving fuel efficiency and load capacity. HSLA steel enables thinner but stronger structural designs, enhancing the load-bearing capacity of trailers while lowering fuel consumption, thus boosting the economic efficiency of transportation operations.
Construction: In construction engineering, it is used in bridge load-bearing structures, high-strength steelwork for large factories, and special containers (such as pressure vessels and transport containers). Bridges and high-rise steel structures demand materials with high stability and durability to resist natural factors and long-term loads. HSLA steel meets these requirements, allowing for more compact structural designs and saving construction space and material costs.
Benefits
High Strength-to-Weight Ratio: This is one of the most prominent advantages of HSLA structural steel. Compared with ordinary carbon steel, it achieves higher strength with a lighter weight, enabling leaner structural designs. This not only reduces the amount of raw materials used but also lowers subsequent fabrication costs, including cutting, welding, and transportation, bringing significant economic benefits to enterprises.
Cost-Effective: It achieves efficient strength enhancement through precise alloy composition control and heat treatment processes, without relying on expensive alloy elements. Compared with high-strength special steels, HSLA steel has lower procurement and processing costs, while maintaining excellent mechanical properties, offering a high cost-performance ratio for large-scale engineering and equipment manufacturing.
Versatile: Despite its high strength, HSLA steel retains good processability. It is easy to machine, bend, and weld, adapting to various complex structural processing needs. No special equipment or cumbersome processes are required during production, enabling seamless integration into existing manufacturing lines and expanding its application scope across multiple industries.
Request a professional quotation for S890QL from GNEE Steel.
Is S890QL weldable?
Yes, S890QL has good weldability. Proper preheating and post-weld heat treatment are recommended to avoid cold cracking and ensure joint strength.
What is the typical application of S890QL?
It is commonly used in crane booms, excavator buckets, bridge components, offshore structures, and other heavy-load-bearing equipment requiring high strength.
What preheating temperature is needed for welding S890QL?
The preheating temperature is usually 80-150℃, depending on plate thickness. Thicker plates require higher preheating to prevent cracking.
Does S890QL require post-weld heat treatment?
It is recommended for thick sections or high-stress joints. Post-weld tempering relieves residual stress and improves the toughness of the weld zone.
What is the density of S890QL?
The density of S890QL is approximately 7.85 g/cm³, the same as conventional carbon structural steels, facilitating weight calculation in design.
What is the delivery condition of S890QL?
It is delivered in quenched and tempered (Q&T) condition, ensuring stable mechanical properties and consistent performance across the entire batch.
How to test the mechanical properties of S890QL?
Tests include tensile test, impact test, hardness test, and bending test, conducted in accordance with EN 10025-6 to verify compliance with standards.
Can S890QL be used in crane manufacturing?
Absolutely, it is a preferred material for crane booms, jibs, and frames, as its high strength reduces weight while ensuring load-bearing capacity.
What is the hardness range of S890QL?
The typical Brinell hardness of S890QL is 260-340 HBW, which balances strength and machinability for various engineering applications.
Can S890QL be heat treated?
S890QL is already quenched and tempered. Additional heat treatment should be controlled carefully to maintain its mechanical properties and avoid performance degradation.