Inquiry Now

EN 10025-4 S460M High-strength Low-alloy (HSLA) Steel Plate

info@yx-steel.com 8615837212056 Get a Quote

EN 10025-4 S460M refers to a specific grade of high-strength thermomechanically rolled (TMCP) structural steel plate defined in the European standard EN 10025.

Standard :
EN 10025-4
Grade :
S460M
Thickness :
0.8-30.0 mm
Width :
800-2500 mm
Length :
3000-12000 mm

Special thickness, width, and length can be negotiated separately.
We also provide customized processing services.If you have any questions, please contact us.

Overview

EN 10025-4 S460M is a premium-grade high-strength structural steel plate designed for demanding engineering applications requiring a balance of strength, weldability, and toughness. Here’s a comprehensive overview based on the latest technical standards and industry practices:

Standard and Grade Designation

Standard: EN 10025-4:2004 (current as of 2025), which specifies requirements for thermomechanically rolled (TMCP) weldable fine-grain structural steels .

Grade Designation:

S: Structural steel.

460: Minimum yield strength of 460 MPa for thickness ≤16 mm.

M: Thermomechanical rolling (TMCP) delivery condition, ensuring optimal strength-toughness balance without post-rolling heat treatment.

Mechanical Properties

Grade	Thickness	Yield Strength	Tensile Strength	Elongation
S460M	≤16 mm	≥460 MPa	540–720 MPa	≥17%
	16–40 mm	≥440 MPa	530–710 MPa	≥17%
	40–63 mm	≥430 MPa	510–690 MPa	≥17%
	63–80 mm	≥410 MPa	500–680 MPa	≥17%
	80–100 mm	≥400 MPa	490–660 MPa	≥17%
	100–120 mm	≥385 MPa	490–660 MPa	≥17%

Impact Resistance

Test Temperature: -20°C (standard) with optional -50°C for S460ML variant .

Impact Energy (KV):≥40 J at -20°C (longitudinal specimens) .

Higher values at warmer temperatures: ≥55 J at +20°C, ≥47 J at 0°C .

Note on Impact Toughness: The 'M' grade mandates Charpy V-notch impact testing at -20°C. This makes it suitable for structures subject to dynamic loading and cold climates. There are other grades with different impact test temperatures (ML: -50°C, ML1: -60°C for even more demanding applications).

Applications

1. Heavy Machinery: Cranes, excavators, and mining equipment .

2. Infrastructure: Bridges, flood gates, and high-rise buildings .

3. Offshore & Marine: Platforms, storage tanks, and ship components .

4. Energy Sector: Wind turbine towers and pressure vessels .

Other Information

Manufacturing & Processing

Thermomechanical Control Process (TMCP)

Combines controlled rolling and accelerated cooling to achieve fine-grained microstructure, eliminating the need for post-rolling heat treatment .

Limitations: Not suitable for hot forming due to TMCP-induced microstructure stability .

Welding

Recommended Methods: Arc welding (MMA, MIG, TIG), submerged arc welding (SAW) .

Preheating: Required for thick sections (>50 mm) or high 拘束度 joints; typical preheat temperature: 80–150°C .

Electrodes: Use low-hydrogen electrodes (e.g., AWS E7018) matched to strength grade.

Surface Treatments

Corrosion Resistance: Improved via hot-dip galvanizing, painting, or shot blasting .

NACE MR0175 Compliance: Available for sour service environments (e.g., oil/gas pipelines).

Safety Notes:

Cold Cracking Risk: Mitigated by controlling hydrogen levels in welding and proper preheating .

Fracture Toughness: Critical in low-temperature applications; verify impact test results at service temperature .

Comparison with Similar Grades

It's easy to confuse this with other S460 grades. The suffix letter is critical.

Grade	Delivery Condition	Key Difference
S460M	Thermomechanical Rolled	Standard impact test at -20°C.
S460ML	Thermomechanical Rolled	Higher impact toughness, tested at -50°C.
S460ML1	Thermomechanical Rolled	Even higher impact toughness, tested at -60°C.
S460N	Normalized or Normalized Rolled	Heat-treated, generally has lower strength for thicker sections compared to TMCP steel.
S460NL	Normalized or Normalized Rolled	Normalized with higher impact toughness (-50°C).

Summary

EN 10025-4 S460M is a high-strength, thermomechanically rolled, fine-grain structural steel with a minimum yield strength of 460 MPa and guaranteed impact toughness at -20°C. Its properties make it an excellent choice for demanding welded structures where reducing weight and material usage is a priority.

FAQ

Q1:

What are the weldability characteristics of high-strength low-alloy steel plates?

High-strength low-alloy steel plates offer excellent weldability. As their carbon content is typically low (below 0.2%), they present a lower risk of cracking during welding compared to standard high-strength steel plates and generally do not require complex preheating treatments.

Q2:

Why are high-strength low-alloy steels the preferred choice in construction and automotive manufacturing?

The key advantage of high-strength low-alloy steels is weight reduction. As they offer greater strength, thinner sheets can be used to withstand the same loads, thereby reducing the overall weight of the structure; in the automotive sector, this leads to improved fuel efficiency.

Q3:

What is high-strength low-alloy steel (HSLA)?

High-strength low-alloy steel (HSLA) is a type of steel in which small amounts of alloying elements (such as niobium, vanadium, titanium or copper) are added to enhance its mechanical properties. Compared to traditional carbon steel, it offers higher yield strength and better corrosion resistance whilst maintaining good weldability and formability.