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EN 10025-2 S355J0 High-strength Low-alloy (HSLA) Steel Plate

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EN10025-2 S355J0 is a high-strength structural steel with well-balanced comprehensive properties, offering cost-effectiveness. It is widely used in various structural and engineering applications due to its excellent strength, good toughness, and welding performance. When selecting, it is necessary to determine whether a higher grade with improved low-temperature toughness (such as S355J2 or S355K2) is required based on the minimum ambient temperature the structure will be exposed to.

Standard :
EN 10025-2
Grade :
S355J0
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 10025-2 S355J0 is a high-strength low-alloy (HSLA) structural steel grade widely used in construction and engineering due to its good strength, weldability, and toughness. It is part of the S355 series, with the "J0" suffix indicating impact testing at 0°C (instead of -20°C or -30°C for other variants like S355J2 or S355K2).

Standard and Grade Designation

Standard: EN 10025-2

This is the European standard for "Hot rolled products of structural steels - Part 2: Technical delivery conditions for non-alloy structural steels."

Grade: S355J0

"S" = Structural steel

"355" = Minimum yield strength of 355 MPa (at ≤16mm thickness)

"J0" = Impact toughness requirement at 0°C (27J min, longitudinal Charpy V-notch test)

Material Type: Non-alloy steel (but may contain small amounts of alloying elements like Mn, Si, etc.)

Delivery Condition: Typically hot-rolled (as-rolled) or normalized

Key Features:

✔ High strength-to-weight ratio

✔ Good weldability and formability

✔ Cost-effective for structural applications

✔ Reliable impact resistance at low temperatures (0°C)

Chemical Composition

S355J0 is a non-alloy steel whose chemical composition is strictly controlled to ensure good weldability and mechanical properties.

Grade	S335J0
Element	C		Si	Mn	P	S	N	Cu
Content (max, %)	thickness ≤ 40 mm	thickness ＞40 mm
	0.20	0.22	0.55	1.60	0.030	0.030	0.012	0.55

Carbon Equivalent of S355J0 High-strength Low-alloy Steel Plate

Grade	Thickness (t) [mm]	CEV [max, %]
S355J0	t ≤ 40	0.40
	40 < t ≤ 63	0.42
	63 < t ≤ 80	0.44
	80 < t ≤ 100	0.45
	100 < t ≤ 150	0.46

* The carbon equivalent value varies depending on the thickness.For detailed information, please contact us for inquiries.

* Carbon equivalent (CEV) is calculated using the International Institute of Welding (IIW) formula:

CEV = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15

Mechanical Properties

Grade	Thickness (t) [mm]	Yield Strength (ReH) [min, MPa]	Tensile Strength (Rm) [MPa]	Elongation (A) [min, %]	Impact Energy (KV) [min]
S355J0	t ≤ 16	355	470 - 630	22	27J (at 0°C)
	16 < t ≤ 40	345	470 - 630	22	27J (at 0°C)
	40 < t ≤ 63	335	470 - 630	21	27J (at 0°C)
	63 < t ≤ 80	325	470 - 630	21	27J (at 0°C)
	80 < t ≤ 100	315	470 - 630	20	27J (at 0°C)

* The actual yield strength value decreases as the material thickness increases.

Applications

1. Building & Bridge Construction (beams, columns, frames)

2. Heavy Machinery & Equipment (cranes, forklifts, trailers)

3. General Fabrication (brackets, supports, platforms)

4. Shipbuilding & Offshore Structures (non-critical parts)

Other Information

Fabrication & Processing:

Cutting: Suitable for laser, plasma, flame, or shear cutting.

Welding: Compatible with SMAW, GMAW, FCAW, SAW (preheat if thickness >25mm).

Forming: Can be cold-formed; annealing may help for severe bends.

Heat treatment: Typically supplied in the "hot-rolled condition" (no additional heat treatment required). If increased hardness is needed, normalizing treatment (heating to 850-950°C followed by air cooling) can be performed, though this may slightly reduce toughness.

Precautions for Procurement and Inspection

Delivery Condition: Default is "as-rolled (AR)." If normalized (N) or controlled rolled (CR) condition is required, it must be specified in the order (controlled rolled steel generally offers better toughness).

Quality Certificate: Suppliers must provide a quality certificate compliant with EN 10204 standards, including:

1. Certificate: Includes test results for chemical composition and mechanical properties, suitable for most structural engineering applications.

2. Certificate: Requires third-party inspection agency involvement (e.g., SGS, BV) for witness testing, applicable to high-demand scenarios (e.g., bridges, pressure vessels).

Thickness Tolerance: The thickness tolerance grade (e.g., "normal tolerance" or "high precision tolerance" as per EN 10025-2) must be selected based on the application to avoid affecting structural load calculations.

Surface Quality: Default is "usual surface (U)." For applications with high aesthetic requirements (e.g., exposed steel structures), specify "improved surface (R)" to minimize surface defects (e.g., scratches, scale).

Comparison with Other Grades:

Grade	Yield Strength（≥MPa）	Impact Test Temperature	Differences in Applicable Scenarios
S355J0	355（≤16mm）	0℃	Medium strength, more commonly used for general structures
S420J0	420（≤16mm）	0℃	High strength for load-bearing structures with greater demands
S460J0	460（≤16mm）	0℃	Even higher strength, suitable for ultra-heavy-duty structures

Comparison with Other S355 Grades:

Grade	Impact Test Temp.	Key Difference
S355JR	+20°C	Lower strength, suitable for light structures with smaller loads.
S355J0	0°C	Good toughness at room temperature, suitable for structures in non-low temperature regions.
S355J2	-20°C	Better low-temperature toughness, suitable for structures in cold regions.
S355K2	-20°C	Higher guaranteed impact energy (≥40J at -20°C)

Summary

EN 10025-2 S355J0 is a high-strength structural steel plate with excellent toughness at ambient temperatures and good processability. It is widely used in industrial and construction applications globally. Key factors to consider during procurement include yield strength, impact toughness, and the compliance of quality certificates.

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.