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EN 10025-2 S235J0 High-strength Low-alloy (HSLA) Steel Plate

Q: 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.

Q: 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.

Q: 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.

EN 10025-2 S235J0 High-strength Low-alloy (HSLA) Steel Plate

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S235J0 is a cost-effective and widely used non-alloy structural steel, whose properties meet the requirements of general structural engineering. It is particularly suitable for load-bearing structures in environments around 0°C.

Standard :
EN 10025-2
Grade :
S235J0
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 S235J0 is a High-strength Low-alloy (HSLA) structural steel plate standardized under the European EN 10025-2 specification. It is designed for improved mechanical properties and weldability compared to standard carbon steels.

Steel Type: High-Strength Low-Alloy (HSLA) – Contains small alloying additions (e.g., Nb, V, Ti) for better strength and toughness.

Grade	S235J0
Standard	EN 10025-2 (Hot rolled products of structural steels - Part 2 : Technical delivery conditions for non-alloy structural steels)
Delivery Conditions	As Rolled (AR), Normalized (N) or Thermomechanical Control Process (TMCP)
Approval By Third Party	ABS, DNV, GL, CCS, LR , RINA, KR, TUV, CE
Weldability	Good weldability, can be welded without special preheating, and suitable for various welding methods.
Machinability	Good cold forming performance, easy to cut, shape, and bend.
Surface	The surface may have mill scale. Additional treatments such as shot blasting, sandblasting, painting, and galvanizing can be performed upon request.
Quality Control	Provide the material certificate. If required, Charpy V-notch impact test, and Z-direction property test (Grades Z15/Z25/Z35) can be added.

Standard and Grade Designation

Standard: EN 10025-2 (Hot-rolled structural steel products)

Material Grade: S235J0

"S" = Structural steel

"235" = Minimum yield strength (235 MPa) at ≤16mm thickness

"J0" = Impact toughness requirement at 0°C (minimum 27 Joules in Charpy V-notch test)

Key Features:

✔ Good weldability: Low carbon equivalent, can be welded without special preheating and is suitable for various welding methods.

✔ Excellent plasticity and machinability: Easy to cut, shape, and bend.

✔ Low temperature toughness: Maintains good toughness even at 0°C.

✔ Balanced comprehensive mechanical properties: Moderate strength suitable for general structural applications.

✔ Cost-effective: Low cost and widely available.

Chemical Composition

Grade	S235J0
Element	C	Si	Mn	P	S	N	Cu
Content (max, %)	0.17	-	1.4	0.030	0.030	0.012	0.55

Carbon Equivalent of S235J0 High-strength Low-alloy Steel Plate

Grade	Thickness (t) [mm]	CEV [max, %]
S235J0	t ≤ 30	0.35
	30 < t ≤ 40	0.35
	40 < t ≤ 150	0.38
	150 < t ≤ 250	0.40
	250 < t ≤ 400	0.40

* 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 (KV2) [min]
S235J0	t ≤ 16	235	360 - 510	26	27J (at 0°C)
	16 < t ≤ 40	225	360 - 510	26	27J (at 0°C)
	40 < t ≤ 63	215	360 - 510	25	27J (at 0°C)
	63 < t ≤ 80	215	360 - 510	24	27J (at 0°C)
	80 < t ≤ 100	215	360 - 510	24	27J (at 0°C)
	100 < t ≤ 150	195	350 - 550	22	27J (at 0°C)
	150 < t ≤ 200	185	340 - 490	21	27J (at 0°C)
	200 < t ≤ 250	175	340 - 490	21	27J (at 0°C)
	250 < t ≤ 400	165	330 - 480	21	27J (at 0°C)

* The yield strength, tensile strength, and elongation of S235J0 high strength structural steel plate slightly decrease with the increase in thickness.

Applications

S235J0 is widely used due to its moderate strength, good plasticity and toughness (especially at 0°C), and low cost. Its applications include:

1. Building structures: Load-bearing components such as factory buildings, warehouses, and frame structures.

2. Bridges and municipal engineering: Components like bridge supports and guardrails.

3. Mechanical manufacturing: Parts that do not require high strength, such as equipment frames, bases, and casings.

4. Steel structure fabrication: Welded or riveted structural components (this grade has good weldability and typically requires no preheating or only minimal preheating).

Other Information

International Standard Equivalent Materials:

Grade	Standard	Yield Strength (ReH) [min, MPa]	Tensile Strength (Rm) [MPa]	Elongation (A) [min, %]	Impact Energy (KV2) [min]
S235J0	EN 10025-2 (European)	235	360 - 510	26	27J (at 0°C)
Q235C	GB/T 700 (China)	235	370 - 500	26	27J (at 0°C)
SS400	JIS G3101-2015 (Japan)	245	400 - 510	21	-
A36	ASTM A36/A36M (USA)	250	400 - 550	23	-

* Since the requirements for chemical composition, mechanical properties, and corrosion resistance mechanisms vary slightly across different standards, "equivalence" typically refers to similarities in intended use and performance rather than exact identity.

Comparison with Similar Grades:

Grade	Yield Strength (MPa)	Impact Test Temp.	Impact Toughness (KV)	Differences In Applicable Scenarios
S235JR	≥ 235	+20℃	≥ 27 J	Lower impact toughness. Suitable for normal temperature environment
S235J0	≥ 235	0℃	≥ 27 J	Intermediate toughness. Suitable for slightly low-temperature environments (such as mild winter areas)
S235J2	≥ 235	-20℃	≥ 27 J	Better low-temperature toughness. Suitable for cold regions with high low-temperature toughness requirements

Conclusion:

EN 10025-2 S235J0 is a cost-effective HSLA steel with good strength, weldability, and low-temperature toughness, making it suitable for structural applications where moderate strength and impact resistance are required.

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.