S355J2G3 and S355J2+N (EN 1.0577) are two common structural steel materials that play an important role in the engineering field. S355J2G3 is a non alloy structural steel with good weldability and mechanical properties, commonly used in the manufacture of components, mechanical parts, and equipment. In contrast, S355J2+N (EN 1.0577) is a product obtained by normalizing S355J2 steel, which has higher strength and toughness.
The characteristics of S355J2G3 include high tensile strength, ductility, and impact value, and are widely used in construction and structural engineering. S355J2+N is more suitable for applications that require higher strength and hardness, such as heavy machinery and lifting equipment. These steels have good processability and corrosion resistance, which can meet various industrial needs.
Overall, the selection of appropriate materials depends on specific engineering requirements and environmental conditions. Both S355J2G3 and S355J2+N are reliable and versatile materials, providing engineers and manufacturers with a wide range of choices to meet the needs of different projects.
Overview of S355J2G3 and S355J2+N
What is S355J2+N High Tensile Steel Plates ?
S355J2+N High Tensile Steel Plate
The name of the given high-strength structural steel conforming to the European Standard en10025 for Grade S355. The "S" stands for structural steel with a minimum yield strength of 355 Megapascals (MPa). The "355" comes from the steel designation, which assumes the feature of structural steel-structural with a minimum yield stress of 355 Megapascals (MPa). The "+N" in S355J2+N designates its normalizing status.
Normalizing is one heat treatment process in which the micro-structure structure can become finer, and hence the mechanical properties of steel are improved in terms of strength and toughness.
With the majority of high structural steel plate uses, the application of high structural steel plates effectively reduces the use of welded and bolted sections, minimizes the cost of available steelwork related to welded and bolted parts, and minimizes on-site labour involved in cutting and welding.
The high available strength, along with good combinations of strength, excellent weldability, and high resistance, are the good ingredients that make the S355J2+N grade ideal for highly critical structural applications in some of the toughest industrial environments.
What is S355J2G3 Structural Steel Plate?
EN 10025-2:2004 defines S355J2G3 as a non-alloy structural steel, and the "S" in the name defines it as structural steel. "355" is the required minimum yield strength in megapascal (MPa) of the steel at a thickness less than 16 millimeters.
In a bit of developing background by name, "J2" means the Design temperature -20C and the average impact properties can be fully met by test pieces. This condition makes it ideal even for low-temperature applications.
It is S355J2, it is then a low alloy, high strength, normalized non-alloy structural steel with good machinability that complies with all mechanical and chemical properties set by EN 10025 in the making of structural members, beams, columns, and other shapes pertinent to the constructions and engineering industries.
Chemical Composition Comparison
Chemical Properties of S355J2+N High Tensile Structural Steel Plates
The chemical properties of S355J2+N High Tensile Structural Steel Plates do tend to arrive with certain alterations after being long accustomed to the application of these components. The quality parameters that have been pre-defined in proportion to the required proof strength tensile.
- Carbon (C): Carbon gives strength to the material. The carbon content for S355J2+N shall be no more than 0.20 wt% in the material.
- Silicon (Si): An alloying element added to enhance the strength of steel when removing its oxides is taking place at the manufacturing stage of steel. Generally, in S355J2+N, the level of silicon is restricted up to a maximum of 0.55%.
- Manganese (Mn)-Manganese is an element that improves the steel surface after quenching; it should be present in steel in large quantities. In S355J2, such is the case with S355J2+N, while the manganese content increases from 1.60% to 1.80%.
- Phosphorus (P): Phosphorus is allowed to go down to ensure full weldability. Normally, the maximum allowed phosphorus content on an S355J2+N shall be around 0.035% on average.
- Sulfur (S): Even the content of sulfur is regulated to be on the lower side for the enhanced machinability of the steel. Typically, the content of sulfur is restricted to 0.035% in S355J2+N.
| Carbon (C) | Silicon (Si) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) |
|---|---|---|---|---|
| 0.22% | 0.55% to 0.65% | 1.60%-1.80% | 0.035% | Max 0.035% |
Chemical Properties of S355J2G3 Structural Steel
The chemical composition of S355J2G3 structural steel is specified by the EN 10025 standard. The main elements and their typical ranges are as follows:
- Carbon (C): The maximum carbon content is typically 0.22%.
- Silicon (Si): The maximum silicon content is generally 0.55%.
- Manganese (Mn): The manganese content ranges between 1.60% and 1.80%.
- Phosphorus (P): The maximum phosphorus content is limited to 0.035%.
- Sulfur (S): The maximum sulfur content is restricted to 0.035%.
- Nitrogen (N): The maximum nitrogen content is usually 0.012%.
- Copper (Cu): The maximum copper content is typically 0.55%.
- Niobium (Nb): The maximum niobium content is generally 0.06%.
- Vanadium (V): The maximum vanadium content is typically 0.12%.
| Carbon (C) | Silicon (Si) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) |
|---|---|---|---|---|
| 0.22% | Up to 0.55% | 1.60%-1.80% | Max 0.035% | Max 0.035% |
Mechanical Properties Comparison
Mechanical Properties of S355J2+N High Tensile Structural Steel Plates
| Yield Strength | Tensile Strength | Elongation | Hardness | Thickness |
|---|---|---|---|---|
| Around 355 MPa | 490-630 MPa | 20-25% | 450 to 500 HBW | 1mm to 300mm |
Mechanical Properties of S355J2G3 Structural Steel
| Yield Strength | Tensile Strength | Elongation | Hardness | Thickness |
|---|---|---|---|---|
| 355-550 MPa | 470-620 MPa | around 10-15% | 160 to 190 HBW | 1mm to 300mm |
Difference Between S355J2 N and S355J2G3 – Standard Evolution
Standard Comparison
| Grade | Standard Version | Status |
|---|---|---|
| S355J2G3 | EN 10025:1990 | Obsolete |
| S355J2+N | EN 10025-2:2004+ | Current |
The EN standard was updated to simplify naming and unify delivery conditions.
Result:
- S355J2G3 → replaced by S355J2+N
- Modern projects specify S355J2+N
Difference Between S355J2 N and S355J2G3 – Delivery Condition
Heat Treatment Comparison
S355J2+N
- Delivered in normalized or normalized rolled condition
- Clearly specified in modern standards
S355J2G3
- Also normalized
- Less clearly defined in older documentation
Practical Difference:
- S355J2+N provides more standardized and reliable specification control.
Difference Between S355J2 N and S355J2G3 – Applications
Common Applications
Both grades are widely used in:
- Structural construction
- Bridges and buildings
- Machinery manufacturing
- Offshore and engineering structures
Application Insight
- Since properties are equivalent, S355J2+N fully replaces S355J2G3 in modern applications.
Difference Between S355J2 N and S355J2G3 – Advantages Comparison
S355J2+N Advantages
- Current international standard
- Clear specification and certification
- Widely accepted in global projects
S355J2G3 Advantages
- Legacy compatibility with older designs
- Still referenced in some existing projects
Difference Between S355J2 N and S355J2G3 – Parameter Table
| Parameter | S355J2+N | S355J2G3 |
|---|---|---|
| Standard | EN 10025-2 (current) | EN 10025:1990 (old) |
| Delivery Condition | Normalized (+N) | Normalized |
| Chemical Composition | Same | Same |
| Mechanical Properties | Equivalent | Equivalent |
| Market Usage | Widely used | Rare / replaced |
Popular S355 specifications
| Grade | symbol | |
S355 |
JR | Charpy impact tests at room temperature 20°C |
| J0 | Charpy impact tests at 0°C | |
| J2 | Charpy impact tests at -20°C | |
S355J2 |
N | Supply condition normalised |
| G3 | Supply condition normalised | |
Difference Between S355J2 N and S355J2G3 – Which One Should You Choose?
Selection Recommendation
Choose S355J2+N for:
- New projects
- International standards compliance
- Better documentation and certification
Choose S355J2G3 only if:
- Required by legacy project specifications
- Matching older engineering drawings
👉 Final Advice:
For most buyers, S355J2+N is the direct and recommended replacement.
To learn more about S355J2+N, we invite you to read A Basic Guide on EN 10025 S355J2+N Plates.
Difference Between S355J2 N and S355J2G3 – Conclusion
In summary, the difference between S355J2 N and S355J2G3 is mainly related to standard evolution rather than performance. Both grades share the same chemical composition, mechanical properties, and normalized condition. However, S355J2G3 is an outdated designation, while S355J2+N is the modern, globally accepted equivalent.
If you are sourcing structural steel for your project, GNEE can provide certified S355J2+N plates with full traceability, competitive pricing, and fast delivery. Contact us today for expert support and a quick quotation-ensure your project uses the right steel with confidence!
What is the difference between S355J2 and S355J2G3?
S355J2G3 is a non alloy structural steel with good weldability and mechanical properties, commonly used in the manufacture of components, mechanical parts, and equipment. In contrast, S355J2+N (EN 1.0577) is a product obtained by normalizing S355J2 steel, which has higher strength and toughness.
What does the G3 mean in S355J2G3?
S355J2G3 is an older designation for a non-alloy structural steel grade from the EN 10025 standard, widely used for its high strength, toughness, and weldability. The "G3" in S355J2G3 specifically refers to the delivery condition of the steel, indicating it is supplied in a "normalized" state.
What is the difference between S355J2 and S355J2 N?
Difference between both:
S355J2 +AR steel plate and S355J2+ N steel plate differ primarily by the delivery condition when supplying, with S355J2+AR steel plate being delivered As Rolled, and S355J2+N steel plate being delivered after normalizing heating treatment.
What material is S355J2G3 N?
S355J2G3 steel is a carbon manganese ,high yield non alloy steel. It is called S355 because of the average minimum yield for this material is 355 Mpa.As a structural steel,it has excellent strength and weldability.It can be readily welded to other weldable steel.
What material grade is S355J2 N?
S355J2+N is a non-alloy structural steel that has excellent cold-forming properties. It is tensile strength between 490 and 630 N/mm2. They are produced per the requirements & regulations for the relevant items. Structural steel plates of the S355J2+N EN 10025-2 size range from 101mm to 200mm.
What is the impact test for S355J2G3?
S355J2G3 Stock,EN 10025-2 S355J2G3,S355J2G3 Steel Plate,S355
EN 10025-2 is hot rolled products of structural steel plates; the impact test is 0 degree, 20 degree, -20 degree, and -40 degree. In usual heat treatment is TMCP and normalized.
