S275JR vs S355JR: They Are Not the Same Steel Grade
Although S275JR and S355JR are both specified under EN 10025-2, they are not the same type of steel and should not be used interchangeably.
- S275JR is a non-alloy carbon structural steel
- S355JR is a higher-grade low alloy structural steel
The key difference lies in strength level and alloying design, which directly affects load-bearing capacity, application range, and cost.
S275JR
S355JR is considered a higher steel grade than S275JR due to its higher yield strength and tensile strength, making it more suitable for heavy-duty structural applications.
Chemical Composition Comparison
Carbon Steel S275JR vs Low Alloy Steel S355JR (t ≤ 16 mm)
| Grade | C (max) | Si | Mn (max) | P (max) | S (max) | Cu (max) | N (max) |
|---|---|---|---|---|---|---|---|
| S275JR | 0.24 | - | 1.60 | 0.045 | 0.045 | 0.60 | 0.014 |
| S355JR | 0.27 | ≤0.60 | 1.70 | 0.045 | 0.045 | 0.60 | 0.014 |
Key note:
S355JR allows controlled silicon content and slightly higher carbon and manganese levels, contributing to improved strength while maintaining weldability.
Mechanical Properties Comparison
(EN 10025-2, t ≤ 16 mm unless otherwise stated)
| Grade | Yield Strength ReH (MPa) min | Tensile Strength Rm (MPa) | Elongation A (%) min | Charpy V Impact Test |
|---|---|---|---|---|
| (3 mm ≤ t ≤ 40 mm) | 20 °C / J min | |||
| S275JR | 275 | 410 – 560 | 23 | 27 |
| S355JR | 355 | 470 – 630 | 22 | 27 |
Engineering interpretation:
S355JR provides 29% higher minimum yield strength than S275JR
Both grades meet JR impact toughness requirements at 20 °C
S355JR enables lighter section design or higher load capacity
Application Guidance: Which One Should You Choose?
Choose S275JR Channel Steel when:
- Cost control is critical
- Loads are moderate
- Used in general buildings, frames, and light structural work
Choose S355JR Channel Steel when:
- Higher strength and load resistance are required
- Used in bridges, heavy machinery, industrial structures
- Structural weight reduction is a design goal
With extensive experience in EN structural steels, Gnee Steel supplies both:
S275JR Channel Steel
S355JR Channel Steel
Available in multiple sizes and lengths, with support for cutting, drilling, surface treatment, and export packaging.
For chemical composition details, mechanical property data sheets, specifications, or latest prices, feel free to contact Gnee Steel for technical support and quotations.
Contact us for latest S275JR Mild Steel Channel price list
What is S275JR grade steel?
S275JR grade steel is a readily weldable low carbon manganese steel with good impact resistance. This material is commonly supplied in the untreated or normalised condition. Machinability of this material is similar to that of mild steel.
What is S275JR steel equivalent to?
1 (American Welding Society) permits S275JR as an equivalent to A36 for welding purposes, and they are frequently interchanged in international projects. However, they are not identical: Standards: A36 is governed by ASTM (American), while S275JR follows EN (European), leading to differences in testing requirements.
What type of material is S235JR?
S235JR steel is a low-carbon structural alloy valued for its machinability, strength, and versatility. Perfect for complex components with tight tolerances, it is widely used in CNC machining for mechanical, structural, and industrial applications.
Are A36 and S275JR the same?
Both yield strength and tensile strength of S275JR carbon steel is higher than that of mild steel ASTM A36. So S275JR carbon steel can bear heavier load than mild steel ASTM A36. In other word, mild steel ASTM A36 is not equivalent to S275JR carbon steel.
What is the difference between S235JR and S275JR?
S235JR is used in less demanding applications, such as general construction, lightweight structures, and components where lower strength is sufficient (e.g., beams, columns, and frames). S275JR is preferred for applications requiring higher strength, such as heavier structural components, bridges, or machinery parts.