EN 10025-2 · Permanent stock

Structural plate S275JR and S355J2+N

Technical distribution of hot-rolled carbon steel structural plate. Permanent stock in thicknesses 6-250 mm, EN 10204 3.1 certification, immediate delivery throughout Spain.

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3.1 Certificate
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S355J2+N Specifications
Yield strength (ReH) ≥ 355 MPa
Tensile strength (Rm) 470-630 MPa
Elongation (A5) ≥ 22%
Charpy test 27 J @ -20°C
Stock thicknesses 6 - 250 mm
Formats 2000/2500/3000 x 6000–12000
Certification EN 10204 3.1
Equivalents St52-3, E36-3
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S275JR Specifications
Yield strength (ReH) ≥ 275 MPa
Tensile strength (Rm) 410-560 MPa
Elongation (A5) ≥ 23%
Charpy test 27 J @ +20°C
Stock thicknesses 6 - 250 mm
Formats 2000/2500/3000 x 6000–12000
Certification EN 10204 3.1
Equivalents St44-2, A283 Gr.D
Check availability

Complete technical data

Detailed information according to EN 10025-2:2019 for the correct specification and use of structural plate.

Mechanical properties by thickness range

Grade Thickness (mm) ReH min (MPa) Rm (MPa) A5 min (%) Charpy (J) Temp. (°C)
S275JR ≤ 16 275 410-560 23 27 +20
16-40 265 410-560 22 27 +20
40-63 255 410-560 21 27 +20
S355J2+N ≤ 16 355 470-630 22 27 -20
16-40 345 470-630 22 27 -20
40-63 335 470-630 21 27 -20

Maximum chemical composition (%)

Grade C max * Si max * Mn max P* max S max N max Cu max
S275JR 0.21* - 1.50 0.035 0.035 0.012 0.55
S355J2+N 0.20* 0.55* 1.60 0.025 0.025 - 0.55

C max. ≤ 0.25% and Si max. ≤ 0.14% (also check Phosphorus).

If the material is intended for galvanizing, Silicon, Carbon and Phosphorus must meet additional requirements. Please contact us.

Stock thicknesses with availability

Thickness (mm) Available formats Availability
6 2.000×6.000–12.000 / 2.500×6.000–12.000 / 3.000×6.000–12.000 ✓ Immediate
8 2.000×6.000–12.000 / 2.500×6.000–12.000 / 3.000×6.000–12.000 ✓ Immediate
10 2.000×6.000–12.000 / 2.500×6.000–12.000 / 3.000×6.000–12.000 ✓ Immediate
12 2.000×6.000–12.000 / 2.500×6.000–12.000 / 3.000×6.000–12.000 ✓ Immediate
14 2.000×6.000–12.000 / 2.500×6.000–12.000 / 3.000×6.000–12.000 ✓ Immediate
15 2.000×6.000–12.000 / 2.500×6.000–12.000 / 3.000×6.000–12.000 ✓ Immediate
16 2.000×6.000–12.000 / 2.500×6.000–12.000 / 3.000×6.000–12.000 ✓ Immediate
18 2.000×6.000–12.000 / 2.500×6.000–12.000 / 3.000×6.000–12.000 ✓ Immediate
20 2.000×6.000–12.000 / 2.500×6.000–12.000 / 3.000×6.000–12.000 ✓ Immediate
22 2.000×6.000–12.000 / 2.500×6.000–12.000 / 3.000×6.000–12.000 ✓ Immediate
25 2.000×6.000–12.000 / 2.500×6.000–12.000 / 3.000×6.000–12.000 ✓ Immediate
30 2.000×6.000–12.000 / 2.500×6.000–12.000 / 3.000×6.000–12.000 ✓ Immediate
35 2.000×6.000–12.000 / 2.500×6.000–12.000 / 3.000×6.000–12.000 ✓ Immediate
40 2.000×6.000–12.000 / 2.500×6.000–12.000 / 3.000×6.000–12.000 ✓ Immediate
45 2.000×6.000–12.000 / 2.500×6.000–12.000 / 3.000×6.000–12.000 ✓ Immediate
50 2.000×6.000–12.000 / 2.500×6.000–12.000 / 3.000×6.000–12.000 ✓ Immediate
55 2.500×up to 12.000 ✓ Immediate
60 2.500×up to 12.000 ✓ Immediate
65 2.500×up to 12.000 ✓ Immediate
70 2.500×up to 12.000 ✓ Immediate
75 2.500×up to 12.000 ✓ Immediate
80 2.500×up to 12.000 ✓ Immediate
90 2.500×length on request → On request
100 2.500×length on request → On request
110 2.500×length on request → On request
120 2.500×length on request → On request
130 2.500×length on request → On request
140 2.500×length on request → On request
150 2.500×length on request → On request
160 2.500×length on request → On request
180 2.500×length on request → On request
220 2.500×length on request → On request
250 2.500×length on request → On request

Comparison S275 vs S355

Select the appropriate grade according to your project requirements, balancing mechanical strength, cost and application.

Feature S275JR S355J2+N
Yield strength (ReH) 275 MPa 355 MPa (+29%)
Tensile strength (Rm) 410-560 MPa 470-630 MPa
Low-temperature toughness 27 J @ +20°C 27 J @ -20°C
Price/quality ratio Economical Optimal
Possible thickness reduction Base Up to -23%
Use outdoors/cold climate Limited Recommended
Execution class EXC2-EXC3 Possible Ideal
Weldability Excellent Very good
Delivery condition As rolled (AR) Normalized (+N)
Typical applications General structures, warehouses, enclosures Demanding structures, bridges, heavy machinery

Sectors that trust us

Mayor Steel supplies S275JR and S355J2+N structural plate to the main industrial sectors in the Basque Country and Spain.

Boilermaking and structural fabricators

Manufacturing of metal structures, industrial warehouses, frames and structural elements according to Eurocode 3.

S355J2+N S275JR

Machinery manufacturers

Chassis, frames, bodies and structural components for industrial machinery and construction equipment.

S355J2+N S690 QL

Cutting centers (oxy-fuel, plasma, laser)

Agile supply of plates in standard format for oxy-fuel, plasma and laser cutting centers.

S275JR S355J2+N

Industrial vehicles

Bodies, chassis, platforms and structural elements for trucks, trailers and special equipment.

S355J2+N 450 HB

Energy and renewables

Structures for wind farms, solar plants, substations and energy equipment.

S355J2+N S355 J2W

Frequently asked questions

We answer the most common questions about S275JR and S355J2+N structural plate. If you need additional information, our technical team is at your disposal.

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The main difference lies in the yield strength: S275JR has a minimum yield strength of 275 MPa, while S355J2+N reaches 355 MPa. This means S355 can withstand loads 30% higher with the same thickness, allowing lighter designs. In addition, S355J2+N has better toughness at low temperatures (Charpy test at -20°C with a minimum of 27 J) and the +N designation indicates that it is normalized, which guarantees a more homogeneous microstructure and consistent mechanical properties throughout the piece.
The designation S355J2+N follows the coding system of standard EN 10025. The 'S' indicates structural steel. The number '355' represents the minimum yield strength in MPa. 'J2' designates the material's toughness: J means it has verified impact resistance via the Charpy test, and the '2' indicates that the test is carried out at -20°C with a minimum value of 27 Joules. The '+N' specifies the delivery condition: normalized, meaning it has undergone a normalizing heat treatment that improves the homogeneity of the mechanical properties.
For structures of execution class EXC2 according to Eurocode 3 (EN 1090-2), a 3.1 inspection certificate according to EN 10204 must be required. This certificate, issued by the manufacturer but verified by inspection personnel independent of the production department, includes test results specific to the supplied batch: chemical analysis, mechanical properties (yield strength, tensile strength, elongation), Charpy impact test where applicable, and dimensional verification. The 3.1 certificate guarantees the traceability of the material and its conformity with EN 10025-2.
In most cases, S355J2+N can be welded without prior preheating, provided that the recommendations of Eurocode 3 are followed and suitable welding procedures (WPS) are used. The carbon equivalent (CEV) of S355J2+N is generally below 0.45%, which gives it good weldability. However, for thicknesses above 30 mm or when working at ambient temperatures below 5°C, slight preheating (50-100°C) may be necessary to avoid the risk of hydrogen cracking. It is essential to use low-hydrogen filler consumables and follow the welding parameters specified in the WPS.
Mayor Steel maintains permanent stock of S275JR and S355J2+N structural plate in thicknesses ranging from 5 mm to 250 mm. The most in-demand thicknesses (5, 6, 8, 10, 12, 15, 20, 25, 30, 40, 50, 60, 80, 100, 120 and 150 mm) are available for immediate dispatch in standard formats of 2000x6000 mm and 2500x8000 mm. For intermediate thicknesses or special dimensions, please check availability. All our materials include an EN 10204 3.1 certificate and are stored at our facilities in Zierbena (Bizkaia), with delivery service throughout Spain, Portugal and southern France.
These designations indicate the low-temperature toughness of the steel, according to the Charpy impact test. JR means the material has verified impact resistance at room temperature (+20°C) with a minimum of 27 J. J0 indicates resistance at 0°C with 27 J. J2 guarantees resistance at -20°C with 27 J. K2 offers the highest toughness, with resistance at -20°C but with 40 J of absorbed energy. For outdoor applications or cold climates, J2 or K2 is recommended. S355J2+N is the most versatile and sought-after grade for metal structures in Spain, as it offers an optimal balance between mechanical strength, toughness and cost.
The fundamental difference lies in its purpose and chemical composition. Structural plate (S275JR, S355J2+N) is designed to withstand mechanical loads in structures, with an emphasis on yield strength and ductility. Wear-resistant plate is formulated to resist abrasion and wear, with a high carbon content and alloying elements such as chromium, manganese and boron that increase surface hardness up to 400-500 Brinell. Structural plate is more economical and weldable, ideal for metal structures. Wear-resistant plate is more expensive and requires special precautions when welding, but is indispensable for mining, quarrying or machinery subject to intense friction applications.

Do you need S275JR or S355J2+N structural plate?

Request a quote with no obligation. Our technical team will advise you on selecting the most suitable grade for your project.

Request by email Call: (+34) 944 80 21 41

S275JR and S355J2+N structural plate: technical distribution in Spain

What is structural plate and what is it used for?

Structural plate is a flat hot-rolled carbon steel product, specifically designed for structural applications according to standard EN 10025-2. The S275JR and S355J2+N grades are the most widely used in Spanish metal construction, both for building structures and for industrial machinery, bridges, warehouses and public works equipment. S275JR offers an excellent balance between mechanical strength and cost, with a yield strength of 275 MPa that makes it ideal for general structures. S355J2+N, with its 355 MPa yield strength and normalized condition, is the preferred choice for demanding projects requiring higher strength and better toughness at low temperatures.

Structural plate distributor in the Basque Country and Spain

Mayor Steel, strategically located in Zierbena (Bizkaia), in the heart of the Port of Bilbao, operates as a specialized technical distributor of structural steel plate. Our warehouse maintains permanent stock of S275JR and S355J2+N in thicknesses from 6 mm to 250 mm, in standard formats of 2000/2500/3000 x 6000–12000. All our materials include an EN 10204 3.1 certificate, guaranteeing complete traceability and compliance with European regulations. We serve boilermakers, structural fabricators, machinery manufacturers, cutting centers and the energy sector in the Basque Country, Navarre, Cantabria, Asturias and throughout Spain, France, Portugal and Morocco, with specialized technical advice.

EN 10204 3.1 certification and applicable standards

The correct specification of structural plate requires knowledge of the applicable standards. EN 10025-2:2019 defines the technical requirements for non-alloy structural steels, including mechanical properties, chemical composition and tolerances. EN 10204 establishes the types of inspection certificates: type 3.1 is mandatory for EXC2 class structures, and guarantees that the tests have been carried out on the actual batch supplied. At Mayor Steel we provide 3.1 certification as standard for all our S275JR and S355J2+N structural plates, facilitating the technical documentation required for CE marking of structures and compliance with Eurocode 3.

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