S235JR: Steel Technical Specifications

1. S235JR Steel: Introduction and General Characteristics

S235JR steel is a non-alloy structural steel, hot-rolled, compliant with the EN 10025 series, with specific requirements defined in part 2 for weldable grades of medium strength and general delivery conditions described in part 1 of the European standard, constituting the technical reference for flat and long products intended for metal fabrication.

The designation follows EN 10027-1: the letter “S” indicates structural use, the number “235” the minimum nominal yield strength in MPa for thicknesses up to 16 mm, while the suffix “JR” indicates the Charpy impact energy class with a minimum energy of 27 J tested at +20 °C according to EN 10025-2, with general conditions in EN 10025-1.

In official manufacturer technical data sheets, S235JR is described as a “mild” steel, easily weldable and bendable, with typical tensile strength ranges of 360-510 MPa and minimum yield strength that decreases slightly with increasing thickness, as required by the standard. The JR impact energy guarantee (27 J at +20 °C) is explicitly stated in the delivery specifications for plates and sections according to EN 10025-2, supporting the choice for standard structural applications not exposed to service temperatures below zero.

In terms of production and traceability, the usual metallurgical identification is 1.0038 (S235JR) or 1.0122 (S235JRC) depending on the variant, as reported in company technical data sheets aligned with the European standard. For the placing on the market of structural products in buildings and works, compliance with CPR regulation and CE marking procedures integrates with the use of steels compliant with EN 10025, ensuring transparency in declared performance and production controls.

1.1. Differences Between S235JR and Conventional Steels

Compared to a generic “S235” without suffix, S235JR steel specifies a minimum impact toughness requirement of 27 J at +20 °C, a function of the “JR” suffix defined in EN 10027-1/EN 10025-2, while the “J0” variant requires 27 J at 0 °C and “J2” 27 J at −20 °C, with the same nominal yield strength level but different thermal suitability.

The nominal tensile mechanical properties (for example 360-510 MPa for many thickness ranges) are consistent within the tolerances of EN 10025-2, with a reduction of the yield strength as thickness increases, a common aspect for non-alloy structural steels and documented in the delivery data sheets.

Compared to “conventional” low-strength fabrication steels not covered by the EN 10025 series, S235JR ensures harmonized European requirements on composition, testing and traceability, reducing design and qualification uncertainties compared to products without a unified EN specification.

In official catalogues, S235JR is described as easily weldable and workable thanks to the low carbon content and the absence of alloying elements that increase hardenability, differentiating it from alloy or micro-alloyed steels that require more stringent welding and heat treatment procedures. From a performance perspective, the differences between S235JR and S235J0/J2 concentrate on temperature toughness, relevant for cold environments or those subject to impact, while for temperate environments the JR represents the most cost-effective option at the same static requirements.

It remains good practice to avoid automatic “equivalences” with non-EN grades without documentary verification, since composition ranges, testing criteria and impact classes may diverge even at the same declared yield strength.

1.2. Advantages of S235JR for Industrial Applications

For light and medium fabrication applications, S235JR steel offers high weldability and formability at contained costs, facilitating cutting, bending and assembly in the workshop without preliminary treatments, as indicated in manufacturer data sheets compliant with EN 10025-2. The wide availability of shapes and dimensions in flat and long products according to the European industrial offer allows optimization of procurement and reduction of waste in sectors such as civil construction, machinery and general fabrication.

The presence of a harmonized regulatory framework (EN 10025-1/-2) supports structural design and conformity checks along the supply chain, reducing technical and administrative risks in tenders and construction sites. In regulatory terms, the use of S235JR in structural components falls within the CE marking pathways for construction products, with the drafting of the Declaration of Performance (DoP) and factory production control (FPC) systems required by the CPR Regulation and EN 1090-1 procedures for component manufacturers.

Traceability through EN 10204 inspection certificates (typically 3.1) allows test results to be linked to the supplied batch, enabling audits, welding qualifications and acceptance controls according to industrial quality practices. For non-cryogenic environments and predominantly static loads, the JR class represents an effective balance between performance, availability and cost, leaving the J0/J2 variants for contexts with low-temperature impact requirements.

1.3. Standards and Certifications for S235JR

The main reference for S235JR steel is EN 10025-2, which defines the technical delivery conditions for non-alloy structural steels, while EN 10025-1 establishes the general conditions applicable to hot-rolled flat and long products.

The grade designation follows EN 10027-1, which governs the symbolic system of letters and numbers used to express main use and properties, including the JR/J0/J2 impact energy suffixes. For the placing on the market of construction products, Regulation (EU) No. 305/2011 applies, with the obligation of a Declaration of Performance and CE marking, supported by assessment and verification procedures for constancy of performance, as indicated by the European Commission.

Manufacturers of structural steel components fall within the scope of EN 1090-1 for the certification of factory production control and for the correct application of CE marking on products placed on the European market. Material traceability and conformity are attested through EN 10204 documents, with the 3.1 certificate reporting the test results on the supplied batch and signed by the authorized representative of quality, independent from production.

The consistent use of these standards and certifications allows the full integration of S235JR into quality systems, welding qualifications and technical specifications for structural works, ensuring declared and verifiable performance along the supply chain.

2. Chemical Composition of S235JR Steel: Alloying Elements and Regulatory Specifications

The chemical composition of S235JR is regulated by EN 10025-2 for non-alloy structural steels, with limits on C, Mn, P, S and residual contents such as Cu and N, ensuring weldability and consistent performance for hot-rolled flat and long products. Manufacturer technical data sheets compliant with the standard typically indicate C ≤ 0,17%, Mn ≤ 1,40%, P ≤ 0,035%, S ≤ 0,035%, Cu ≤ 0,55% and N ≤ 0,012%, values that ensure good S235JR properties in terms of machinability and weldability in fabrication.

For greater thicknesses, the standard allows an increase in carbon content: several data sheets report a max C of 0,20% for t > 40 mm, keeping the P and S limits unchanged according to EN 10025-2.

The steel is supplied as “fully killed” with nitrogen-binding elements, typically total aluminium ≥ 0,020%, as described in the declarations of performance and structural section catalogues.

For suitability for hot-dip galvanizing, the standard UNI EN 10025-2:2019 (Option 5) refers to the classification in UNI EN ISO 14713-2 Table 1, which defines three categories based on chemical composition (Si, P):

• Category A: Si ≤ 0,030% and Si + 2,5P ≤ 0,090% (Standard reactivity).
• Category B: 0,14% ≤ Si ≤ 0,25% (P ≤ 0,035%) (Controlled reactivity).
• Category D: 0,25% < Si ≤ 0,35% (High reactivity, for consistent thicknesses).

The order must clearly specify the required Category to ensure the quality and thickness of the coating.

Table – Chemical composition of S235JR (Typical maximum values compliant with EN 10025-2 data sheets)

Note: some data sheets report for thicknesses > 40 mm a max C of 0,20%, with the remaining composition unchanged within EN 10025-2, an aspect to be verified in the EN 10204 3.1 certificate of the specific batch.

The combination of low C and S/P contents supports the S235JR weldability and cold-formability characteristics, with control of hardenability and behavior during galvanizing as per the classifications above.

2.1. International Equivalences of S235JR

In the European system, S235JR corresponds to material number 1.0038 and finds correspondence in the historical designations Fe360B/RSt37-2, as reported in authoritative technical data sheets and industrial repertoires, maintaining consistency with the S235JR chemical composition and the “JR” impact requirement of 27 J at +20 °C.

The “similar” designations listed for practical use include SS 1312 and Fe 360 BFN, to be understood as references of historical and commercial correspondence, not as binding regulatory equivalences under EN 10025. In market literature, functional correspondences to non-EN standards (e.g. ASTM A36, GB Q235, JIS SS400) are often proposed, useful for procurement pre-screening but not a substitute for verification of test documents and specific project performance.

In qualification and technical specification contexts, it is recommended to treat cross-standard “equivalences” as performance range comparisons (yield strength, tensile strength, impact energy) and not as regulatory identity, requiring a detailed comparison of chemical analysis, impact class and delivery conditions. For applications subject to CE marking and DoP, compliance must remain referred to EN 10025-2 and the correct identification of the S235JR grade, regardless of commercial analogies with non-EU grades.

3. Mechanical Characteristics of S235JR Steel: Properties and Structural Performance

For S235JR steel, EN 10025-2 defines the mechanical requirements as a function of thickness and delivery condition, with minimum yield strength of 235 MPa for t < 16 mm and typical tensile strength of 360-510 MPa, plus the minimum impact energy of 27 J at +20 °C characteristic of the JR designation. Compliant technical data sheets report the progressive reduction of yield strength with increasing thickness and the minimum reference elongations for longitudinal and transverse test pieces, consistent with the ranges indicated by the standard.

The usual delivery conditions for S235JR are +AR (as-rolled (untreated)) and +N (normalized/normalizing rolling), which must be explicitly indicated in the order and marking because they affect testing and material qualification. The combination of low carbon content and the JR class allows good “S235JR characteristics” for general fabrication with correct “S235JR weldability” and adequate toughness at ambient temperature.

3.1. Mechanical Properties of S235JR in “Annealed” State

EN 10025-2 does not provide for a “full annealed” state for S235JR, but rather +AR, +N and +M states, which must be included in the order and delivery designation. In practice, for the base +AR state, the compliant data sheet typically reports ReH ≥ 235 MPa for t ≤ 16 mm, ReH ≥ 225 MPa for 16 < t ≤ 40 mm, Rm 360-510 MPa and A5/A80 as per the thickness and test direction table. In the +N condition, the mechanical requirements remain those of EN 10025-2, with explicit indication of the delivery condition on the EN 10204 certificate and product labelling.

Normalizing (+N) tends to make toughness and impact response more uniform compared to +AR, an aspect to be verified with heat/batch tests and project specifications.

Table – Mechanical properties of S235JR (compliant excerpts)

• ReH t ≤ 16 mm: ≥ 235 MPa
• ReH 16 < t ≤ 40 mm: ≥ 225 MPa
• Rm (wide range for many thicknesses): 360-510 MPa
• KV +20 °C (JR): ≥ 27 J

3.2. Mechanical Strength of S235JR in Quenched and Tempered State

Steels supplied in quenched and tempered condition (quenching + tempering) are covered in part EN 10025-6 relating to high yield strength grades in Q+T condition, while S235JR falls under EN 10025-2 for non-alloy structural steels and is not provided for quenched and tempered delivery.

Therefore, there are no “grade” requirements for quenched and tempered S235JR in EN 10025-2, and any special heat treatment cycle must be subject to agreement and qualified through batch testing according to the test and certification section of the same standard. For projects requiring quenched and tempered steel properties, reference should be made to grades compliant with EN 10025-6 or dedicated technical specifications, avoiding non-regulatory assimilations.

3.3. Hardness of S235JR After Heat Treatment

EN 10025-2 does not prescribe an “S235JR hardness” requirement at grade level, since conformity is verified through tensile and impact tests, not through mandatory HB/HV values. Any hardness values reported by manufacturers are typical/indicative values and must be read together with the delivery condition and the mechanical properties certified in EN 10204, not constituting in itself a regulatory requirement of the grade.

For acceptance controls or correlations with “S235JR machinability” and wear, reference must be made to 3.1 certificates and, where required, additional tests agreed upon at order should be requested according to the standard’s options.

3.4. Impact Energy and Toughness of S235JR

The JR designation implies a minimum impact energy of 27 J at +20 °C on a longitudinal Charpy V test piece, a requirement reported both by EN 10025-2 and by the S235JR grade delivery data sheets. The minimum impact values vary with the J0/J2 class for temperatures of 0/−20 °C, but for “S235JR properties” the JR class is specifically qualified at +20 °C.

The +N delivery can improve microstructural homogeneity with favourable effects on the stability of toughness in service, but the verification remains experimental and batch-specific.

3.5. Fatigue and Dynamic Behaviour of S235JR

Fatigue verification in steel structures is governed by Eurocode 3 – EN 1993-1-9, which adopts detail categories and S-N curves independent of the sole yield strength value for ordinary structural grades, including S235JR within the code’s field of application.

Fatigue resistance is therefore governed by the constructional detail, the quality of joints and finishes, and the correction factors provided by the code’s tables, more than by the change from S235JR to other grades of the same family. In the presence of dynamic and cyclic actions, design must apply the relevant detail categories, the partial factors γMf and any thickness effects according to the paragraphs and tables of EN 1993-1-9.

4. Physical Characteristics of S235JR Steel: Thermal and Structural Properties

The typical physical properties of S235JR steel for calculation and design purposes include a density of about 7,8-7,85 g/cm³, elastic modulus E ≈ 210 GPa, Poisson’s ratio and shear modulus G ≈ 80 GPa, as reported in official S235JR manufacturer technical data sheets compliant with EN 10025-2. The same data sheets include thermal coefficients such as the average linear expansion in the range 20-300 °C and specific heat around 50-100 °C, values commonly used for predicting thermal effects in fabrication and service. Complementary data on thermal conductivity (approximately 50-52 W/m·K at room temperature) and thermal capacity (approximately 0,47-0,50 kJ/kg·K) are reported in technical supply datasheets referring to S235JR/1.0038, useful for energy estimates in welding and surface treatments.

In the absence of mandatory requirements in EN 10025-2:2019 for physical quantities, in design it is recommended to maintain consistency between the values assumed in the models and those certified/indicated by the supplier for the specific batch, particularly for thermo-structural analyses.

Main structural properties

• Young’s modulus E≈210 GPa typical value used in the elastic sizing of components and joints in S235JR steel according to production practice and applied technical literature.
• Poisson’s ratio and shear modulus G≈80 GPa parameters consistent with non-alloy hot-rolled structural steels, useful for shear and torsion analysis.
• Density 7800/7850 kg/m³ reference for evaluating self-weight, inertia and transport in metal fabrication with compliant S235JR properties.

Reference thermal properties

• Average coefficient of linear expansion in the range 20-300 °C: quantity necessary to control clearances, tolerances and shrinkage effects in S235JR machinability.
• Thermal conductivity at 20-25 °C: useful for evaluating local thermal cycles in welding and thermal cutting, with S235JR heat treatment not required as a grade requirement.
• Specific heat around 20-100 °C: parameter for energy balances and thermo-mechanical simulations.

Application notes and tolerances

Variability with temperature and microstructure implies that the “typical” values of S235JR characteristics must be confirmed for the current supply, especially when performing thermo-structural analyses or processes with strong thermal gradients, verifying, where necessary, consistency between design and batch EN 10204 certifications.

For components subject to repeated heating or hot-dip galvanizing, the choice of the composition class for galvanizing indicated by manufacturers must be coordinated with the thermal parameters above, to mitigate residual deformations and stresses in fabrication S235JR applications.

5. Heat Treatments of S235JR Steel: Processes and Optimal Parameters

For S235JR steel, standard EN 10025-2:2019 governs delivery in +AR (as-rolled (untreated)), +N (normalized/normalizing rolling) and +M conditions, while it does not provide for grade requirements in quenched and tempered state, which is why “S235JR heat treatment” is to be understood mainly as normalizing or stress relieving and not as a prescriptive quenching and tempering cycle according to the standard.

Compliant technical data sheets also indicate that the material is not intended for quenching to obtain high hardness, although it can be subjected to normalizing or stress relieving for microstructural uniformity needs or to reduce residual stresses, with clear marking of the delivery condition and the relevant EN 10204 certificate.

In terms of “S235JR machinability” and “S235JR weldability”, thermal management must favour cycles that maintain the low hardenability typical of the “S235JR chemical composition”, limiting the risk of embrittlement and unwanted variations in toughness.

5.1. Quenching S235JR: Temperatures and Techniques

Official sources do not require or qualify quenching as a delivery condition for S235JR, and report that the grade is not intended for hardening treatments, favouring instead normalizing and stress relieving as accepted and certificate-traceable practices.

Some manufacturer data sheets, for application purposes, report indicative austenitizing parameters of around 920 °C with water quenching, specifying that such cycles are not among the requirements of EN 10025-2:2019 and must therefore only be considered subject to technical agreement and experimental batch verification. When high “S235JR hardness” is requested, the correct technical choice is normally the selection of a grade suitable for quenching and tempering (EN 10025-6) rather than imposing quenching cycles on S235JR, to avoid performance not guaranteed by the grade specification.

5.2. Tempering S235JR: Optimal Parameters

When quenching is performed on S235JR components for needs not covered by the standard, manufacturers indicate typical tempering ranges of 540-665 °C in air, with the operating rule of post-weld stress relieving at approximately 50 °C below the tempering temperature adopted, always followed by verification through mechanical tests on the batch.

Such conditions are to be considered “out of standard” with respect to EN 10025-2:2019 and require clear identification of the treatment condition on the EN 10204 certificate, with targeted checks on impact energy, tensile strength and, if agreed, hardness, to ensure the “S235JR characteristics” required by the project.

In toughness-sensitive applications, adequate tempering after severe heating/cooling cycles can mitigate stress gradients and property dispersion in the heat-affected zone, while still not replacing the grade requirements.

5.3. Normalizing S235JR: Conditions and Applications

Normalizing is the “S235JR heat treatment” technically most consistent with the standard, being associated with the +N delivery condition provided by EN 10025-2:2019 and explicitly reported in the order designations and product marking.

Technical data sheets indicate typical normalizing temperatures of around 920 °C with air cooling, aimed at uniforming the microstructure and stabilizing the “S235JR properties” in view of processing or service, including possible straightening needs or subsequent thermal cycles. For products delivered in +N, hot forming and/or further normalizing is declared admissible, provided they are documented and compliant with the batch specifications supplied with the 3.1 certificate according to EN 10204.

5.4. Quality Control of S235JR Heat Treatments

Quality control must be anchored to the requirements of EN 10025-2:2019 for tensile and impact tests of the JR class (27 J at +20 °C) and align with the additional test options provided by the standard, recording in the EN 10204 3.1 certificates the treatment condition and the test results of the supplied batch.

Documentary verification includes the consistency of the delivery condition (+AR, +N, +M) with the “S235JR applications” and with the contractual performance of the specifications, including any request for retesting after heat treatment to confirm the final “S235JR properties”.

For critical components, it may be useful to integrate metallographic and “S235JR hardness” checks as correlation tests, although hardness is not a mandatory grade requirement in EN 10025-2, when agreed as an additional test.

5.5. Common Defects and Solutions in S235JR Heat Treatments

In the thermal processing and welding of S235JR, the most typical risk is not excessive hardenability but cold cracking from hydrogen in thick joints or with high hydrogen input, managed through calculated preheating using the methods of EN 1011-2 based on carbon equivalent (CEV/CET).

Industrial guidelines implementing EN 1011-2 propose calculating the preheating based on CEV/CET, combined thickness, heat input and diffusible hydrogen of the consumable, providing curves or tables to set safe preheating and interpass temperatures in “S235JR weldability”.

The low carbon and alloying content of the “S235JR chemical composition” results in a contained CEV and, therefore, generally moderate preheating, but the final definition must follow EN 1011-2 with the actual joint parameters, consumables and real thickness, recording the values in the welding procedure and manufacturing reports.

6. Industrial Applications of S235JR Steel: Sectors and Strategic Uses

S235JR steel is a non-alloy structural steel for welded and cold-formed fabrication, used in flat and long products for load-bearing components subject to moderate static loads with good weldability and formability.

Technical data sheets and reference standards confirm its use in general metal construction, with wide industrial availability and JR class impact energy (27 J at +20 °C) suitable for service in temperate environments. The possibility of hot-dip galvanizing according to the composition classes indicated for S235JR facilitates the corrosion protection of exposed structures and fabrications.

6.1. Automotive Applications of S235JR

For traditional automotive applications, S235JR is used in secondary structural components and non-critical auxiliary frames where weldability and low cost are required, consistent with the “welded construction” intended use and the nature of a low-hardenability structural steel per EN 10025-2:2019. For transport systems and light vehicle fittings, it is used in brackets, supports and bodywork frames not subject to high strength requirements, with possible hot-dip galvanizing according to the suitability classification reported for S235JR.

Where low-temperature toughness or higher yield strength requirements exist, J0/J2 variants or higher grades of the same EN 10025-2 family are typically used, avoiding non-regulated equivalences.

6.2. Machine Tool Sector S235JR

In machinery and plants, S235JR is used for bases, frames, casings and welded support structures where flatness, ease of cutting/bending and cost containment are required, without the need for quenching and tempering treatments not provided for the grade.

Availability in hot-rolled plates and sections, with good dimensional tolerances, facilitates the standardization of frames and machine tables through welding and normalizing rolling (+N) when required. Compatibility with hot-dip galvanizing or industrial painting supports use in production environments with moderate exposure, subject to composition-coating coordination.

6.3. Mechanical Industry and Construction S235JR

S235JR is widely used in metal fabrication for buildings, warehouses, stairs, walkways and auxiliary structures thanks to weldability and the availability of formats in flat and long products compliant with EN 10025-2. Its classification as a structural steel and the regulated mechanical requirements (ReH ≥ 235 MPa for t ≤ 16 mm; KV 27 J at +20 °C) make it a reference material for elements with predominantly static loads in temperate climates.

For construction components subject to CE marking, compliance pathways apply according to the CPR Regulation and EN 1090-1 practice, following the selection of material compliant with EN 10025-2.

6.4. Specialist Sectors S235JR

For structures intended for hot-dip galvanizing, S235JR offers variants with composition classes for coating predictability, useful in light infrastructure, external stairs and railings. In industrial services and light plant engineering, the indication “applicated for welding constructions” allows use in frames, trestles, supports and service fabrications, with quality control through EN 10204 3.1 certificates. When higher performance levels or low-temperature toughness are required, S275/S355 grades and/or J0/J2 classes are preferred within the same regulatory framework.

6.5. Performance Comparison vs Other Steels

The table compares typical regulatory requirements between S235JR and adjacent grades of the same family to highlight application fields and design margins, with data compliant with EN 10025-2:2019 and manufacturer data sheets.

The choice between S235JR, S275JR and S355JR is guided by yield strength, toughness and mass requirements, to be balanced with “S235JR weldability” and the joint details that dominate fatigue resistance according to the Eurocodes, as well as with industrial availability and the protective cycles envisaged. For galvanizing and protection, the suitability classification of the S235JR variants supports finishing decisions consistent with the “S235JR chemical composition”.

7. Frequently Asked Questions about S235JR Steel: Technical Answers for Professionals

Below is a selection of operational FAQs on S235JR, with references to EN standards and compliant technical data sheets for use in design, purchasing and quality control.

7.1. What does the “JR” suffix mean in S235JR?

The JR suffix indicates that the steel has a minimum impact energy of 27 J at +20 °C on a Charpy V test piece according to the EN 10027-1 designation and the requirements of EN 10025-2:2019 for non-alloy structural steels.

7.2. What is the difference between S235, S235JR, S235J0 and S235J2?

All share the nominal yield strength limit of 235 MPa for small thicknesses, but JR/J0/J2 differ in the temperature at which the impact energy is guaranteed: 27 J at +20 °C (JR), 27 J at 0 °C (J0), 27 J at −20 °C (J2) according to EN 10027-1 and EN 10025-2 tables.

7.3. What are the typical minimum mechanical requirements of the grade?

For many flat/long formats, ReH ≥ 235 MPa for t ≤ 16 mm applies, tensile strength of approximately 360-510 MPa and impact energy of 27 J at +20 °C, according to EN 10025-2:2019 and compliant datasheets of the S235JR grade.

7.4. What is the indicative maximum chemical composition for S235JR?

Compliant technical data sheets report typical limits of C ≤ 0,17%, Mn ≤ 1,40%, P ≤ 0,035%, S ≤ 0,035%, Cu ≤ 0,55% and N ≤ 0,012%, consistent with the non-alloy structural steel profile of EN 10025-2.

7.5. Is S235JR weldable and what are the qualification references?

The low carbon content and its classification under EN 10025-2:2019 make it suitable for welded constructions; batch documentation must include the EN 10204 certificate (typically 3.1) and, if necessary, verification of the carbon equivalent for procedures according to EN 1011-2 practice reported in technical guides.

7.6. Is it suitable for hot-dip galvanizing?

The data sheets for S235JR classify suitability based on silicon content (galvanizing classes) to predict coating thickness and appearance, offering Si and P ranges to support protective treatments.

7.7. What delivery conditions are provided and how do they affect the properties?

The accepted conditions are +AR (as-rolled (untreated)), +N (normalized/normalizing rolling) and +M according to EN 10025-2; the condition must be reported in the designation and affects microstructural homogeneity and impact response.

7.8. What documents and markings are required for structural use in works?

For structural components placed on the EU market, CE marking pathways apply under EN 1090-1 with FPC certified by a Notified Body, in addition to material certificates according to EN 10204 that ensure traceability of tests and conformity.

7.9. Is S235JR suitable for fatigue verification according to the Eurocodes?

Fatigue resistance is addressed by EN 1993-1-9 through detail categories and S-N curves, where the grade S235JR is included as a structural steel; fatigue performance depends mainly on the constructional detail and the quality of the joint.

7.10. Is hardness regulated by grade requirements or only indicative?

EN 10025-2:2019 does not set an “S235JR hardness” value as a mandatory grade requirement, since conformity is based on tensile and impact tests; any HB/HV values present in the datasheets are informative and must be read together with the delivery condition and the 3.1 tests.

8. The Siderticino Offer for S235JR Steel: Specialist Solutions

Siderticino makes S235JR available in a targeted portfolio for fabrication and light mechanics, compliant with EN 10025-2:2019 for non-alloy structural steels and with documentary traceability according to EN 10204. The offer includes cold-drawn semi-finished products and, where indicated, hot-rolled products, focusing on the weldability and machinability typical of the grade in general applications.

Reference standards and designation

All S235JR products are governed by EN 10025-2:2019 for the technical delivery conditions, while the JR designation derives from the EN 10027-1 system with a requirement of 27 J at +20 °C in Charpy V testing. Correct indication of the delivery condition (+AR/+N/+M if applicable) and the impact energy class in the order documentation is an essential part of grade compliance.