Sub-grade selection · Materials
JR, J0 and J2 differ by Charpy impact test temperature, which is why sub-grade — not just S355 — must appear on the order and the drawing.
S235 / S275 / S355Sections and plate
Source: BS EN 10025-2 / BS EN 1993-1-10
§ Standards
Status
CURRENT
Edition
2019
Last verified
2026-09-06
BSI · STANDARD
BS
EN 10025-2
Hot rolled products of structural steels — Non-alloy structural steels
§ 01
Overview
What this standard covers
Defines S235, S275 and S355 with their JR, J0, J2 and K2 sub-grades, setting yield strength, tensile range, chemistry and Charpy impact requirements.
Technical delivery conditions for flat and long products in non-alloy structural steels, including the impact energy that distinguishes each sub-grade.
Who uses it
Specifiers, buyers and mills confirming what a grade guarantees before it is ordered or substituted.
§ 02
Details
Reference data
- Standard number
- BS EN 10025-2
- Title
- Hot rolled products of structural steels — Non-alloy structural steels
- Organisation
- BSI
- Country
- United Kingdom
- Region
- United Kingdom
- Subject
- Materials
- Subcategory
- Non-alloy grades
- Type
- STANDARD
- Application
- Contractual
- Availability
- Paid
- Current edition
- 2019
- Publication year
- 2019
- Status
- CURRENT
- Roles
- material standard
- Last verified
- 2026-09-06
Official source: knowledge.bsigroup.com
§ 03
Requirements
Key requirements
§ 04
Related
Standards used alongside this one
- BS EN 1993-1-10
Eurocode 3: Material toughness and through-thickness properties
Sets permissible thickness for a given grade, sub-grade, service temperature and stress level, which is why a J2 or K2 sub-grade is often required rather than JR.
United KingdomMaterialsCURRENTPaid
- BS EN 10204
Metallic products — Types of inspection documents
Defines the certificate types: 2.1 and 2.2 as non-specific declarations, 3.1 issued by the manufacturer's independent inspection function, and 3.2 countersigned by an independent party.
United KingdomMaterial certificatesCURRENTPaid
- EN 10025-2
Hot rolled structural steels — Non-alloy structural steels
The European source standard for S235, S275 and S355 grades and their impact sub-grades.
European UnionMaterialsCURRENTPaid
- ASTM A36/A36M
Carbon Structural Steel
The long established 36 ksi carbon structural grade, still common for plate, angle and channel.
United StatesMaterialsCURRENTPaid
- ASTM A370
Test Methods and Definitions for Mechanical Testing of Steel Products
How tensile, bend and impact tests on steel products are performed and reported — the basis of the values printed on a US mill certificate.
United StatesMaterialsCURRENTPaid
- ASTM A500/A500M
Cold-Formed Welded and Seamless Carbon Steel Structural Tubing
The usual US HSS specification for round, square and rectangular tubing, with grades B and C in common use.
United StatesMaterialsCURRENTPaid
Sourcing, review and use
Status
Editorial reference information compiled and maintained by the StructuralSteel.ai team. It is not a design certificate and is not issued under an engineer's seal.
Last reviewed
Calculations
Any figures produced on this page are indicative estimates for early sizing and comparison only — they are not engineered design outputs.
References
Final member selection, loading, connection design, fire design, fabrication and compliance must be verified for your specific project by a suitably qualified structural engineer. Standards are revised; check the edition in force where the work is built.
Verification
StructuralSteel.ai provides technical reference information and links to authoritative sources. Project specifications, applicable legislation, current standards editions and requirements of the responsible engineer or authority should always be verified before fabrication or supply.