EN 10025-1 Standard Guide

Hot Rolled Products of Structural Steels Part 1: General Technical Delivery Conditions

IMPORTANT: This is Part 1 (General Conditions) covering requirements common to all parts. For specific steel grades and properties, refer to Parts 2-6.

1. EN 10025 Series Overview

The EN 10025 series consists of 6 parts:

Part	Description
Part 1	General technical delivery conditions (THIS PART)
Part 2	Non-alloy structural steels (S235, S275, S355, S450 grades)
Part 3	Normalized/normalized rolled weldable fine grain structural steels
Part 4	Thermomechanical rolled weldable fine grain structural steels
Part 5	Structural steels with improved atmospheric corrosion resistance (weathering steels)
Part 6	Flat products of high yield strength structural steels in quenched and tempered condition

2. Scope

Product Types	Flat and long products (plates, sheets, beams, channels, angles, bars, etc.)
Excluded Products	Structural hollow sections and tubes
Intended Use	Welded, bolted, and riveted structures (buildings, bridges, construction)
NOT Applicable To	Coated products or steel for general structural applications

3. Product Forms Covered

3.1 Flat Products

Plates (thick flat steel)
Sheet
Wide strip
Wide flats

3.2 Long Products (Sections)

Beams (I-beams, H-beams)
Channels (U-sections)
Angles (L-sections, equal and unequal leg)
T-sections
Z-sections
Bars (round, square, hexagonal, flat)
Bulb flats
Rod

4. Manufacturing Process

4.1 Steel Making Process

At manufacturer’s discretion EXCEPT open hearth (Siemens-Martin) process is prohibited
Can be reported to purchaser if specified at time of order

4.2 Deoxidation

Method specified in Parts 2-6 for each steel grade

4.3 Delivery Conditions

Various heat treatment conditions specified in Parts 2-6:

As-rolled (+AR)
Normalized (+N)
Normalized rolled (+NR)
Thermomechanically rolled (+TM)
Quenched and tempered (+QT)

5. Chemical Composition

5.1 Ladle Analysis

Mandatory – must comply with values in Parts 2-6
Manufacturer shall report values for each cast

5.2 Product Analysis

Optional – only when specified at time of order
Purchaser specifies number of samples and elements to be determined
Limits given in Parts 2-6

5.3 Carbon Equivalent Value (CEV)

Calculated using IIW formula for weldability assessment:

CEV = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15

All elements in % by mass
Must be reported in inspection document

6. Mechanical Properties

6.1 Required Properties

Tensile strength (Rm)
Yield strength (ReH or Rp0.2)
Elongation (A)
Impact strength (Charpy V-notch)

6.2 Important Notes on Heat Treatment

Condition	Stress Relief Considerations
Parts 2-5 grades	Stress relief >580°C or >1hr may deteriorate mechanical properties
Normalized/normalized rolled ReH ≥460 MPa	Max stress relief temperature: 560°C
Part 6 (quenched & tempered)	Max stress relief: at least 30°C below tempering temp. Contact producer!

6.3 Impact Properties

Not required for nominal thickness < 6 mm
For test pieces < 10 mm wide: reduce minimum values proportionally to cross-sectional area
Normally verified only at lowest specified temperature unless otherwise agreed

6.4 Through-Thickness Properties (Z-direction)

Optional – per EN 10164 if agreed at time of order
Improved deformation properties perpendicular to surface
Important for thick plates in highly restrained welded joints

7. Technological Properties

7.1 Weldability

All grades suitable for standard welding processes
Thermomechanical steels (Part 4) have enhanced weldability vs normalized steels
CEV calculated for weldability assessment

7.2 Formability

Requirements specified in Parts 2-6 as applicable

7.3 Hot-Dip Zinc-Coating Suitability

Must be specified at time of enquiry/order if required
Applicable to Parts 2, 3, 4, and 6
Improves durability/corrosion protection

7.4 Machinability

General requirements given in Part 2

8. Internal Soundness

Products shall be free from internal defects that would prevent intended use.

Ultrasonic Testing (Optional):

Flat products ≥6mm: EN 10160
H beams and IPE beams: EN 10306
Bars: EN 10308

9. Testing and Inspection

9.1 Types of Inspection

Inspection Type	Description
Specific Inspection	Testing carried out per frequency/methods specified in Parts 2-6
Non-Specific Inspection	No mandatory mechanical testing

9.2 Inspection Documents (EN 10204)

Must include information groups A, B, D, and Z per EN 10168:

Type 2.2: Manufacturer’s test report
Type 3.1: Inspection certificate validated by manufacturer’s inspector
Type 3.2: Inspection certificate validated by manufacturer AND independent body

9.3 Test Units

Specified in Parts 2-6 for each product type
Typically based on cast/heat number, grade, and thickness

9.4 Test Methods

Tensile test: EN 10002-1 (longitudinal for bars, transverse for plates where width permits)
Impact test: EN 10045-1 (Charpy V-notch)
Chemical analysis: EN ISO 14284

10. Sample Location and Orientation

10.1 Flat Products

Thickness ≤30mm: Longitudinal tensile test, samples midway between edge and centerline
Thickness >30mm: Transverse tensile test (width ≥600mm) or longitudinal (width <600mm)
Impact: Longitudinal, notch perpendicular to surface
For thickness ≥40mm (Parts 3,4,6): Impact at ¼ thickness position

10.2 Sections (Beams, Channels, Angles)

Samples from flange
Test pieces taken perpendicular to rolled surface
By agreement, may be taken from web at ¼ height

10.3 Bars and Rod

Diameter/thickness ≤25mm: Full section test piece if practical
Diameter/thickness >25mm: Machined test piece from mid-radius

11. CE Marking Requirements (Annex ZA)

For construction products under EU Construction Products Directive:

11.1 Regulated Characteristics

Tolerances on dimensions and shape
Elongation
Tensile strength
Yield strength
Impact strength
Weldability (chemical composition)
Durability (chemical composition)

11.2 Attestation of Conformity System

System 2+ applies:

Manufacturer responsibilities: FPC, initial type testing, routine testing
Notified body: Initial inspection of factory and FPC, continuous surveillance
FPC certificate required from notified body

11.3 Initial Type Testing

Required before first placement on market:

Intensive routine testing: 5 casts, minimum 6 products per cast
Supplementary testing (for certain high-strength grades): Transition curves, weldability tests

11.4 Required Inspection Document Types

Steel Grade Characteristics	Required Document
ReH ≤355 MPa, impact at 0°C or 20°C	Type 2.2
ReH ≤355 MPa, impact at <0°C	Type 3.1 or 3.2
ReH >355 MPa	Type 3.1 or 3.2

12. Marking and Labelling

12.1 Required Marking

Grade, quality, and delivery condition
Cast number (for cast-based inspection)
Manufacturer’s name or trademark
External inspection mark (where applicable)

12.2 Marking Location

Close to one end or on end cut face
For bundles: on label attached to bundle or top product
Positioned to avoid confusion with regulatory marking (CE marking)

13. Available Options (Clause 13)

The following options may be specified at time of enquiry/order:

Option	Description
1	Report steel making process
2	Product analysis (specify number of samples and elements)
3	Impact properties verified at specified temperature (other than lowest)
4	Through-thickness properties per EN 10164
5	Suitability for hot-dip zinc-coating
6	Ultrasonic testing for flat products ≥6mm (EN 10160)
7	Ultrasonic testing for H beams and IPE beams (EN 10306)
8	Ultrasonic testing for bars (EN 10308)
9	Witness inspection at manufacturer’s works
10	Type of marking required

14. Mandatory Information from Purchaser

Quantity to be delivered
Product form (plate, beam, angle, etc.)
Reference to relevant Part (EN 10025-2 through EN 10025-6)
Steel name or number (e.g., S355J2+N)
Nominal dimensions and tolerance class
All required options (see Clause 13)
Inspection and testing requirements
Type of inspection document required

15. Retests

EN 10021 applies for all retests and resubmission
For strip/rod: retest after cutting additional section (max 20m) to remove coil end effect
Impact test retest: If average fails OR 2+ values below minimum OR any value <70% of minimum, test 3 more. Average of 6 must meet requirements.

16. Key Differences: EN 10025 vs Other Standards

Aspect	EN 10025 (Structural)	EN 10111 (HR forming)	EN 10130 (CR forming)
Application	Building construction, bridges	Cold forming operations	Cold forming operations
Products	Plates, beams, sections, bars	Sheet, strip (coils)	Sheet, strip (coils)
Grade Series	S-series (S235, S355, etc.)	DD-series (DD11-DD14)	DC-series (DC01-DC07)
Key Property	Yield strength, weldability	Formability	Formability
CE Marking	Required	Not required	Not required

IMPORTANT REMINDER: This guide covers Part 1 (general conditions) only. For specific steel grades (S235, S275, S355, etc.) and their properties, refer to EN 10025-2 through EN 10025-6.