The standard EN 10025 (European Standard for hot-rolled structural steel) uses specific symbols and designations to classify steel grades based on their mechanical properties, chemical composition, and quality requirements. Below is a breakdown of the symbols and their meanings:

General Structure of Steel Grade Designations in EN 10025

A typical steel grade in EN 10025 follows this format:
S / E + [Yield Strength] + [Quality/Impact Resistance] + [Special Requirements]

1. Prefix Letters

S: Indicates structural steel (used for general structural applications).

E: Indicates engineering steel (used for mechanical components, e.g., shafts, gears).

2. Yield Strength (in MPa)

A numerical value representing the minimum yield strength (at 16 mm thickness) in megapascals (MPa).Examples:

S235: Yield strength ≥ 235 MPa.

S355: Yield strength ≥ 355 MPa.

3. Quality and Impact Resistance Symbols

These letters denote the impact test requirements (Charpy V-notch test) and quality levels:

 

JR (or J2G3 in older standards):

Impact tested at +20°C (minimum energy: 27 J, longitudinal sample).

J0:

Impact tested at 0°C (minimum energy: 27 J).

J2:

Impact tested at -20°C (minimum energy: 27 J).

K2:

Impact tested at -20°C with higher energy requirement (minimum 40 J).

N:

Indicates normalized or normalized rolled steel (improves mechanical properties).

M:

Indicates thermo-mechanically rolled steel (no need for post-rolling heat treatment).

ML:

Thermo-mechanically rolled steel with improved low-temperature properties.

4. Special Requirements (Optional)

W: Weather-resistant steel (e.g., S355W).

H: Hollow sections (e.g., S355H).

Z: Z-direction properties (resistance to lamellar tearing, e.g., S355Z25).

Example Grade Breakdown

S355J2:

S: Structural steel.

355: Minimum yield strength 355 MPa.

J2: Impact tested at -20°C (27 J).

S275JR:

S: Structural steel.

275: Minimum yield strength 275 MPa.

JR: Impact tested at +20°C (27 J).

 

 

Key Symbols and Their Meanings

Symbol	Meaning
S	Structural steel
E	Engineering steel
235, 355, etc.	Minimum yield strength (MPa) at 16 mm thickness
JR	Impact tested at +20°C (27 J, longitudinal)
J0	Impact tested at 0°C (27 J)
J2	Impact tested at -20°C (27 J)
K2	Impact tested at -20°C (40 J, higher energy)
N	Normalized or normalized rolled
M	Thermo-mechanically rolled
ML	Thermo-mechanically rolled with improved low-temperature properties
W	Weather-resistant (e.g., corten steel)
Z	Z-direction properties (e.g., Z25, Z35 for resistance to lamellar tearing)

 

 

 

 

 

Why Choose Us?
We take pride in our ability to provide custom solutions for our customers' unique needs.
We analyze and compare the previous products and the current technical situation of our Symbols Used In EN 10025, and develop new technical specifications and processes.
Our customers trust us to deliver high-quality Cold-rolled Steel products on time and on budget.
We strictly implement the warm and thoughtful after-sales service, adhere to the development of good professional ethics.
We offer a wide range of Cold-rolled Steel products to meet diverse customer needs.
We adhere to the customer-centric and brand-oriented business philosophy, and continue to provide customers with reliable and excellent products and services.
Our factory is committed to upholding the highest standards of safety and quality.
All staff of our company and all departments work together to combine business management, professional technology, quantitative statistical methods and ideological education.
Our Cold-rolled Steel products are known for their durability and reliability.
Relying on the superior conditions and strong advantages of mass production, we are able to meet the different needs of our customers.

Hot Tags: symbols used in en 10025, China symbols used in en 10025 suppliers, factory, CR180BH, CR2 Steel, HR500LA, CR300LA, Low carbon High strength, CR240LA