S275J2 is a European standard (EN 10025-2) non-alloy structural steel known for its good weldability, formability, and toughness, especially at low temperatures, indicated by the "J2" (27 joules impact energy at -20°C). It offers a minimum yield strength of 275 MPa, making it a versatile, high-tensile steel used in bridges, power plants, and wind towers, often supplied normalized or control rolled.
Properties:
Yield Strength: Minimum 275 MPa.
Tensile Strength: 430-580 MPa.
Elongation: Around 23%.
Hardness: Typically 130-180 HB (Brinell).
Applications:
General structural purposes.
Bridge construction.
Power plants.
Wind tower components.
What does the 'J2' in S275J2 mean?
The 'J2' in S275J2 is a toughness designation defined by the European standard EN 10025-2. It specifies the steel's guaranteed resistance to brittle fracture at low temperatures, achieved through specific testing and manufacturing controls.
Detailed Breakdown:
J: Stands for "Charpy V-notch Impact test", with energy measured in Joules.
2: Indicates the test temperature of -20 degrees Celsius (-4°F).
Key Meaning in Practice:
The 'J2' designation certifies that the steel:
Has been impact-tested at -20°C using standardized Charpy V-notch samples.
Absorbs a minimum of 27 Joules of energy during the test, ensuring adequate toughness to resist crack propagation in cold conditions.
Is produced with fine-grain practice and often normalized (or controlled-rolled) to achieve this low-temperature toughness.
Comparison with Other Grades:
S275JR: Tested at +20°C.
S275J0: Tested at 0°C.
S275J2: Tested at -20°C – making it suitable for cold climates, outdoor structures, and applications where temperatures regularly drop below freezing.
Why It Matters:
This designation ensures structural reliability in harsh environments, such as bridges in cold regions, offshore platforms, wind towers, and unheated storage facilities, where low temperatures could otherwise cause brittle failure.
In short, 'J2' is a mandatory quality marker for low-temperature performance, distinguishing S275J2 from milder grades and making it a code-specified choice for cold-region engineering.
Chemical composition % of steel S275J2 (1.0145): EN 10025-2-2004
| Nominal thickness =< 40(mm) CEV max = 0.40 |
| C | Mn | P | S | Cu | CEV |
| max 0.18 | max 1.5 | max 0.03 | max 0.03 | max 0.55 | max 0.42 |
1. What is S275J2 steel?
S275J2 is a non-alloy structural steel grade per EN 10025-2, with a minimum yield strength of 275 MPa and guaranteed impact toughness at -20°C.
2. What does the 'J2' in S275J2 mean?
The 'J2' indicates Charpy V-notch impact testing at -20°C, ensuring a minimum absorbed energy of 27 Joules for use in cold environments.
3. What are the main applications of S275J2?
It is used in structural components exposed to cold climates, such as bridges, offshore platforms, transmission towers, and industrial buildings in regions with harsh winters.
4. What is the difference between S275JR and S275J2?
S275JR is impact tested at +20°C, while S275J2 is tested at -20°C, making J2 suitable for applications where temperatures drop well below freezing.
5. What is the yield strength of S275J2?
The minimum yield strength is 275 MPa for thicknesses up to 16 mm, with decreasing values for thicker sections as per the standard.
6. Can S275J2 be welded?
Yes, S275J2 has good weldability. However, proper procedures-including potential preheating and use of suitable filler metals-are essential, especially for thick sections or welding in cold conditions.
7. What is the chemical composition of S275J2?
It typically contains max 0.20% Carbon, max 1.50% Manganese, and controlled levels of phosphorus and sulfur (e.g., P ≤ 0.035%, S ≤ 0.035%).
8. Is S275J2 equivalent to ASTM A572 Grade 50?
No, S275J2 has lower yield strength (275 MPa vs. 345 MPa) and includes mandatory -20°C impact testing, while A572 Grade 50 generally has no mandatory toughness requirement.
9. What is the difference between S275J2 and S355J2?
S355J2 has a higher minimum yield strength (355 MPa) but similar impact toughness at -20°C, making it stronger for cold-weather applications.
10. Is S275J2 corrosion resistant?
No, S275J2 is not corrosion-resistant. Like other carbon structural steels, it requires protective coatings such as painting or galvanizing for outdoor use.
Full specification and details are available on request. The above information is provided for guidance purposes only. For specific design requirements please contact our technical sales staff.
