Overview of S275JR Steel of Hebei K-steel Pipe Industry
EN 10025-2 defines S275JR as a non-alloy steel grade widely used for general engineering and construction purposes.
“S” = Structural steel
“275” = Minimum yield strength of 275 MPa
“JR” = Impact test at +20°C (27J minimum)
2. Applicable Standards for Steel Pipes
S275JR material is typically used in pipes manufactured under:
2.1 Structural Steel Pipe Standards
EN 10219
EN 10210
Applications:
Structural tubing
Mechanical and construction pipes
2.2 Alternative Equivalent Standards
S275JR is often compared with:
ASTM A36 (USA equivalent)
Q275
3. Chemical Composition (Typical, %)
Element | Content (%) |
|---|
C (Carbon) | ≤ 0.21 |
Mn (Manganese) | ≤ 1.50 |
P (Phosphorus) | ≤ 0.035 |
S (Sulfur) | ≤ 0.035 |
N (Nitrogen) | ≤ 0.012 |
Low carbon content → good weldability and formability
4. Mechanical Properties
Property | Value |
|---|
Yield Strength | ≥ 275 MPa |
Tensile Strength | 410 – 560 MPa |
Elongation | ≥ 23% |
Impact Test | 27J @ +20°C |
5. Manufacturing Process of S275JR Pipes
5.1 Common Production Methods
ERW (Electric Resistance Welded)
LSAW (Longitudinal Submerged Arc Welded)
Seamless (less common for this grade)
5.2 Delivery Conditions
As-rolled
Normalized (optional for better properties)
6. Applications of S275JR Steel Pipes
Widely used in:
Structural construction (buildings, bridges)
Mechanical engineering
Steel frameworks
Low-pressure fluid transportation (water, air)
General fabrication
Not recommended for:
High-pressure pipelines
High-temperature or corrosive environments
7. Key Advantages
Good weldability
Moderate strength with good ductility
Cost-effective compared to alloy steels
Widely available in global markets
8. Limitations
Lower strength compared to high-grade steels (e.g., S355)
Limited corrosion resistance
Not suitable for oil & gas high-pressure service
9. Summary
S275JR steel pipe is a standard structural-grade carbon steel pipe under EN 10025-2, offering:
Reliable mechanical performance
Excellent fabrication properties
Broad application in construction and general engineering
Best suited for structural and low-pressure applications, rather than critical pipeline service.
