S275jr vs A36
Standards
A36 Steel: Complies with ASTM A36/A36M standards, and is an American standard carbon structural steel.
S275JR Steel: Complies with European standard EN10025-2 (e.g., EN10025-2:2014 or EN10025-2:2019), and is a European standard carbon structural steel.
Chemical Composition
A36 Steel: The main chemical components include carbon (C), silicon (Si), manganese (Mn), phosphorus (P), and sulfur (S). Specifically, the carbon content is ≤0.25%, the manganese content is between 0.8% and 1.2% (the range may vary slightly depending on the source), the phosphorus content is ≤0.04%, and the sulfur content is ≤0.05%.
S275JR Steel: The main chemical components also include carbon (C), silicon (Si), manganese (Mn), phosphorus (P), and sulfur (S), as well as possible trace alloying elements such as copper (Cu). Taking a steel plate thickness ≤40mm as an example, its carbon content ≤0.21%, manganese content ≤1.50%, phosphorus content ≤0.035%, sulfur content ≤0.035%, and nitrogen content ≤0.012%.
Chemical Composition Comparison
| Element | S275JR (%) | A36 (%) |
|---|---|---|
| Carbon (C) | ≤0.21 | 0.26-0.28 |
| Silicon (Si) | ≤0.50 | ≤0.55 |
| Manganese (Mn) | ≤1.50 | 1.03-1.20 |
| Phosphorus (P) | ≤0.035 | ≤0.04 |
| Sulfur (S) | ≤0.035 | ≤0.05 |
| Nitrogen (N) | ≤0.012 | - |
Mechanical Properties
A36 Steel: Possesses high strength, high toughness, good plasticity, and processing properties. Yield strength is typically ≥360MPa (some sources state ≥250MPa, but A36 steel usually has a higher yield strength).
S275JR Steel: Yield strength reaches 275MPa (some data indicate its yield point is not lower than 270MPa, but 275MPa is its standard value), tensile strength is between 430~580MPa, and elongation after fracture ≥14%. Furthermore, S275JR steel also has good impact toughness and bending properties.
Mechanical Properties Comparison
| Property | S275JR (MPa) | A36 (MPa) |
|---|---|---|
| Yield Strength (Re) | ≥270 | ≥250 |
| Tensile Strength (Rm) | 430-580 | 400-550 |
| Elongation (A) | ≥14% | ≥18% |
Delivery Conditions and Applications
A36 Steel: Widely used in construction, bridges, and machinery manufacturing, such as in the manufacture of beams, columns, steel plates, and steel structural frames for buildings; housings and bases for large motors and various pumps; and precision parts processing.
S275JR Steel: Delivery conditions include hot-rolled, controlled-rolled, and normalized. It is also widely used in construction, bridges, and machinery manufacturing, but more often in structural components requiring high load-bearing capacity and good toughness, such as bridges, high-rise buildings, industrial plants, various mechanical parts, bearings, transmission devices, structural components in shipbuilding, and equipment in the energy industry such as oil pipelines and storage tanks.
S275jr and A36 structural tube factory
