S275JR is a non-alloy, low-carbon structural steel grade defined under the European standard EN 10025-2. It is one of the most widely used steel grades in construction and engineering due to its balanced mechanical properties and cost-effectiveness.
Key Specifications
The designation "S275JR" provides a technical summary of the material's properties:
S: Indicates it is a Structural steel.
275: Specifies a minimum yield strength of 275 MPa (for thicknesses ≤ 16mm).
JR: Indicates a Charpy V-notch impact test requirement of at least 27 Joules at room temperature (+20°C).
Applications
S275JR is primarily used for manufacturing long and flat products for welded or riveted structures. Common uses include:
Construction: Beams, columns, and plates for buildings and bridges.
Engineering: Low-load machine parts like bushings, shafts, and axles.
Industry: Storage tanks, oil and gas platforms, and rail industry components.
Key Advantages
Weldability: Its low carbon content makes it exceptionally easy to weld using standard methods.
Machinability: Offers good machining performance similar to other mild steels.
Formability: Can be easily curved, folded, or cold-formed for various structural shapes.
Is S275JR equivalent to ASTM A36?
No, S275JR is not a direct equivalent to ASTM A36, although they are both widely used as general-purpose structural steels and share similar applications. The key differences lie in their strength values, testing requirements, and governing standards.
Key Differences:
| Property | S275JR (EN 10025-2) | ASTM A36 (USA) |
|---|---|---|
| Minimum Yield Strength | 275 MPa (for thickness ≤ 16 mm) | 250 MPa (≈36 ksi) |
| Tensile Strength | 410‑560 MPa | 400‑550 MPa |
| Impact Testing | Mandatory – 27 J at +20 °C (the "JR" requirement) | Not required by default (only if specified by purchaser) |
| Governing Standard | European (EN) | American (ASTM) |
| Chemical Composition | Tighter controls on P, S; slightly different C/Mn limits | More flexible composition ranges |
Practical Implications:
Strength: S275JR is slightly stronger in yield strength (275 MPa vs. 250 MPa). In some design contexts, this may allow modest material savings if substituting A36 with S275JR.
Toughness: S275JR guarantees impact toughness at room temperature, while A36 does not unless specifically ordered with supplementary requirements (e.g., A36 with Charpy testing).
Codes & Approval: For projects governed by European codes (Eurocodes), S275JR is the specified material. For American codes (AISC, ASME), A36 is the default. Substitution usually requires engineering approval and may involve recalculation or additional testing.
Closest ASTM Equivalent:
The nearest ASTM grade in terms of both strength and mandatory impact properties is ASTM A529 (Grade 50, yield 345 MPa, with impact requirements), but it still differs in strength level.
Conclusion: While S275JR and A36 are commercially interchangeable for many non-critical, general fabrication purposes, they are not technically equivalent due to differing strength minima and mandatory toughness certification. Any substitution in regulated construction or manufacturing must be evaluated by a qualified engineer and comply with the applicable design code.
S275JR carbon steel plate equivalent grades:
Warning! Only for reference
| EU | Germany | Japan | France | European old | Italy | China | Austria | Norway | Russia | Inter | Portugal | India |
| EN | DIN,WNr | JIS | AFNOR | EN | UNI | GB | ONORM | NS | GOST | ISO | NP | IS |
| S275JR | RSt42-2 | SS400 | E28-2 | Fe430B | Fe430B | Q275 | St42F | NS12142 | St4ps | E275B | FE430-B | IS2062 |
| St 44-2 | St430B | St4sp |
1. What is S275JR steel?
S275JR is a non-alloy structural steel grade per EN 10025-2, with a minimum yield strength of 275 MPa and guaranteed impact toughness at room temperature (+20°C).
2. What is the yield strength of S275JR?
The minimum yield strength of S275JR is 275 MPa for material thickness up to 16 mm, decreasing slightly for thicker sections as per the standard.
3. What is the difference between S235JR and S275JR?
S275JR has a higher minimum yield strength (275 MPa vs. 235 MPa), providing greater load-bearing capacity for similar dimensions and applications.
4. What does the 'JR' mean in S275JR?
The 'JR' indicates that the steel is Charpy V-notch impact tested at +20°C with a minimum absorbed energy of 27 Joules, ensuring room temperature toughness.
5. Is S275JR equivalent to ASTM A36?
While close in strength, S275JR (275 MPa yield) is slightly stronger than standard A36 (250 MPa yield) and includes a mandatory impact test, so they are not direct equivalents.
6. What is S275JR used for?
It is widely used in general construction, structural frames, machinery components, bridges, and industrial applications requiring higher strength than S235 grades.
7. Can S275JR be welded?
Yes, S275JR offers good weldability using common methods like SMAW, MAG, or TIG, without requiring pre-heating under normal conditions and moderate thicknesses.
8. What is the chemical composition of S275JR?
Its composition typically includes max 0.21% C, max 1.50% Mn, and controlled limits for phosphorus and sulfur (e.g., P ≤ 0.035%, S ≤ 0.035%).
9. Is S275JR corrosion resistant?
No, S275JR is not corrosion-resistant. Like other carbon structural steels, it requires protective coatings such as painting or galvanizing for outdoor use.
10. What are the mechanical properties of S275JR?
Key properties include a yield strength ≥275 MPa (for t≤16mm), tensile strength of 410-560 MPa, and minimum elongation of 22-23% depending on thickness.
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.
