S275JR (EN 10025-2) Equivalent Steel Material in China
The direct and most commonly accepted equivalent to European standard S275JR in China is Q275B according to the national standard GB/T 700 (Carbon Structural Steels).
Here is a detailed comparison table:
Primary Equivalent: GB/T 700 Q275B
Standard |
EN 10025-2 |
GB/T 700 |
Different standard systems but analogous purpose. |
| Grade Designation Meaning |
S = Structural
275 = Min Yield (MPa)
J = +20°C Impact
R = 27 J Min |
Q = Yield Strength Character
275 = Min Yield (MPa)
B = Quality Grade (Room Temp Impact) |
The letter coding differs, but the 275 MPa yield strength and room-temperature impact test are directly analogous. |
| Minimum Yield Strength (ReH/Rel) |
275 MPa (for thickness ≤ 16 mm)
Decreases with thickness |
275 MPa (for thickness ≤ 16 mm)
Decreases with thickness |
Key property match. Both standards specify reduced yield for thicker sections. |
| Tensile Strength (Rm) |
410 - 560 MPa |
410 - 540 MPa |
Nearly identical range. |
| Impact Toughness (KV) |
≥ 27 J at +20°C |
≥ 27 J at +20°C |
Identical requirement. The "B" grade in GB/T 700 mandates this test. |
| Chemical Composition (Max %) - Typical |
C: 0.21
Mn: 1.50
Si: 0.55
P: 0.045
S: 0.045 |
C: 0.21
Mn: 1.50
Si: 0.35
P: 0.045
S: 0.045 |
Very close. Main difference: Q275B has a lower maximum Silicon (Si) content (0.35% vs 0.55%). |
| Deoxidation / Grain Practice |
Fine grain practice (e.g., Al min) required. |
Typically killed steel (镇静钢), but grain refinement not explicitly mandated like in EN. |
S275JR has stricter metallurgical control for grain size. |
| Primary Application |
General construction, building frames, machinery. |
General construction, building frames, machinery. |
Functionally interchangeable for most non-critical structural purposes. |
Important Context & Other Potential Chinese Equivalents
GB/T 1591 (High Strength Low Alloy) |
Q275B (under GB/T 1591) |
If specified under the high-strength standard. |
GB/T 1591 has slightly different chemical rules. GB/T 700 Q275B is the more common match. |
| GB/T 700 |
Q275A |
If no impact toughness is required. |
Q275A has NO Charpy impact test requirement. This makes it equivalent to the non-existent "S275" without the "JR". |
| GB/T 700 |
Q235B |
Incorrect but common mistake. Q235B has lower yield strength (235 MPa). |
Weaker. Used for less demanding structures. |
| GB/T 699 (Quality Carbon) |
25# or 30# Steel |
For machining parts, not structures. |
These are quality carbon steels for engineering components, not structural sections. |
Substitution Advisory Table
| Situation |
Recommended Chinese Equivalent |
Reason |
| Direct Material Replacement in drawings/specs calling for EN 10025-2 S275JR. |
GB/T 700 Q275B |
Closest match in strength, toughness, and application scope. |
| Sourcing in China for export to markets using EN standards. |
Request material certified to EN 10025-2 S275JR from the mill. |
Ensures full compliance with the original standard, avoiding interpretation issues. |
| Designing per Chinese codes (GB 50017) for a similar performance level. |
Q275B (GB/T 700) |
The native material for Chinese structural design. |
| If impact toughness is NOT a requirement. |
Q275A (GB/T 700) |
Saves cost. Must be approved by designer. |
| For critical/welded structures where grain size control is important. |
Ensure the supplied Q275B meets fine grain practice or source EN-certified S275JR. |
S275JR's standard mandates grain refinement; Q275B's does not explicitly. |
Final Note: While Q275B is the standard equivalent, for contractual and quality assurance on projects originally specified to EN standards, it is always recommended to source material with actual EN 10025-2 certification rather than relying on a "cross-standard equivalent." This avoids any dispute over subtle differences in manufacturing tolerances or testing procedures.
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