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Rebar Grades Explained
A quick map of the reinforcing-steel grades you will see on drawings and mill certificates worldwide.
| Grade | Yield | Standard | Notes |
|---|---|---|---|
| B500A / B / C | 500 MPa | BS 4449 / EN 10080 | A/B/C = rising ductility class |
| Grade 40 | 280 MPa | ASTM A615 | Legacy / light use |
| Grade 60 | 420 MPa | ASTM A615 | Most common US grade |
| Grade 75 / 80 | 520–550 MPa | ASTM A615 | High-strength |
| A706 (weldable) | 420 MPa | ASTM A706 | Controlled chemistry for welding |
| BSt500 / B500B | 500 MPa | DIN 488 | German equivalent |
Ductility classes (Europe)
BS 4449 / EN 10080 split 500 MPa steel into Class A, B and C by ductility (Rm/Re ratio and elongation). Class B (Rm/Re ≥ 1.08) is the common structural choice; Class C is for high-seismic design.
Compare specific grades: B500B vs Grade 60. See our TMT rebar range.
Frequently asked questions
What is the difference between B500A, B and C?
All have 500 MPa yield; the letter is the ductility class — A (lowest) to C (highest, for seismic). Class B is the usual structural grade.
Is Grade 60 the same as B500B?
Close but not identical — Grade 60 is 420 MPa (ASTM), B500B is 500 MPa (BS/EN). Substitution needs engineer approval.
Which grade is weldable?
Specify ASTM A706 (controlled chemistry) or B500B within its carbon-equivalent limit for site welding.
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