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21CrMoV5-7 vs AFNOR 20CDV5.7 (French Designation) (EN 10269 Cross-Reference)
21CrMoV5-7 (Werkstoff 1.7709) to EN 10269 is the direct equivalent of AFNOR 20CDV5.7 per French standard NF A35-559. The two designations cover the same Cr-Mo-V Q+T bolting chemistry with essentially identical chemistry windows. Procurement specifications from French OEMs (EDF, Areva, Framatome, Alstom Power) typically call out 20CDV5.7 by name.
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At a Glance
| 21CrMoV5-7 (EN 10269) | AFNOR 20CDV5.7 (NF A35-559) | |
|---|---|---|
| Designation system | European Norm (EN) | Association Francaise de Normalisation (AFNOR) |
| Werkstoff | 1.7709 | (same chemistry — no separate number) |
| Procurement use | European-wide standard | French OEMs (EDF, Areva, Framatome, Alstom) |
| Service envelope | up to 550 deg C | up to 550 deg C |
Chemistry Comparison
| Element | 21CrMoV5-7 | 20CDV5.7 |
|---|---|---|
| C | 0.17 to 0.25 | 0.17 to 0.25 |
| Cr | 1.20 to 1.50 | 1.20 to 1.50 |
| Mo | 0.55 to 0.80 | 0.55 to 0.80 |
| V | 0.20 to 0.35 | 0.20 to 0.35 |
Mechanical Comparison
| Property | 21CrMoV5-7 | 20CDV5.7 |
|---|---|---|
| Tensile (Rm) | 700 to 850 MPa | 700 to 850 MPa |
| 0.2 percent proof (RT) | ≥550 MPa | ≥550 MPa |
| Service envelope | up to 550 deg C | up to 550 deg C |
When to Specify Which
Specify 21CrMoV5-7 for general European procurement and any project referencing EN 10269. Specify 20CDV5.7 when the French OEM drawing or French procurement specification names the AFNOR designation explicitly. The two grades are interchangeable in practice — dual-certification documents both designations from the same heat lot.
Form Availability
Both grades supplied in round bar and the full bolting form-factor range: stud bolts, hex bolts, heavy hex bolts, tap studs, nuts, washers and threaded rod.
Frequently Asked Questions
Q. Is AFNOR 20CDV5.7 the same as EN 10269 21CrMoV5-7?
Yes. Same Cr-Mo-V Q+T chemistry, same mechanical-property floors, same Q+T cycle. The AFNOR name 20CDV5.7 (NF A35-559) and the EN name 21CrMoV5-7 (EN 10269) refer to the same alloy.
Q. Which French OEMs typically use the 20CDV5.7 designation?
EDF (Electricite de France), Areva, Framatome and Alstom Power (now Siemens Energy France) procurement drawings often call out 20CDV5.7 by name. Modern French procurement increasingly migrates to EN 10269 21CrMoV5-7.
Q. What does the AFNOR code 20CDV5.7 mean?
20CDV is the AFNOR alloy code: 20 = approximately 0.20 percent C; C = chromium; D = molybdenum (D rather than M to avoid confusion); V = vanadium. The 5.7 numbers are the approximate Cr (5) and Mo (7) in units of 0.1 percent. Read as Cr 1.20 to 1.50 plus Mo 0.55 to 0.80 plus V 0.20 to 0.35.
Q. Can I dual-certify 21CrMoV5-7 and 20CDV5.7?
Yes. Same chemistry window in both standards. Dual-certification on the EN 10204 type 3.1 or 3.2 certificate documents simultaneous compliance.
Related Cross-References
More cross-references: vs ASTM A193 B16 · vs ASTM A193 B7 · vs ASTM A193 B8 · vs 21CrMoV5-11 · vs 24CrMoV5-5 · vs Durehete 1055 · vs 21HMF (Polish) · vs 42CrMo4. Back to the 21CrMoV5-7 Alloy Hub.
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