Specifications
Surface Treatments
Certifications
- ISO 9001 - 2015 Certified
- PED 2014/68/EC
- NACE MR0175/ISO 15156-2
- NORSOK M-650
- DFAR
- MERKBLATT AD 2000 W2/W7/W10
21CrMoV5-7 vs 24CrMoV5-5 (Werkstoff 1.7733) (EN 10269 Cross-Reference)
21CrMoV5-7 (Werkstoff 1.7709) and 24CrMoV5-5 (Werkstoff 1.7733) are adjacent grades in EN 10269. 24CrMoV5-5 has higher carbon (0.20 to 0.28) and lower Cr (0.90 to 1.20) than 21CrMoV5-7. The differences set the service envelope: 24CrMoV5-5 caps at ~500 deg C (lower V content limits long-term creep), while 21CrMoV5-7 holds to 550 deg C.
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At a Glance
| 21CrMoV5-7 | 24CrMoV5-5 | |
|---|---|---|
| Werkstoff number | 1.7709 | 1.7733 |
| Standard | EN 10269 | EN 10269 |
| Service envelope | up to 550 deg C | up to 500 deg C |
| Use case | Workhorse mid-tier | Lower-temp Cr-Mo-V cousin |
Chemistry Comparison
| Element | 21CrMoV5-7 | 24CrMoV5-5 |
|---|---|---|
| C | 0.17 to 0.25 | 0.20 to 0.28 |
| Cr | 1.20 to 1.50 | 0.90 to 1.20 |
| Mo | 0.55 to 0.80 | 0.50 to 0.70 |
| V | 0.20 to 0.35 | 0.20 to 0.30 |
Mechanical Comparison
| Property | 21CrMoV5-7 | 24CrMoV5-5 |
|---|---|---|
| Tensile (Rm) | 700 to 850 MPa | 700 to 850 MPa |
| 0.2 percent proof (RT) | ≥550 MPa | ≥530 MPa |
| Max service temp | 550 deg C | 500 deg C |
When to Specify Which
Specify 21CrMoV5-7 when service approaches 550 deg C and design margin matters. Specify 24CrMoV5-5 for service up to 500 deg C where the slightly cheaper chemistry profile is acceptable. 24CrMoV5-5 is most often encountered on legacy mid-twentieth-century power plants and on retrofit work where the original procurement called out 24CrMoV5-5 by name.
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. Which is the more modern grade, 21CrMoV5-7 or 24CrMoV5-5?
21CrMoV5-7 is the more modern workhorse with higher Cr content for better through-thickness hardenability. 24CrMoV5-5 dates from earlier German bolting practice and is encountered on legacy power-plant retrofit work.
Q. Can 21CrMoV5-7 substitute for 24CrMoV5-5?
Yes, almost always. 21CrMoV5-7 has the same or better mechanical-property floors and a higher service envelope. The only case where 24CrMoV5-5 must be specified is when the original procurement document (often legacy turbine OEM drawings) names 24CrMoV5-5 explicitly.
Q. What is the chemistry difference in summary?
24CrMoV5-5 has higher C (0.20 to 0.28 vs 0.17 to 0.25), lower Cr (0.90 to 1.20 vs 1.20 to 1.50), and tighter V max (0.30 vs 0.35). The lower Cr is the main hardenability difference.
Q. Do you stock 24CrMoV5-5?
Not as standard stock. Available on call-out from the same mills that supply 21CrMoV5-7 (BGH, Boden, Virgamet) on minimum-order quantity. For retrofit projects, contact early to confirm lead time.
Related Cross-References
More cross-references: vs ASTM A193 B16 · vs ASTM A193 B7 · vs ASTM A193 B8 · vs 21CrMoV5-11 · vs Durehete 1055 · vs 20CDV5.7 (AFNOR) · vs 21HMF (Polish) · vs 42CrMo4. Back to the 21CrMoV5-7 Alloy Hub.
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