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 21CrMoV5-11 (Werkstoff 1.8070) (EN 10269 Cross-Reference)
21CrMoV5-7 (Werkstoff 1.7709) and 21CrMoV5-11 (Werkstoff 1.8070) are sister grades in EN 10269 with overlapping Cr range but different Mo target. 21CrMoV5-7 has Mo 0.55 to 0.80 percent; 21CrMoV5-11 has Mo 0.90 to 1.10 percent. The higher Mo content of 5-11 gives extended through-thickness hardenability for heavier sections without changing the alloy class.
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At a Glance
| 21CrMoV5-7 | 21CrMoV5-11 | |
|---|---|---|
| Werkstoff number | 1.7709 | 1.8070 |
| Standard | EN 10269 | EN 10269 |
| Service envelope | up to 550 deg C | up to 550 deg C |
| Hardenability | Standard (OD up to 200 mm) | Extended (OD up to 800 mm) |
| Use case | Workhorse mid-section bolting | Heavy-section forgings and large studs |
Chemistry Comparison
| Element | 21CrMoV5-7 | 21CrMoV5-11 |
|---|---|---|
| C | 0.17 to 0.25 | 0.17 to 0.25 |
| Mn | 0.40 to 0.80 | 0.40 to 0.80 |
| Cr | 1.20 to 1.50 | 1.20 to 1.50 |
| Mo | 0.55 to 0.80 | 0.90 to 1.10 |
| V | 0.20 to 0.35 | 0.25 to 0.35 |
Mechanical Comparison
| Property | 21CrMoV5-7 | 21CrMoV5-11 |
|---|---|---|
| Tensile (Rm) | 700 to 850 MPa | 700 to 850 MPa |
| 0.2 percent proof (RT) | ≥550 MPa | ≥550 MPa |
| Effective hardenability | OD up to 200 mm Q+T | OD up to 800 mm Q+T |
When to Specify Which
Specify 21CrMoV5-7 for stud bolts, hex bolts and bar diameters up to OD 200 mm where standard hardenability is sufficient. Specify 21CrMoV5-11 for heavy-section forgings (OD 200 to 800 mm) and large-diameter tap studs where through-thickness Q+T transformation is needed to maintain mechanical-property floor at the centre of the section.
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. What is the practical difference between 5-7 and 5-11?
The higher Mo content of 5-11 extends through-thickness hardenability so that thicker sections fully transform to bainite during the oil quench. For OD up to 200 mm fully-hardened, both grades work; above 200 mm 5-11 is preferred.
Q. Are the mechanical-property floors the same?
Yes. Both grades have identical Rp0.2 (>=550 MPa), Rm (700 to 850 MPa), elongation (>=16 percent) and Charpy V impact (>=63 J) floors to EN 10269. The chemistry difference shows up in the maximum effective section thickness.
Q. Is 21CrMoV5-11 more expensive than 21CrMoV5-7?
Slightly. The higher Mo content costs more per kg of finished material. For sections where 5-7 is adequate, 5-7 is the cost choice. Above OD 200 mm, 5-11 is the only option for fully-hardened delivery.
Q. Do you supply both grades from the same mill?
Yes. The bar mills that supply 21CrMoV5-7 also supply 21CrMoV5-11 (BGH, Boden, Rodacciai, Virgamet). Dual-source on call-out for project consolidation.
Related Cross-References
More cross-references: vs ASTM A193 B16 · vs ASTM A193 B7 · vs ASTM A193 B8 · vs 24CrMoV5-5 · vs Durehete 1055 · vs 20CDV5.7 (AFNOR) · vs 21HMF (Polish) · vs 42CrMo4. Back to the 21CrMoV5-7 Alloy Hub.
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