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 Polish PN 21HMF (PN-89/H-84030) (EN 10269 Cross-Reference)
21CrMoV5-7 (Werkstoff 1.7709) to EN 10269 is the direct equivalent of Polish PN 21HMF per Polish standard PN-89/H-84030. The 21HMF designation is widely used in Eastern European power-plant and turbine procurement (Polish, Czech, Slovak, Hungarian boiler and turbine bolting).
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At a Glance
| 21CrMoV5-7 (EN 10269) | 21HMF (PN-89/H-84030) | |
|---|---|---|
| Designation system | European Norm (EN) | Polish National Standard (PN) |
| Werkstoff | 1.7709 | (no Werkstoff — Polish numbering) |
| Procurement use | European-wide | Eastern European OEMs and PSEW (Polish power grid) |
| Service envelope | up to 550 deg C | up to 550 deg C |
Chemistry Comparison
| Element | 21CrMoV5-7 | 21HMF |
|---|---|---|
| C | 0.17 to 0.25 | 0.17 to 0.24 |
| Cr | 1.20 to 1.50 | 1.20 to 1.50 |
| Mo | 0.55 to 0.80 | 0.55 to 0.75 |
| V | 0.20 to 0.35 | 0.20 to 0.35 |
Mechanical Comparison
| Property | 21CrMoV5-7 | 21HMF |
|---|---|---|
| Tensile (Rm) | 700 to 850 MPa | 690 to 830 MPa |
| 0.2 percent proof (RT) | ≥550 MPa | ≥540 MPa |
| Service envelope | up to 550 deg C | up to 550 deg C |
When to Specify Which
Specify 21CrMoV5-7 for modern European procurement. Specify 21HMF when the Polish or Eastern European OEM drawing names the PN designation explicitly. The chemistry windows overlap fully — dual-certification covers both designations from the same heat.
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 does the Polish code 21HMF mean?
Polish bolting steel code: 21 = approximately 0.21 percent C; H = chromium (chrom); M = molybdenum (molibden); F = vanadium (wanad in Polish uses F prefix). Read as Cr-Mo-V bolting chemistry equivalent to EN 10269 21CrMoV5-7.
Q. Which Polish OEMs use the 21HMF designation?
Polish utility PGE, Polish boiler builders (Rafako, Foster Wheeler Energy Polska), turbine OEMs serving the Polish coal-power fleet. Czech and Slovak power-plant procurement also references 21HMF.
Q. Is 21HMF a current Polish standard?
PN-89/H-84030 is the controlling Polish standard, dating from 1989. Modern Polish procurement increasingly migrates to EN 10269 21CrMoV5-7 since Poland adopted the European norms after EU accession in 2004. Both designations remain valid.
Q. Can you supply 21HMF-certified material?
Yes. Dual-certification to EN 10269 21CrMoV5-7 and Polish PN 21HMF on call-out for projects in Poland, Czechia, Slovakia and Hungary.
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 20CDV5.7 (AFNOR) · vs 42CrMo4. Back to the 21CrMoV5-7 Alloy Hub.
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