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EN 10269 Standard for Bolting Steels (Elevated-Temperature Fasteners)
EN 10269 is the European Norm that governs steels and nickel alloys for fasteners with specified elevated-temperature and low-temperature properties. The standard is the controlling spec for the 21CrMoV5-7 (Werkstoff 1.7709) Cr-Mo-V bolting steel and for the wider creep-resistant bolting family used in steam turbine casings, gas turbine compressor flanges, pressure vessels under VdTUV Wb 350, and refinery fired-heater flange studs. The current edition is EN 10269:2013 + A1:2024.
Scope of EN 10269
EN 10269 specifies technical delivery conditions for bars, wire rod, semi-finished products, forgings and finished fasteners (bolts, screws, studs, nuts, washers) intended for service at elevated temperature, low temperature, or both. The standard governs chemistry ranges, heat-treatment condition, mechanical-property floors at room temperature and at the design metal temperature, 100,000-hour stress-rupture envelope in Annex A, inspection categories to EN 10204, and product marking.
Grade Matrix Relevant to 21CrMoV5-7
| Grade | Werkstoff | Service envelope | Use case |
|---|---|---|---|
| 21CrMoV5-7 | 1.7709 | up to 550 deg C | Workhorse Cr-Mo-V Q+T bolting |
| 21CrMoV5-11 | 1.8070 | up to 550 deg C | Heavier-section variant of 5-7 |
| 24CrMoV5-5 | 1.7733 | up to 500 deg C | Lower-temp adjacent grade |
| 20CrMoVTiB4-10 (Durehete 1055) | 1.7729 | up to 568 deg C | Premium Ti+B microalloyed |
| 40CrMoV4-6 (Durehete 950) | 1.7711 | up to 540 deg C | Mid-tier ASTM A193 B16 cousin |
| 42CrMoV5-6 (Durehete 900) | 1.7733 family | up to 480 deg C | Lower-temp workhorse |
21CrMoV5-7 Chemistry to EN 10269
Detailed element-by-element ranges for 21CrMoV5-7 are on the dedicated chemical composition page. Headline: C 0.17 to 0.25, Cr 1.20 to 1.50, Mo 0.55 to 0.80, V 0.20 to 0.35 with vanadium-driven secondary hardening as the creep-resistance driver.
Mechanical-Property Floor (EN 10269)
Room-temperature 0.2 percent proof stress at least 550 MPa, tensile strength 700 to 850 MPa, elongation A5 at least 16 percent, Charpy V impact at least 63 J at 20 deg C. Elevated-temperature 0.2 percent proof at 500 deg C at least 450 MPa. Full table on the mechanical properties page.
Inspection Categories to EN 10204
EN 10269 references the inspection-document categories defined in EN 10204: type 2.1 declaration of compliance, type 2.2 test report, type 3.1 mill test certificate (issued by the manufacturer with heat-level traceability), and type 3.2 inspection certificate (witnessed by Lloyd's Register, DNV, BV, SGS or TUV). Type 3.1 is the TorqBolt default; type 3.2 is standard practice for turbine and pressure-vessel procurement.
Cross-References to Other Standards
EN 10269 cross-references are catalogued on the EN 10269 equivalents page. Headline mappings: ASTM A193 Grade B16 (closest US cousin to 21CrMoV5-7); AFNOR 20CDV5.7 (French); Polish PN 21HMF; DIN EN 10269 and BS EN 10269 (German and British national variants of the same European Norm).
Latest Revision: EN 10269:2013 + A1:2024
The 2024 amendment refreshes the elevated-temperature data tables in Annex A and the inspection cross-references to the latest EN 10204 edition. DIN EN 10269 and BS EN 10269 are national variants with the same technical content. EN 10278 is the companion standard for cold-drawn bright steel bars, which applies to drawn 21CrMoV5-7 bar stock.
Frequently Asked Questions
Q. What does EN 10269 specify?
EN 10269 specifies the technical delivery conditions for steels and nickel alloys used in bolts, nuts, studs, screws and washers intended for service at elevated temperature, low temperature, or both.
Q. What is the latest revision of EN 10269?
EN 10269:2013 with Amendment A1:2024. The 2024 amendment refreshes the elevated-temperature data tables and the inspection category cross-references.
Q. Where does 21CrMoV5-7 sit within the EN 10269 grade matrix?
21CrMoV5-7 (Werkstoff 1.7709) is the workhorse mid-tier Cr-Mo-V Q+T bolting steel for service to 550 deg C. Sister grade 21CrMoV5-11 covers heavier sections; for service above 550 deg C the family steps up to Durehete 1055 (Alloy T41 / 1.7729).
Q. What is the ASTM equivalent of EN 10269?
The closest US analog is ASTM A193 for high-temperature bolting and ASTM A194 for matched nuts. Grade-level: 21CrMoV5-7 to ASTM A193 Grade B16.
Q. Do you supply EN 10269 material with type 3.2 certification?
Yes. Type 3.1 by default; type 3.2 with Lloyd's, DNV, BV, SGS or TUV witness on call-out and standard practice for turbine procurement.
Related Standards and Properties
Related standards: EN 10278 (cold-drawn bar) · VdTUV Wb 350 · ASTM A193 · EN 10269 Equivalents. Properties pages: Chemistry · Mechanicals · Heat Treatment · Hardness · Creep-Rupture. Back to the 21CrMoV5-7 Alloy Hub.
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