Refractory Metal E110-SRA
Heat-treated state
EN E110
SRA = cold worked + stress-relief annealed
Pick when higher strength and creep resistance are needed and some ductility can be traded away.
Values for the SRA condition
Other E110 tempers and conditions
E110 is listed in 7 conditions; see the grade overview at E110.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
RXADefault Recrystallization annealed | Standard VVER fuel-cladding tube condition: maximum ductility and creep/corrosion stability. | 255 | 390 | 30 | 155 HB | 3.5 % IACS |
Sheet/Strip | Flat product for spacer grids, guide-tube flats and structural strip; annealed for stamping/forming. | 260 | 400 | 32 | 155 HB | 3.5 % IACS |
Sponge-based (low-Hf electrolytic replaced by sponge route), annealed | Same nominal chemistry but produced from Zr sponge with controlled impurities to remove the high-temperature 'breakaway' oxidation weakness of electrolytic E110. | 265 | 400 | 29 | 158 HB | 3.5 % IACS |
Β-quenched + final anneal | Beta-quench refines/uniformly distributes β-Nb precipitates for improved corrosion and irradiation-growth behaviour. | 280 | 420 | 27 | 165 HB | 3.4 % IACS |
Modified (raised O and Fe), annealed | Choose for higher-burnup / higher-duty cores: added O and Fe raise strength, creep and high-temperature steam-oxidation resistance. | 330 | 455 | 24 | 175 HB | 3.3 % IACS |
SRAThis page Cold worked + stress-relief annealed | Pick when higher strength and creep resistance are needed and some ductility can be traded away. | 400 | 510 | 15 | 190 HB | 3.4 % IACS |
Cold worked | Intermediate mill condition or where maximum strength is wanted; low ductility, high residual stress. | 520 | 600 | 8 | 20 HRC | 3.3 % IACS |
What is E110-SRA?
E110-SRA is E110 heat treated to SRA — pick when higher strength and creep resistance are needed and some ductility can be traded away. E110-SRA has a yield strength of 400 MPa (58 ksi) and a tensile strength of 510 MPa (74 ksi) — stronger than 63% of refractory metal grades. Elongation at break is 15% and the elastic modulus is 96 GPa (13.9 Msi). E110-SRA has a density of 6.55 g/cm³ (0.237 lb/in³), lighter than 77% of refractory metal grades. It melts at 1,850°C (3,362 °F). RXA is the default condition FabDigit quotes; SRA is available on request or by drawing note.
Advantages
- Lightweight — 6.55 g/cm³ (0.237 lb/in³), better than 77% of refractory metal grades
Limitations
- Low stiffness — 96 GPa (13.9 Msi), worse than 97% of refractory metal grades
- Limited service temperature — 380°C (716 °F), worse than 84% of refractory metal grades
E110-SRA properties
Typical room-temperature values for E110-SRA; 22 are specific to this condition. Other listed values are E110 reference data and may not represent this condition. Bars are the position among refractory metal grades.
Physical3
E110-SRA has a density of 6.55 g/cm³ (0.237 lb/in³), lighter than 77% of refractory metal grades. It melts at 1,850°C (3,362 °F).
Mechanical16
E110-SRA has a yield strength of 400 MPa (58 ksi) and a tensile strength of 510 MPa (74 ksi) — stronger than 63% of refractory metal grades. Elongation at break is 15% and the elastic modulus is 96 GPa (13.9 Msi).
Thermal6
E110-SRA is rated for continuous service to 380°C (716 °F). It conducts heat at 17.5 W/m·K (10.1 BTU/hr·ft·°F), worse than 72% of refractory metal grades. Thermal expansion is 5.8 µm/m·K (3.22 µin/in·°F).
Electrical3
E110-SRA conducts electricity at 3.4 % IACS, worse than 72% of refractory metal grades.
Chemical & Environmental3
Corrosion resistance is excellent (88/100), better than 64% of refractory metal grades.
Sustainability4
Producing a kilogram of E110-SRA takes about 1,400 MJ of energy and emits 90 kg of CO₂ — more than 67% of refractory metal grades. Typical recycled content is 15%.
Manufacturability8
E110-SRA's machinability is poor (30/100, better than 54% of refractory metal grades); weldability good (65/100); formability fair (50/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with E110-SRA
Is E110 easy to machine?
Use sharp carbide tools, slow speed / heavy feed, flood coolant and never let fine chips accumulate — Zr swarf is pyrophoric and the metal galls badly.
Can E110 be welded?
GTAW/EBW in a glove box, chamber or with full trailing and back purge (Ar/He); oxygen, nitrogen or moisture pickup causes immediate embrittlement.
Can E110 be formed, bent or molded?
Cold pilgering and drawing with intermediate vacuum anneals is the standard tube route; strong hcp texture makes properties directional, and sheet bends best across the rolling direction with generous radii.
What surface finishes work on E110?
Pickle in HNO3/HF then rinse thoroughly; nuclear parts get a steam/water autoclave pre-oxidation for a protective black oxide, and anodizing is available for non-nuclear decorative or wear films.
E110 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Nbprincipal alloying addition | 0.9 – 1.1 | 1 |
| OE110M targets the upper end (0.06–0.10) | 0.03 – 0.1 | 0.06 |
| FeE110M: 0.05–0.10 % deliberate addition | ≤ 0.05 | 0.02 |
| Hfnuclear grade, low neutron capture | ≤ 0.01 | 0.01 |
| C | ≤ 0.02 | 0.01 |
| N | ≤ 0.01 | 0 |
| Si | ≤ 0.02 | 0.01 |
| Ni | ≤ 0.02 | 0.01 |
| Al | ≤ 0.01 | 0 |
| Ti | ≤ 0.01 | 0 |
| Ca | ≤ 0.01 | 0 |
| Zr | balance | — |
E110-SRA — frequently asked
What is E110-SRA used for?
E110-SRA is typically used for VVER/RBMK fuel cladding, fuel channel tubes and reactor internals. In short: russian VVER cladding standard; low neutron absorption; best-forming Zr-1%Nb grade.
What is the yield strength of E110-SRA?
E110-SRA has a typical yield strength of 400 MPa (58 ksi) and a tensile strength of 510 MPa (74 ksi) — stronger than 63% of refractory metal grades. Strength varies by condition: see the 7 listed tempers.
Is E110-SRA easy to machine?
Not especially — machinability is rated poor (30/100, better than 54% of refractory metal grades). Use sharp carbide tools, slow speed / heavy feed, flood coolant and never let fine chips accumulate — Zr swarf is pyrophoric and the metal galls badly.
Can E110-SRA be welded?
Yes — weldability is rated good (65/100). GTAW/EBW in a glove box, chamber or with full trailing and back purge (Ar/He); oxygen, nitrogen or moisture pickup causes immediate embrittlement.
What surface finishes work on E110-SRA?
Pickle in HNO3/HF then rinse thoroughly; nuclear parts get a steam/water autoclave pre-oxidation for a protective black oxide, and anodizing is available for non-nuclear decorative or wear films.
Can E110-SRA be formed, bent or molded?
Cold pilgering and drawing with intermediate vacuum anneals is the standard tube route; strong hcp texture makes properties directional, and sheet bends best across the rolling direction with generous radii.
What is the maximum service temperature of E110-SRA?
E110-SRA is rated for continuous use to about 380°C (716 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between E110-RXA and E110-CW?
RXA is the default condition — standard VVER fuel-cladding tube condition: maximum ductility and creep/corrosion stability. CW: intermediate mill condition or where maximum strength is wanted; low ductility, high residual stress. Yield strength is 255 MPa in RXA versus 520 MPa in CW.
Sources
- Waterside Corrosion of Zirconium Alloys in Nuclear Power Plants (TECDOC-996) / Thermophysical Properties Database (TECDOC-1496) — IAEA (2006)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials (Zirconium section) — ASM International (1990)
- ASTM B350/B350M — Zirconium and Zirconium Alloy Ingots for Nuclear Application — ASTM International (2022)
- ASTM B811 — Wrought Zirconium Alloy Seamless Tubes for Nuclear Reactor Fuel Cladding — ASTM International (2021)
- Zr-1Nb (E110) fuel cladding tube product information — TVEL / Chepetsky Mechanical Plant (2020)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.