Refractory Metal O-30H HIP-SR
Heat-treated state
HIP-SR = hIP + stress relieved / thermally cycled
Pick for precision mirrors and metrology structures where micro-yield and long-term dimensional drift dominate; 730–790 °C vacuum anneal plus cryogenic cycling.
Values for the HIP-SR condition
Other O-30H tempers and conditions
O-30H is listed in 2 conditions; see the grade overview at O-30H.
- HIP-SR
- HIP
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
HIP-SRThis page HIP + stress relieved / thermally cycled | Pick for precision mirrors and metrology structures where micro-yield and long-term dimensional drift dominate; 730–790 °C vacuum anneal plus cryogenic cycling. | 190 | 300 | 3.5 | 130 HB | 42 % IACS |
HIPDefault Hot isostatic pressed | Standard supplied condition: fully dense, isotropic HIP billet or near-net blank for mirror substrates. | 207 | 324 | 3 | 140 HB | 42 % IACS |
What is O-30H HIP-SR?
O-30H HIP-SR is O-30H heat treated to HIP-SR — pick for precision mirrors and metrology structures where micro-yield and long-term dimensional drift dominate; 730–790 °C vacuum anneal plus cryogenic cycling. O-30H HIP-SR has a yield strength of 190 MPa (27.6 ksi) and a tensile strength of 300 MPa (43.5 ksi) — weaker than 91% of refractory metal grades. Elongation at break is 3.5% and the elastic modulus is 303 GPa (43.9 Msi). O-30H HIP-SR has a density of 1.85 g/cm³ (0.0668 lb/in³), lighter than 96% of refractory metal grades. It melts at 1,287°C (2,349 °F). HIP is the default condition FabDigit quotes; HIP-SR is available on request or by drawing note.
Advantages
- Polishes to a fine finish — 85/100, better than 100% of refractory metal grades
- Conducts heat well — 216 W/m·K (124.8 BTU/hr·ft·°F), better than 99% of refractory metal grades
- High electrical conductivity — 42 % IACS, better than 99% of refractory metal grades
- Lightweight — 1.85 g/cm³ (0.0668 lb/in³), better than 96% of refractory metal grades
Limitations
- Needs corrosion protection — 42/100, worse than 95% of refractory metal grades
- Difficult to weld — 15/100, worse than 93% of refractory metal grades
- Low fracture toughness — 11 MPa·√m (10 ksi·√in), worse than 92% of refractory metal grades
- Low strength — 190 MPa (27.6 ksi), worse than 91% of refractory metal grades
- Limited formability — 10/100, worse than 86% of refractory metal grades
O-30H HIP-SR properties
Typical room-temperature values for O-30H HIP-SR; 23 are specific to this condition. Other listed values are O-30H reference data and may not represent this condition. Bars are the position among refractory metal grades.
Physical3
O-30H HIP-SR has a density of 1.85 g/cm³ (0.0668 lb/in³), lighter than 96% of refractory metal grades. It melts at 1,287°C (2,349 °F).
Mechanical16
O-30H HIP-SR has a yield strength of 190 MPa (27.6 ksi) and a tensile strength of 300 MPa (43.5 ksi) — weaker than 91% of refractory metal grades. Elongation at break is 3.5% and the elastic modulus is 303 GPa (43.9 Msi).
Thermal6
O-30H HIP-SR is rated for continuous service to 500°C (932 °F). It conducts heat at 216 W/m·K (124.8 BTU/hr·ft·°F), better than 99% of refractory metal grades. Thermal expansion is 11.3 µm/m·K (6.28 µin/in·°F).
Electrical3
O-30H HIP-SR conducts electricity at 42 % IACS, better than 99% of refractory metal grades.
Chemical & Environmental3
Corrosion resistance is fair (42/100), worse than 95% of refractory metal grades.
Sustainability4
Producing a kilogram of O-30H HIP-SR takes about 1,500 MJ of energy and emits 95 kg of CO₂ — more than 77% of refractory metal grades. Typical recycled content is 10%.
Manufacturability7
O-30H HIP-SR's machinability is fair (38/100, better than 90% of refractory metal grades); weldability poor (15/100); formability not recommended (10/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with O-30H HIP-SR
Is O-30H easy to machine?
Machine only in enclosed wet/HEPA-controlled cells with sharp carbide or diamond tooling, light depth of cut and no dwell; finish machining must be followed by acid etch to remove the twinned, microcracked surface layer.
Can O-30H be welded?
Essentially not fusion welded for optics — electron-beam welding is possible but hot-crack prone; joints are normally Al–Si brazed, diffusion bonded or mechanically fastened with insulated interfaces.
Can O-30H be formed, bent or molded?
No cold forming; parts are produced near-net by HIP into shaped cans or by machining billet, with warm working (>400 °C) only for special mill products.
What surface finishes work on O-30H?
Acid etch, then electroless nickel or CVD/PVD SiO₂-Al coating for polishing to optical figure; never anodize, and protect bare Be from chloride humidity to avoid pitting.
O-30H 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 |
|---|---|---|
| BeOlow oxide content for optical isotropy and low microyield | ≤ 0.5 | 0.4 |
| Fe | ≤ 0.1 | 0.06 |
| Al | ≤ 0.07 | 0.04 |
| Mg | ≤ 0.07 | 0.03 |
| Si | ≤ 0.07 | 0.03 |
| C | ≤ 0.07 | 0.05 |
| other metallic, each | ≤ 0.04 | — |
| Beberyllium assay, wt % (BeO excluded) | ≥ 99 (balance) | — |
O-30H HIP-SR — frequently asked
What is O-30H HIP-SR used for?
O-30H HIP-SR is typically used for telescope mirrors, laser mirror substrates and reflective optics. In short: optical-grade beryllium; isotropic HIP microstructure; best polishability in family.
What is the yield strength of O-30H HIP-SR?
O-30H HIP-SR has a typical yield strength of 190 MPa (27.6 ksi) and a tensile strength of 300 MPa (43.5 ksi) — weaker than 91% of refractory metal grades. Strength varies by condition: see the 2 listed tempers.
Is O-30H HIP-SR easy to machine?
Not especially — machinability is rated fair (38/100, better than 90% of refractory metal grades). Machine only in enclosed wet/HEPA-controlled cells with sharp carbide or diamond tooling, light depth of cut and no dwell; finish machining must be followed by acid etch to remove the twinned, microcracked surface layer.
Can O-30H HIP-SR be welded?
Not readily — weldability is rated poor (15/100). Essentially not fusion welded for optics — electron-beam welding is possible but hot-crack prone; joints are normally Al–Si brazed, diffusion bonded or mechanically fastened with insulated interfaces.
What surface finishes work on O-30H HIP-SR?
Acid etch, then electroless nickel or CVD/PVD SiO₂-Al coating for polishing to optical figure; never anodize, and protect bare Be from chloride humidity to avoid pitting.
Can O-30H HIP-SR be formed, bent or molded?
No cold forming; parts are produced near-net by HIP into shaped cans or by machining billet, with warm working (>400 °C) only for special mill products.
What is the maximum service temperature of O-30H HIP-SR?
O-30H HIP-SR is rated for continuous use to about 500°C (932 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between O-30H-HIP and O-30H HIP-SR?
HIP is the default condition — standard supplied condition: fully dense, isotropic HIP billet or near-net blank for mirror substrates. HIP-SR: pick for precision mirrors and metrology structures where micro-yield and long-term dimensional drift dominate; 730–790 °C vacuum anneal plus cryogenic cycling. Yield strength is 207 MPa in HIP versus 190 MPa in HIP-SR.
Sources
- Optical-grade beryllium (O-30 / O-30H) product data — Materion Beryllium & Composites (2021)
- ASM Handbook Vol. 2: Properties and Selection — Nonferrous Alloys, Beryllium section — ASM International (1990)
- ASTM B(hot-pressed/HIP beryllium block specifications, e.g. B776/B783 family) — ASTM International (2019)
- Beryllium Optical Materials and Mirror Fabrication reviews (SPIE proceedings) — SPIE (2010)
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.