Titanium SP-700
SP-700 is an alpha-beta titanium alloy developed in Japan that offers higher strength and a lower superplastic forming temperature than Ti-6Al-4V.
Reference datasheet — SP-700 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the Annealed condition
SP-700 tempers and conditions
SP-700 is supplied in 6 conditions, soft to hard. Annealed is the default FabDigit quotes; the values on this page are for it.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution annealed | Metastable-β rich, softest and most formable state; form or head parts here then age to final strength. | 790 | 900 | 20 | 30 HRC | 1 % IACS |
AnnealedDefault mill annealed sheet/plate/bar (fine-grained) | Standard stocked condition; fine equiaxed grain for superplastic forming and best cold formability. | 860 | 930 | 17 | 32 HRC | — |
As-welded (GTAW/EBW joint, inert shielding, no PWHT) | Reference condition for weld joints; strength near annealed base metal but reduced ductility — stress relief recommended. | 870 | 930 | 8 | 34 HRC | 1 % IACS |
annealed above β transus (≈900 °C) and cooled | Use when damage tolerance / fracture toughness matters more than ductility (thick plate, forgings). | 880 | 960 | 10 | 33 HRC | 7 W/m·K |
Cold rolled | Cold-worked strip and wire where springback and higher as-supplied strength are wanted; limited remaining ductility. | 1,010 | 1,080 | 8 | 36 HRC | 1 % IACS |
Solution treated and aged | Choose for maximum strength in fasteners, springs and thick sections — SP-700 hardens through much heavier sections than Ti-6Al-4V. | 1,150 | 1,250 | 10 | 39 HRC | — |
Supply forms, finishes and certifications
Ways SP-700 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
SPF | As superplastically formed (750–800 °C) and air cooled | Surface finish |
What is SP-700?
SP-700 is an alpha-beta titanium alloy developed in Japan that offers higher strength and a lower superplastic forming temperature than Ti-6Al-4V. Annealed sheet, plate and bar give about 860 MPa yield, 930 MPa tensile, 17% elongation, 32 HRC and 112 GPa modulus; the alloy is specified for superplastically formed and diffusion-bonded sheet structures processed at 750–800 °C, roughly 100 °C below Ti-6Al-4V. Limits are a service ceiling near 350 °C, poor machinability and restricted mill availability, with Ti-6Al-4V the default substitute where SPF/DB is not required. SP-700 has a density of 4.54 g/cm³ (0.164 lb/in³), heavier than 80% of titanium grades. It melts at 1,590°C (2,894 °F). SP-700 has a yield strength of 860 MPa (125 ksi) and a tensile strength of 930 MPa (135 ksi) — stronger than 71% of titanium grades. Elongation at break is 17% and the elastic modulus is 112 GPa (16.2 Msi).
What is SP-700 used for?
- superplastic-formed aerospace panels
- golf club heads
- biomedical devices
Limitations
- Low electrical conductivity — 1 % IACS, worse than 89% of titanium grades
- Difficult to weld — 65/100, worse than 77% of titanium grades
SP-700 properties
Typical room-temperature values for SP-700-Annealed; bars are the position among titanium grades.
Physical3
SP-700 has a density of 4.54 g/cm³ (0.164 lb/in³), heavier than 80% of titanium grades. It melts at 1,590°C (2,894 °F).
Mechanical16
SP-700 has a yield strength of 860 MPa (125 ksi) and a tensile strength of 930 MPa (135 ksi) — stronger than 71% of titanium grades. Elongation at break is 17% and the elastic modulus is 112 GPa (16.2 Msi).
Thermal6
SP-700 is rated for continuous service to 350°C (662 °F). It conducts heat at 7 W/m·K (4.04 BTU/hr·ft·°F), worse than 76% of titanium grades. Thermal expansion is 9.4 µm/m·K (5.22 µin/in·°F).
Electrical3
SP-700 conducts electricity at 1 % IACS, worse than 89% of titanium grades.
Chemical & Environmental3
Corrosion resistance is excellent (88/100), worse than 77% of titanium grades.
Sustainability4
Producing a kilogram of SP-700 takes about 650 MJ of energy and emits 42 kg of CO₂ — less than 75% of titanium grades. Typical recycled content is 25%.
Manufacturability8
SP-700's machinability is poor (20/100, worse than 68% of titanium grades); weldability good (65/100); formability fair (45/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the titanium family
Yield strength against density for every titanium grade FabDigit runs. SP-700 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with SP-700
Is SP-700 easy to machine?
Machine like Ti-6Al-4V but harder in STA: low surface speed (20–35 m/min carbide), heavy positive rake, rigid setup, flood high-pressure coolant, never dwell — chips are pyrophoric.
Can SP-700 be welded?
GTAW, plasma, laser and electron-beam weld well with full argon/vacuum shielding and clean joints; diffusion bonding is a designed-in capability, no filler needed for SPF/DB panels.
Can SP-700 be formed, bent or molded?
Superplastic at 750–800 °C with m ≈ 0.5 and >500 % elongation (about 100 °C below Ti-6Al-4V); cold bending is possible at larger radii than Ti-6Al-4V, hot form/size otherwise, then age.
SP-700 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 |
|---|---|---|
| Alα stabilizer | 4 – 5 | 4.5 |
| Vβ stabilizer | 2.5 – 3.5 | 3 |
| Moβ stabilizer | 1.7 – 2.3 | 2 |
| Festrong β stabilizer, lowers β transus | 1.7 – 2.3 | 2 |
| Ointerstitial, controlled low for superplasticity | ≤ 0.15 | 0.1 |
| C | ≤ 0.05 | |
| N | ≤ 0.03 | |
| H | ≤ 0.02 | |
| Tibalance, ≈88.5 % | balance |
What surface finishes work on SP-700?
Pickle in HNO₃/HF to remove alpha case after hot work, then bead blast, polish or Type II colour anodize; avoid chlorinated cleaners and cadmium/mercury contact.
Surface treatments FabDigit runs on titanium parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Thermal Spray
How much does SP-700 cost?
SP-700 is a high-cost titanium ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
SP-700 — frequently asked
What is SP-700 used for?
SP-700 is typically used for superplastic-formed aerospace panels, golf club heads and biomedical devices. In short: lowest SPF temperature titanium; stronger than Ti-6Al-4V; diffusion-bonding capable sheet.
What is the yield strength of SP-700?
SP-700 has a typical yield strength of 860 MPa (125 ksi) and a tensile strength of 930 MPa (135 ksi) — stronger than 71% of titanium grades. Strength varies by condition: see the 6 listed tempers.
Is SP-700 easy to machine?
Not especially — machinability is rated poor (20/100, worse than 68% of titanium grades). Machine like Ti-6Al-4V but harder in STA: low surface speed (20–35 m/min carbide), heavy positive rake, rigid setup, flood high-pressure coolant, never dwell — chips are pyrophoric.
Can SP-700 be welded?
Yes — weldability is rated good (65/100). GTAW, plasma, laser and electron-beam weld well with full argon/vacuum shielding and clean joints; diffusion bonding is a designed-in capability, no filler needed for SPF/DB panels.
What surface finishes work on SP-700?
Pickle in HNO₃/HF to remove alpha case after hot work, then bead blast, polish or Type II colour anodize; avoid chlorinated cleaners and cadmium/mercury contact.
Can SP-700 be formed, bent or molded?
Superplastic at 750–800 °C with m ≈ 0.5 and >500 % elongation (about 100 °C below Ti-6Al-4V); cold bending is possible at larger radii than Ti-6Al-4V, hot form/size otherwise, then age.
What is the maximum service temperature of SP-700?
SP-700 is rated for continuous use to about 350°C (662 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between SP-700 Annealed and SP-700-STA?
Annealed is the default condition — standard stocked condition; fine equiaxed grain for superplastic forming and best cold formability. STA: choose for maximum strength in fasteners, springs and thick sections — SP-700 hardens through much heavier sections than Ti-6Al-4V. Yield strength is 860 MPa in Annealed versus 1,150 MPa in STA.
How much does SP-700 cost?
SP-700 is a high-cost titanium ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- SP-700 High-Strength Superplastic Titanium Alloy — NKK / JFE Steel (1997)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- Materials Properties Handbook: Titanium Alloys — ASM International (1994)
- ASM Handbook Vol. 13B — Corrosion: Materials — ASM International (2005)
- Titanium alloy property records (α-β class) — MatWeb / CES EduPack (2023)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.