Titanium Ti Grade 19
UNS R58640 · also Beta C
Ti Grade 19 (UNS R58640, ASTM B265/B348), also known as Beta C, is a metastable beta titanium alloy that is heat-treatable to very high strength yet remains cold formable in the solution-treated condition.
Reference datasheet — Ti Grade 19 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 ST condition
Ti Grade 19 tempers and conditions
Ti Grade 19 is supplied in 4 conditions, soft to hard. ST is the default FabDigit quotes; the values on this page are for it.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
STDefault Solution annealed | Pick for cold forming, coiling of springs, deep drawing or machining before a final aging cycle. | 860 | 930 | 18 | 30 HRC | — |
STA | Pick when 1100–1200 MPa with useful ductility, toughness and SCC resistance is preferred over peak strength. | 1,120 | 1,180 | 10 | 38 HRC | — |
STA | Pick for maximum strength fasteners, springs and downhole tools where ductility and toughness can be traded away. | 1,240 | 1,310 | 6 | 43 HRC | — |
Cold drawn (solution treated) then aged, spring wire condition | Pick for coil and torsion springs: cold drawing before aging raises strength above conventional STA at equal ductility. | 1,330 | 1,400 | 6 | 45 HRC | — |
What is Ti Grade 19?
Ti Grade 19 (UNS R58640, ASTM B265/B348), also known as Beta C, is a metastable beta titanium alloy that is heat-treatable to very high strength yet remains cold formable in the solution-treated condition. It is used for fasteners, springs and highly loaded fittings, and is available as bar, wire, coil, sheet and tube in ST, STA-H, STA-M and CD+A conditions. Typical values are 860 MPa yield, 930 MPa tensile, 18% elongation, 30 HRC and a low 96 GPa modulus, with service to 260 °C. Machinability is 20/100 and welding requires re-heat treatment; Grade 20 is the choice when crevice-corrosion resistance must be higher. Ti Grade 19 has a density of 4.82 g/cm³ (0.174 lb/in³), heavier than 94% of titanium grades. It melts at 1,600°C (2,912 °F). Ti Grade 19 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 18% and the elastic modulus is 96 GPa (13.9 Msi).
What is Ti Grade 19 used for?
- aerospace fasteners and springs
- landing gear components
- high-strength structural parts
Advantages
- Tough — resists crack growth — 85 MPa·√m (77.4 ksi·√in), better than 91% of titanium grades
Limitations
- Limited service temperature — 260°C (500 °F), worse than 97% of titanium grades
- Difficult to weld — 65/100, worse than 77% of titanium grades
Ti Grade 19 properties
Typical room-temperature values for Ti Grade 19-ST; bars are the position among titanium grades.
Physical3
Ti Grade 19 has a density of 4.82 g/cm³ (0.174 lb/in³), heavier than 94% of titanium grades. It melts at 1,600°C (2,912 °F).
Mechanical16
Ti Grade 19 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 18% and the elastic modulus is 96 GPa (13.9 Msi).
Thermal6
Ti Grade 19 is rated for continuous service to 260°C (500 °F). It conducts heat at 7.6 W/m·K (4.39 BTU/hr·ft·°F), worse than 59% of titanium grades. Thermal expansion is 9 µm/m·K (5 µin/in·°F).
Electrical3
Ti Grade 19 conducts electricity at 1.1 % IACS, worse than 67% of titanium grades.
Chemical & Environmental3
Corrosion resistance is excellent (88/100), worse than 77% of titanium grades.
Sustainability4
Producing a kilogram of Ti Grade 19 takes about 700 MJ of energy and emits 45 kg of CO₂ — more than 74% of titanium grades. Typical recycled content is 30%.
Manufacturability8
Ti Grade 19's machinability is poor (20/100, worse than 68% of titanium grades); weldability good (65/100); formability very good (70/100).
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. Ti Grade 19 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Ti Grade 19
Is Ti Grade 19 easy to machine?
Machine with rigid setups, sharp uncoated-carbide or PVD-coated tools, low surface speed (15–30 m/min aged), heavy feed and flood high-pressure coolant; never dwell, and machine in the solution-treated state where possible.
Can Ti Grade 19 be welded?
GTAW/plasma/EB weld with full inert-gas or vacuum shielding and matching filler; welds are soft as-welded and should be re-solution treated and aged to restore strength.
Can Ti Grade 19 be formed, bent or molded?
Cold form, coil, bend and draw in the solution-treated condition (springback is high, allow generous overbend), then age to final strength; hot work above the ~730–760 °C beta transus.
Ti Grade 19 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 |
|---|---|---|
| Al | 3 – 4 | 3.5 |
| V | 7.5 – 8.5 | 8 |
| Cr | 5.5 – 6.5 | 6 |
| Mo | 3.5 – 4.5 | 4 |
| Zr | 3.5 – 4.5 | 4 |
| Fe | ≤ 0.3 | |
| O | ≤ 0.14 | |
| C | ≤ 0.05 | |
| N | ≤ 0.03 | |
| Hmax, bar/billet | ≤ 0.02 | |
| Other, eachresiduals, each | ≤ 0.1 | |
| Other, totalresiduals, total | ≤ 0.4 | |
| Ti | balance |
What surface finishes work on Ti Grade 19?
Pickle in HNO₃/HF or grit-blast plus chemical clean to remove alpha case; color anodize per AMS 2488 Type II, or apply dry-film lube/anti-gall coatings for threaded parts.
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
Equivalent designations
Standards and trade names that resolve to Titanium Ti Grade 19 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- R58640
- Trade names
- Beta C
- Also called
- Ti-3Al-8V-6Cr-4Zr-4Mo
How much does Ti Grade 19 cost?
Ti Grade 19 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.
Ti Grade 19 — frequently asked
What is Ti Grade 19 used for?
Ti Grade 19 is typically used for aerospace fasteners and springs, landing gear components and high-strength structural parts. In short: heat-treatable beta titanium; cold formable then aged; low modulus spring alloy.
What is the yield strength of Ti Grade 19?
Ti Grade 19 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 4 listed tempers.
Is Ti Grade 19 easy to machine?
Not especially — machinability is rated poor (20/100, worse than 68% of titanium grades). Machine with rigid setups, sharp uncoated-carbide or PVD-coated tools, low surface speed (15–30 m/min aged), heavy feed and flood high-pressure coolant; never dwell, and machine in the solution-treated state where possible.
Can Ti Grade 19 be welded?
Yes — weldability is rated good (65/100). GTAW/plasma/EB weld with full inert-gas or vacuum shielding and matching filler; welds are soft as-welded and should be re-solution treated and aged to restore strength.
What surface finishes work on Ti Grade 19?
Pickle in HNO₃/HF or grit-blast plus chemical clean to remove alpha case; color anodize per AMS 2488 Type II, or apply dry-film lube/anti-gall coatings for threaded parts.
Can Ti Grade 19 be formed, bent or molded?
Cold form, coil, bend and draw in the solution-treated condition (springback is high, allow generous overbend), then age to final strength; hot work above the ~730–760 °C beta transus.
What is the maximum service temperature of Ti Grade 19?
Ti Grade 19 is rated for continuous use to about 260°C (500 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Ti Grade 19-ST and Ti Grade 19 STA-H?
ST is the default condition — pick for cold forming, coiling of springs, deep drawing or machining before a final aging cycle. STA-H: pick for maximum strength fasteners, springs and downhole tools where ductility and toughness can be traded away. Yield strength is 860 MPa in ST versus 1,240 MPa in STA-H.
How much does Ti Grade 19 cost?
Ti Grade 19 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
- ASTM B348 / B348M — Titanium and Titanium Alloy Bars and Billets (Grade 19) — ASTM International (2021)
- ASTM B265 — Titanium and Titanium Alloy Strip, Sheet and Plate — ASTM International (2020)
- AMS 4957 / AMS 4958 — Ti-3Al-8V-6Cr-4Mo-4Zr bar and wire — SAE International (2018)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- Materials Properties Handbook: Titanium Alloys — ASM International (1994)
- Beta C (Ti-3Al-8V-6Cr-4Mo-4Zr) alloy datasheet — RMI Titanium / TIMET (2015)
- GB/T 2965 (TB9) — SAC (2007)
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.