Titanium Ti Grade 19-ST (Solution annealed)
Heat-treated state · default condition
UNS R58640 · also Beta C
Pick for cold forming, coiling of springs, deep drawing or machining before a final aging cycle.
Values for the ST condition
Other Ti Grade 19 tempers and conditions
Ti Grade 19 is listed in 4 conditions; see the grade overview at Ti Grade 19.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
STDefaultThis page 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-ST?
Ti Grade 19-ST is Ti Grade 19 heat treated to ST — pick for cold forming, coiling of springs, deep drawing or machining before a final aging cycle. Ti Grade 19-ST 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). Ti Grade 19-ST 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).
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-ST properties
Typical room-temperature values for Ti Grade 19-ST; 18 are specific to this condition. Other listed values are Ti Grade 19 reference data and may not represent this condition. Bars are the position among titanium grades.
Physical3
Ti Grade 19-ST 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-ST 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-ST 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-ST 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-ST 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-ST'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. Confirm any required mill or lot documentation when quoting.
Working with Ti Grade 19-ST
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.
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.
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 | — |
Ti Grade 19-ST — frequently asked
What is Ti Grade 19-ST used for?
Ti Grade 19-ST 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-ST?
Ti Grade 19-ST 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-ST 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-ST 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-ST?
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-ST 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-ST?
Ti Grade 19-ST 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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.