Titanium Ti Grade 36-SR (Stress relieved)
Heat-treated state
UNS R58450 · ASTM Grade 36
Pick when dimensional stability after cold forming or machining matters but full softening is not wanted.
Values for the SR condition
Other Ti Grade 36 tempers and conditions
Ti Grade 36 is listed in 4 conditions; see the grade overview at Ti Grade 36.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AnnealedDefault recrystallization annealed (mill annealed) | Standard stock condition for bar, wire and strip; maximum ductility for cold heading, swaging and deep forming. | 340 | 420 | 25 | 78 HRB | — |
As-forged / hot worked | Hot-worked forgings and billet before final anneal; used for near-net medical and chemical-plant components. | 350 | 430 | 22 | 143 HB | 2.9 % IACS |
SRThis page Stress relieved | Pick when dimensional stability after cold forming or machining matters but full softening is not wanted. | 400 | 470 | 20 | 157 HB | 2.9 % IACS |
Cold worked | Use where higher strength and spring-back are needed in bar or strip while retaining useful ductility. | 560 | 620 | 12 | 16 HRC | 2.8 % IACS |
What is Ti Grade 36-SR?
Ti Grade 36-SR is Ti Grade 36 heat treated to SR — pick when dimensional stability after cold forming or machining matters but full softening is not wanted. Ti Grade 36-SR has a yield strength of 400 MPa (58 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 68% of titanium grades. Elongation at break is 20% and the elastic modulus is 62 GPa (8.99 Msi). Ti Grade 36-SR has a density of 5.7 g/cm³ (0.206 lb/in³), heavier than 100% of titanium grades. It melts at 1,720°C (3,128 °F). Annealed is the default condition FabDigit quotes; SR is available on request or by drawing note.
Advantages
- Forms and bends easily — 80/100, better than 90% of titanium grades
Limitations
- Low stiffness — 62 GPa (8.99 Msi), worse than 100% of titanium grades
- Heavy — 5.7 g/cm³ (0.206 lb/in³), worse than 100% of titanium grades
Ti Grade 36-SR properties
Typical room-temperature values for Ti Grade 36-SR; 21 are specific to this condition. Other listed values are Ti Grade 36 reference data and may not represent this condition. Bars are the position among titanium grades.
Physical3
Ti Grade 36-SR has a density of 5.7 g/cm³ (0.206 lb/in³), heavier than 100% of titanium grades. It melts at 1,720°C (3,128 °F).
Mechanical15
Ti Grade 36-SR has a yield strength of 400 MPa (58 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 68% of titanium grades. Elongation at break is 20% and the elastic modulus is 62 GPa (8.99 Msi).
Thermal6
Ti Grade 36-SR is rated for continuous service to 300°C (572 °F). It conducts heat at 10 W/m·K (5.78 BTU/hr·ft·°F), better than 57% of titanium grades. Thermal expansion is 8 µm/m·K (4.44 µin/in·°F).
Electrical3
Ti Grade 36-SR conducts electricity at 2.9 % IACS, better than 58% of titanium grades.
Chemical & Environmental3
Corrosion resistance is excellent (92/100), better than 53% of titanium grades.
Sustainability4
Producing a kilogram of Ti Grade 36-SR takes about 720 MJ of energy and emits 46 kg of CO₂ — more than 92% of titanium grades. Typical recycled content is 20%.
Manufacturability8
Ti Grade 36-SR's machinability is poor (28/100, better than 59% of titanium grades); weldability very good (78/100); formability very good (80/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Ti Grade 36-SR
Is Ti Grade 36 easy to machine?
Gummy and low-conductivity: use sharp uncoated carbide, low surface speed (~20–35 m/min), heavy positive rake, high-pressure flood coolant and avoid dwelling to prevent work hardening and smearing.
Can Ti Grade 36 be welded?
Readily GTAW, plasma or EB welded with full argon/vacuum shielding and trailing gas; joints stay ductile, but any air pickup embrittles the weld.
Can Ti Grade 36 be formed, bent or molded?
Outstanding cold formability — deep drawing, swaging, cold heading and >80 % wire drawing are practical; use high spring-back allowance and Ti-safe lubricants, anneal at ~700–800 °C in vacuum between heavy passes.
What surface finishes work on Ti Grade 36?
Pickle in HNO3/HF to remove alpha case, then polish or electropolish; anodizes to bright interference colors and accepts passivation per ASTM F86 for implants.
Ti Grade 36 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 |
|---|---|---|
| Nbbeta stabilizer, defining addition | 42.5 – 47.5 | 45 |
| O | ≤ 0.16 | 0.1 |
| Fe | ≤ 0.1 | 0.03 |
| C | ≤ 0.04 | 0.01 |
| N | ≤ 0.02 | 0.01 |
| Hhigher limit may apply to wire/sheet product forms | ≤ 0 | 0 |
| Other, eachresidual elements | ≤ 0.1 | — |
| Other, totalresidual elements | ≤ 0.4 | — |
| Ti | balance | — |
Ti Grade 36-SR — frequently asked
What is Ti Grade 36-SR used for?
Ti Grade 36-SR is typically used for MRI-compatible medical device components, cold-drawn wire for medical assemblies, chemical process equipment for strong acids, acid-service piping and vessel internals, deep-drawn corrosion-resistant housings and cold-headed fasteners and swaged fittings. In short: most formable titanium grade; MRI-compatible beta alloy; extreme acid corrosion resistance.
What is the yield strength of Ti Grade 36-SR?
Ti Grade 36-SR has a typical yield strength of 400 MPa (58 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 68% of titanium grades. Strength varies by condition: see the 4 listed tempers.
Is Ti Grade 36-SR easy to machine?
Not especially — machinability is rated poor (28/100, better than 59% of titanium grades). Gummy and low-conductivity: use sharp uncoated carbide, low surface speed (~20–35 m/min), heavy positive rake, high-pressure flood coolant and avoid dwelling to prevent work hardening and smearing.
Can Ti Grade 36-SR be welded?
Yes — weldability is rated very good (78/100). Readily GTAW, plasma or EB welded with full argon/vacuum shielding and trailing gas; joints stay ductile, but any air pickup embrittles the weld.
What surface finishes work on Ti Grade 36-SR?
Pickle in HNO3/HF to remove alpha case, then polish or electropolish; anodizes to bright interference colors and accepts passivation per ASTM F86 for implants.
Can Ti Grade 36-SR be formed, bent or molded?
Outstanding cold formability — deep drawing, swaging, cold heading and >80 % wire drawing are practical; use high spring-back allowance and Ti-safe lubricants, anneal at ~700–800 °C in vacuum between heavy passes.
What is the maximum service temperature of Ti Grade 36-SR?
Ti Grade 36-SR is rated for continuous use to about 300°C (572 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Ti Grade 36 Annealed and Ti Grade 36-CW?
Annealed is the default condition — standard stock condition for bar, wire and strip; maximum ductility for cold heading, swaging and deep forming. CW: use where higher strength and spring-back are needed in bar or strip while retaining useful ductility. Yield strength is 340 MPa in Annealed versus 560 MPa in CW.
Sources
- ASTM B348 — Titanium and Titanium Alloy Bars and Billets (Grade 36) — ASTM International (2021)
- ASTM B863 — Titanium and Titanium Alloy Wire (Grade 36) — ASTM International (2020)
- ASTM B381 — Titanium and Titanium Alloy Forgings — ASTM International (2019)
- ASTM B265 — Titanium and Titanium Alloy Strip, Sheet and Plate — ASTM International (2020)
- AMS 4982 — Titanium Alloy 45Nb Bar and Wire, Annealed — SAE International (2018)
- ASM Handbook Vol. 2 — Properties of Nonferrous Alloys (Titanium) — ASM International (1990)
- Materials Properties Handbook: Titanium Alloys — ASM International (1994)
- Ti-45Nb wire and bar technical data — Titanium mill/wire producers (2023)
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.