Titanium OT4-1
OT4-1 is the lower-strength, higher-ductility member of the OT4 family — a manganese-bearing alpha titanium aimed at forming rather than load carrying.
Reference datasheet — OT4-1 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 M condition
OT4-1 tempers and conditions
OT4-1 is supplied in 4 conditions, soft to hard. M 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 |
|---|---|---|---|---|---|---|
Hot rolled | Use for welded shells and structures above 6 mm thick; hot rolling plus annealing and descaling gives 610 MPa tensile but slightly lower ductility (18%) than sheet. | 480 | 610 | 18 | 195 HB | 2.9 % IACS |
MDefault Thermomechanically controlled processed | Take the most widely stocked condition, vacuum or protective-atmosphere annealed sheet and strip, for cold bending, spinning and welded structures at 510 MPa yield and 24% elongation. | 510 | 640 | 24 | 200 HB | 2.9 % IACS |
Stress relieved | Specify vacuum stress relief at 550-650 °C after cold forming or welding to remove residual stress and springback and restore ductility to 20% elongation. | 530 | 650 | 20 | 205 HB | 2.9 % IACS |
Normalized | Pick strain-hardened cold-rolled sheet or strip when stiffness and strength govern and forming is minimal: yield rises to 700 MPa but elongation falls to 8%. | 700 | 780 | 8 | 24 HRC | 2.9 % IACS |
Supply forms, finishes and certifications
Ways OT4-1 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
M-BAR | M | Supply form |
What is OT4-1?
OT4-1 is the lower-strength, higher-ductility member of the OT4 family — a manganese-bearing alpha titanium aimed at forming rather than load carrying. Annealed sheet gives about 510 MPa yield, 640 MPa tensile, 24% elongation and 200 HB, with a formability score of 75, the highest in this group, and it welds readily. The trade-offs are a 330 °C service limit, no strengthening heat treatment and low machinability (score 32); use OT4 or TA17 where more strength is needed. OT4-1 has a density of 4.55 g/cm³ (0.164 lb/in³), heavier than 84% of titanium grades. It melts at 1,620°C (2,948 °F). OT4-1 has a yield strength of 510 MPa (74 ksi) and a tensile strength of 640 MPa (92.8 ksi) — weaker than 62% of titanium grades. Elongation at break is 24% and the elastic modulus is 110 GPa (16 Msi).
What is OT4-1 used for?
- Deep-formed sheet parts
- Ducting and transition sections
- Welded sheet assemblies
- Formed skins and covers
- Spun and roll-formed tube parts
- Clamps, shims and shrouds
Advantages
- Forms and bends easily — 75/100, better than 83% of titanium grades
- Ductile — tolerates forming and impact — 24%, better than 77% of titanium grades
OT4-1 properties
Typical room-temperature values for OT4-1-M; bars are the position among titanium grades.
Physical3
OT4-1 has a density of 4.55 g/cm³ (0.164 lb/in³), heavier than 84% of titanium grades. It melts at 1,620°C (2,948 °F).
Mechanical16
OT4-1 has a yield strength of 510 MPa (74 ksi) and a tensile strength of 640 MPa (92.8 ksi) — weaker than 62% of titanium grades. Elongation at break is 24% and the elastic modulus is 110 GPa (16 Msi).
Thermal6
OT4-1 is rated for continuous service to 330°C (626 °F). It conducts heat at 11 W/m·K (6.36 BTU/hr·ft·°F), better than 58% of titanium grades. Thermal expansion is 8.3 µm/m·K (4.61 µin/in·°F).
Electrical3
OT4-1 conducts electricity at 2.9 % IACS, better than 58% of titanium grades.
Chemical & Environmental3
Corrosion resistance is excellent (88/100), worse than 77% of titanium grades.
Sustainability4
Producing a kilogram of OT4-1 takes about 700 MJ of energy and emits 45 kg of CO₂ — more than 74% of titanium grades. Typical recycled content is 25%.
Manufacturability7
OT4-1's machinability is poor (32/100, better than 70% of titanium grades); weldability excellent (88/100); formability very good (75/100).
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. OT4-1 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with OT4-1
Is OT4-1 easy to machine?
Use low speed with high feed and copious high-pressure coolant. Sharp uncoated carbide or cobalt-bearing HSS tooling works well; avoid frictional heat and work hardening.
Can OT4-1 be welded?
TIG, plasma, electron-beam and spot welding all give good results. Maintain full inert-gas or vacuum shielding, keep surfaces clean, and stress relieve at 550–650 °C after welding if required.
Can OT4-1 be formed, bent or molded?
One of the best cold-forming titanium alloys, with bend radii down to 2–3t. Springback is large so overbend; warm form complex parts at 300–500 °C.
OT4-1 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 |
|---|---|---|
| Alalpha-stabilizing element | 1 – 2.5 | 1.7 |
| Mnbeta-stabilizing element | 0.7 – 2 | 1.2 |
| Fe | ≤ 0.3 | |
| Si | ≤ 0.15 | |
| Zr | ≤ 0.3 | |
| C | ≤ 0.1 | |
| O | ≤ 0.15 | |
| N | ≤ 0.05 | |
| Hhydrogen embrittlement sensitive, must be controlled | ≤ 0.01 | |
| Other, totalsum of other impurities | ≤ 0.3 | |
| Ti | balance |
What surface finishes work on OT4-1?
Descale by pickling in HNO₃/HF, then blast or colour anodise as required. Electroplating is not recommended; activate mechanically or chemically before painting.
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 OT4-1 cost?
OT4-1 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.
OT4-1 — frequently asked
What is OT4-1 used for?
OT4-1 is typically used for deep-formed sheet parts, ducting and transition sections, welded sheet assemblies, formed skins and covers, spun and roll-formed tube parts and clamps, shims and shrouds. In short: best cold-forming titanium; bend radii to 2t; lowest strength in family.
What is the yield strength of OT4-1?
OT4-1 has a typical yield strength of 510 MPa (74 ksi) and a tensile strength of 640 MPa (92.8 ksi) — weaker than 62% of titanium grades. Strength varies by condition: see the 4 listed tempers.
Is OT4-1 easy to machine?
Not especially — machinability is rated poor (32/100, better than 70% of titanium grades). Use low speed with high feed and copious high-pressure coolant. Sharp uncoated carbide or cobalt-bearing HSS tooling works well; avoid frictional heat and work hardening.
Can OT4-1 be welded?
Yes — weldability is rated excellent (88/100). TIG, plasma, electron-beam and spot welding all give good results. Maintain full inert-gas or vacuum shielding, keep surfaces clean, and stress relieve at 550–650 °C after welding if required.
What surface finishes work on OT4-1?
Descale by pickling in HNO₃/HF, then blast or colour anodise as required. Electroplating is not recommended; activate mechanically or chemically before painting.
Can OT4-1 be formed, bent or molded?
One of the best cold-forming titanium alloys, with bend radii down to 2–3t. Springback is large so overbend; warm form complex parts at 300–500 °C.
What is the maximum service temperature of OT4-1?
OT4-1 is rated for continuous use to about 330°C (626 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between OT4-1-M and OT4-1-N?
M is the default condition — take the most widely stocked condition, vacuum or protective-atmosphere annealed sheet and strip, for cold bending, spinning and welded structures at 510 MPa yield and 24% elongation. N: pick strain-hardened cold-rolled sheet or strip when stiffness and strength govern and forming is minimal: yield rises to 700 MPa but elongation falls to 8%. Yield strength is 510 MPa in M versus 700 MPa in N.
How much does OT4-1 cost?
OT4-1 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
- ГОСТ 19807-91 Титан и сплавы титановые деформируемые. Марки — Госстандарт (1991)
- ГОСТ 22178-76 Листы из титана и титановых сплавов — Госстандарт (1976)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- Титановые сплавы: свойства и применение (ВИАМ) — ВИАМ (2009)
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.