Titanium OT4 CR-H
Supply condition
CR-H = cold-rolled, work-hardened sheet
Use only where higher strength and flatness matter more than bend ductility; limited cold-work capacity in Ti.
Values for the CR-H condition
Other OT4 tempers and conditions
OT4 is listed in 5 conditions; see the grade overview at OT4.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
MDefault Thermomechanically controlled processed | Standard stocked condition for sheet and plate; best balance of strength, ductility and formability. | 640 | 780 | 16 | 22 HRC | 1.1 % IACS |
As-welded deposit | Reference condition for welded sheet assemblies; joint efficiency is high but ductility drops in the fusion zone. | 640 | 760 | 9 | 23 HRC | 1.1 % IACS |
Stress relieved | Applied after forming, welding or heavy machining to remove residual stress with almost no loss of strength. | 670 | 800 | 15 | 23 HRC | 1.1 % IACS |
Hot rolled | Cheapest mill condition for thick plate and forging stock that will be machined and annealed later. | 690 | 820 | 13 | 25 HRC | 1.1 % IACS |
CR-HThis page Cold-rolled, work-hardened sheet | Use only where higher strength and flatness matter more than bend ductility; limited cold-work capacity in Ti. | 820 | 900 | 8 | 29 HRC | 1.1 % IACS |
What is OT4 CR-H?
OT4 CR-H is OT4 supplied in the CR-H condition — use only where higher strength and flatness matter more than bend ductility; limited cold-work capacity in Ti. OT4 CR-H has a yield strength of 820 MPa (119 ksi) and a tensile strength of 900 MPa (131 ksi) — stronger than 62% of titanium grades. Elongation at break is 8% and the elastic modulus is 115 GPa (16.7 Msi). OT4 CR-H 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). M is the default condition FabDigit quotes; CR-H is available on request or by drawing note.
Limitations
- Limited ductility — 8%, worse than 99% of titanium grades
- Limited service temperature — 250°C (482 °F), worse than 99% of titanium grades
- Low fracture toughness — 50 MPa·√m (45.5 ksi·√in), worse than 96% of titanium grades
- Low electrical conductivity — 1.1 % IACS, worse than 78% of titanium grades
- Difficult to weld — 65/100, worse than 77% of titanium grades
OT4 CR-H properties
Typical room-temperature values for OT4 CR-H; 22 are specific to this condition. Other listed values are OT4 reference data and may not represent this condition. Bars are the position among titanium grades.
Physical3
OT4 CR-H 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).
Mechanical17
OT4 CR-H has a yield strength of 820 MPa (119 ksi) and a tensile strength of 900 MPa (131 ksi) — stronger than 62% of titanium grades. Elongation at break is 8% and the elastic modulus is 115 GPa (16.7 Msi).
Thermal6
OT4 CR-H is rated for continuous service to 250°C (482 °F). It conducts heat at 9.3 W/m·K (5.37 BTU/hr·ft·°F), better than 56% of titanium grades. Thermal expansion is 8.6 µm/m·K (4.78 µin/in·°F).
Electrical3
OT4 CR-H conducts electricity at 1.1 % IACS, worse than 78% of titanium grades.
Chemical & Environmental3
Corrosion resistance is excellent (86/100), worse than 86% of titanium grades.
Sustainability4
Producing a kilogram of OT4 CR-H takes about 620 MJ of energy and emits 38 kg of CO₂ — less than 97% of titanium grades. Typical recycled content is 25%.
Manufacturability7
OT4 CR-H's machinability is poor (24/100, worse than 51% of titanium grades); weldability good (65/100); formability poor (25/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with OT4 CR-H
Is OT4 easy to machine?
Machine like other titanium: rigid setup, sharp uncoated-carbide or coated tools, low surface speed (25–45 m/min), heavy positive feed and flood coolant to avoid work-hardening, galling and chip fires.
Can OT4 be welded?
Good fusion weldability by GTAW, plasma or EBW with full argon/vacuum shielding and trailing gas; keep interstitials low, clean thoroughly, and stress-relieve rather than post-weld solution treat.
Can OT4 be formed, bent or molded?
Annealed sheet cold-bends to moderate radii (~3–4 t) but springs back strongly; warm forming at 300–500 °C markedly improves formability and dimensional control.
What surface finishes work on OT4?
Pickle in HNO3/HF (short times, then bake to avoid hydrogen pickup), then anodise or apply plasma-electrolytic oxide for colour/wear; can be bead-blasted, brushed or polished, and takes primer/paint well after conversion coating.
OT4 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 stabiliser | 3.5 – 5 | 4.2 |
| Mnlow-cost beta stabiliser | 0.8 – 2 | 1.5 |
| Zrimpurity limit | ≤ 0.3 | — |
| Si | ≤ 0.15 | — |
| Fe | ≤ 0.3 | — |
| C | ≤ 0.1 | — |
| O | ≤ 0.15 | — |
| N | ≤ 0.05 | — |
| Hhydrogen embrittlement control | ≤ 0.01 | — |
| other impurities (total) | ≤ 0.3 | — |
| Ti | balance | — |
OT4 CR-H — frequently asked
What is OT4 CR-H used for?
OT4 CR-H is typically used for sheet metal parts and panels, forged fittings, welded sheet assemblies, formed brackets and stiffeners, ducting and tube components and moderately loaded structural covers. In short: manganese-stabilised low-cost alpha; formable weldable sheet grade; 350 °C service ceiling.
What is the yield strength of OT4 CR-H?
OT4 CR-H has a typical yield strength of 820 MPa (119 ksi) and a tensile strength of 900 MPa (131 ksi) — stronger than 62% of titanium grades. Strength varies by condition: see the 5 listed tempers.
Is OT4 CR-H easy to machine?
Not especially — machinability is rated poor (24/100, worse than 51% of titanium grades). Machine like other titanium: rigid setup, sharp uncoated-carbide or coated tools, low surface speed (25–45 m/min), heavy positive feed and flood coolant to avoid work-hardening, galling and chip fires.
Can OT4 CR-H be welded?
Yes — weldability is rated good (65/100). Good fusion weldability by GTAW, plasma or EBW with full argon/vacuum shielding and trailing gas; keep interstitials low, clean thoroughly, and stress-relieve rather than post-weld solution treat.
What surface finishes work on OT4 CR-H?
Pickle in HNO3/HF (short times, then bake to avoid hydrogen pickup), then anodise or apply plasma-electrolytic oxide for colour/wear; can be bead-blasted, brushed or polished, and takes primer/paint well after conversion coating.
Can OT4 CR-H be formed, bent or molded?
Annealed sheet cold-bends to moderate radii (~3–4 t) but springs back strongly; warm forming at 300–500 °C markedly improves formability and dimensional control.
What is the maximum service temperature of OT4 CR-H?
OT4 CR-H is rated for continuous use to about 250°C (482 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between OT4-M and OT4 CR-H?
M is the default condition — standard stocked condition for sheet and plate; best balance of strength, ductility and formability. CR-H: use only where higher strength and flatness matter more than bend ductility; limited cold-work capacity in Ti. Yield strength is 640 MPa in M versus 820 MPa in CR-H.
Sources
- GOST 19807 — Titanium and titanium alloys, grades — Gosstandart (1991)
- GOST 22178 — Titanium alloy sheets, technical requirements — Gosstandart (1976)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys (titanium section) — ASM International (1990)
- Titanium Alloys of the CIS — physical and mechanical property tables (VIAM data compilations) — VIAM / Metallurgiya (2000)
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.