Titanium PT-7M-M
Heat-treated state · default condition
M = thermomechanically controlled processed
Standard supply condition for corrosion tubing, plate and formed parts — maximum ductility and weldability.
Values for the M condition
Other PT-7M tempers and conditions
PT-7M is listed in 5 conditions; see the grade overview at PT-7M.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Hot rolled | Heavy sections, forged fittings, tube-sheets and flanges where thick-product ductility matters more than peak strength. | 350 | 480 | 24 | 155 HB | 3 % IACS |
MDefaultThis page Thermomechanically controlled processed | Standard supply condition for corrosion tubing, plate and formed parts — maximum ductility and weldability. | 370 | 500 | 25 | 160 HB | — |
As-welded deposit | Reference condition for welded tube and piping joints; strength close to base annealed metal, ductility slightly lower. | 380 | 490 | 18 | 175 HB | 3 % IACS |
Stress relieved | Use for cold-formed or welded assemblies where residual stress and distortion must be removed but cold-work strength is partly retained. | 470 | 570 | 18 | 180 HB | 3 % IACS |
Cold worked | Pick when higher strength/stiffer thin-wall tube is needed and no further forming or high-temperature exposure follows. | 570 | 640 | 12 | 200 HB | 3 % IACS |
What is PT-7M-M?
PT-7M-M is PT-7M heat treated to M — standard supply condition for corrosion tubing, plate and formed parts — maximum ductility and weldability. PT-7M-M has a yield strength of 370 MPa (53.7 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 76% of titanium grades. Elongation at break is 25% and the elastic modulus is 105 GPa (15.2 Msi). PT-7M-M has a density of 4.49 g/cm³ (0.162 lb/in³), lighter than 65% of titanium grades. It melts at 1,620°C (2,948 °F).
Advantages
- Low embodied carbon — 35 kg CO₂/kg, better than 100% of titanium grades
- Easy to machine — 38/100, better than 85% of titanium grades
- Ductile — tolerates forming and impact — 25%, better than 82% of titanium grades
- Tough — resists crack growth — 80 MPa·√m (72.8 ksi·√in), better than 81% of titanium grades
- Forms and bends easily — 72/100, better than 78% of titanium grades
Limitations
- Low strength — 370 MPa (53.7 ksi), worse than 76% of titanium grades
PT-7M-M properties
Typical room-temperature values for PT-7M-M; 12 are specific to this condition. Other listed values are PT-7M reference data and may not represent this condition. Bars are the position among titanium grades.
Physical3
PT-7M-M has a density of 4.49 g/cm³ (0.162 lb/in³), lighter than 65% of titanium grades. It melts at 1,620°C (2,948 °F).
Mechanical16
PT-7M-M has a yield strength of 370 MPa (53.7 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 76% of titanium grades. Elongation at break is 25% and the elastic modulus is 105 GPa (15.2 Msi).
Thermal6
PT-7M-M is rated for continuous service to 350°C (662 °F). It conducts heat at 13.5 W/m·K (7.8 BTU/hr·ft·°F), better than 58% of titanium grades. Thermal expansion is 8.6 µm/m·K (4.78 µin/in·°F).
Electrical3
PT-7M-M conducts electricity at 3 % IACS, better than 60% of titanium grades.
Chemical & Environmental3
Corrosion resistance is excellent (88/100), worse than 77% of titanium grades.
Sustainability4
Producing a kilogram of PT-7M-M takes about 600 MJ of energy and emits 35 kg of CO₂ — less than 100% of titanium grades. Typical recycled content is 25%.
Manufacturability8
PT-7M-M's machinability is fair (38/100, better than 85% of titanium grades); weldability excellent (88/100); formability very good (72/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with PT-7M-M
Is PT-7M easy to machine?
Machine like CP titanium: sharp uncoated carbide or coated inserts, low surface speed (25–45 m/min), heavy feed to avoid rubbing, flood coolant, never dwell — chips are gummy and work-harden the surface.
Can PT-7M be welded?
Excellent GTAW/plasma/EB weldability with matching or CP-Ti filler; needs full inert shielding plus trailing shield and clean, oxide-free edges, and interpass/backing gas below 150 ppm O2 to avoid embrittlement.
Can PT-7M be formed, bent or molded?
Good cold formability for thin-wall tube bending, expansion and deep drawing; allow generous bend radii (≈3–4 t), expect springback, and hot form at 550–700 °C for heavy sections followed by annealing at 600–680 °C.
What surface finishes work on PT-7M?
Pickle in HNO3/HF to remove alpha-case and heat tint after annealing/welding; colour anodizing and passivation are straightforward, but the alloy galls easily so mating surfaces need PVD, anodic oxidation or solid-film lubricant.
PT-7M 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 strengthener | 1.8 – 2.5 | 2.2 |
| Zrsolid-solution / corrosion improvement | 2 – 3 | 2.5 |
| Feimpurity limit | ≤ 0.25 | — |
| Siimpurity limit | ≤ 0.12 | — |
| Cimpurity limit | ≤ 0.1 | — |
| Oimpurity limit | ≤ 0.12 | — |
| Nimpurity limit | ≤ 0.04 | — |
| Himpurity limit | ≤ 0.01 | — |
| Ti | balance | — |
PT-7M-M — frequently asked
What is PT-7M-M used for?
PT-7M-M is typically used for chemical processing equipment, heat exchanger and condenser tubing, acid service piping and fittings, marine components and seawater hardware, welded pressure vessel liners and thin-wall bellows and expansion joints. In short: zirconium-bearing alpha grade; highly weldable titanium; chemical-service corrosion alloy.
What is the yield strength of PT-7M-M?
PT-7M-M has a typical yield strength of 370 MPa (53.7 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 76% of titanium grades. Strength varies by condition: see the 5 listed tempers.
Is PT-7M-M easy to machine?
Not especially — machinability is rated fair (38/100, better than 85% of titanium grades). Machine like CP titanium: sharp uncoated carbide or coated inserts, low surface speed (25–45 m/min), heavy feed to avoid rubbing, flood coolant, never dwell — chips are gummy and work-harden the surface.
Can PT-7M-M be welded?
Yes — weldability is rated excellent (88/100). Excellent GTAW/plasma/EB weldability with matching or CP-Ti filler; needs full inert shielding plus trailing shield and clean, oxide-free edges, and interpass/backing gas below 150 ppm O2 to avoid embrittlement.
What surface finishes work on PT-7M-M?
Pickle in HNO3/HF to remove alpha-case and heat tint after annealing/welding; colour anodizing and passivation are straightforward, but the alloy galls easily so mating surfaces need PVD, anodic oxidation or solid-film lubricant.
Can PT-7M-M be formed, bent or molded?
Good cold formability for thin-wall tube bending, expansion and deep drawing; allow generous bend radii (≈3–4 t), expect springback, and hot form at 550–700 °C for heavy sections followed by annealing at 600–680 °C.
What is the maximum service temperature of PT-7M-M?
PT-7M-M is rated for continuous use to about 350°C (662 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between PT-7M-M and PT-7M-CW?
M is the default condition — standard supply condition for corrosion tubing, plate and formed parts — maximum ductility and weldability. CW: pick when higher strength/stiffer thin-wall tube is needed and no further forming or high-temperature exposure follows. Yield strength is 370 MPa in M versus 570 MPa in CW.
Sources
- GOST 19807 — Titanium and titanium alloys, grades (ПТ-7М chemistry) — Gosstandart (1991)
- GB/T 3625 / GB/T 3624 — Titanium and titanium alloy tubes for heat exchangers (TA16, Ti-2Al-2.5Zr) — SAC (2007)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys (titanium alpha alloys) — ASM International (1990)
- Titanium: A Technical Guide — ASM International (2000)
- TA16 (Ti-2Al-2.5Zr) tube and plate datasheet — Baoti / Western Titanium (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.