Titanium PT-7M
PT-7M is a corrosion-resistant alpha titanium alloy strengthened with a zirconium addition, developed as a chemical-service grade rather than a structural one.
Reference datasheet — PT-7M 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
PT-7M tempers and conditions
PT-7M is supplied in 5 conditions, soft to hard. M is the default FabDigit quotes; the values on this page are for it.
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 |
MDefault 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?
PT-7M is a corrosion-resistant alpha titanium alloy strengthened with a zirconium addition, developed as a chemical-service grade rather than a structural one. It delivers 370 MPa yield, 500 MPa tensile strength and 25 % elongation at 160 HB, with service to 350 °C, and is used mainly as thin-wall tube, sheet, plate and welded fabrications for acid and seawater duty. Weldability and corrosion resistance are its strong points (scores 88 and 88), but strength is low, it cannot be heat treated to higher levels, and machinability (38) is typical for titanium. Where Zr-bearing stock is unavailable, Pd-alloyed CP grades cover a similar service role. PT-7M 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). PT-7M 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).
What is PT-7M used for?
- Chemical processing equipment
- Heat exchanger and condenser tubing
- Acid service piping and fittings
- Marine components and seawater hardware
- Welded pressure vessel liners
- Thin-wall bellows and expansion joints
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 properties
Typical room-temperature values for PT-7M-M; bars are the position among titanium grades.
Physical3
PT-7M 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 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 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 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 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'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. 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. PT-7M is highlighted; hover a dot for its name, or open the interactive family chart.
Working with PT-7M
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.
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 |
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.
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 PT-7M cost?
PT-7M 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.
PT-7M — frequently asked
What is PT-7M used for?
PT-7M 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?
PT-7M 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 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 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?
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 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?
PT-7M 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.
How much does PT-7M cost?
PT-7M 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
- 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; 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.