Titanium Grade 4 (UNS R50700)

  • High resistance to corrosion
  • Good formability and weldability
  • Strongest among the commercially pure Titanium
  • Less ductile compared to other grades
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Grade 4 Titanium is the strongest among the commercially pure Titanium. It can resist corrosion by acids and gases quite effectively. Being less malleable, it can be difficult to draw wires or thin sheets out of this material, but of course, in no way, this stops it from being a versatile component for various manufacturing industries.

Titanium grade 4 finds its use in a wide variety of fields like aerospace and medical industries. It tells us how reliable this material is in terms of strength, as it is used by the sectors dealing with human lives directly.

Common names:

  • Titanium grade 4
  • CP titanium grade 4
  • Ti 70
  • CP4 Titanium
  • CP-70

Chemical properties:

  • Titanium (%): 98.6
  • Iron (%):Max 0.5
  • Oxygen (%): Max 0.4
  • Carbon (%): Max 0.08
  • Nitrogen (%): Max 0.05
  • Others (%): Remainder

Mechanical properties:

  • Yield Strength (MPa):560
  • Yield Strength (psi):81200
  • Tensile Strength (MPa):680
  • Tensile strength (psi):98600
  • Break Elongation:23 %
  • Elasticity Modulus (GPa):105-120
  • Elasticity Modulus (KSI):15200-17400
  • Hardness (HV):250

Physical properties:

  • Density: 0.1630(Lb/in3) /4.512 (g/cm3)
  • Melting point: 3020 (oF) / 1660(oC)
  • Thermal Expansion Coefficient: 8.60 (0-100oC) /4.78 (32-212oF)
  • Thermal Conductivity: 16.95 (W/mK) / 117.6(BTU-in/hr-ft2oF)
  • Electrical Resistivity: 53.3 (µohm-cm) /21 (µohm-in)
  • Poisson’s ratio: 0.34-0.40 (No unit)

Key features:

  • High corrosion resistance: Titanium grade 4 is excellent when it comes to corrosion resistive acids and gases. That is why it has paved its way in multiple machine parts that get exposed to such corrosive agents at work.
  • Strong and reliable: Grade 4 is the strongest among the pure grade Titanium alloys. So, it can withstand more punishment compared to other grades. This strength is due to the highest allowable Oxygen and Iron content present in the grade.
  • High weldability: Though being less ductile, CP-4 Titanium has appreciable weldability and formability. Thus, designing machine parts out of this grade is super easy and effective.

Product Forms Available:

  • Bars, Forging stock, Wires, Plates, Foils, Sheets, Billet, Pipes
  • Bar, Wire, and Forging Stock: ASME SB-348, ASTM F-67, AMS 4921, ASME SB-381, MIL-T-9047 CP-70
  • Plate, Sheet, Strip, and Foil: ASME SB-265, AMS 4901, MIL-Y-9046 CP-70, AMS 4902, ASTM B265


  • Jet engine components
  • Aerospace and marine industries
  • Chemical processing and desalinization plants
  • Pulp and paper production
  • Corrosive waste disposal wells
  • Medical and surgical components

Possible Alternative Grades:

  • Titanium Grade 12: It is a very strong Titanium grade that is highly weldable and durable. This alloy can withstand high temperatures and is an excellent choice for marine and airfare components.
  • Titanium Grade 7: This material provides strong resistance to corrosion and oxidation, thus is widely used in multiple industries.

Frequently Asked Questions:

  • At what temperature can annealing of grade 4 be done?

Annealing of Titanium gr 4 is generally done at 1290oF.

  • Is this grade bulletproof?

No. Though it is a very strong grade, it is not bulletproof.

  • What methods can be used for forming grade 4?

Hot or cold forming can be done by using power brake, hydro press, stretch or drop hammer methods.

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