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Titanium Grade 2/2H (UNS R50400)

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Titanium Grade 2/2H (UNS R50400)

Titanium Grade 2/2H (UNS R50400) is a commercially pure titanium alloy, known for its excellent corrosion resistance, high strength-to-weight ratio, and outstanding ductility. It is widely used in industries like aerospace, marine, medical, and chemical processing due to its ability to withstand harsh environments and resist corrosion from a wide range of chemicals. This grade is often favored for applications requiring superior weldability and formability. The “2H” variant is specified for applications needing higher strength while maintaining similar properties.


Key Properties

Corrosion Resistance: Exceptional resistance to corrosion in oxidizing and mildly reducing environments, including seawater, chlorides, and most industrial chemicals.
Lightweight Strength: Excellent strength-to-weight ratio, providing structural performance while reducing weight.
Biocompatibility: Non-toxic and biocompatible, making it suitable for medical implants and devices.
Weldability: Outstanding weldability without the need for preheating or post-weld heat treatment.
Ductility: High ductility and toughness, allowing for ease of forming and machining.


Technical Specifications

UNS: R50400

Available Thickness

3/16″
1/4″
3/8″
1/2″
5/8″
3/4″
7/8″
1″
4.8mm
6.3mm
9.5mm
12.7mm
15.9mm
19mm
22.2mm
25.4mm
1 1/4″
1 1/2″
2″
2 1/4″
2 1/2″
3″
2 1/2″
31.8mm
38.1mm
50.8mm
57.2mm
63.5mm
76.2mm
63.5mm
Titanium Grade 2/2H

Application

  • Automotive
  • Chemical and Pharmaceutical
  • Fertilizer
  • Food Processing and Handling
  • Manufacturing
  • Mining
  • Oil & Gas
  • Phosphate Mining

Standard

  • ASTM A240 / A240M
  • ASTM A276 / A276M
  • ASTM A312 / A312M
  • ISO 15510
  • EN 10088-2
  • IN 10204
  • HE G4304
  • HE G4305
  • ASME SA240 / SA240M
  • ASME SA312 / SA312M

Worldwide equivalents of Titanium Grade 2/2H (UNS R50400)

(USA: AISI, ASTM, UNS)

Country
Standard
Grade
United States
ASTM B265
Grade 2 / Grade 2H
Europe
EN 3.7035
Grade 2
Germany
DIN 17861
Grade 2
Japan
JIS H 4600
Grade 2
China
GB/T 13810
TA1
India
IS 4910
Grade 2
South Korea
KS D 4303
Grade 2
Australia
AS 1746
Grade 2

Corrosion Resistance

  • General Corrosion Resistance: Grade 2 titanium exhibits excellent resistance to a wide range of corrosive environments. It is particularly resistant to oxidation and corrosion in seawater, making it suitable for marine applications.

  • Acid Resistance: It performs well in environments with acids, including hydrochloric and sulfuric acids, though it is not immune to attack. For highly acidic environments, higher grades or specific alloying may be needed.

  • Chloride Environments: Titanium Grade 2 is also resistant to chloride-induced corrosion, which makes it effective in chemical processing and desalination applications.

Chemical Composition of Titanium Grade 2/2H (UNS R50400)

Element
Typical % Composition
Titanium (Ti)
98.8 – 99.2
Iron (Fe)
≤ 0.30
Oxygen (O)
≤ 0.25
Carbon (C)
≤ 0.10
Nitrogen (N)
≤ 0.05
Hydrogen (H)
≤ 0.015

Physical Properties of Titanium Grade 2/2H (UNS R50400)

Property
Value
Density
4.51 g/cm³
Melting Point
1,668°C (3,034°F)
Modulus of Elasticity
110-120 GPa (16-17.5 x 10⁶ psi)
Poisson’s Ratio
0.34
Thermal Conductivity
21.9 W/m·K
Specific Heat Capacity
0.523 J/g·K
Electrical Resistivity
43.1 μΩ·cm
Thermal Expansion Coefficient
8.6 × 10⁻⁶ /K
Vickers Hardness
180-240 HV
Rockwell Hardness
60-70 HRB

Mechanical Properties of Titanium Grade 2/2H (UNS R50400)

Property
Value  
Tensile Strength
344 MPa (50 ksi)
Yield Strength
275 MPa (40 ksi)
Elongation
20%
Hardness (Brinell)
150 HB
Hardness (Rockwell B)  
60-70 HRB
Modulus of Elasticity
110-120 GPa (16-17.5 x 10⁶ psi)
Shear Strength
207 MPa (30 ksi)
Fatigue Strength
138 MPa (20 ksi)
Fracture Toughness (K_IC)
55 MPa·√m (50 ksi·√in)

Fabrication Data

  • Machinability: Good, but requires sharp tools and appropriate cutting conditions to avoid excessive tool wear.
  • Weldability: Excellent; can be welded using conventional methods such as TIG (Tungsten Inert Gas) and MIG (Metal Inert Gas).
  • Formability: Easily formable; can be cold worked or hot worked.
  • Heat Treatment: Not typically heat treated. Cold working or annealing can be used to alter mechanical properti
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