Titanium information and technical support

Titanium know-how at TWI
Help for TWI Industrial Members
Technical information on titanium and its alloys

Titanium know-how at TWI

With long-established use in the aerospace and chemical processing industries, titanium and its alloys are now seeing rapidly increasing application in other areas such as the medical, construction, oil & gas and automotive sectors. Through working on titanium alloys for several decades (virtually since titanium was first adopted as an engineering material), TWI has developed considerable experience of its fabrication and performance. In recent years, TWI has carried out significant work in the following areas:

• Failure investigations and consultation
  - failure in fabrication and failure during service
  - fitness-for-purpose studies, including engineering critical assessment
  - material selection and design and fabrication guidance
  
  
• Fabrication methods
  - electron beam and laser welding (CO ₂ and Nd-YAG)
  - TIG (GTAW), MIG (GMAW) and plasma welding
  - activated TIG (A-TIG) welding
  - friction welding (rotary, linear and friction stir)
  - diffusion bonding
  - brazing
  - adhesive bonding
  
  
• Fabrication issues
  - distortion
  - contamination
  
  
• Materials performance
  - strength
  - fatigue
  - fracture
  - sustained load cracking
  - creep
  - corrosion

Help for TWI Industrial Members

If you work for a TWI Industrial Member company and would like to discuss any aspect of titanium fabrication or performance, you can -

• contact us by telephone (+44 (0)1223 891 162), and our Reception staff will put you through to a TWI specialist; or -
  
  
• use TWI Contacts Online to find the right TWI specialist; click T in the index and scroll down to Titanium and its alloys.

Some of the more common technical areas are covered briefly in the following, freely available, links.

Technical information on titanium and its alloys

Although TWI's substantial pool of titanium know-how is available only to its Industrial Member companies, TWI also works with a titanium trade association. The information below is made freely available on TWI's website by kind permission of the Titanium Information Group (TIG). Through its core interest in materials joining and allied technologies, TWI has been an active member of TIG for almost a decade. Further information is available on the TIG website: www.titaniuminfogroup.co.uk

To view and print the items below you'll need Adobe Acrobat Reader which can be downloaded free of charge from www.adobe.com/prodindex/acrobat/readstep.html

Also, you'll need to be a registered user of TWI's website. Registration is free of charge and available immediately after completing the on-screen form.

To help you find what you need, the information is grouped under the following headings:

Alloys
- specifications
- specific alloys
- product forms
Uses
Corrosion
Characteristics
Fabrication
Guides to best practice

Alloys - specifications

AMS specifications
ASTM specifications
UNS numbers for titanium alloys
German specifications
MIL specifications

Alloys - specific alloys

Commercially pure titanium ASTM Grade 1
Commercially pure titanium ASTM Grade 2
Commercially pure titanium ASTM Grade 3
Commercially pure titanium ASTM Grade 4
Ti-6Al-4V ASTM Grades 5, 23, 24, 25 and 29
Ti-5Al-2.5Sn ASTM Grade 6
Ti-Pd ASTM Grades 7 and 16
Ti-3Al-2.5V ASTM Grades 9 and 18
Ti-Pd ASTM Grades 11 and 17
Ti-0.3Mo-0.8Ni ASTM Grade 12
Beta C ASTM Grades 19 and 20
Timetal ^® 21S ASTM Grade 21
Ti-Ru ASTM Grades 26 and 27
Ti-2.5Cu Timetal ^® 230
Ti-6Al-7Nb Alloy 367
Ti-4Al-4Mo-4Sn-0.5Si-0.1C Timetal ^® 551
Ti-6Al-6V-2Sn
Ti-10V-2Fe-3Al
Ti-15V-3Cr-3Sn-3Al Timetal ^® 15.3
Ti-5Al-2Sn-4Mo-2Zr-4Cr
Ti-6Al-2Sn-4Zr-2Mo
Ti-6Al-2Sn-4Zr-6Mo
Ti-11Sn-5Zr-2.5Al-1Mo-0.2Si Timetal ^® 679
Ti-6Al-5Zr-0.5Mo-0.25Si Timetal ^® 685
Ti-5.5Al-3.5Sn-3Zr-1Nb Timetal ^® 829
Ti-5.8Al-4Sn-3.5Zr-0.7Nb Timetal ^® 834

Alloys - product forms

Alloys available in extruded forms

Uses

Alloy uses
Architectural applications
Cladding to other materials
High stress applications in sea water
Low cost titanium valves
Aerospace alloys and applications
Automotive applications
Medical applications

Corrosion

Acid resistance
Crevice corrosion
Erosion and cavitation resistance
Resistance to flue gas desulphurisation (FGD) fluorides
Galvanic corrosion
NACE MR0175 accredited alloys for sour service
Titanium and methanol stress corrosion cracking
Titanium resistance to organic media
Titanium in seawater
Titanium alloys for sour service
Titanium and mercury

Characteristics

Alpha case
Beta alloys
Coefficient of expansion
Cutting with a band-saw
Materials safety datasheet
Titanium oxide film - formation and preservation
Titanium and hydrogen

Fabrication

Heat treatments
Wear resistance by oxidation diffusion hardening
Shot peening
Titanium design codes
Connecting titanium to other metals

Guides to best practice

Surface treatment of titanium
Titanium for offshore and marine applications
Welding titanium

Further information

In addition to the above information, there are other relevant items on TWI's website. Sorry, but some information is only available to TWI Industrial Members. Copyright © 2004 TWI Ltd