ASTM B348 is a standard specification for titanium and titanium alloy bars and billets. Grade 5 titanium (also known as Ti-6Al-4V) is a popular alloy due to its high strength, low density, and excellent corrosion resistance. It contains 6% aluminum and 4% vanadium.

The different manufacturers could have variations in their production process and quality control, but in general, ASTM B348 GR5 titanium bar should meet the following requirements:

- Chemical composition: The alloy should meet the specified maximum and minimum percentages of different elements such as iron, carbon, oxygen, nitrogen, hydrogen, etc.
- Mechanical properties: The bar should have a minimum tensile strength of 895 MPa (130 ksi) and a minimum yield strength of 828 MPa (120 ksi). The elongation should be at least 10%.
- Dimensions and tolerances: The bar should be produced in certain diameters, lengths, and tolerances according to the specified requirements. The surface finish, straightness, and roundness should also meet the standards.

ASTM B348 GR5 titanium bar is used in various industries, such as aerospace, medical, marine, and chemical. It can be machined, welded, and formed easily, but special care should be taken due to the high reactivity of titanium.

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