Titanium bars are widely used in high-performance applications across aerospace, marine, medical, chemical processing, and industrial engineering sectors. Their exceptional strength-to-weight ratio, corrosion resistance, and biocompatibility make them a preferred choice for demanding environments. However, to ensure safety, consistency, and performance, titanium bars must meet strict quality standards—most notably those defined by ASTM International.

This article provides a comprehensive overview of the ASTM standards for titanium bars, helping engineers, buyers, and manufacturers understand the classification system, testing requirements, and compliance expectations. If you’re sourcing or specifying titanium bars, knowledge of these standards is essential.

This guide is brought to you by sakyalloy, a trusted global supplier of high-performance titanium and alloy bars compliant with ASTM, AMS, and ISO specifications.

What Is ASTM and Why Does It Matter?

ASTM International (formerly the American Society for Testing and Materials) develops technical standards for materials, products, systems, and services. For titanium bars, ASTM standards:

• Define chemical composition limits

• Set mechanical property requirements

• Specify testing procedures

• Ensure traceability and quality control

By adhering to ASTM standards, manufacturers ensure interchangeability, safety, and global acceptance of their titanium products.

Common ASTM Standards for Titanium Bars

There are several key ASTM specifications applicable to titanium bars. The most frequently used include:

1. ASTM B348 – Standard Specification for Titanium and Titanium Alloy Bars and Billets

• Scope: Covers titanium bars and billets for general industrial, aerospace, and commercial use

• Grades Covered: Commercially pure (Grades 1 to 4) and alloys (Grade 5, 7, 23, etc.)

• Key Requirements:

  • Chemical composition

  • Tensile strength, yield strength, elongation

  • Dimensional tolerances

  • Surface condition (hot rolled, pickled, turned, polished)

sakyalloy supplies ASTM B348-compliant titanium bars with full traceability and EN10204 3.1/3.2 test certificates.

2. ASTM F67 – Unalloyed Titanium for Surgical Implant Applications

• Scope: Specifies CP titanium for medical and surgical implants

• Grades: Grade 1 through Grade 4

• Features:

  • High biocompatibility

  • Requirements for tensile properties and microstructure

  • Low interstitial element limits

Used in: orthopedic rods, bone screws, spinal implants

3. ASTM F136 – Titanium-6Al-4V ELI Alloy for Surgical Implants

• Grade: Titanium Grade 23 (Ti-6Al-4V ELI)

• Application: Surgical implants requiring extra-low interstitials

• Features:

  • Higher fracture toughness

  • Better fatigue strength

  • Strict purity and microstructure controls

Used in: load-bearing implants, dental bars, and medical pins

4. ASTM B381 – Forgings of Titanium and Titanium Alloys

• Scope: Covers titanium bars produced by forging

• Grades: Same as B348 (Grades 1–5, 7, 9, 23, etc.)

• Testing: Includes ultrasonic testing and grain structure control

• Applications: Aerospace and heavy industrial components

While ASTM B348 covers rolled and hot-worked bars, B381 focuses on forged titanium products.

5. ASTM B265 – Titanium and Titanium Alloy Strip, Sheet, and Plate

Although not for bars, this standard is often cited alongside B348 for comprehensive titanium supply.

Used for: flat bar conversion, valve plates, structural panels.

ASTM Grades of Titanium Bars and Their Properties