Standard

Titanium tubing for trekking poles,Titanium sheet,Titanium bar

ASTM B367-Titanium and Titanium Alloy Castings

Standard Specification for Titanium and Titanium Alloy Castings


ASTM B367 covers titanium and titanium alloy castings produced by investment casting, centrifugal casting, or other approved methods. These castings are intended for aerospace, medical, marine, chemical, and industrial applications, including structural and pressure-containing parts.


Applicable Grades (UNS Designations)

Grade

UNS Number

Description

Gr C-1

J50250

CP titanium, similar to wrought Gr 2

Gr C-2

J50350

CP titanium, similar to wrought Gr 3

Gr C-3

J50460

CP titanium, similar to wrought Gr 4

Gr C-4

J50550

CP titanium, high strength CP

Gr C-5

J50605

Ti-6Al-4V, general-purpose alloy

Gr C-6

J50610

Ti-5Al-2.5Sn, aerospace use

Gr C-7

J50611

Ti-6Al-4V ELI, improved ductility, medical use

Gr C-8

J50612

Ti-6Al-6V-2Sn, higher strength

Gr C-12

J50614

Ti-0.3Mo-0.8Ni, corrosion-resistant

Custom compositions are permitted by agreement.


Manufacturing Processes

Investment casting (lost-wax): Most common method for precision parts

Centrifugal casting: Often used for tubular parts

Other methods: Allowed with purchaser approval


Heat treatment is mandatory for most grades to develop mechanical properties. Methods include:

Annealing

Solution treatment and aging (STA)

Stress relieving (as required)


Mechanical Properties (Typical Minimums)

Grade

UTS (MPa)

YS (MPa)

Elongation (%)

Reduction of Area (%)

C-5 (Ti-6Al-4V)

≥ 895

≥ 825

≥ 4 (castings)

≥ 10

C-7 (Ti-6Al-4V ELI)

≥ 860

≥ 795

≥ 6

≥ 15

C-12 (Ti-0.3Mo-0.8Ni)

≥ 485

≥ 345

≥ 18

≥ 25

Note: Actual values depend on the casting shape, heat treatment, and section thickness.


Dimensional Tolerances

As per customer drawings or investment casting industry standards.

Typically, linear tolerances ±0.5 mm to ±1.5 mm depending on size and complexity.

Surface finish: 3.2–6.3 μm Ra (125–250 μin) typical.


Inspection and Testing

Chemical Analysis: Per ASTM E539 / E2922 or equivalent.

Mechanical Testing: Tensile test on separately cast or integrally cast test bars.

Non-Destructive Testing (NDT): Visual + optional RT, PT, UT (especially aerospace/medical).

Dimensional Inspection: Per drawing/spec; includes shrinkage allowances.

Test bars must represent the final heat-treated condition of the casting.


Marking Requirements

Each casting must be marked with:

Manufacturer's name or trademark

ASTM B367

Grade designation

Heat number or melt identification

Optional: serial number or part number


Mill Test Report (MTR) must include:

Chemical analysis

Mechanical test results

NDT results (if performed)

Heat treatment record


Related Standards

ASTM F1108-Ti-6Al-4V castings for surgical implants        

ASTM F1472-Wrought Ti-6Al-4V (comparison standard)

AMS 4991-Aerospace casting spec for Gr C-5   

ASTM B381-Forgings, alternate form for many parts