Specifications

Ti-6Al-2Sn-4Zr-2Mo, commonly referred to as Ti-6242, is a crucial near-α high-temperature titanium alloy. It is renowned for its excellent high-temperature performance, robust toughness, and creep resistance.

Material Description

Ti-6Al-2Sn-4Zr-2Mo, commonly known as Ti-6242, is a near-alpha titanium alloy designed for high-temperature strength and excellent creep resistance up to around 550 °C (1020 °F). It offers superior tensile and fatigue strength compared with commercially pure titanium and is widely used in aerospace, gas turbine, and high-performance engineering applications.

Chemical Composition (Typical, % by weight)

Element	Al	Sn	Zr	Mo	Ti	Others
Content	6.0	2.0	4.0	2.0	Balance	≤ 0.3 (Fe, O, N, C, H combined limits)

Standard Reference: AMS 4919 / AMS 4975 / ASTM B348 (for bars and billets)

Forms and Dimensions

Product Form: Round bars, square bars, forged bars, or billets.

Parameter	Typical Range
Diameter / Size	6 mm – 250 mm (¼ in – 10 in)
Length	Up to 6000 mm (20 ft), custom lengths available
Tolerance	According to ASTM B348 or AMS 4928 (tight tolerances available upon request)

Mechanical Properties (at Room Temperature)

Property	Typical Value
Tensile Strength (UTS)	895 – 965 MPa (130 – 140 ksi)
Yield Strength (0.2% offset)	830 – 895 MPa (120 – 130 ksi)
Elongation	≥ 10%
Reduction of Area	≥ 25%
Hardness	320 – 360 HB
Density	4.54 g/cm³
Elastic Modulus	~110 GPa

Note: Actual values depend on heat treatment condition (typically solution treated and aged, STA).

Heat Treatment Conditions

Mill Annealed (MA)

For improved machinability and formability.

Solution Treated and Aged (STA)

For maximum strength and creep resistance at elevated temperature.

Beta Annealed

Optional condition for specific aerospace standards.

Standards and Specifications

ASTM B348

Titanium and Titanium Alloy Bars and Billets

AMS 4975 / AMS 4928

Aerospace Material Specifications for Ti-6Al-2Sn-4Zr-2Mo

ISO 24034

Titanium alloy bars and billets (Ti-6Al-2Sn-4Zr-2Mo)

Typical Applications

Compressor and turbine components in jet engines
Aerospace structural parts requiring high-temperature strength
Gas turbine casings, discs, and seals
Automotive racing components and performance parts
High-performance fasteners and springs

Surface Finish

As-forged, machined, or centerless ground surface
Ra ≤ 1.6 μm (for precision bars)
Clean, oxide-free surface per ASTM B600

Example Specification Statement

Ti-6Al-2Sn-4Zr-2Mo (Ti-6242) titanium alloy bars, produced per AMS 4975, diameter 50 mm, condition solution treated and aged (STA), with a minimum tensile strength of 895 MPa, maximum hardness 360 HB, and supplied with full mill test certification.

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