Titanium 6al-6V-2sn Alloy Bar (UNS R56620, AMS 4986）

Product Introduction

As procurement professionals, let's thoroughly clarify the specifications of this Ti-6Al-6V-2Sn titanium alloy bar. When you encounter this grade, it means you are dealing with a "specialized alloy designed for specific high-performance needs" within the titanium alloy family; it's not a general-purpose grade.

Ti-6Al-6V-2Sn is an (α+β) type titanium alloy. It is a modified alloy developed from Ti-6Al-4V by increasing the vanadium (V) content to 6% and adding 2% tin (Sn). Its core value lies in achieving higher strength, better fatigue resistance, and superior fracture toughness compared to Ti-6Al-4V, without excessively sacrificing processability and weldability, especially exhibiting better performance uniformity in large cross-sectional dimensions.

The price level of Ti-6Al-6V-2Sn that we evaluated is 15% to 30% higher than that of Ti-6Al-4V, mainly due to the alloy composition (Sn) and the more complex manufacturing process. The most important negotiation points should focus on performance and testing (specifically on "UT inspection level," "mechanical property guarantee range," and "oxygen content control level"). We also leverage the advantages of domestic production to provide more users with mature alternative material solutions (leading domestic suppliers have significant advantages in price and delivery time, and can meet most high-end requirements). For traceability, it is important to pay attention to "metallurgical quality," and if necessary, inquire about the melting process (whether it uses triple vacuum arc remelting (VAR)), as this directly affects material purity and fatigue performance.

Typical Application Scenarios

(Determining Your Procurement Direction):

• Aerospace structural components: High-strength frames for aircraft fuselages, pylons, and landing gear components (especially those requiring extremely high fatigue life).
• High-performance racing cars and motorcycles: Lightweight, high-strength components such as suspension links and drive shafts.
• Military equipment: Structural components for armored vehicles and missiles.
• Specialized industries: High-strength, high-toughness oil drilling tools and high-performance springs.

Key point: If your client is a structural engineer in the aerospace or heavy equipment industry, they will typically turn to the Titanium 6Al-6V-2Sn alloy when the strength or toughness of Ti-6Al-4V does not meet design requirements. They are concerned with the overall balance of "strength-toughness-fatigue" and the hardenability of large cross-sections.

Procurement Specifications and Industry Standards

The accuracy of your price quotation directly reflects your level of professionalism.

1. Clarify Material Standards and Grades:

Our most commonly used Titanium 6Al-6V-2Sn Alloy Bar standard is AMS 4986 (Aerospace Material Specification, covering bars and forgings). Its unified designation is UNS R56620.
For example, our commonly used explicit description is: "Ti-6Al-6V-2Sn, conforming to AMS 4986 requirements.

2. Provide Detailed Specifications and Delivery Condition (Critical Clauses):

Based on past customer needs and market material availability, we generally stock diameters from Ф4mm to Ф600mm. You can specify your desired length, and we will perform simple processing for you. For unconventional specifications outside of this range, we also support customization. You need to pay attention to the final diameter, length, and tolerances (aerospace commonly uses AMS 2631 tolerances).

Delivery Condition: Must be written in capital letters, for example:

Annealed

Solution Treated and Aged

3. Core Performance Requirements (Technical Agreement Core):

Mechanical Properties: Based on the selected condition, clearly specify the minimum guaranteed values ​​for tensile/yield strength. For the aged condition, an additional "Fracture Toughness (K₁C) Test Report" may be required.

Ultrasonic Testing: Must be required. Example clause: "The bars must undergo 100% longitudinal ultrasonic testing, with acceptance criteria according to AMS 2631, Class A or a level agreed upon by both parties."

4. Special Requirements:

Low Interstitial Elements (ELI) Grade: If used for critical welded parts or ultra-high toughness requirements, you can specify the ELI grade with "oxygen content ≤ 0.13%".

Microstructure Requirements: Control of β grain size or α phase morphology (e.g., "duplex microstructure") may be required.

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Processing difficulty and key points

(Understanding the quotation and delivery time)

Titanium 6Al-6V-2Sn alloy bars are a difficult material to machine due to their high strength and poor thermal conductivity. This leads to rapid tool wear and severe work hardening. Specialized titanium alloy cutting tools, low cutting speeds, and high-volume cooling are necessary.

Heat Treatment is Critical for Performance:

Solution treatment temperature (approximately 900-950°C) and aging temperature (approximately 480-590°C) must be precisely controlled, and the cooling rate (water quenching or air cooling) directly affects the microstructure and properties. Suppliers must have vacuum or protective atmosphere heat treatment capabilities.

Welding Requires Strict Process Control:

Weldable, but high-purity shielding gas (such as argon) must be used, and post-weld heat treatment (PWHT) is usually required to restore properties and relieve stress.

One-Stop Service Recommendation:

If your parts require "forging + heat treatment" to achieve optimal performance, it is strongly recommended to purchase "finished forged blanks" directly from a professional titanium alloy forging plant with both forging and heat treatment capabilities, rather than buying bar stock and outsourcing the forging process.

For more information, please contact:

 Email: susan@lorkgroup.com
 WhatsApp: +86 19937075488

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