RAYCHIN LIMITED

Titanium Washers – Comprehensive Product Range

International Standards & Global Designations – Titanium Washers

RAYCHIN LIMITED manufactures titanium washers from vacuum arc remelted (VAR) or plasma arc melted material conforming to the most widely used national and international specifications. All material is traceable to the mill with complete certifications.

Chemical Composition (Weight %) – Titanium Alloys

Our titanium washers are produced from vacuum arc remelted (VAR) or plasma arc melted material conforming to the limits of applicable ASTM and AMS standards.

Commercially Pure Grades (ASTM F467 / B348)

Grade 5 Titanium (Ti-6Al-4V) – UNS R56400

Grade 7 Titanium (Ti-Pd) – UNS R52400

Metallurgical note: Titanium alloys are lightweight metals with density approximately 4.43-4.51 g/cm³ – about 45% lighter than steel while offering comparable or superior strength. Grade 5 (Ti-6Al-4V) is an alpha-beta alloy strengthened through a combination of aluminum (alpha stabilizer) and vanadium (beta stabilizer), providing excellent strength, fatigue resistance, and corrosion resistance. Grade 2 is commercially pure titanium with exceptional corrosion resistance and formability, ideal for marine and chemical applications. Grade 7 contains palladium additions (0.12-0.25%) that significantly enhance corrosion resistance in reducing acids and crevice conditions. All titanium alloys exhibit exceptional corrosion resistance due to the formation of a stable, self-healing oxide layer (TiO₂) that provides protection in seawater, acids, and oxidizing environments. Titanium is completely non-magnetic (magnetic permeability <1.02) and exhibits minimal gas discharge, making it ideal for semiconductor and medical imaging applications. When using titanium washers in conjunction with stainless steel or aluminum components, consider adding a dry film lubricant or anti-seize compound to prevent galling – a common issue due to titanium's tendency to cold-weld under high pressure.

Complete Mechanical & Physical Properties – Titanium Alloys (MPa / ksi)

Titanium washers are supplied in annealed condition per applicable ASTM specifications. Data represent typical values based on industry standards.

Mechanical Properties – Titanium Alloys (Annealed Condition)

Note: Grade 5 titanium is 4 times stronger than 316 stainless steel at nearly half the weight.

Physical Properties – Titanium Alloys

High-Temperature Mechanical Properties – Grade 5 Titanium

Maximum continuous service temperature: Grade 5 – 370°C (700°F); Grade 2 – 260°C (500°F). At temperatures above 900°C, protective coatings such as TiAlN are required to prevent oxidation and alpha-case formation.

Exceptional Corrosion Resistance of Titanium Washers

Titanium alloys are renowned for their outstanding corrosion resistance, often outperforming stainless steel in aggressive environments. The material forms a stable, adherent, and self-healing oxide layer (TiO₂) that provides protection against a wide range of corrosive media. In salt spray testing (10% NaCl, 35°C), titanium exhibits corrosion rates less than 0.01 mm/year, compared to 0.1 mm/year for 304 stainless steel. Titanium is virtually immune to seawater corrosion up to 260°C (500°F) and can survive at ocean depths over a mile below the surface.

Corrosion Resistance to Common Media

• Seawater Resistance: Titanium is virtually immune to seawater corrosion up to 260°C (500°F) and at depths exceeding one mile, making it ideal for marine and offshore applications.
• Chlorine & Bleach Processing: Titanium is fully resistant to wet chlorine, chlorides, hypochlorites, chlorates, perchlorates, and chlorine dioxide – unique among metals. Widely used in pulp & paper and chlor-alkali industries.
• Pitting & Crevice Corrosion: Titanium is virtually immune to pitting corrosion in chloride environments, but at temperatures >80°C in crevice conditions, palladium-stabilized grades (Grade 7) are recommended.
• Stress Corrosion Cracking: Titanium alloys exhibit excellent resistance to stress corrosion cracking in most environments.
• Biocompatibility: Titanium is fully biocompatible, non-toxic, and does not elicit adverse tissue reactions, making it ideal for medical implants and surgical instruments.
• Galvanic Corrosion: Titanium is more noble than aluminum and steel but may experience galvanic corrosion when coupled with dissimilar metals. Appropriate isolation or coating may be required.
• High-Temperature Protection: At temperatures above 900°C, protective coatings such as TiAlN are required to prevent rapid oxidation and alpha-case formation.

Manufacturing Standards – Titanium Washers

All titanium washers are manufactured and tested to meet the following standards:

We offer surface finishes: plain (as-stamped), passivated, anodized (blue, gold, purple, red, black), PTFE-coated (anti-galling), and DLC (low friction). Controlled annealing processes per ASTM specifications ensure consistent mechanical properties. Precision stamping, laser cutting, and CNC machining for accurate washer geometry with controlled flatness and parallelism. Thickness tolerances as tight as ±0.02 mm for precision shims. 100% inspection available including dimensional inspection, hardness testing, and non-destructive examination. Full traceability and material test reports (MTR) with mill certifications available. AS9100 and ISO 9001:2015 certified quality management. ISO 13485 certified for medical applications with cleanroom packaging available. Build-to-print specials to customer specifications are available.