RAYCHIN LIMITED

Titanium Nuts – Comprehensive Product Range

International Standards & Global Designations – Titanium Nuts

RAYCHIN LIMITED manufactures titanium nuts 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 nuts 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 23 ELI (Ti-6Al-4V ELI) – UNS R56401

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 and exhibits minimal gas discharge, making it ideal for semiconductor and medical imaging applications. When installing titanium nuts, apply a small amount of anti-seize on threads 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 nuts are supplied in annealed condition per applicable ASTM specifications. Data represent typical values based on industry standards. Proof stress testing per ASTM F467 ensures compliance with specified strength requirements.

Mechanical Properties – Titanium Alloys (Annealed Condition)

Physical Properties – Titanium Alloys

High-Temperature & Cryogenic Mechanical Properties – Grade 5 Titanium

Maximum continuous service temperature: Grade 5 – 400°C (750°F); Grade 2 – 300°C (570°F). Lock nuts with nylon inserts limited to 120°C; all-metal lock nuts rated to 350°C. At temperatures above 900°C, protective coatings such as TiAlN are required to prevent oxidation and alpha-case formation.

Exceptional Corrosion Resistance of Titanium Nuts

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 Comparison – Titanium vs. 316 Stainless Steel

◎: Corrosion resistant enough for use. ○: Corrosive but usable depending on conditions. ×: Unusable.

• 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. Zero pitting after 20 years in 3.5% salt spray testing.
• 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.
• Non-Magnetic: Completely non-magnetic (0 flux density) – ideal for MRI environments, avionics, and precision instrumentation.

Manufacturing Standards – Titanium Nuts

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

We offer surface finishes: plain (as-machined), passivated, anodized (blue, gold, purple, red, black, burnt), DLC black, PTFE-coated, and MoS₂ dry film coating. Controlled annealing processes per ASTM specifications ensure consistent mechanical properties. Each batch of titanium nuts ships with EN 10204 3.1 chemical and mechanical test reports. EN 10204 3.2 or third-party inspections (SGS/TÜV) available upon request. All finished products undergo ultrasonic testing, Rockwell hardness checks, and thread gauge inspection. Lock and flange nuts pass ISO 2320 reuse testing – retain ≥ 80% preload after 30 assemblies. 100% inspection available including dimensional inspection, proof load testing, and non-destructive examination. 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.