RAYCHIN LIMITED

Titanium Shoulder Bolts – Comprehensive Product Range

Critical Applications of Titanium Shoulder Bolts

International Standards & Global Designations – Titanium Shoulder Bolts

RAYCHIN LIMITED manufactures titanium shoulder bolts 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 shoulder bolts are produced from vacuum arc remelted (VAR) or plasma arc melted material conforming to the limits of applicable ASTM and AMS standards.

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

Grade 2 Titanium (CP-Ti) – UNS R50400

Grade 23 Titanium (Ti-6Al-4V ELI) – UNS R56401

Metallurgical note: Titanium alloys are lightweight metals with a density of approximately 4.43-4.51 g/cm³ – about 40% lighter than steel while offering comparable 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 excellent corrosion resistance and formability, ideal for marine and chemical applications . Grade 23 ELI (Extra Low Interstitial) is a special version of Ti-6Al-4V with reduced interstitial elements (oxygen, nitrogen, carbon) providing enhanced ductility and fracture toughness for medical implant applications . 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 .

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

Titanium shoulder bolts are supplied in annealed condition or solution-treated and aged condition per applicable ASTM and AMS specifications. Data represent typical values based on industry standards.

Mechanical Properties – Titanium Alloys

Physical Properties – Titanium Alloys

High-Temperature Mechanical Properties – Ti-6Al-4V

Note: High-temperature properties are for short-term exposure. For long-term service, titanium alloys are typically limited to 300-400°C due to oxidation and microstructural stability.

High‑Temperature Performance of Titanium Shoulder Bolts

Titanium alloys maintain useful mechanical properties at elevated temperatures, though their application is limited by oxidation resistance and microstructural stability. Grade 5 (Ti-6Al-4V) retains significant strength up to 400-500°C (750-930°F) for short-term exposure, making it suitable for aerospace and automotive components subject to moderate heat . At 400°C, Ti-6Al-4V maintains approximately 75% of its room temperature tensile strength. However, prolonged exposure above 300-400°C can lead to oxidation and formation of an oxygen-enriched brittle alpha-case layer that degrades fatigue resistance and ductility . For applications requiring sustained high-temperature performance in oxidizing environments, titanium alloys may require protective coatings such as TiAlN to enhance oxidation resistance . Aerospace specifications classify titanium shoulder bolts for applications up to 315°C (600°F) with appropriate surface treatments and MoS2 dry film coating . Grade 2 commercially pure titanium has lower high-temperature strength and is typically limited to applications below 300°C .

Elevated Temperature Capabilities

Exceptional Corrosion Resistance of Titanium Shoulder Bolts

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), 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, making it ideal for marine and offshore applications .

Corrosion Resistance to Common Media

• Corrosion Resistance: Titanium offers exceptional resistance to seawater, salt spray, chlorides, nitric acid, and oxidizing environments . In salt spray testing, titanium corrodes at rates <0.01 mm/year – significantly outperforming stainless steel .
• Pitting & Crevice Corrosion: Titanium is virtually immune to pitting and crevice corrosion in chloride environments, making it ideal for marine and chemical processing applications .
• Stress Corrosion Cracking: Titanium alloys exhibit excellent resistance to stress corrosion cracking in most environments, though certain alloys may be susceptible in specific conditions .
• 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 .
• Acid Resistance: Titanium has excellent resistance to nitric acid and oxidizing acids but limited resistance to reducing acids like hydrochloric and sulfuric acid .

Manufacturing Standards – Titanium Shoulder Bolts

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

We offer surface finishes: plain (as-machined), anodized (blue, gold, purple, red, black), PVD coated (TiN, CrN, AlTiN), mirror polished (Ra ≤ 0.2 µm), and matte sandblasted . Controlled heat treatment processes per ASTM and AMS specifications ensure consistent mechanical properties. Shoulder bolts are manufactured with precision-ground shoulders to tight diametrical tolerances (h8/h9 standard, custom tolerances available down to ±0.0005"). Specialized CNC turning, thread rolling, and centerless grinding ensure accurate geometry per ASME, ISO, DIN, and NAS standards. Class 2A/3A/6g thread fit. 100% inspection available including dimensional inspection, hardness testing, and non-destructive examination. Full traceability and material test reports (MTR) available with EN 10204 3.1 certification. 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.