RAYCHIN LIMITED

Titanium Flat Head Screws – Comprehensive Product Range

Critical Applications of Titanium Flat Head Screws

International Standards & Global Designations – Titanium Flat Head Screws

RAYCHIN LIMITED manufactures titanium flat head screws 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 flat head screws 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)

Source: ASTM B348 / F467

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

Source: ASTM F468 / B348

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

Source: ASTM F136 / F467

Metallurgical note: Titanium alloys are lightweight metals with density approximately 4.43-4.51 g/cm³ – about 40% 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 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 . Titanium is completely non-magnetic (0 flux density) and exhibits minimal gas discharge, making it ideal for semiconductor and medical imaging applications .

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

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

Mechanical Properties – Titanium Alloys (Annealed Condition)

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 Flat Head Screws

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 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 . 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 Flat Head Screws

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.
• 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 Flat Head Screws

All titanium flat head screws are manufactured and tested to meet the following standards:

We offer surface finishes: plain (as-machined), passivated, anodized (blue, gold, purple, red), and PTFE-coated for enhanced lubricity. Special chemical polishing and brightening treatments ensure oil and dust do not adhere to surfaces, with minimal gas discharge . Controlled annealing processes per ASTM specifications ensure consistent mechanical properties. Specialized CNC heading, thread rolling, and precision machining for accurate flat head geometry with precise countersink angles per ISO, DIN, and NAS standards. Class 2A/3A/6g thread fit. 100% inspection available including dimensional inspection, thread verification, 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.