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Titanium and titanium alloy rods are widely used in aerospace, medical, chemical and other fields due to their excellent properties such as low density, high strength and corrosion resistance. The following is a detailed introduction to its classification, grades and application fields:

Classification

Titanium and titanium alloy rods are usually classified based on chemical composition, microstructure type or performance characteristics. Common classification methods are as follows:

1. Classify by organizational type

α -type titanium alloy

It mainly contains α -stabilizing elements (such as aluminum, tin, etc.), and has a single-phase α structure at room temperature. It has medium strength and excellent weldability and corrosion resistance.

α+β type titanium alloy

It contains α -stabilizing elements and β -stabilizing elements (such as vanadium, molybdenum, etc.), and has an α+β duplex structure at room temperature. It features high strength and good plasticity, and can be strengthened through heat treatment.

β -type titanium alloy

It mainly contains β -stabilizing elements (such as molybdenum, niobium, titanium, etc.). At room temperature, it has a single-phase β structure. Its strength can be significantly enhanced through solution treatment and aging treatment. It has good processability but slightly weaker corrosion resistance.

2. Classify by purpose

Industrial pure titanium rods

It has a relatively high purity (with a titanium content of over 99%), low strength but excellent plasticity and corrosion resistance, and is often used in fields such as chemical engineering and Marine engineering.

Structural titanium alloy bar

Structural components used to bear loads, such as fuselage frames and engine parts in aerospace, require high strength and lightweight.

Corrosion-resistant titanium alloy rods

It focuses on enhancing corrosion resistance and is suitable for highly corrosive environments such as chemical engineering, metallurgy, and seawater treatment.

High-temperature titanium alloy bar

It can work for a long time at relatively high temperatures (such as above 500℃) and is used for high-temperature components of aero engines.

Medical titanium alloy rod

It has biocompatibility and resistance to body fluid corrosion, and is used in medical implants such as artificial joints and dental implants.

Application field

1. Aerospace field

Core requirements: Lightweight, high strength, fatigue resistance, high-temperature resistance and complex stress environment resistance

1. Engine system

Application scenarios: Compressor blades, turbine discs, combustion chamber components, engine casings

Execution standard

China: GB/T 2965 "Titanium and Titanium Alloy Bars", GJB 2218A "Specification for Titanium Alloy Bars"

International: ASTM B348 (General Requirements for Titanium Bars), AMS 4928 (Ti-6Al-4V bars)

Typical grades

TC11 (Ti-6Al-3.5Mo-1.5Zr-0.3Si) : It is used for high-temperature blades below 500℃ and has better oxidation resistance than TC4

TA15 (Ti-6Al-2Zr-1Mo-1V) : Good weldability, used for the welded structure of engine casings

2. Body structure

Application scenarios: landing gear, wing beams, spacers, fasteners (bolts/rivets)

Execution standard

China: HB 5492 "Titanium Alloy Bars"

International: AMS 4965 (Ti-10V-2Fe-3Al High Strength Bar)

Typical grades

TC4 (Ti-6Al-4V) : It accounts for over 50% of the titanium alloy usage in aviation and is used in landing gear forgings

TB6 (Ti-10V-2Fe-3Al) : Ultra-high strength β titanium alloy, used for main load-bearing bolts

3. Missiles and Spacecraft

Application scenarios: Missile casings, rocket engine nozzles, satellite brackets

Execution standard

China: Q/3B 4085 (Titanium Alloy bar for aerospace)

Typical grades

TA7ELI (Ti-5Al-2.5Sn low clearance) : Resistant to low temperatures up to -253 ℃, used for liquid hydrogen fuel storage tank brackets

2. Medical implant field

Core requirements: Biocompatibility (non-toxic and non-allergenic), resistance to body fluid corrosion, and mechanical properties matching bone tissue

Artificial joint

Application scenarios: hip joint prostheses, knee joint prostheses, shoulder joint prostheses

Execution standard

China: GB/T 13810 "Titanium and Titanium Alloy Processing Materials for Surgical Implants", YY/T 0605 "Titanium and Titanium Alloy Bars for Surgical Implants"

International: ASTM F136 (Ti-6Al-4V ELI standard for surgical implants), ISO 5832-3

Typical grades

TA28 (Ti-6Al-4V ELI) : Low-gap elements (O, N, C), reducing the precipitation of metal ions

TA29 (Ti-6Al-7Nb) : Vanadium-free design, suitable for patients sensitive to vanadium

2. Orthopedic internal fixation instruments

Application scenarios: Bone nails, bone plates, spinal fusion devices

Execution standard

China: GB/T 23102 "Titanium and Titanium Alloy Processing Rods for Surgical Implants"

Typical grades

TC4 ELI (Ti-6Al-4V ELI) : Its strength is close to that of cortical bone and it is used for load-bearing bone screws

3. Dental implants

Application scenarios: Dental implant abutments, denture brackets

Execution standard

International: ISO 14801 (Titanium and Titanium Alloys for Dental Implant Abutments)

Typical grades

Industrial pure titanium TA4 (Grade 4) : Its surface is prone to oxidation to form a bioactive TiO₂ layer, which promotes bone bonding

3. Chemical engineering and Marine engineering fields

Core requirements: Resistance to acid and alkali corrosion, resistance to electrochemical corrosion of seawater, and resistance to stress corrosion cracking

1. Chemical equipment

Application scenarios: Electrolytic cells in chlor-alkali industry, urea synthesis towers, petrochemical reaction vessels

Execution standard

China: GB/T 13810 (Titanium bars for Chemical Industry), HG/T 2737 "Titanium and Titanium Alloy Bars for Titanium Equipment"

Typical grades

TA1 (Grade 1) : Purity 99.5%, used for heat exchanger tube bundles in dilute sulfuric acid and hydrochloric acid environments

TA9 (Ti-0.2Pd) : Palladium is added to enhance crevice corrosion resistance and is used in chemical media containing chloride ions

2. Marine engineering

Application scenarios: Seawater desalination equipment (distillation towers, condenser tubes), offshore platform bolts, ship propulsion shafts

Execution standard

International: ASTM B381 (Specification for Titanium Rods for Marine Use)

Typical grades

TA2 (Grade 2) : Resistant to seawater pitting corrosion, used for seawater pipe flanges

TC4 (Ti-6Al-4V) : Resistant to Marine atmospheric corrosion, used for fasteners on offshore platforms

4. Energy and power sector

Core requirements: High-temperature and high-pressure resistance, resistance to fluid erosion, and radiation resistance (in nuclear power scenarios)

1. Nuclear power industry

Application scenarios: Heat transfer tubes of steam generators for pressurized water reactors, inner linings of containment vessels

Execution standard

China: NB/T 20002.3 "Titanium and Titanium Alloy Bars for Nuclear Power Plants"

Typical grades

TA10 (Ti-0.3Mo-0.8Ni) : Resistant to chloride ion stress corrosion, used in the circulating water system of nuclear power plants

2. Oil and Gas

Application scenarios: Deep-sea oil and gas well casing, shale gas extraction fracturing equipment

Execution standard

International: API Spec 5L (Specification for pipeline tubes, titanium alloy optional)

Typical grades

TC4 (Ti-6Al-4V) : Resistant to H₂S corrosion, used for downhole tools in sulfur-containing oil and gas fields

5. High-end manufacturing and consumer goods sector

Core requirements: Lightweight, surface treatment performance (such as anodic oxidation coloring), processing accuracy

Sports equipment

Application scenarios: Racing bicycle frames (road bikes/mountain bikes), golf club heads, snowboard bindings

Execution standard

Enterprise standards: such as the Shimano bicycle titanium alloy component standard

Typical grades

TC4 (Ti-6Al-4V) : High strength and lightweight are achieved through forging, and the weight of the bicycle frame can be less than 1kg

2. Consumer electronics

Application scenarios: High-end Watch cases (such as the titanium version of Apple Watch), hinges of foldable phones

Execution standard

Enterprise standards: such as the titanium alloy part of the Apple Material Specification (AMS)

Typical grades

Industrial pure titanium TA2 (Grade 2) : Surface anodizing can present colors such as deep space gray and is used for watch cases

Supplementary standards for special scenarios

High-temperature applications (≥500℃) : It must comply with the requirements for high-temperature alloys as stipulated in GB/T 15073 "Grades and Chemical Compositions of Cast Titanium and Titanium Alloys"

Low-temperature application (≤-196℃) : Refer to GJB 3317 "Specification for Titanium Alloy Bars for Low Temperature Use"

Food contact scenarios (such as pharmaceutical equipment) : It is required to pass the GB 4806.9 "National Food Safety Standard - Metal Materials and Articles for Food Contact" certification.