Aluminum Materials Used in Rail Transportation
Aluminum alloys have become one of the key material systems enabling lightweight and high-efficiency development in the rail transit sector, due to its low density, high specific strength, excellent corrosion resistance, and good formability and weldability.
In modern railway and urban rail transit systems, the application of aluminum alloys has expanded from traditional vehicle body structures to multiple critical subsystems. In terms of vehicle body structures, aluminum alloys are widely used in high-speed trains, metro systems, and light rail vehicles for carbody frames, skins, and overall load-bearing structures, achieving weight reduction and energy efficiency improvement.
In the running gear domain, aluminum alloys are increasingly adopted for certain non-load-bearing or secondary load-bearing components, such as bogie housings, protective structures, and auxiliary support parts. In onboard electrical and mechanical equipment, aluminum alloys are used in electrical cabinets, control enclosures, and heat dissipation structures to enhance system integration and thermal management performance.
In addition, in rail infrastructure and battlefield-related facilities (such as temporary tracks, rapidly deployable structures, and military transport systems), aluminum alloys are valued for their ease of assembly and mobility. In rail power supply systems, aluminum alloys are widely used in overhead contact system components, support structures, and conductive or heat-dissipating parts to improve electrical efficiency and structural reliability.
Meanwhile, in onboard lithium battery and energy storage systems, aluminum alloys are used for battery enclosures, module structures, and thermal management housings, ensuring safety while improving overall lightweight design and thermal stability. In summary, aluminum alloys have become a fundamental material base supporting the lightweight and multifunctional development of rail transit equipment.
In the following sections, we will break down these applications one by one and provide a detailed explanation of their specific use cases and material requirements.
1. Car Body Structure Series
The core load-bearing and forming material for the entire rail transit vehicle, focusing on light weight, high weldability, structural durability, and corrosion resistance to in-vehicle environments, serving as the core carrier for vehicle weight reduction and energy saving.
Common Grades
6005A-T6, 5083-O/H111, 6061-T6, 7020-T6, 5052
Typical Application Parts
Main car body structure (roof, side wall, end wall, underframe girder), streamlined head shell, carriage interior panel, floor profile, door and window frame, seat frame, luggage rack base, carriage connecting plate, head closure skin
Detailed Explanation about Alloy Grades
1. 6005A-T6: Excellent extrusion performance, capable of forming large-section complex hollow car body profiles, low strength loss after welding, balanced corrosion resistance, the main structural material for high-speed rail and urban rail car bodies.
2. 5083-O/H111: Core grade of anti-rust aluminum, resistant to moisture, acid and alkali corrosion, excellent plasticity for easy bending and stamping, stable welding performance, suitable for carriage skin, closures, and exposed structural parts.
3. 6061-T6: Balanced comprehensive mechanical properties, easy machining and anodizing, cost-effective, suitable for door and window frames, interior frameworks, and small load-bearing connectors.
4. 7020-T6: Ultra-high strength and toughness aluminum alloy, outstanding fatigue and impact resistance, suitable for key stressed joints and heavy-duty load-bearing structural parts of the car body, withstands alternating loads during vehicle start-stop.
5. 5052: Lightweight, anti-rust, good formability, controllable cost, suitable for non-load-bearing interior panels, ventilation covers, and decorative skins.
2. Bogie / Chassis Running Parts Series
Material for the core components with the most severe stress on the entire vehicle, focusing on ultra-high strength, fatigue resistance, impact resistance, resistance to harsh outdoor working conditions, and strong dimensional stability, ensuring driving safety and service life.
Common Grades
7020-T6, 6082-T6, 6061-T6, 5083, 2A12 (2124)
Typical Application Parts
Bogie frame, load-bearing crossbeam, axle box cover, gearbox housing, brake cylinder body, suspension support, air spring support seat, wheel hub, brake pedal bracket, chassis protective plate
Detailed Explanation about Alloy Grades
1. 7020-T6: High strength and toughness, industry-leading fatigue resistance, can withstand long-term high-frequency vibration and impact loads, the preferred grade for bogie core structures.
2. 6082-T6: Medium-high strength extrusion alloy, good section bending resistance stability, high machining precision, suitable for bogie profiles and various load-bearing support crossbeams.
3. 6061-T6: Excellent casting and machining properties, strong dimensional stability, suitable for gearbox housings, brake cylinder bodies, and various precision installation brackets.
4. 5083: Resistant to salt spray, rain and snow corrosion, suitable for chassis external protective plates and outdoor shielding parts, no rust or cracking in harsh outdoor environments.
5. 2A12: Ultra-high strength duralumin, excellent forging performance, high rigidity, suitable for wheel hubs and heavy-duty load-bearing forgings, withstands wheel set pressure and high-speed operation loads.
3. Vehicle-mounted Electromechanical Equipment Series
Supporting materials for train-mounted electrical, HVAC and fluid systems, focusing on light weight, easy forming, thermal and electrical conductivity, structural rigidity, corrosion resistance, and easy assembly.
Common Grades
6063-T5, 6061-T6, 5052, 6005, 1060 Pure Aluminum
Typical Application Parts
Cable tray, electrical trunking, traction inverter shell, converter housing, heat sink, air conditioning duct, cooling pipeline, electrical cabinet frame, ventilation cover, equipment installation bracket
Detailed Explanation about Alloy Grades
1. 6063-T5: Excellent extrusion formability, regular section, smooth surface, easy anodizing treatment, suitable for trunking, cable trays, air conditioning ducts, and decorative structural parts.
2. 6061-T6: Sufficient structural rigidity, good electromagnetic shielding performance, high machining precision, suitable for electrical equipment shells, cabinet frames, and high-voltage installation structures.
3. 1060 Pure Aluminum: Optimal electrical and thermal conductivity, excellent plasticity, specially used for heat sinks, cooling pipelines, and conductive connecting components.
4. 5052: Light, thin, easy to stamp and form, stable corrosion resistance, suitable for electrical covers, ventilation baffles, and external protective plates.
5. 6005: Medium strength extrusion profile, balancing light weight and load-bearing capacity, suitable for medium load equipment support beams and installation brackets.
4. Track Line & Station Facility Series
Outdoor structural materials for track lines, platforms and station yards, focusing on outdoor weather resistance, high bending resistance, corrosion resistance, easy assembly, long service life and maintenance-free.
Common Grades
6061-T6, 6063-T5, 6082-T6, 5083-H111
Typical Application Parts
Straddle-type monorail track beam, line support crossbeam, column bracket, platform slab, stair step, platform guardrail, canopy frame, station advertising frame, line auxiliary bracket
Detailed Explanation about Alloy Grades
1. 6061-T6: Excellent outdoor weather resistance, firm welding, moderate strength, suitable for track support structures, platform slabs, canopy main frames, no deformation after long-term outdoor exposure.
2. 6063-T5: Good surface texture, convenient cutting and assembly, balancing structure and aesthetics, suitable for guardrails, handrails, station decorative profiles, and advertising frames.
3. 6082-T6: Strong bending bearing capacity, good stability of large-section structures, suitable for monorail track beams and long-span support crossbeams, withstands train passing loads.
4. 5083-H111: High anti-rust performance, resistant to acid rain and coastal salt spray corrosion, suitable for coastal intercity rail and outdoor line auxiliary components, maintenance-free for the entire life cycle.
5. Rail Power Supply System Series
Special materials for rail traction power supply and trackside power facilities, focusing on high conductivity, structural strength, outdoor corrosion resistance, light weight, and easy installation.
Common Grades
1060/1070 Pure Aluminum, 6101 T63, 6063-T5, 6061-T6, 5083
Typical Application Parts
Catenary cantilever, positioning pipe, support column, dropper accessory, traction substation aluminum busbar, conductive aluminum row, switch cabinet shell, cable bracket, power cross arm, third rail protective profile
Detailed Explanation about Alloy Grades
1. 1060/1070 Pure Aluminum, 6101: Industry-leading conductivity, low resistivity, low power transmission loss, specially used for busbars, conductive crossbeams, and core conductive components of catenary.
2. 6063-T5: Good extrusion formability, high section precision, lightweight and easy to install, suitable for catenary cantilevers, positioning pipes, and power cable brackets.
3. 6061-T6: Strong structural rigidity, wind load and deformation resistance, suitable for power supply columns, high-voltage cross arms, and power transformation equipment load-bearing frames.
4. 5083: Resistant to outdoor corrosion and salt spray aging, suitable for coastal elevated trackside power accessories, no rust failure after long-term outdoor use.
6. Vehicle-mounted Lithium Battery & Energy Storage System Series
Structural materials for rail transit lithium battery power packs and energy storage systems, focusing on light weight, high structural strength, thermal conductivity and heat dissipation, electromagnetic shielding, corrosion resistance, fire protection and protection.
Common Grades
6061-T6, 6063-T5, 5083-H111, 6082-T6, 7020-T6
Typical Application Parts
Power battery box shell, module load-bearing frame, heat dissipation tray, BMS mounting plate, high-voltage power distribution cabinet body, vehicle-mounted energy storage cabinet profile, battery pack protective cover
Detailed Explanation about Alloy Grades
1. 6061-T6: Balanced comprehensive performance, good thermal conductivity, stable welding, sufficient structural strength, the main material for battery box shells and module frames.
2. 6063-T5: Convenient extrusion forming, customizable sealed protective structure, outstanding light weight effect, suitable for energy storage cabinet profiles and protective frames.
3. 5083-H111: Corrosion resistant, vibration and deformation resistant, suitable for vehicle-mounted exposed battery protective structures, withstands driving bumps and humid environments.
4. 6082-T6: Strong bending and load-bearing capacity, suitable for large-capacity energy storage pack bases and heavy-duty battery installation crossbeams.
5. 7020-T6: Ultra-high strength and fatigue resistance, suitable for core load-bearing structures of power batteries and high-voltage cabinet reinforcement parts, ensuring battery structural safety during driving.