7150 T77511 Extruded Bar
7150-T77511 extruded bar is characterized by its high strength, high toughness, and excellent stress corrosion resistance. It has a higher processing complexity than common 7xxx series alloys (such as 7075), making it suitable for structural components under extreme conditions.
The 7150-T77511 extruded bar is an ultra-high-strength aluminum alloy specifically designed for critical aerospace applications. Through optimized special heat treatment, this material offers outstanding mechanical properties, corrosion resistance, and fatigue performance.
7150 belongs to the 7xxx series (Al-Zn-Mg-Cu) and is an enhanced derivative of 7050. Compared to 7075, it possesses ultra-high strength and higher fracture toughness.
The T77511 temper indicates a condition that has undergone solution heat treatment, stress relief, straightening, and then overaging (T77). This temper offers a balanced combination of mechanical strength and corrosion resistance.
7150 T77511 Extruded Bar Basic Product Information
Alloy Composition of 7150-T77511 Extruded Bar
Alloy designation: 7150 (corresponding UNS number A97150)
Typical Chemical Composition:
- Zn 6.4%, Mg 2.4%, Cu 2.2%, Zr 0.12% (Balance: Al)
- Impurity control: Fe and Si contents are strictly limited to ensure extruded surface quality and mechanical performance
| Element | % Composition | Role |
| Zn | 5.9–7.5 | Primary strength enhancer |
| Cu | 1.9–2.5 | Strengthening, fatigue resistance |
| Mg | 2.0–2.7 | Hardness and corrosion resistance |
| Zr | 0.08–0.15 | Grain refinement |
| Fe, Si | ≤0.15 each | Impurity control |
| Al | Balance | Base material |
7150 T77511 Extruded Bar Standard Extruded Bar Sizes (Inches):
| Thickness (T) | Width (W) | Standard Lengths |
| 0.50" | 1.00" – 6.00" | 12 ft, 20 ft |
| 0.75" | 2.00" – 8.00" | 12 ft, 20 ft |
| 1.00" | 3.00" – 12.00" | 12 ft, 20 ft |
| 1.50" | 4.00" – 15.00" | 12 ft, 20 ft |
| 2.00" | 6.00" – 18.00" | 12 ft, 20 ft |
| 2.50" | 8.00" – 24.00" | 12 ft, 20 ft |
| 3.00" | 10.00" – 36.00" | 12 ft, 20 ft |
Key Notes:
Size Availability:
Dimensions vary by manufacturer. Larger sizes (widths over 24 inches) may require customization.
Tolerances:
Compliant with AMS 4347 standard (thickness/width typically ±0.015 inches).
Equivalent Standards:
- UNS: A97150
- Europe: EN 5730-7150A
7150 T77511 Extruded Bar Production Standards and Certifications
Governed Standards:
- AMS 4345 (primary specification for T77511 temper)
- AMS 4325B (covers wide panel profiles)
- BMS-7-306, DMS-2256 (additional aerospace certifications)
Fully compliant with multiple aerospace specifications: AMS 4307 (T61511), AMS 4325 (T77511 wide profiles), AMS 4345 (T77511 profiles).
Original equipment manufacturers such as Boeing procure it under proprietary designations like BAC1506-2002.
7150 T77511 Extruded Bar Corrosion Resistance
The T77 temper offers excellent exfoliation and stress corrosion resistance, significantly superior to the T6 temper and comparable to stress corrosion-resistant alloys.
Heat Treatment Temper (T77511)
This temper includes the following key process steps:
- Solution Heat Treatment: High-temperature solution treatment ensures complete dissolution of strengthening phases (e.g., η-MgZn₂, S-Al₂CuMg).
- Stress Relief: Residual stress is reduced through pre-stretching or mechanical straightening.
- Straightening: Ensures material straightness (typical requirement ≤0.5mm/m).
- Overaging (T77 Temper): Multi-step aging (e.g., staged holding at 110°C + 155°C) to balance strength and stress corrosion resistance.
7150 T77511 Bar Extrusion Process Characteristics
Cross-Section Range: Suitable for large-size extrusions, cross-sectional area 90–194 cm² (corresponding to circumscribed diameters of 356–559 mm).
Process Challenges:
- Requires strict control of extrusion temperature (billet at 420–440°C) and speed (3–5 m/min) to suppress cracking.
- In forward extrusion, optimized die design is required to achieve in-line solution heat treatment (465–485°C) and water quenching.
7150 T77511 Extruded Bar Product Features and Advantages
- High strength and ultra-hard characteristics
- Excellent high-temperature performance
- Superior corrosion resistance
- Good machinability
| Property Category | Description |
| Strength-to-Weight Ratio | Approximately 10–15% stronger than 7075-T6511, enhancing structural load-bearing capacity while maintaining low weight, ideal for aerospace and other high-performance weight-sensitive applications. |
| Corrosion Resistance | T77511 temper undergoes overaging treatment, significantly improving resistance to exfoliation corrosion and stress corrosion cracking (SCC), suitable for structural use in humid or corrosive environments. |
| Fatigue Strength | Exhibits excellent high-cycle fatigue strength, significantly extending the service life of components under cyclic dynamic loads, enhancing overall reliability and safety. |
7150 T77511 Extruded Bar Mechanical and Physical Properties
| Performance Index | Typical Value/Characteristic | Reference Standard |
| Tensile Strength | ≥524 MPa (reference for similar 7xxx alloys) | AMS 4325-2003 |
| Hardness | HB 160–175 (T6 temper reference) | - |
| Corrosion Resistance | Significantly superior to T6 temper (advantage of T77 treatment) | - |
| Fatigue Performance | High fatigue resistance, suitable for aerospace dynamic load components | - |
7150 T77511 Extruded Bar Applications and Case Studies
- Aerospace: Fuselage frames, wing spars, high-strength fasteners.
- Transportation: Load-bearing structures of high-speed trains, armor components.
- Industrial Equipment: Molding tools, high-pressure hydraulic components.
Applications in the Aerospace Sector
In the aerospace field, 7150 T77511 extruded bars are widely used due to their excellent specific strength and fatigue resistance:
- Primary structural components of aircraft: such as main spars, wing spars, floor beams, landing gear bay frames, etc.
- Landing gear components: requiring high load-bearing and impact strength.
Applications in the Automotive Industry
Although aerospace is the primary application field, with the automotive industry trending toward lightweighting, 7150 T77511 is gradually being adopted in high-end automotive manufacturing, especially in racing cars, supercars, and specialty vehicles:
- Suspension system parts: such as control arms and steering knuckles, emphasizing strength and weight reduction.
- Chassis connectors: requiring high fatigue resistance and rigidity.
- Reinforced body components: such as crash beams and A/B pillar reinforcements.
- Particularly in F1 racing or high-performance sports cars, the use of 7150 material significantly enhances acceleration and handling performance.
What Other Industries Use This Material?
Rail Transit
Structural connectors for high-speed trains.
Reinforced beams in car bodies, especially in stress-concentrated areas.
Mold Manufacturing
Precision mold frames/skeletons for producing carbon fiber parts or hot-press molds.
Sports Equipment and Special Machinery
High-end mountain bike frame joints.
Structural frames for special engineering equipment, such as robotic arms.
7150 T77511 Extruded Bar Heat Treatment Process
The T77511 tempering process includes:
- Solution Treatment: Heating to 480°C to fully dissolve alloying elements.
- Quenching: Rapid cooling to lock in the supersaturated state (risk: residual stress).
- Artificial Aging: Controlled overaging at specific temperatures to enhance stress corrosion cracking resistance and dimensional stability.
7150 T77511 Extruded Bar Comparison with Competing Alloys
| Alloy / Property | Tensile Strength (MPa) | SCC Resistance<sup>1</sup> | Key Advantage |
| 7150-T77511 | 560–620 | Excellent | Optimized balance of strength and corrosion resistance |
| 7050-T7451 | 510–550 | Good | Lower cost, established aerospace use |
| 7449-T7951 | 580–630 | Outstanding | Superior corrosion resistance in thick sections |
Performance Notes:
SCC Resistance Scale:
- Outstanding: Immune to stress corrosion cracking in severe environments
- Excellent: High resistance (threshold stress > 75% YS)
- Good: Moderate resistance (threshold stress 50–75% YS)
Strength Context:
7150 offers ~10% higher strength than 7050-T7451
Industry Positioning:
- 7150: Preferred for primary structures requiring strength-corrosion balance
- 7449: Dominates naval/marine aerospace components
Key Technical Takeaways:
- 7150 vs. 7050: 7150 provides 12–15% greater yield strength with equal formability
- 7150 vs. 7449: 7449 has better exfoliation resistance but 7150 has lower quench sensitivity
7150 T77511 Extruded Bar Manufacturing Notes
To ensure dimensional accuracy after extrusion, straightening and stress relief through stretching are crucial.
Weldability is generally poor, requiring special techniques (such as friction stir welding) and pre-/post-treatment to avoid corrosion and strength degradation.
Typical cross-sectional dimensions: as small as a few millimeters; maximum standard length is about 6 meters, with custom orders up to 28 meters long.
Why Choose 7150-T77511?
- Ultra-high strength
- Excellent fracture toughness and fatigue resistance
- Outstanding corrosion and stress corrosion resistance in harsh environments
- Aerospace quality certifications, trusted by major original equipment manufacturers (OEMs)
- Ideal for critical load-bearing components in aircraft, spacecraft, and high-performance rail systems.
7150 T77511 Extruded Bar Procurement and Handling Guidelines
- Certification: Ensure compliance with AMS 4345 standards and provide mill test reports.
- Machining: Use high-speed steel tools with proper lubrication to manage hardness.
- Storage: Control humidity to prevent oxidation; avoid mechanical damage during transportation.
The 7150 T77511 extruded bar represents advanced aluminum metallurgy, combining ultra-high strength with excellent corrosion resistance. Despite the emergence of new high-performance alloys, its dominant position in aerospace structural components highlights its proven reliability.
