6061 Ultra Thick Aluminum Forging Plate

6061 aluminum alloy has high tensile strength and yield strength, as well as good elongation at break, exhibiting excellent comprehensive mechanical properties. Low density, with good lightweight properties. Has good plasticity and toughness, easy to process and shape. No stress corrosion cracking tendency, excellent weldability.

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1. Material Composition & Manufacturing Process

6061 aluminum alloy (ASTM B209, AMS 4025) is a heat-treatable Al-Mg-Si alloy engineered for versatility and excellent mechanical properties. Ultra-thick forged plate variants (>150mm) offer exceptional structural integrity through specialized manufacturing:

Alloy Chemistry:

Magnesium (Mg): 0.8-1.2% (Mg₂Si precipitation)

Silicon (Si): 0.4-0.8% (Mg₂Si formation)

Copper (Cu): 0.15-0.40% (strengthening)

Chromium (Cr): 0.04-0.35% (corrosion resistance)

Base Material:

Aluminum (Al): ≥97.5% (balance)

Controlled Impurities:

Iron (Fe): ≤0.7% max

Zinc (Zn): ≤0.25% max

Titanium (Ti): ≤0.15% max

Manganese (Mn): ≤0.15% max

Advanced Ultra-Thick Forging Process:

Ingot Casting: Premium double-degassed 7000-12000kg ingots

Pre-homogenization Inspection: Ultrasonic testing to Level A

Homogenization: 580-590°C for 24-36 hours (core temperature controlled)

Scalping: Surface machining to remove segregation zone

Preheating: Staged heating to 450-470°C with ±5°C uniformity

Open-Die Forging:

Multi-directional deformation

10,000-15,000 ton hydraulic press

Deformation ratio 3:1 minimum

Intermediate Annealing: 410°C for 6-8 hours when required

Solution Heat Treatment: 530-550°C for 2-5 hours (thickness dependent)

Precision Quenching: Polymer quench with controlled cooling rate 45-90°C/min

Straightening: Hydraulic press with distributed load

Artificial Aging: T6 or T651 temper at 170-190°C for 8-12 hours

Full quality documentation with melt-to-product traceability.

2. Mechanical Properties of Ultra-Thick Forged PlateProducts Description

Property	Minimum	Typical	Test Standard	Significance for Ultra-Thick Sections
Ultimate Tensile Strength	290 MPa	310-330 MPa	ASTM B557	Maintained through entire cross-section
Yield Strength (0.2% offset)	240 MPa	260-280 MPa	ASTM B557	Less than 10% variation core to surface
Elongation (2 inch)	8%	10-14%	ASTM B557	Critical for thick section ductility
Shear Strength	170 MPa	180-210 MPa	ASTM B769	Joint design parameter for bolted connections
Bearing Strength (e/D=2.0)	430 MPa	450-480 MPa	ASTM E238	Fastener hole performance
Fatigue Strength (10⁷)	95 MPa	100-120 MPa	ASTM E466	Long-term cyclic loading resistance
Hardness (Brinell)	95 HB	95-105 HB	ASTM E10	≤5% variation through thickness
Fracture Toughness (K₁C)	29 MPa√m	32-37 MPa√m	ASTM E399	Critical for damage tolerance
Through-Thickness Reduction	6% min	8-12%	ASTM E8	Z-direction ductility

Directionality (Typical Ratios):

L vs. LT: ≤1.05:1 tensile strength ratio

L vs. ST: ≤1.10:1 tensile strength ratio

Core vs. Surface: ≤1.08:1 yield strength ratio

3. Ultra-Thick Forging Microstructure ControlProducts Description

Thickness-Specific Processing:

Deformation Distribution:

Multi-axial forge compression

Minimum 25% reduction in final pass

Constant temperature control through section

Quench Rate Management:

Polymer concentration: 12-18%

Agitation velocity: 2.5-3.5 m/s

Temperature rise control: <15°C max

Thermal Gradient Mitigation:

Isothermal holds at critical temperatures

Core temperature monitoring during processing

Controlled cooling rate: 60-80°C/min surface, 40-55°C/min core

Microstructural Characteristics:

Grain Size: ASTM 4-6 (40-70μm)

Recrystallization: >85% recrystallized structure

Precipitate Distribution:

Primary Mg₂Si: 0.5-2μm

β" needles: 4-8nm in diameter

Q-phase and B'-phase controlled

Dispersoid Density: 1-3×10⁶/mm²

Texture: Modified cube with reduced anisotropy

Inclusion Rating: ≤0.5 per ASTM E45

Maximum Grain Size Variation: 2 ASTM numbers through thickness

4. Dimensional Specifications & Tolerances

Parameter	Standard Range	Precision Tolerance	Commercial Tolerance
Thickness	150-500 mm	±3 mm	±5 mm
Width	1000-3500 mm	±5 mm	±8 mm
Length	2000-12000 mm	+15/-0 mm	+25/-0 mm
Flatness	N/A	0.15% of length	0.30% of length
Parallelism	N/A	0.5% of thickness	1.0% of thickness
Edge Straightness	N/A	1 mm/1000 mm	2 mm/1000 mm
Surface Roughness	N/A	6.3 μm Ra max	12.5 μm Ra max

Specialized Parameters:

Machining Allowance: 15mm per side recommended

Stress Relief: Required before precision machining

Ultrasonic Testing: 100% volumetric inspection

Density: 2.70 g/cm³ (±0.01 g/cm³)

Weight Formula: Thickness(mm) × Width(m) × Length(m) × 2.70 = Weight(kg)

Maximum Single Piece Weight: 25,000 kg

5. Heat Treatment & Property Optimization

Temper Designation	Process	Applications	Key Properties
T651	Solution treated, stress relieved by stretching (1.5-3%), artificial aging	Primary aerospace, defense, moldmaking	Maximum strength with good stress corrosion resistance
T6511	Solution treated, stress relieved by stretching (controlled), artificially aged	Critical structural components, precision parts	Excellent dimensional stability with high strength
T6510	Solution treated, minimal stress relief, artificially aged	Complex geometries, bridge components	Balanced properties with minimized distortion
T73	Solution treated, overaged	High temperature service, stress corrosion critical applications	Superior stress corrosion resistance, thermal stability

Solution Heat Treatment Parameters:

Temperature: 530-550°C

Time: 25 min/inch of thickness (minimum 2 hours)

Temperature Uniformity: ±5°C maximum variation

Quenching Delay: <15 seconds maximum

Transfer Equipment: Specialized handling fixtures

Artificial Aging Options:

T6 Cycle: 175-185°C for 8-10 hours

T651 Cycle: 175-185°C for 6-8 hours

T73 Cycle: Dual stage (175°C/4hr + 215°C/8hr)

6. Machining & Fabrication Characteristics

Operation	Tool Material	Recommended Parameters	Notes for Ultra-Thick Plate
Heavy Milling	Carbide inserts	Vc=300-700 m/min, fz=0.15-0.25 mm	Climb milling preferred
Deep Hole Drilling	Carbide drills	Vc=60-120 m/min, fn=0.15-0.30 mm/rev	Peck cycle required
Boring	PCD tooling	Vc=500-1000 m/min	Dampened boring bars essential
Face Milling	Carbide face mills	Vc=350-800 m/min	High positive rake geometry
Tapping	HSS-E-PM taps	Vc=15-30 m/min	H-limits preferred
Sawing	Carbide-tipped	40-60 m/min, 2-3 teeth engaged	Flood cooling mandatory

Special Considerations:

Residual Stress Management: Release 75% of stock prior to final machining

Fixturing: Distributed clamping force to prevent distortion

Tool Engagement: Maximum 60% cutter diameter width of cut

Coolant: High-pressure (70+ bar) for deep features

Heavy Machining: Maximum 5mm depth of cut per pass

Heat Generation: Monitor workpiece temperature during machining

Chip Evacuation: Critical for deep pocket milling

7. Corrosion Resistance & Surface Treatmentson

Environment	Performance	Protection Method	Service Life Expectation
Industrial Atmosphere	Very Good	Anodizing Type II/III	15-20+ years
Marine Environment	Good	Chromate conversion + paint	10-15+ years
Fresh Water	Excellent	Minimal protection needed	30+ years
Chemical Processing	Fair to Good	PTFE impregnated anodize	Application specific
High Temperature	Fair	High-temperature coatings	5-10+ years
Buried Service	Very Good	Bituminous coatings	40+ years

Surface Treatment Options:

Anodizing:

Type II: 10-25μm thickness

Type III (Hard): 25-75μm thickness

PTFE impregnated options

Conversion Coatings:

Chromate conversion (MIL-DTL-5541)

Trivalent chromium treatments

Non-chromate alternatives (Ti/Zr based)

Painting Systems:

Epoxy primer + polyurethane topcoat

Powder coating (190-210°C cure)

High-solids industrial coatings

Special Surface Preparations:

Mechanical: Grit blast Sa 2.5

Chemical: Acid etch and desmut

Laser texturing for specialized applications

8. Physical Properties for Design Engine

ering

Property	Value	Significance in Ultra-Thick Applications
Density	2.70 g/cm³	Weight calculation for large components
Melting Range	582-652°C	Stress relieving limitations
Thermal Conductivity	167 W/m·K	Heat dissipation in large masses
Electrical Conductivity	43% IACS	EMI shielding applications
Specific Heat	896 J/kg·K	Thermal inertia in processing
Thermal Expansion	23.6 ×10⁻⁶/K	Differential expansion in assemblies
Young's Modulus	68.9 GPa	Stiffness in structural applications
Poisson's Ratio	0.33	Dimensional changes under load
Damping Capacity	0.008-0.01	Vibration characteristics
Thermal Diffusivity	69 mm²/s	Processing heat transfer rate

9. Quality Control & Testing Protocols

Mandatory Testing Protocol:

Chemical Analysis: Optical emission spectroscopy

Mechanical Testing:

Tensile testing (surface, t/4, t/2 positions)

Hardness survey (traverse and longitudinal)

Non-Destructive Evaluation:

Ultrasonic inspection per AMS-STD-2154 Class A

Penetrant inspection of critical surfaces

Metallurgical Evaluation:

Grain size measurement per ASTM E112

Inclusion rating per ASTM E45

Microstructural analysis for precipitate distribution

Dimensional Inspection:

CMM verification of critical dimensions

Laser scanning for profile accuracy

Thickness mapping at defined grid points

Certification Package:

Material Test Report (EN 10204 Type 3.1/3.2)

Chemical composition certificate

Mechanical property certification

Heat treatment chart records

NDT reports and acceptance criteria

Dimensional inspection reports

Traceability documentation (melt to product)

Compliance declarations (RoHS, REACH, etc.)

10. Industrial Applications & Handling

Primary Applications:

Aerospace structural components

Defense system platforms

Semiconductor manufacturing equipment

Plastic injection mold bases

Bridge structural elements

Nuclear industry components

Heavy transportation frames

Machine tool structural bases

Rolling mill backup rolls

High-strength fixturing elements

Material Handling Protocol:

Lifting Requirements:

Minimum 4-point lifting system

Spreader bars mandatory

Maximum sling angle: 60° from horizontal

Lifting capacity: Safety factor of 3:1

Storage Conditions:

Indoor storage recommended

Support at minimum 300mm intervals

Stacking height limitation: 1.5m maximum

Avoid direct contact with dissimilar metals

Transportation:

Secure with non-metallic strapping

Vibration dampening materials

Edge protection mandatory

Moisture protection during transit

Machining Preparation:

Temperature stabilization: 24 hours minimum

Stress relieving recommended before critical machining

Sequential material removal plan

Progressive clamping force adjustment

11. Design Considerations for Ultra-Thick Sections

Structural Design Factors:

Section Modulus Optimization:

Utilize full thickness advantage for bending resistance

I-beam equivalent performance with reduced weight

Consider internal web structures in very thick sections

Fastener Selection:

Minimum edge distance: 2× bolt diameter

Recommended thread engagement: 1.5× bolt diameter

Torque specifications: 65-75% of standard steel values

Bearing strength utilization up to 480 MPa

Thermal Management:

Allow for thermal expansion of 2.36mm per meter per 100°C

Design expansion joints for large structures

Consider thermal gradients during welding

Dynamic Loading:

Fatigue endurance limit approximately 100 MPa

Apply stress concentration factors at design phase

Shot peening for fatigue-critical surfaces

Weight Reduction Strategies:

Pocket milling of non-critical areas

Selective thickness distribution

Hybrid structures with composite elements

Topology optimization for

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