6061 T651 Stress Relieved Aluminum Plate 8-200mm Thick 1500mm Wide for Mold Die Manufacturing Structural Uses

Yongsheng 6061 T651 Stress-Relieved Aluminum Plate is a precision heat-treated medium-thick alloy plate engineered for applications where post-machining dimensional stability is critical. The T651 temper designation signifies a three-stage process: solution heat treatment above 530°C to dissolve alloying elements into a homogeneous solid solution, followed by controlled stretching (1-3% permanent set) to relieve residual quenching stresses, and finally artificial aging at 160-180°C to achieve peak precipitation hardening. This process delivers tensile strength ≥310 MPa (typical 310-340 MPa), yield strength ≥276 MPa, elongation ≥10%, and Brinell hardness approximately 95 HB, fully compliant with ASTM B209, EN 485, and GB/T 3880 industrial standards.

Unlike standard T6 temper plates that are prone to warping and distortion during heavy material removal, our T651 stress-relieved plate maintains exceptional flatness and dimensional accuracy throughout CNC machining, milling, and drilling operations. With thickness availability from 8mm to 200mm and a precise width of 1500mm (tolerance ±0.2mm), this plate is the preferred choice for mold bases, die sets, structural frames, tanker baffles, truck trailer flooring, and heavy construction components where precision and repeatability are non-negotiable.

• Alloy & Temper: 6061 T651 (Solution Heat Treated + Stress Relieved by Stretching + Artificially Aged)
• Tensile Strength: ≥310 MPa (Typical 310-340 MPa), Yield Strength: ≥276 MPa
• Elongation: ≥10%, Brinell Hardness: Approximately 95 HB
• Thickness Range: 8 - 200mm, Width: 1500mm (Tolerance ±0.2mm)
• Flatness: Guaranteed through T651 stress-relief process, minimal distortion after machining
• Surface Finish: Mill finish, silvery metallic appearance
• International Standards: ASTM B209, EN 485, GB/T 3880.1 compliant
• Certification: ISO 9001:2015, Mill Test Certificate (MTC) supplied with every shipment
• Form: Solid flat medium-thick plate, cut-to-length available
• Extra Service: Free test samples available for mechanical property verification

Yongsheng 6061 T651 stress-relieved Aluminum Plate delivers industry-leading machining stability and mechanical consistency across these demanding applications:

1. Mold & Die Manufacturing: The T651 stress-relief process eliminates post-machining deformation, making this plate the optimal choice for injection mold bases, die-casting die sets, and precision tooling plates. Flatness retention ensures consistent parting line closure and cavity alignment throughout the mold service life.
2. Truck & Trailer Flooring: High yield strength (≥276 MPa) combined with 10% elongation provides the fatigue resistance required for cyclic loading in heavy transport. The excellent strength-to-weight ratio reduces vehicle dead weight while maintaining structural integrity under dynamic cargo loads.
3. Tanker Baffle & Anti-Slosh Plate: Consistent mechanical properties across the full plate width ensures uniform performance under dynamic hydraulic loads. Excellent weldability allows reliable baffle assembly with minimal heat-affected zone softening.
4. Vehicle Structural Frame: The T651 temper delivers the optimal strength-ductility balance needed for energy absorption in crash scenarios while providing structural rigidity for frame rails, cross members, and chassis reinforcements.
5. Construction Structural Components: ASTM B209 compliant mechanical properties with full MTC traceability support code-governed projects including bridge components, support beams, and architectural frameworks.

Yongsheng provides customized 6061 T651 Aluminum Plate with thickness from 8mm to 200mm and standard width of 1500mm with ±0.2mm tolerance. All production follows ASTM, EN and GB specifications with full temper verification documentation.

Custom cut-to-length, sizing, and surface preparation services are available. The T651 stress-relieved condition ensures that even heavily machined custom components retain dimensional accuracy. Whether you need blank plates for in-house machining or pre-cut blanks for immediate fabrication, we deliver consistent temper properties batch after batch.

All customized plates can be shipped from Shanghai, Tianjin or Qingdao ports with stable mass supply capacity of 5000 tons per month.

We provide comprehensive technical support for every buyer of 6061 T651 Aluminum Plate. Complete material certificates, mechanical test reports, and machining operation guides are provided to support factory audit and customs clearance.

Our technical team offers guidance on optimal cutting parameters, tool selection, and CNC programming for T651 temper aluminum. We provide welding procedure recommendations and post-weld treatment advice to maintain joint integrity in fabricated assemblies.

Strict full batch quality control guarantees consistent mechanical properties from plate to plate. Our after-sales team delivers rapid problem resolution and long-term technical consultation for your ongoing production needs.

Each Aluminum Plate is protected with anti-scratch film and stacked on standard seaworthy wooden pallets. Moisture-proof film wrapping and reinforced edge protection prevent damage during long ocean transportation.

Clear shipping marks and complete cargo documentation including packing list, commercial invoice, and mill test certificates are attached for smooth customs clearance at destination ports.

We cooperate with trusted international logistics providers and support FOB/CIF sea shipment from Shanghai, Tianjin, and Qingdao ports to global destinations with reliable 7-15 working day lead time after deposit confirmation.