DIN 3.1255 Aluminium Plates- WNr 3.1255 Plate, Sheet, Blocks

Product Description

Technical Specifications

Forms & Supply Dimensions

Suppliers typically stock 3.1255 in thick sections because its strength makes it ideal for machining complex components from solid material.

1. 3.1255 Plates & Sheets

• Thin Sheets: 0.5mm to 6mm (often used in aircraft "skins").

• Medium/Heavy Plates: 6mm up to 150mm+.

• Surface Finish: Mill finish, or PVC coated for protection during transit.

• Alclad Option: Often available as "Alclad 2014A," where the core 3.1255 is sandwiched between layers of pure aluminum to prevent corrosion.

2. 3.1255 Blocks

• Size: Custom cut-to-size blocks are common for tooling and mold-making.

• Stress Relieving: Blocks are almost always supplied in the T651 condition. This involves a controlled stretch after heat treatment to reduce internal stresses, ensuring the block doesn't warp or "move" during heavy CNC machining.

Why Use WNr 3.1255?

3.1255 is selected over more common alloys like 6082 (3.2315) or 5083 (3.3547) for three specific reasons:

1. Extreme Hardness: With a Brinell hardness typically around 135“150 HB, it resists surface wear and deformation.

2. Machinability: It is categorized as a "free-cutting" alloy. You can achieve high-tolerance finishes and intricate details without the material "gumming" up the tools.

3. Strength-to-Weight: It provides the structural integrity of some steels at roughly one-third the weight.

Typical Applications

• Tooling & Fixtures: High-strength jigs and assembly fixtures for automotive production.

• Aerospace: Landing gear components, structural ribs, and internal fittings.

• Defense: High-stress components for military vehicles and hardware.

• Mold Making: Used for prototype injection molds where high thermal conductivity and surface hardness are required.

Important Handling Notes

šï Corrosion Warning: 3.1255 has low resistance to atmospheric corrosion. If used in humid or outdoor environments, plates and blocks must be painted, anodized, or hard-coated to prevent pitting and intergranular corrosion.

šï Welding: This material is not suitable for structural welding. Heating the material during welding destroys the T6 heat treatment and can lead to cracking.