Heat-Treat-Free Aluminum Alloy for Integrated Die Casting: Complete Procurement & Application Guide

1. What Is Heat-Treat-Free Aluminum Alloy

Heat-treat-free (cast-as-F) aluminum alloys for integrated die casting deliver the required mechanical properties right after large structural-component casting—without the T7 solution+aging step. This removes heat-treatment-induced distortion and straightening headaches, and is the key material for one-piece die-cast EV rear underbodies, front structures and battery trays.

2. Key Grades & Specs

• Representative grades: AlSi10MnMg-family heat-treat-free variants (domestic grades inspired by Castasil®-37 / Aural-3 concepts), and high-strength Al-Mg grades.
• Key metrics: yield ≥120–150 MPa, elongation ≥10–12%, good fluidity/fillability, low hot-tear and shrinkage-porosity tendency.
• Alloy design: low Fe, optimized Sr/Bi modification, tuned Mg/Si ratio to balance strength and toughness.

3. Typical Applications

EV rear underbody, front rail assemblies, battery-pack lids/trays and e-drive housings—large thin-wall parts on 6000–9000T die-casting machines.

4. Procurement Checklist

• Require as-cast (F-temper) property reports and Giga-cast trial validation.
• Watch impurity consistency (Fe, Cu) and lot-to-lot stability.
• Evaluate the supplier’s joint process-development capability with the die caster.

5. Supplier Landscape & Trend

Both overseas primary-aluminum producers and domestic mills are localizing heat-treat-free grades. With more OEM integrated-die-casting awards in 2026, sourcing demand is ramping fast—prioritize grades already validated by vehicle makers and secure stable supply.