Magnesium alloy az91

AZ91 is the most widely used magnesium die-casting alloy. You must verify the chemical composition, specifically ensuring Aluminum (8.3%–9.7%) and Zinc (0.35%–1.0%) levels are within range to guarantee the balance of castability and mechanical strength. Additionally, check for impurity limits (Iron, Copper, Nickel) as high levels significantly reduce corrosion resistance.

Request a Material Test Report (MTR) or a Certificate of Analysis (COA). Key benchmarks include a Tensile Strength of approximately 230-250 MPa and a Yield Strength of 150-160 MPa. For die-cast parts, ensure the supplier performs X-ray flaw detection or ultrasonic testing to check for internal porosity, which is a common defect in magnesium casting.

Suppliers should adhere to ASTM B94 (for die castings) or ASTM B93 (for ingots). If the alloy is intended for the automotive or electronics sectors, ensure compliance with RoHS (Restriction of Hazardous Substances) and REACH regulations. For automotive applications, verify if the supplier is IATF 16949 certified to ensure rigorous quality management.

AZ91 is prized for its high strength-to-weight ratio, being 33% lighter than aluminum. It is ideal for automotive components (steering wheels, bracketry), consumer electronics (laptop casings, camera bodies), and power tools. Its excellent damping capacity makes it functional for reducing vibration in high-speed machinery.

Magnesium in certain forms (like turnings or fine chips) is classified as a Class 4.1 or 4.3 Dangerous Good because it is flammable and can react with water to release hydrogen gas. While AZ91 ingots are generally stable, they must be kept in a dry, ventilated environment to prevent surface oxidation (white rust). Ensure your logistics provider is experienced in handling non-ferrous metals to avoid moisture exposure during sea transit.

Utilize secure payment methods and prioritize suppliers on Made-in-China.com who have undergone Audited Supplier verifications. It is highly recommended to hire a third-party inspection agency (like SGS or Intertek) to conduct a Pre-Shipment Inspection (PSI) to verify the quantity, weight, and chemical purity before the final balance is paid.

Magnesium prices are often tied to global market indices (like the Shanghai Metal Exchange or London Metal Exchange). Negotiate based on a formula-based pricing model (Market Price + Processing Fee) rather than a fixed price to account for market volatility. Inquire about volume-based discounts; typically, orders exceeding 5-10 metric tons can command significantly lower premiums.

Check for anti-dumping duties that may apply to magnesium products originating from specific regions. Ensure the HS Code (typically 8104.11 for ingots or 8104.90 for articles) is correctly declared to avoid customs delays. Always clarify the Incoterms (e.g., FOB or CIF) in the contract to define exactly where the risk of loss transfers from the seller to the buyer.