Molybdenum wire 0.18mm

For 0.18mm molybdenum wire, primarily used in EDM (Electrical Discharge Machining), you must verify the tensile strength, which should typically range between 1900-2300 N/mm² to prevent breakage. Ensure the purity level is ≥99.95% to guarantee stable electrical conductivity and heat resistance. Additionally, check the elongation rate (usually <3%) to ensure the wire maintains its diameter under tension during high-speed cutting.

The surface should be smooth, free of oxidation, cracks, or pits. A high-quality black molybdenum wire (with graphite coating) or white molybdenum wire (cleaned) ensures stable discharge and reduced wire wear. This directly impacts the surface roughness (Ra value) of the workpiece being cut; a consistent 0.18mm diameter with a tolerance of +/- 0.002mm is critical for precision mold making.

Suppliers should adhere to ISO 9001 for quality management systems. For the material itself, look for compliance with ASTM B387 (Standard Specification for Molybdenum Bar, Rod, and Wire). Requesting a Material Test Certificate (MTC) that details the chemical composition and physical properties is essential for industrial-grade procurement.

This specific diameter is the industry standard for CNC Wire-cut EDM machines. It is widely used in aerospace, medical device manufacturing, and precision mold industries for cutting hard metals like tungsten carbide or hardened steel. It is also utilized in high-temperature furnace heating elements and vacuum electronic components due to its high melting point of 2623°C.

Molybdenum is sensitive to moisture. Ensure the supplier uses vacuum packaging or moisture-proof plastic sealing with desiccant. Request batch-specific testing videos showing a 'bend test' or 'tensile test' before shipment. For large orders, sourcing through reputable platforms like Made-in-China.com allows you to utilize secured payment services to protect your capital until quality is verified.

Since molybdenum is a refractory metal commodity, prices fluctuate with raw material costs. Negotiate based on weight (kg) vs. length (meters) to ensure transparency. Ask for tiered pricing; for example, orders over 50kg or 100kg usually trigger a 10-15% discount. Inquire if the supplier can provide OEM spool sizes (e.g., 2000m or 3000m per spool) to reduce machine downtime.

Molybdenum wire is heavy but compact. Air freight is recommended for smaller batches to prevent long-term exposure to sea salt air, which causes corrosion. Ensure the HS Code (typically 81029600) is correctly declared to avoid customs delays. Check for any anti-dumping duties applicable to specialty metals in your specific country (e.g., USA or EU) before finalizing the Proforma Invoice.

Always use Trade Assurance or Escrow services provided by Made-in-China.com to ensure funds are only released upon proof of shipment. Conduct a factory audit or hire a third-party inspector (like SGS) to verify the spool winding quality, as uneven winding can cause wire snapping during high-speed EDM operations.