Tungsten carbide powder

When sourcing Tungsten Carbide (WC) powder, the most critical factor is Particle Size (FSSS), which typically ranges from 0.5μm (ultra-fine) to 50μm (coarse) depending on the application. You must also verify the Total Carbon (6.13% ± 0.05%) and Free Carbon content (≤0.08%), as these directly impact the hardness and stability of the final alloy. Additionally, check for Oxygen content (typically <0.3%) and the presence of trace impurities like Iron (Fe), Calcium (Ca), and Silicon (Si), which should be kept at ppm levels to ensure high-performance sintering.

Selection depends on the end-use: for cutting tools and wear-resistant parts, ultra-fine powders are preferred to achieve high hardness and toughness. For mining tools or oil drilling bits, medium to coarse grains are better for impact resistance. Always request a Scanning Electron Microscope (SEM) image from the supplier to confirm particle morphology and distribution uniformity, ensuring there is no significant agglomeration which could weaken the finished product.

A reliable supplier should hold ISO 9001:2015 certification for quality management. Since tungsten is a 'conflict mineral,' reputable suppliers on Made-in-China.com should provide a Conflict-Free Smelter (CFS) report or evidence of RMI (Responsible Minerals Initiative) compliance. Furthermore, ensure the product comes with a Certificate of Analysis (COA) for every batch, detailing the chemical composition and physical properties.

Tungsten Carbide powder is sensitive to moisture and oxidation. It must be stored in vacuum-sealed plastic bags inside steel drums. Ensure the supplier uses double-layer packaging to prevent leakage during transit. For long-term storage, a dry, ventilated environment is mandatory to prevent the powder from clumping or degrading in quality.

Tungsten is a strategic metal with fluctuating market prices. It is advised to sign long-term framework agreements or use formula-based pricing linked to the APT (Ammonium Paratungstate) index. On Made-in-China.com, you can negotiate lock-in prices for a specific duration by paying a deposit to hedge against sudden price surges.

Always utilize Escrow services or Letter of Credit (L/C) for large transactions to ensure funds are only released upon proof of shipment. Conduct a third-party pre-shipment inspection (such as SGS or Intertek) to verify that the powder's chemical purity matches the agreed specifications before the balance payment is made.

Tungsten products may be subject to export licenses or strategic commodity controls depending on the country of origin. Confirm the HS Code (typically 28499000) with your customs broker to check for anti-dumping duties. For shipping, because of its high density and weight, sea freight is the most economical; ensure the supplier uses palletized reinforced packaging to prevent drum damage during maritime transport.