Tungsten carbide brazed tips

Buyers must prioritize the ISO Grade (e.g., K10, K20, P20, P30) which determines the balance between hardness and toughness. For machining cast iron and non-ferrous metals, K-series (straight tungsten carbide) is ideal, while P-series (containing TiC/TaC) is required for steel to resist crater wear. Additionally, verify the TRS (Transverse Rupture Strength), which should typically be above 2000 MPa for heavy-duty applications to prevent premature fracturing.

The surface treatment of the brazing side is critical. Ensure the tips are sandblasted or chemically cleaned to remove oxides, which facilitates a stronger bond with the silver or copper solder. The dimensional tolerance (typically within ±0.5mm) must be strictly controlled to ensure a proper fit into the tool shank pocket, preventing stress concentration during the brazing process.

A reliable supplier should hold ISO 9001:2015 certification for quality management. For high-precision industries, request SGS or TUV inspection reports regarding the cobalt (Co) content and grain size (fine grain vs. coarse grain). Ensure the products comply with REACH and RoHS regulations if the finished tools are destined for the European market, ensuring the absence of hazardous substances.

Type A (Square) tips are generally used for turning and facing, Type C (Rectangular) for grooving, and Type E (Threaded) for threading tools. Selecting the correct geometry and rake angle is essential for chip evacuation and reducing heat generation, which directly impacts the tool life and surface finish of the workpiece.

Recycled powder often leads to inconsistent performance. To avoid this, request a Metallographic Structure Report to check for porosity and carbon deficiency (eta phase). On Made-in-China.com, prioritize Audited Suppliers who provide Material Test Certificates (MTC) for every batch to ensure the use of 100% virgin raw materials.

Tungsten prices are volatile due to APT (Ammonium Paratungstate) market fluctuations. Negotiate a price adjustment clause based on market indices for long-term contracts. For MOQs, many specialized factories allow small trial batches (5-10kg); however, reaching a 50kg+ threshold usually unlocks a 15-20% discount and better shipping rates.

Carbide tips are heavy but small, making them ideal for air express (DHL/FedEx) for urgent needs, but LCL (Less than Container Load) sea freight is more cost-effective for bulk. Ensure the supplier provides the correct HS Code (typically 8209.00) to avoid customs delays. Because they are brittle, insist on vacuum packaging followed by reinforced wooden cases or heavy-duty plastic boxes with foam inserts to prevent chipping during transit.

Always utilize Trade Assurance services provided by Made-in-China.com to protect your payment until delivery is confirmed. For large orders, consider a third-party pre-shipment inspection to verify the quantity, grade marking, and weight before the final balance is paid.