Tungsten carbide bars

When sourcing tungsten carbide bars, you must prioritize Grade (Cobalt content) and Grain Size. For high-impact applications, a higher cobalt content (10-12%) provides better toughness, while lower cobalt (6%) increases hardness and wear resistance. Additionally, specify the Hardness (HRA) and Transverse Rupture Strength (TRS) to ensure the material can withstand the mechanical stress of your specific industrial application.

You should specify whether you require unground (black) or ground (polished) bars. For precision tooling, request a h6 or h7 tolerance on the diameter. Ensure the supplier uses centerless grinding technology to maintain perfect circularity and a surface roughness (Ra) of less than 0.4μm to reduce friction and heat buildup during subsequent machining.

Reliable suppliers should adhere to ISO 9001:2015 for quality management. It is critical to request a Material Test Report (MTR) or a Certificate of Analysis (COA) for every batch, detailing the chemical composition and physical properties. For exports to the EU, ensure compliance with REACH and RoHS regulations regarding hazardous substances.

Tungsten carbide bars are versatile: Solid round bars are primarily used for making end mills, drills, and reamers. Bars with coolant holes (straight or helical) are essential for high-speed machining where internal cooling is required. Rectangular strips are commonly used for woodworking knives, wear-resistant parts in mining, and precision molds.

The biggest risk in carbide sourcing is the use of recycled scrap powder (black powder) instead of 100% virgin raw materials. To mitigate this, request a metallographic inspection report to check for porosity and impurities. You should also conduct a third-party inspection (such as SGS) before final payment to verify the density and hardness levels match the agreed specifications.

Tungsten is a commodity; therefore, pricing is heavily influenced by the market price of APT (Ammonium Paratungstate). When negotiating on Made-in-China.com, look for suppliers offering tiered pricing based on weight. For custom sizes, expect a higher Minimum Order Quantity (MOQ) of 50-100kg, whereas standard sizes (e.g., 330mm length) may be available for immediate shipping in smaller quantities.

Tungsten carbide is extremely dense and brittle. Ensure the supplier uses individual plastic tubes or protective netting for each bar to prevent clashing. For international transit, the outer packaging must be reinforced wooden crates (fumigated) rather than standard cardboard, as the high weight-to-volume ratio can easily break through weak packaging during sea or air freight.

Check the specific HS Code (typically 8209.00) for your country to determine import duties. Be aware of anti-dumping duties that some regions (like the EU or USA) may impose on specific Chinese metallurgical products. Always clarify the Incoterms (e.g., FOB or CIF) and ensure all export documentation accurately reflects the material grade to avoid customs delays.