Tungsten carbide tc bush

Buyers should prioritize the Cobalt (Co) content and Grain Size, as these determine the balance between hardness and toughness. For high-wear environments, a 6% to 10% Cobalt range is standard. Ensure the supplier provides a Hardness rating (typically HRA 89-92) and Transverse Rupture Strength (TRS) data. For precision applications, verify that concentricity and cylindricity tolerances meet your specific mechanical drawings, often requiring precision grinding to ±0.005mm.

TC bushes are primarily used in oil and gas drilling, centrifugal pumps, and high-speed stamping dies. Performance benchmarks must include corrosion resistance (especially if exposed to acidic fluids) and thermal shock stability. You should request density testing (ISO 3369) to ensure the absence of internal porosity, which can lead to premature fracturing under high-pressure loads.

Ensure the manufacturer adheres to ISO 9001:2015 for quality management. It is essential to request a Material Test Certificate (MTC) that includes a metallographic analysis to check for 'Eta phase' (carbon deficiency) which makes the carbide brittle. For parts used in sensitive machinery, check for RoHS compliance regarding heavy metal content.

A top-tier supplier should support OEM/ODM services based on CAD or STEP files. Look for providers who offer surface treatments like mirror polishing (Ra < 0.1) to reduce friction. Additionally, confirm if they can perform shrink-fitting or brazing if the TC bush needs to be integrated into a steel housing before delivery, as this requires specialized thermal equipment.

The biggest risk is material substitution, where suppliers use recycled 'scrap' carbide instead of virgin tungsten powder, leading to unpredictable tool life. To mitigate this, use Made-in-China.com's Secured Trading services and insist on a pre-shipment third-party inspection (such as SGS or Intertek) to verify hardness and dimensions.

TC products are heavily influenced by the global market price of Tungsten and Cobalt. Negotiate a formula-based pricing model for long-term contracts. While standard sizes may have low MOQs, custom molds usually involve a one-time tooling fee. Ask for this fee to be refunded or credited once cumulative order volume reaches a specific threshold (e.g., 500-1,000 units).

Tungsten carbide is extremely dense but brittle and prone to chipping. Ensure the 'Notification' includes requirements for individual vacuum packaging or plastic protective sleeves, followed by reinforced wooden crates (fumigated per ISPM 15 standards). For urgent industrial repairs, Air Freight is recommended due to the high value-to-weight ratio, but ensure the package is insured for its full replacement value.

Tungsten is often classified as a strategic mineral. Check for any export duties or quotas from the origin country and anti-dumping duties in your local region. Ensure the HS Code (typically 8113.00 or 8483.30) is correctly declared on the Commercial Invoice to avoid customs delays and ensure accurate tariff application.