Carbide for crusher

When sourcing carbide inserts or wear parts for crushers, the most critical factor is the Tungsten Carbide (WC) grain size and Cobalt (Co) content. For high-impact crushing, a Cobalt content of 8% to 15% is typically required to balance hardness and toughness. You must also verify the Rockwell Hardness (HRA), which should generally fall between 85.0 and 92.0 depending on the specific application (e.g., VSI crushers vs. jaw crushers). Additionally, ensure the Density (g/cm³) aligns with the grade specifications to confirm the absence of porosity.

The choice depends on the material being processed. For hard and abrasive rocks like granite or basalt, prioritize grades with higher wear resistance (lower Cobalt). For high-impact scenarios where the carbide is subject to heavy striking forces, choose grades with higher transverse rupture strength (TRS), typically exceeding 2500 N/mm², to prevent premature cracking or chipping. Always request a Grade Comparison Chart from the supplier to match their internal codes with international standards like ISO P, M, or K series.

Professional B2B buyers should ensure suppliers adhere to ISO 9001:2015 for quality management. For the material itself, look for compliance with ASTM B276 (standard test method for apparent porosity) and ASTM B311 (density testing). If the parts are used in machinery exported to the EU, ensure the supplier provides a REACH declaration regarding chemical substances. Requesting a Metallographic Analysis Report is the best way to verify internal structure consistency.

Carbide is primarily used in Vertical Shaft Impact (VSI) crushers as rotor tips, back-up liners, and wear plates. It is also widely used in horizontal shaft impactors (HSI) and as protective teeth in mining and tunneling boring machines. In recycling industries, carbide-tipped hammers are essential for shredding scrap metal and construction waste due to their ability to maintain a sharp edge longer than manganese steel.

The biggest risk in cross-border carbide sourcing is the use of recycled zinc-process powders which compromise durability. To mitigate this, specify in your contract that only 100% virgin raw materials are acceptable. Use Made-in-China.com's 'Audit Report' service to verify if the supplier has in-house powder mixing and sintering capabilities, rather than just being a small grinding workshop.

Carbide pricing is heavily influenced by the global market price of Tungsten and Cobalt. It is advisable to negotiate a formula-based pricing model for long-term contracts. For MOQs, while standard shapes may have low requirements, customized OEM drawings usually require a minimum of 5kg to 20kg to cover the costs of mold design and sintering furnace cycles. Always ask for a volume-based discount tier (e.g., 100kg, 500kg, 1000kg).

Carbide is extremely heavy but brittle. Ensure the supplier uses plastic cases or vacuum packaging for individual pieces to prevent them from striking each other, followed by reinforced wooden crates for sea or air freight. For shipping to international markets, confirm the HS Code (typically 8209.00) to accurately calculate import duties and ensure the supplier provides a Certificate of Origin to benefit from potential trade agreements.

Utilize Secured Payment services on Made-in-China.com to ensure that funds are only released to the supplier after you have confirmed receipt and inspected the goods. For large bulk orders, consider hiring a third-party inspection agency (like SGS or Intertek) to perform a pre-shipment inspection, focusing on dimensional accuracy (using calipers/micrometers) and weight verification.