Cast iron scrap

Selecting the right grade is critical for foundry efficiency. Buyers should distinguish between Machinery Cast Iron (No. 1 Cast), which is clean and free of white iron, and Auto Cast, which consists of brake drums and engine blocks. Ensure the scrap is categorized by chemical composition, specifically monitoring Carbon (3.2-3.6%) and Silicon (1.8-2.2%) levels. For high-precision casting, prioritize Clean Cupola Cast that is sized appropriately (usually not exceeding 24 inches) to fit your furnace charging system.

Quality is defined by the absence of contaminants. Strict adherence to ISRI (Institute of Scrap Recycling Industries) codes (e.g., 252-258) is recommended. The scrap must be free of excessive rust, scale, and non-metallic residues like dirt or glass. Crucially, verify that the material is free from hazardous contaminants, such as lead, mercury, or radioactive sources, and ensure the deleterious phosphorus and sulfur content is within your metallurgical tolerance to prevent brittleness in finished products.

Consistency is managed through Pre-Shipment Inspection (PSI). Request a Spectrometer Analysis Report from the supplier for each batch to confirm the alloy balance. It is also vital to check the density and weight-to-volume ratio; high-quality cast iron scrap should be dense to minimize melting loss. For large-scale procurement, look for suppliers who utilize magnetic separation and shredding technologies to ensure a uniform product size and purity.

The total cost is heavily influenced by the yield rate (recovery rate). While lower-grade scrap may have a cheaper sticker price, high impurity levels lead to increased slag production and energy consumption during melting. Calculate the Cost per Ton of Liquid Metal rather than the raw purchase price. Additionally, consider the volatility of the global steel index and negotiate contracts with price adjustment formulas based on recognized market benchmarks to mitigate financial risk.

The most significant risks include weight discrepancies and quality substitution. To mitigate this, always use reputable third-party surveyors like SGS or CCIC to verify the weight at the loading port and the discharge port. Ensure the Bill of Lading (B/L) matches the packing list exactly. Furthermore, be wary of 'too-good-to-be-true' prices, which often indicate fraudulent schemes or contaminated materials that may be rejected by customs.

Scrap metal is subject to strict environmental import/export regulations (such as the Basel Convention). Ensure the supplier provides a Certificate of Origin and an Environmental Protection Compliance Certificate. Many countries require a Pre-shipment Inspection Certificate for Waste Designations. Failure to provide these can lead to heavy fines or the forced return of the cargo at the buyer's expense.

For new suppliers, avoid 100% advance payments. Utilize Irrevocable Letters of Credit (L/C at sight) or Escrow services provided by professional platforms like Made-in-China.com to ensure funds are only released upon verification of shipping documents. When negotiating, define the allowable percentage of 'fines' (small particles) and moisture content, as these directly impact the usable weight of the iron.

Cast iron scrap is typically shipped in 20ft heavy-duty containers or via Bulk Carriers for orders exceeding 5,000 tons. Ensure the containers are lined with plywood or heavy-duty plastic to prevent damage to the container walls, which can result in 'container damage fees' from shipping lines. For inland transport, confirm the maximum weight limits of the destination country to avoid overloading penalties during the 'last mile' delivery.