Steel slag price

When sourcing steel slag, you must prioritize chemical composition and physical stability. Key metrics include the Total Iron (TFe) content (typically 10-30% for recycling), Calcium Oxide (CaO) levels, and the Basicity Index. For construction applications, ensure the Free Lime (f-CaO) content is below 3% to prevent volumetric expansion and structural cracking. Additionally, verify the particle size distribution (grading) and Los Angeles Abrasion value if the slag is intended for road base or asphalt aggregates.

The price is heavily influenced by the level of processing. Raw/Crude Slag is the cheapest but contains high impurities. Crushed and Screened Slag commands a premium as it is ready for immediate use in construction. Weathered or Aged Slag (typically aged for 6+ months) is more expensive but safer for civil engineering because the expansion potential has been neutralized. Furthermore, magnetic separation to recover residual scrap metal can either lower the price (if the supplier keeps the metal) or increase it if you are buying high-density heavy media.

Steel slag is often classified under HS Code 2619.00. Buyers must ensure the material complies with environmental leaching tests such as the TCLP (Toxicity Characteristic Leaching Procedure) or EN 12457 to prove it is non-hazardous. For use in cement production, it should meet ASTM C989 or EN 15167-1 standards. Always request a Material Safety Data Sheet (MSDS) and a Certificate of Analysis (COA) from a recognized third-party laboratory like SGS or Intertek to ensure no heavy metal contamination exceeds local regulatory limits.

The most significant risk is moisture content variation, as steel slag is often stored outdoors. High moisture increases the shipping weight and freight costs without adding value. Another risk is chemical inconsistency between batches. To mitigate this, use Trade Assurance services on platforms like Made-in-China.com and mandate a pre-shipment inspection (PSI) to verify that the chemical properties and weight match the proforma invoice.

Since steel slag is a low-value, high-density commodity, logistics costs often exceed the product value. Negotiate based on FOB (Free On Board) terms if you have a reliable freight forwarder, or CIF (Cost, Insurance, and Freight) if you want the supplier to handle the complexities of bulk vessel chartering. For large volumes (over 5,000 tons), seek tiered pricing where the unit price drops by 10-15% as volume increases. Always clarify who bears the cost of port storage fees and demurrage.

For new suppliers found on Made-in-China.com, start with a Letter of Credit (L/C) at sight to ensure payment is only released upon presentation of valid shipping documents and quality certificates. Avoid 100% upfront T/T payments. Ensure the contract specifies weight determination methods (e.g., draft survey at the loading port) to prevent disputes regarding weight shortages upon arrival at the destination port.