Refined FeSi 75 Lump Grade 50–100mm

 

High-Purity FeSi 75 Lumps in the 50–100mm size range are tailored for industrial users seeking steady silicon content delivery, strict impurity control standards, and trouble-free furnace charging performance. From a procurement perspective, the priority extends beyond simply meeting the 75% silicon threshold-it also hinges on the material's adherence to contracted limits for critical trace elements, as well as its compatibility with existing feeding systems on-site. A uniform 50–100mm particle size minimizes erratic charging issues, while a purified chemical makeup ensures smoother melting processes and more controllable refining operations. When it comes to cost optimization, consistent material utilization often outweighs the nominal alloy grade itself; fewer corrective adjustments and lower material waste directly translate to enhanced overall consumption efficiency. It is precisely for these reasons that high-purity FeSi 75 is frequently procured under rigid technical specifications to support long-term production scheduling.

 

 

Technical Index	Typical Specification
Silicon (Si) Content	75%
Aluminum (Al) Content	≤ 0.5%
Sulfur (S) Max Content	≤ 0.02%
Phosphorus (P) Max Content	≤ 0.04%
Granule Size Scope	50–100 mm
Packaging Standard	1000 kg Jumbo Bags

 

 

Q: How do you keep the 50–100mm size range consistent for all lumps?
A: We screen all ferrosilicon lumps by size, removing any pieces that are too large or too small to secure a stable size range for furnace charging.
Q: How is refinement quality checked before products are shipped out?
A: Each product batch is tested for both silicon content and impurity levels, and corresponding inspection records are attached to the shipment paperwork.
Q: What lead time should we expect for product delivery?
A: Standard delivery takes about 15–20 days in most cases, with the exact timeline depending on your destination and the current shipping schedule.

 

 

When purchasing refined Ferrosilicon 75, the nominal silicon grade is only one part of the quality evaluation. Buyers should also examine the chemical contribution of aluminum, phosphorus and sulfur to determine whether the material is suitable for their steelmaking requirements.

The specified chemical limits of this product provide a reference for procurement and incoming material evaluation. Each element should be assessed independently rather than treating the FeSi 75 designation as a complete description of chemical quality.

Aluminum Content and Steel Chemistry

The aluminum limit of this product is 0.5% maximum. Aluminum is also used intentionally in steelmaking as a deoxidizing element. Therefore, the aluminum introduced through ferrosilicon should be considered together with other deoxidizers when calculating the final steel composition.

For steel grades with specific aluminum requirements, buyers should establish an acceptable aluminum limit for each alloy addition. This helps prevent the chemical contribution from purchased materials from exceeding the intended process target.

Phosphorus and Sulfur Limits

Phosphorus and sulfur are important residual elements in steel production. Their acceptable concentrations depend on the final steel grade and refining practice.

• Phosphorus (P): The specified maximum is 0.04%. Buyers should account for phosphorus contributions from all alloy additions and raw materials.
• Sulfur (S): The specified maximum is 0.02%. This parameter is particularly relevant when purchasing alloy materials for steel grades with controlled sulfur requirements.

These limits should be included in the purchase specification and verified against the actual chemical analysis of the supplied batch.

A Certificate of Analysis (COA) provides the analytical results used to evaluate whether a batch of ferrosilicon meets the agreed chemical specification. For refined FeSi 75, buyers should pay particular attention to the difference between the nominal grade and the measured values reported on the certificate.

A practical COA review should include the following checks:

Inspection Item	Buyer Verification
Silicon (Si)	Check whether the measured value meets the agreed 75% specification.
Aluminum (Al)	Verify that the measured value does not exceed 0.5%.
Phosphorus (P)	Verify that the measured value does not exceed 0.04%.
Sulfur (S)	Verify that the measured value does not exceed 0.02%.
Batch Identification	Confirm that the analysis corresponds to the relevant production or shipment batch.
Inspection Information	Check the inspection date, analytical results and applicable testing documentation.

For regular procurement, comparing COAs from different batches can help buyers identify variations in chemical composition and assess whether the supplied material consistently meets their purchasing requirements.

For a broader explanation of silicon grades, chemical limits and specification evaluation, refer to our Ferrosilicon 75 Specification Guide.

A clearly written purchase specification helps both the buyer and supplier establish consistent quality expectations. For refined ferrosilicon, the chemical requirements should be stated numerically rather than relying only on general descriptions such as high purity or refined grade.

Before confirming an order, buyers can include the following information in their technical specification:

• Silicon requirement: Specify the required silicon content and the applicable acceptance range.
• Aluminum limit: State the maximum acceptable aluminum content.
• Phosphorus limit: Define the maximum phosphorus concentration.
• Sulfur limit: Define the maximum sulfur concentration.
• Additional elements: Include any requirements for calcium, manganese, chromium or carbon where relevant to the application.
• Inspection documentation: Specify the COA requirements and whether independent third-party testing is needed.

The purchase agreement should also clarify the applicable sampling and acceptance procedures. This is particularly important for buyers who require repeat shipments with consistent chemical specifications.

The actual acceptance criteria should always be agreed between the buyer and supplier before production. A general product description should not replace a written chemical specification.

If your production requires Ferrosilicon 75 with defined aluminum, phosphorus and sulfur limits, you can send your chemical requirements to ZHEN AN INTERNATIONAL CO., LIMITED for specification confirmation.

When making an inquiry, please indicate your required silicon content, impurity limits, order quantity and destination. Providing your target chemical composition helps our team understand your purchasing requirements and prepare the relevant quotation information.

Contact Us for Refined Ferrosilicon 75

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