ferro silicon inoculant with silicon content 74% particle appearance showing fine particle texture, dark gray color and metallic sheen with specifications below

ferro silicon inoculant silicon content 74% size 0.2-0.8mm particle with ruler for size reference and chemical specifications table

ferro silicon inoculant silicon content 74% size 3-8mm particle with ruler for size reference and chemical specifications table

FeSi 74% Inoculant – Premium Grade Ferrosilicon for Gray & Ductile Iron Foundries

High‑purity ferrosilicon (74‑77% Si) offering consistent graphitization, chill reduction, and improved mechanical properties across a wide range of casting sections.

Main Composition	Si 74-77%, Al ≤1.5%, Ca ≤1.0%, Fe balance
Form	Lumps/Granules/Custom
Application	General gray and ductile iron castings, thin‑wall sections, automotive castings, pipe fittings

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FeSi 74% Inoculant – Reliable Graphitization for Consistent Casting Quality

This ferrosilicon inoculant with 74–75% silicon is a standard yet high‑performance alloy designed for foundries producing gray and ductile iron components requiring dependable chill reduction and uniform graphite distribution. With a controlled silicon content of 74‑77%, it provides a balanced graphitizing potential suitable for both thin‑wall castings (down to 3 mm) and medium‑section engineering parts. The moderate aluminium and calcium levels (≤1.5% Al, ≤1.0% Ca) ensure effective deoxidation and nucleation without excessive dross formation.

Core Advantages & Technical Features

Consistent Chill Reduction: The well‑defined silicon range guarantees predictable carbide elimination in rapidly cooling sections, minimizing hard edges and improving machinability.
Controlled Al & Ca Content: Optimized levels (Al ≤1.5%, Ca ≤1.0%) promote adequate nucleation while keeping slag and pinholing risks low, especially in ductile iron.
Versatile Section Adaptability: Effective in both thin‑wall castings (where strong chill reduction is needed) and in medium/heavy sections, ensuring a uniform ferritic/pearlitic matrix.
Good Fade Resistance for Standard Inoculation: While not a long‑fade alloy like high‑barium grades, FeSi 74% offers reliable performance for typical pouring times (up to 15‑20 minutes) and is ideal for single‑ladle operations.
Custom Particle Sizing: Available in various size fractions to suit ladle, stream, or in‑mould inoculation, ensuring optimum dissolution and recovery.

Note: This product is non‑radioactive and fully complies with REACH and RoHS environmental standards. Manufactured under ISO 9001 certified processes.

Technical Specifications – Inoculant Grades (FeSi 74% & others)

Below is the chemical composition of our FeSi 74% (highlighted) compared with other common inoculant grades. Custom compositions and impurity limits are always available on request.

Chemical Composition (Typical Values, % by weight)

Grade / Designation	Si (%)	Ba (%)	Al (%)	Ca (%)	Fe & Others
FeSi 74% (Premium)	74-75	–	≤1.5	0.5-1.5	Balance
FeSiBa 1-2% Ba	70-75	1.0-2.0	1.0-1.5	0.6-3.0(customizable)	Balance
FeSiBa 2-4% Ba	70-75	2.0-4.0	1.0-1.5	0.6-3.0	Balance
FeSiBa 4-6% Ba	65-70	4.0-6.0	1.0-1.5	1.0-3.0(customizable)	Balance
FeSi 72%	72-75	–	≤1.5	≤1.0	Balance
FeSi 75%	75-78	–	≤1.5	≤0.5-1.5	Balance

Physical & Thermal Properties (FeSi 74%)

Property	Typical Value / Range	Remarks
Melting Range (Solidus/Liquidus)	1210°C - 1330°C (2210°F - 2426°F)	Typical for standard ferrosilicon, ensures rapid dissolution in molten iron
Specific Gravity (Density at 20°C)	3.2 - 3.5 g/cm³	Dense alloy, good penetration in ladle additions
Bulk Density	Approx. 1.8 - 2.2 g/cm³ (112 - 137 lbs/ft³)	Depends on particle size distribution
Thermal Expansion Coefficient (20-1000°C)	~11.2 × 10⁻⁶ /K	–
Microstructure	FeSi₂ + FeSi eutectic phases	Homogeneous silicon distribution

Available Particle Sizes (Customizable for FeSi 74%)

Ladle Addition (General Foundry): 5-30 mm, 10-50 mm (optimal dissolution for medium‑size ladles).
Late / Stream Inoculation: 0.2-0.8 mm, 0.5-1.5 mm (excellent flowability, low dust).
Wire Feeding: 0.5-3 mm (consistent fill for cored wire).
In‑mold / Sprue Inoculation: 1-3 mm, 3-8 mm (controlled solubility).
Lumps (Furnace Addition): 10-100 mm (custom).

Processing Note: Manufactured via controlled casting or granulation to guarantee homogeneous composition and minimal fines.

Key Applications & Recommended Addition Rates – FeSi 74%

FeSi 74% is a versatile inoculant suitable for a wide spectrum of iron castings, particularly where reliable chill reduction and consistent mechanical properties are required:

General Gray Iron Castings: Engine blocks, brake drums, machine bases, and housings.
Typical Addition: 0.2% – 0.6% of melt weight (depending on base sulfur and section thickness).
Ductile Iron Production (Thin to Medium Sections): Automotive suspension parts, pipe fittings, valve bodies. Ensures good nodule count and ferritic matrix.
Thin‑Wall Castings (<10 mm): Provides strong chill elimination, preventing carbide formation in rapidly cooling edges.
Sand‑Cast and Permanent Mold Castings: Suitable for both processes, improving graphite morphology and reducing section sensitivity.
Countergravity Casting and Low‑Pressure Casting: Fine particle sizes available for precise inoculation.

Note: Optimal addition rate should be fine‑tuned based on base iron composition (S, O, trace elements), target matrix, and pouring conditions. We recommend foundry trials with incremental adjustments.

Packaging & Logistics – FeSi 74% Inoculant

Packaging Options

1‑ton Jumbo Bags: Standard for bulk orders, with inner moisture‑proof liner.
25kg / 50kg Bags: For smaller foundries or trial batches.
Custom Packaging: Big bags with pallets, stretch‑wrapped, or sealed drums available.

Logistics Information

Parameter	Details
Minimum Order Quantity	20 metric tons (trial orders of 5‑10 t possible upon request)
Lead Time	15‑20 days after confirmation
Port of Loading	Tianjin, Shanghai, Qingdao (other ports on request)
Shipping Options	FOB, CIF, CFR, DAP, DDP

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FAQ – FeSi 74% High‑Silicon Inoculant

❓ How does FeSi 74% compare with FeSi 72% or 75% in inoculation performance?+

FeSi 74% sits in the optimal silicon range (74‑77%) that offers a balanced combination of graphitizing power and cost‑effectiveness. Compared to FeSi 72%, it provides slightly stronger chill reduction due to higher silicon, while being more forgiving than FeSi 75% in terms of ferrite promotion and potential dross in ductile iron. It's a versatile choice for foundries that produce a mix of gray and ductile iron, ensuring consistent results across a wide sulfur range (0.005‑0.025% S).

Is it possible to entrust a third-party inspection to check the quality before shipment? +

Certainly, we support third-party inspections by internationally recognized quality inspection agencies such as SGS and BV to verify product quality before shipment. The inspection covers product appearance, weighing, dimensions, and chemical composition analysis. The entire inspection process will be documented with photos and written records, which will be provided to you together with the final inspection report. This ensures you have no concerns regarding product quality.

❓ What is the optimal base sulfur range for FeSi 74%?+

FeSi 74% performs excellently in irons with base sulfur between 0.008% and 0.020%. The alloy's aluminium and calcium content (≤1.5% Al, ≤1.0% Ca) supports the formation of effective sulfide and oxy‑sulfide nucleation sites. For lower sulfur melts (<0.008%), a slight sulfur addition or the use of a sulfur‑bearing inoculant may be beneficial; our engineers can advise on the best approach.

❓ Is FeSi 74% suitable for thin‑wall castings?+

Absolutely. With its high silicon content (74‑77%), FeSi 74% provides strong chill reduction in rapidly cooling sections. For thin‑wall castings (down to 3 mm), we recommend a finer particle size (e.g. 0.2‑0.8 mm) and addition as late as possible to maximize nucleation. Many foundries use it for automotive parts like brake discs and housings with excellent results.

❓ How does FeSi 74% compare with zirconium or rare‑earth based inoculants?+

Zirconium inoculants are specifically designed to combat nitrogen‑related porosity and often contain rare earths; they are more expensive and typically used for problem melts. Rare earth inoculants offer very strong nucleation but can be costly and sensitive to fading. FeSi 74% is a cost‑effective, general‑purpose inoculant that delivers reliable graphitization and chill control for most gray and ductile iron applications. For nitrogen‑sensitive irons, a blend with a small amount of Zr‑bearing alloy might be considered, but FeSi 74% alone is sufficient for the majority of castings.

❓ What storage conditions are recommended for FeSi 74%?+

FeSi 74% is not hygroscopic and can be stored in dry conditions (≤60% relative humidity) in sealed bags or silos. If stored in bulk for extended periods, occasional checking for fines and moisture is advisable. In case of dampness, drying at 80‑100°C for 1‑2 hours restores its flowability and performance. Avoid direct contact with water or rain.

❓ Can FeSi 74% be used together with a late‑stage inoculant?+

Yes, many foundries employ a duplex practice: using FeSi 74% as a primary ladle inoculant (0.3‑0.5%) to secure base graphitization, and then adding a small amount (0.1‑0.2%) of a stronger late‑stage inoculant (e.g., FeSiZr or a rare‑earth mix) during pouring. This combination maximizes nodule count in ductile iron or eliminates any residual chill in complex thin‑wall castings. We can recommend compatible late‑stage products for your specific needs.