Product Overview

FeSiMg (Ferro Silicon Magnesium) is a specialized nodularizing inoculant designed for the production of high-quality ductile cast iron (SGI/Spheroidal Graphite Iron). By combining the spheroidizing power of magnesium with the nucleation efficiency of silicon, FeSiMg ensures consistent nodularity, high nodule count, and excellent mechanical performance across a wide range of casting applications-from automotive components to heavy machinery parts.

Key Features

Optimized Magnesium Content (4–10%) – Neutralizes sulfur and oxygen to form compact, spherical graphite nodules.

Silicon Carrier (45–65%) – Promotes graphitization and provides strong inoculation effects.

Controlled Rare Earth (RE) Additions – Enhances nodule consistency and reduces section sensitivity, especially in thick-walled castings.

Low Oxide Formation – Minimizes slag defects and improves melt cleanliness.

Customizable Granulometry – Available in lump, crushed, or cored wire form to suit different foundry processes (sandwich, tundish, or wire feeding).

Technical Specifications (Typical Grade)

Element	Weight %
Magnesium (Mg)	5.5 – 6.5%
Silicon (Si)	45 – 50%
Rare Earth (RE)	0.5 – 1.2%
Calcium (Ca)	1.0 – 2.0%
Aluminum (Al)	≤ 0.5%
Iron (Fe)	Balance

Custom grades available upon request.

Key Benefits for Foundries

Benefit	Description
High Nodularity (85–95%)	Consistent spherical graphite structure ensures superior ductility and fatigue resistance.
Increased Nodule Count	Achieves >300 nodules/mm², directly improving tensile strength and elongation.
Reduced Chill & Carbides	Effective inoculation prevents hard, brittle phases in thin sections.
Wider Processing Window	Allows longer pouring times (8–12 minutes) before Mg fading affects quality.
Lower Reject Rates	Minimizes shrinkage porosity, chunky graphite, and nodule degeneration.

silicon-magnesium

Case Study: Automotive Suspension Arm Manufacturer

Background

A mid-sized European foundry producing ductile iron automotive suspension arms (GJS-500-7 grade, ASTM A536 65-45-12) was facing quality challenges. Their reject rate due to low nodularity (below 75%) and excessive carbide formation in thin-walled sections (5–6 mm) had reached 8.5%, driving up costs and delaying deliveries.

Challenge

Inconsistent magnesium recovery (only 55–60%) using conventional FeSiMg lumps in a sandwich treatment.

Severe Mg fading when pouring multiple molds from a single ladle (pouring time >12 minutes).

High sulfur content in the base iron (0.025–0.030% S) consuming Mg prematurely.

Solution Implemented

The foundry switched to a custom FeSiMg alloy with:

6.2% Mg (moderate level for better control)

1.0% Rare Earth (to counteract tramp elements and stabilize nodularity)

Cored wire form (13 mm diameter) fed in-stream at 25 m/min

Process changes:

Reduced initial sulfur to <0.015% via magnesium desulfurization pretreatment.

Adopted wire feeding inoculation with FeSiMg, pouring within 8 minutes of treatment.

Results (After 3 Months)

Parameter	Before	After (FeSiMg Wire)	Improvement
Nodularity (%)	72–78%	90–94%	+18%
Nodule Count (nod/mm²)	180–220	350–410	+86%
Carbide area (%)	4.5%	<0.8%	-82%
Mg recovery rate	58%	83%	+43%
Reject rate	8.5%	2.1%	-75%
Tensile Strength (MPa)	485	545	+12%
Elongation (%)	6.5%	10.2%	+57%

Customer Feedback

"Switching to FeSiMg cored wire transformed our production line. Not only did our nodularity exceed OEM requirements (≥90%), but we also reduced scrap by over 75% in just three months. The consistency from ladle to ladle is remarkable."
- Production Manager, European Automotive Foundry