Strontium-bearing ferrosilicon inoculant (Si 73-78%, Sr 0.6-1.0%) for grey and ductile iron. Strontium delivers potent graphite nucleation at a low addition rate with minimal silicon pickup, so it controls chill in thin and section-sensitive castings without raising eutectic cell count the way barium grades can. The result is a clean, uniform graphite structure, fewer edge and core carbides, and steadier mechanical properties from shot to shot. Fade resistance is strong, which suits longer pour windows and stream or in-mould dosing. Supplied in 0.2-0.7mm and 1-3mm sizings with COA + MTC on every lot.
Technical Specifications
Si
73-78%
Sr
0.6-1.0%
Ca
≤ 1.0%
Al
≤ 1.0%
Size
0.2-0.7mm / 1-3mm
Applications
Grey iron inoculation
Ductile iron inoculation
Fade resistance
Chill reduction
Thin-section castings
Frequently Asked Questions
When should I choose a strontium FeSi inoculant over barium or zirconium grades?
Reach for the FeSiSr grade (Si 73-78%, Sr 0.6-1.0%) when chill control in thin sections matters and you want a low addition rate with minimal silicon and trace-element pickup. Strontium is a powerful nucleant that does not raise eutectic cell count as much as barium, which helps avoid shrinkage in section-sensitive grey iron. Choose FeSiBa for routine, short-hold grey iron, or FeSiZr when you need maximum fade resistance and nuclei stability in ductile iron. Validate the pick with a chill wedge on your base metal.
What addition rate and method work best for FeSiSr?
Typical ladle additions run 0.05-0.20 wt% of metal poured — strontium's potency lets you dose at the low end versus barium grades. Use the 0.2-0.7mm fraction for stream and in-ladle inoculation and the 1-3mm fraction for in-mould or late dosing. Late, fine-particle additions maximise nuclei count and minimise fade. Start near 0.10 wt%, run a chill-wedge or microstructure check, then trim in 0.02-0.05 wt% steps to your section size and pour delay.
How is FeSiSr packaged, and what are lead time and MOQ?
The inoculant ships in moisture-resistant sealed bags on shrink-wrapped pallets, with the 0.2-0.7mm and 1-3mm sizings packed separately so you can stage stream versus in-mould use. Delivery terms include CIF Marmara and Gebze bonded stock for faster pulls. Container loads move as 20 MT FCL, with 5 MT LCL available for trials. Share your sizing split and target Sr level and we will confirm current lead time and minimum order against the call-off.
What quality documentation comes with each lot?
Every lot ships with a COA / MTC reporting Si, Sr, Ca and Al against the grade band, plus the sizing distribution for the requested fraction. Chemistry is determined by spectrometric/wet methods and sieve analysis confirms particle size. Multi-regional sourcing is screened to one specification so certified chemistry and sizing stay consistent lot to lot, and retained samples support any third-party recheck on receipt.
