1. Composition Differences and Active Alloy Content
The core distinction lies in the alloy composition:
Ca30Si60: higher calcium and higher silicon
Ca28Si58: slightly lower levels of both elements
Why it matters:
Higher Ca and Si content means more active alloying agents per kilogram, leading to:
stronger deoxidation,
faster reaction with oxygen,
more effective inclusion modification.
Ca30Si60 therefore delivers more metallurgical value per ton, especially in clean-steel applications.
2. Deoxidation Efficiency
Both grades are effective deoxidizers, but performance differs:
Ca30Si60:
stronger oxygen removal capability,
quicker response after addition,
more stable effects in variable furnace conditions.
Ca28Si58:
effective for standard-grade steels,
suitable for routine deoxidation processes,
may require slightly higher dosing to reach the same deoxidation level.
This makes Ca30Si60 preferred when steel quality targets are demanding.
3. Calcium Recovery and Inclusion Modification
Calcium recovery plays a key role in steel cleanliness and casting performance.
Ca30Si60:
tends to achieve better Ca recovery,
produces more effective inclusion modification,
reduces nozzle clogging risk during continuous casting,
helps generate smoother cast surfaces.
Ca28Si58:
acceptable recovery for regular steel grades,
performance more sensitive to addition timing or slag conditions.
For mills prioritizing stable casting conditions, Ca30Si60 generally performs better.
4. Steel Cleanliness and Casting Behavior
The ability to transform hard, angular inclusions into softer, rounded forms is critical in modern steelmaking.
Ca30Si60 provides stronger inclusion modification, leading to cleaner steel and improved casting flow.
Ca28Si58 works well for non-critical applications where inclusion control is less demanding.
When downstream surface quality or casting yield matters, Ca30Si60 often delivers a measurable advantage.
5. Cost vs. Performance Balance
The two alloys are close in price, but they offer different value profiles.
Ca30Si60:
delivers more alloying effect per ton,
improves overall refining efficiency,
helps reduce total consumption in high-performance steels.
Ca28Si58:
provides a cost-efficient option for routine steel grades,
ideal for large-volume operations where alloying demands are moderate,
offers stable performance at a lower metallurgical intensity.
In short:
Ca30Si60 = higher efficiency and stronger effects
Ca28Si58 = economical and widely applicable
6. Which grade should mills choose?
Choose Ca30Si60 when:
steel cleanliness is important
inclusion modification affects casting productivity
you need stable calcium recovery
alloy consumption must be minimized
performance matters more than small price differences
Choose Ca28Si58 when:
cost control is key
steel grades are standard and not clean-steel critical
routine deoxidation is the main purpose
you require a dependable, economical Ca-Si addition
If you're comparing Ca30Si60 and Ca28Si58 for your steelmaking process, I can help evaluate recovery expectations, consumption rates, and cost-performance under your exact production conditions.
We supply both grades with stable chemistry, consistent sizing, and flexible loading schedules from Tianjin Port.
Share your quantity, destination, and shipment window, and I'll prepare a clear side-by-side quotation to support your next purchase.
