Views: 0 Author: Site Editor Publish Time: 2026-05-08 Origin: Site
When it comes to secondary steelmaking and ladle injection, the particle size of your calcium silicon alloy is just as critical as its chemical composition. The 10-50mm lump has become the industry benchmark for wire feeding and cored wire production, as well as for direct ladle addition.
Our Calcium Silicon Lump is crushed and screened to a strict 10-50mm size range, ensuring minimal fines, high recovery rates, and stable molten bath reactions.
Unlike smaller chips that may oxidize before submersion or oversized lumps that cause splashing, the 10-50mm specification offers:
Rapid Submergence: The weight of a 10-50mm lump allows it to penetrate the slag layer instantly, reaching the molten steel without burning off.
Controlled Reaction Speed: This size range provides a balanced surface area—neither too fast (which causes violent spitting) nor too slow (which delays inclusion modification).
Reduced Fines Percentage: Proper screening means less than 3% undersized (below 10mm) and less than 5% oversized (above 50mm), saving you material costs.
Our calcium silicon alloy is produced in submerged arc furnaces using low-ash quartz and high-purity lime. Typical grades include:
| Element | Grade A (Standard) | Grade B (Low Al) |
|---|---|---|
| Calcium (Ca) | 30-33% | 28-31% |
| Silicon (Si) | 60-65% | 55-60% |
| Aluminum (Al) | ≤ 1.5% | ≤ 0.8% |
| Carbon (C) | ≤ 0.2% | ≤ 0.2% |
| Sulfur (S) | ≤ 0.03% | ≤ 0.03% |
| Phosphorus (P) | ≤ 0.03% | ≤ 0.03% |
Note: Low-aluminum (Low Al) grade is recommended for aluminum-killed steels to avoid re-oxidation issues.
Appearance: Silver-grey metallic luster, clean surface without visible slag inclusions.
Bulk Density: Approximately 2.2 – 2.4 g/cm³ (suitable for hopper feeding systems).
Packaging Options: 1 MT big bags (woven with inner PE liner), 25 kg small bags on pallets, or steel drums for humid climates.
For Cored Wire Manufacturing:
The 10-50mm size is ideal for crushing down to 0-2mm or 0-3mm powder. However, many wire plants prefer to buy pre-crushed 10-50mm lumps because they produce less dust during their own secondary crushing compared to mixed-size material.
For Direct Ladle Addition (Dump & Cover Method):
Metallurgists confirm that lumps below 10mm tend to float on slag, while lumps above 50mm take too long to dissolve. The 10-50mm calcium silicon lump hits the sweet spot for dissolution kinetics in 150-300 ton ladles.
We do not simply claim "10-50mm." Each production lot undergoes:
Sieve Analysis: Three random samples per 20 MT to verify the size distribution (90% min within 10-50mm).
XRF Spectrometry: For real-time chemistry verification.
Dust & Moisture Test: Ensuring dry product for safe shipping.
A Mill Test Certificate (MTC) is provided with every shipment, showing actual values for Ca, Si, Al, C, S, P, and the screen analysis report.
To prevent degradation during sea freight, we use:
Waterproof inner liner to block humidity (prevents Ca hydration).
Reinforced woven outer bag resistant to tearing during container loading.
Steel strapping on pallets for easy forklift handling.
Common loading options:
25 MT per 20' FCL (palletized)
27 MT per 20' FCL (bulk bags, floor-loaded)
Steel mills producing tire cord, bearing steel, or pipeline steel (API 5L).
Foundries requiring inclusion shape control in ductile iron.
Master alloy manufacturers blend CaSi for specialty inoculants.
Consistent sizing: We operate two dedicated screening lines for this exact range.
Competitive lead time: 15-20 days from order to loading (stock available).
Third-party inspection: SGS, BV, or AHK inspection allowed at buyer’s cost.
Flexible payment: L/C at sight, T/T, or DP for repeat customers.
Q: Can you supply 10-50mm with Ca > 32%?
A: Yes, upon request we can adjust the furnace mix to achieve 32-34% Ca, though this may affect silicon content slightly.
Q: How do you control fines (below 10mm)?
A: After jaw crushing, we use a double-deck vibratory screen. Fines are recycled back into the furnace or sold separately as CaSi powder.
Q: Is this product suitable for argon stirring ladles?
A: Absolutely. The 10-50mm lump size is preferred for argon-stirred ladles because it stays suspended in the vortex rather than sinking to the bottom.
Q: Do you offer free samples?
A: We provide 2 kg free samples for freight collect. A sample MTC and sieve report will accompany the sample.
Tell us your target calcium percentage and monthly tonnage. Hongshun will reply within 8 hours with a proforma invoice, packing photos from the last shipment of 10-50mm calcium silicon lumps, and a lead time for your port.
