Question 1

How do I choose between pure Ca cored wire and CaSi or CaFe wire for my ladle treatment?

Accepted Answer

Pure Ca wire (Ca ≥ 98%) delivers the highest calcium per metre with no Si or Fe pickup, so it suits clean-steel and low-Si grades where added silicon is undesirable. CaSi wire adds Si and is common for plain carbon steels that tolerate it. CaFe is milder and easier to feed. Match the wire to your residual chemistry limits and the recovery you need; pure Ca gives the most efficient Ca addition per metre fed.

Question 2

What feed rate and dosage should I use for inclusion modification?

Accepted Answer

Calcium treatment is dosed to hit a target Ca/S or Ca/Al2O3 ratio for full sulphide and alumina modification, typically a few tenths of a kg Ca per tonne of steel. With ~195 g powder per metre and Ca ≥ 98%, you back-calculate metres fed from your target Ca addition and expected recovery. Feed speed (often 150-300 m/min) is set so the wire melts at depth, minimising fade and re-oxidation. Validate by Ca and S analysis after treatment.

Question 3

What coil size, packaging and lead time apply, and is there a minimum order?

Accepted Answer

Wire is supplied on coils of roughly 1.8-2.0 t at 9mm diameter, on returnable or one-way carriers suited to standard wire-feeding machines, wrapped against moisture. Bonded stock at Gebze supports faster fulfilment, with FCL (20 MT) and LCL (5 MT) options for mixed loads. Lead time depends on coil count, finishing and delivery terms (CIF Marmara or ex-bonded). Share your tonnage and feeder spec and we confirm coil count, MOQ and schedule.

Question 4

What quality documentation and testing do you provide?

Accepted Answer

Each lot ships with a COA/MTC stating calcium content (Ca ≥ 98%), powder fill weight per metre, wire diameter (9mm) and low-carbon steel sheath data. Fill consistency governs dosing accuracy, so powder loading per metre is checked across the coil. On request we can align reporting to ISO/ASTM sampling practice and include element analysis of the calcium charge so your metallurgists can verify recovery against feed-rate calculations.

Question 5

Can pure Ca cored wire be substituted with lump CaSi or with CaSi cored wire?

Accepted Answer

Lump or briquetted CaSi added to the ladle gives poor, erratic Ca recovery because calcium boils at steel temperatures and floats off; cored wire fed deep into the melt is the standard route for repeatable recovery. If your grade tolerates silicon, CaSi cored wire is a valid alternative and is often cheaper per kg Ca. For low-Si or clean-steel grades, pure Ca wire avoids unwanted Si pickup, which CaSi cannot.

Ca	≥ 98%
Wire Ø	9mm
Powder	≈ 195 g/m
Sheath	low-carbon steel
Coil Weight	~1.8-2.0 t

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