Ferro phosphorus (FeP) delivers phosphorus as a controlled, dissolvable unit into iron and steel melts, avoiding the violent reaction and fume losses of elemental phosphorus. In the bath, P partitions into the matrix to raise electrical resistivity and strengthen ferrite by solid solution, while lowering surface tension to improve melt fluidity and mold filling. P also promotes the dense, adherent oxide patina that gives weathering steel its atmospheric-corrosion resistance. Typical use spans weathering (COR-TEN) and free-machining steels, soft-magnetic alloys, and thin-section gray and ductile cast iron. Addition rates are modest, on the order of 0.1-1.0 wt% depending on the target P aim and recovery. This grade analyzes P 23-26%, with Si ≤ 4.0%, Mn ≤ 5.0%, C ≤ 1.0%, and Ti ≤ 1.0%, sized 10-100 mm for predictable dissolution and accurate ladle dosing in EAF and foundry practice. Each lot ships with COA and MTC, drawn from multi-regional sourcing, on CIF Marmara terms via Gebze bonded warehouse, in 20 MT FCL or 5 MT LCL lots. Send your target P range and tonnage for an RFQ.
Specifiche tecniche
P
23-26%
Si
≤ 4.0%
Mn
≤ 5.0%
C
≤ 1.0%
Ti
≤ 1.0%
Granulometria
10-100mm
Applicazioni
Weathering (COR-TEN) steel
Free-machining steel
Soft-magnetic alloys
Cast iron fluidity
Domande frequenti
Which FeP grade and spec should I select for weathering versus free-machining steel?
A single grade at P 23-26% covers both routes; what matters is matching residual limits to your heat. For COR-TEN weathering steel, P is the deliberate corrosion-resistance addition, so the ≤4.0% Si and ≤5.0% Mn ceilings keep your alloy balance clean. For free-machining grades where P aids chip breakage, the ≤1.0% C and ≤1.0% Ti limits avoid unwanted carbide or inclusion effects. Confirm your target residual P on the COA before charging.
What dosage and addition practice apply for ferro phosphorus?
Dose to your target residual P, not a fixed rate. For weathering steel, aim P around 0.07-0.15 wt% in the finished steel; free-machining grades often run higher. Compute charge from the 23-26% P assay and expected recovery, which is typically high since FeP dissolves readily. Add to a settled bath rather than during vigorous boil to limit loss, then sample and trim. Lump 10-100mm suits ladle or furnace addition without excessive fume.
How is FeP packaged, and what are typical lead time and MOQ terms?
Standard lump sizing is 10-100mm, supplied in 1 MT big bags or steel drums on pallets, sealed against moisture pickup. Order quantities scale to container economics: 20 MT FCL for full loads, with 5 MT LCL available for trial or top-up volumes. Delivery is offered CIF Marmara or ex Gebze bonded stock. Lead time depends on lot availability and sizing; confirm against your charge schedule when you request a quotation.
What quality documentation and testing accompany each lot?
Each shipment ships with a mill test certificate and COA reporting P, Si, Mn, C and Ti against the stated ranges. Chemistry is determined by spectrometric or wet-chemical methods; sizing is sieve-verified to the 10-100mm band. Third-party SGS or Intertek inspection at load port can be arranged on request, and retained samples support any re-check. Review the COA element-by-element before charging, since residual P control is the whole point of the addition.
Can FeP be substituted, and when should I consider alternatives?
For bulk P alloying in steel and cast iron, FeP at 23-26% P is the standard carrier and is hard to displace on cost per P unit. Where you need P without iron dilution or with tighter residuals, phosphorus-bearing master alloys or copper-phosphorus exist, but they suit narrower niches. For cast iron fluidity, FeP remains the practical route. Multi-regional sourcing keeps grade continuity, so spec to the P range and residual ceilings rather than to a single origin.
