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FERRONICKEL VS NPI: TWO DIFFERENT PRODUCTS
INTERNATIONAL NICKEL STUDY GROUP October 5-6, 2010
Denis LENCOU-BARE LENCOU-BAREME ME
DES ALLIAGES, DES MINERAIS ET DES HOMMES.
Nickel Pig Iron: a substitute to FeNi ? Product analysis a) ISO classification: Chemical Chemical analysis analysis FeNi (*)
(*)
Physical Physical aspect/size aspect/size
Ni
C
Si
P
S
15-80%
Max 2.5%
Max 4%
Max 0.030%
Max 0.40%
Cr Max
2%
Chips size between 2 and 50mm
According According to ISO6501 ISO6501 norm "FeNi-spe "FeNi-specifica cification tion and delivery delivery requirem requirement" ent" NPI not ISO standardized
There is confusion in China between Nickel Pig Iron and Ferronickel. Ferronickell according to ISO norm must have Ferronicke have a minimum content of 15% nickel. Therefore Nickel Pig Iron produced in China cannot be called Ferronickell for at least 95% of the production available on the market. Ferronicke
Source: Eramet Eramet Ni Research - 2 / 7
Nickel Pig Iron: no substitute in terms of quality Product analysis b) Comparison of a 25% Ni FeNi * and a 5% Ni NPI Chemical analysis 25% FeNi*
Ni
C
Si
P
S
Cr
25%
1.5%
1%
0.010%
0.050%
0.6%
NPI 5% Ni
5%
6%
6%
0.040%
0.060%
6%
impurities
• 20 times more P in NPI
Kg per ton Ni
P
S
than in FeNi • 6 times more S in NPI than in FeNi
In 25% FeNi *
0.4
2
In NPI 5% Ni
8
12
* In example typical analysis of SLN25 used as reference Source: Eramet Ni Research - 3 / 7
Differentiating Ferronickel from Nickel Pig Iron Product form Ferronickel in shots (such as SLN25)
Nickel Pig Iron
= Uneven Ingot shape
Grain size: 4-60mm Free of fines Source: Eramet Ni Research - 4 / 7
Differentiating Ferronickel from Nickel Pig Iron
Sampling and analysis Homogenized analysis for FeNi (for example 1 analysis per lot for SLN25) :
> Enormous simplification for stainless steel makers, avoiding numerous and costly systematic sampling and analysis operations.
Source: Eramet Ni Research - 5 / 7
Differentiating Ferronickel from Nickel Pig Iron
Consistency of quality thanks to upstream integration FeNi producers integrated up to ore extraction can offer:
Accurate technical specification meeting stainless steel makers requirements, such as low P content
Reliability on the respect of the specification, on time shipments with quantity and quality as per contract requirements.
Source: Eramet Ni Research - 6 / 7
Differentiating Ferronickel from Nickel Pig Iron High usage value of FeNi as specialty product qualified for converter use EAF use NPI / NBF
Charge product in basket
AOD use Not optimized (Impurities, size)
Used in continuous additions : FeNi (at 22% or above)
In basket or through EAF roof
Controls Liquid metal temperature
Increases AOD productivity, with more tons/minute