Ni Resist castings can be specified in either a Grey Iron base material or a SG Iron based material. These materials have been developed to offer good resistance to sea water and alkaline corrosion,scaling resistance,thermal expansion,frictional wear,oxidation,structural stability,cryogenic applications and erosion.
Ni Resist can also be used for applications where non magnetisable features are required.
The benefits of Ni Resist Cast Iron are:
Cost
When compared to stainless steel castings,Ni Resist castings can offer price advantages. Ni Resist castings are lighter than stainless steel castings. They can be cast near to final shape
Machining
Ni Resist is easier to machine than stainless steel. Machining allowances are lower on Ni Resist castings when compared to stainless steel.
Castability
As with Grey Iron and SG Iron,Ni Resist castings offer all of the design benefits associated with Iron Castings. Complex shapes can be accommodated,excellent surface finish will be achieved and complex designs can be undertaken.
Ni-Resist Specification BS 3468 1986
Type
|
Grade
|
Chemical Composition
|
||||||||
C%max.
|
Si%
|
Mn%
|
Ni%
|
Cu%
|
Cr%
|
Nb%
|
P%max
|
Mg%
|
||
Flake Graphite
|
F1
|
3.0
|
1.5 – 2.8
|
0.5 – 1.5
|
13.5 – 17.5
|
5.5 – 7.5
|
1.0 – 2.5
|
–
|
0.2
|
–
|
F2
|
3.0
|
1.5 – 2.8
|
0.5 – 1.5
|
18.0 – 22.0
|
0.5 max
|
1.5 – 2.5
|
–
|
0.2
|
–
|
|
F3
|
2.5
|
1.5 – 2.8
|
0.5 – 1.5
|
28.0 – 32.0
|
0.5 max
|
2.5 – 3.5
|
–
|
0.2
|
–
|
|
Spheroidal Graphite
|
S2
|
3.0
|
1.5 – 2.8
|
0.5 – 1.5
|
18.0 – 22.0
|
0.5 max
|
1.5 – 2.5
|
–
|
0.08
|
|
S2B
|
3.0
|
1.5 – 2.8
|
0.5 – 1.5
|
18.0 – 22.0
|
0.5 max
|
2.5 – 3.5
|
–
|
0.08
|
–
|
|
S2C
|
3.0
|
1.5 – 2.8
|
1.5 – 2.5
|
21.0 – 24.0
|
0.5 max
|
0.5 max
|
–
|
0.08
|
–
|
|
S2M
|
3.0
|
1.5 – 2.5
|
4.0 – 4.5
|
21.0 – 24.0
|
0.5 max
|
0.2 max
|
–
|
0.08
|
–
|
|
S2W
|
3.0
|
1.5 – 2.2
|
0.5 – 1.5
|
18.0 – 22.0
|
0.5 max
|
1.5 – 2.2
|
0.12 – 0.2
|
0.05
|
0.06max*
|
|
S3
|
2.5
|
1.5 – 2.8
|
0.5 – 1.5
|
28.0 – 32.0
|
0.5 max
|
2.5 – 3.5
|
–
|
0.08
|
–
|
|
S5S
|
2.2
|
4.8 – 5.4
|
1.0 max
|
34.0 – 36.0
|
0.5 max
|
1.5 – 2.5
|
–
|
0.08
|
–
|
|
S6
|
3.0
|
1.5 – 2.8
|
6.0 – 7.0
|
12.0 – 14.0
|
0.5 max
|
0.2 max
|
–
|
0.08
|
–
|
Austenitic Cast Iron Specifications in accordance with BS 3468 1986
Type
|
Grade
|
Tensile Strength
(min) N/mm2 |
0.2% Proof Stress (info only)
|
Elongation % (info only)
|
Charpy V notch @ 20C (J)
|
Brinell Hardness BHN
|
Typical Properties/Uses
|
Flake Graphite
|
F1
|
170
|
–
|
1 – 2
|
–
|
140 – 220
|
Good corrosion and heat resistance combined with good bearing properties. Uses include Marine,furnace,pumps and valves.
|
F2
|
170
|
–
|
1 – 3
|
–
|
140 – 220
|
Similar to F1 but has greater alkali corrosion resistance. For use in pumps for soap,food and plastics manufacture.
|
|
F3
|
190
|
–
|
1 – 3
|
–
|
120 – 215
|
Erosion resistance in wet steam and salt slurry. Good thermal shock resistance up to 800c along with good high temperature corrosion resistance. Uses include Exhaust gas manifolds,turbocharger housings,filters,pumps and valves.
|
|
Spheroidal Graphite
|
S2
|
370
|
210
|
7 – 20
|
4 – 20
|
140 – 230
|
Corrosion and heat resistance similar to F1 but with superior mechanical properties. Typical uses include exhaust manifolds for use up to 750c,pumps,valves and turbocharger parts.
|
S2B
|
370
|
210
|
7 – 20
|
4 – 10
|
140 – 230
|
Better corrosion resistance to that of grade S2 due to presence of Chromium but a harder alloy to ensure freedom from porosity in. Typical uses include exhaust manifolds for use up to 750c,pumps,valves and turbocharger parts.
|
|
S2C
|
370
|
170
|
20 – 40
|
20 – 30
|
130 – 170
|
Non-magnetic with good impact properties down to -100c. Lower corrosion and heat resistance than S1. Typical uses include non-magnetic components for generator sets,insulator flanges and for moderate cryogenic applications.
|
|
S2M
|
420
|
210
|
25 – 45
|
15 – 25
|
150 – 180
|
Non-magnetic with mechanical properties maintained down to -150c. Uses include cryogenic components for use down to liquid nitrogen temperatures.
|
|
S2W
|
370
|
210
|
7 – 20
|
10 – 20
|
140 – 200
|
Corrosion and heat resistance similar to F1 but with superior mechanical properties. Typical uses include exhaust manifolds for use up to 750c,pumps,valves,and turbocharger parts. S2W has improved weldability compared with grade S2.
|
|
S3
|
370
|
210
|
7 – 18
|
4 – 20
|
130 – 200
|
Similar to grade F3 but with enhanced mechanical properties. Uses include exhaust gas manifolds,turbocharger housings,filters,pumps and valves.
|
|
S5S
|
370
|
210
|
7 – 20
|
–
|
130 – 180
|
Very good resistance to growth and scaling up to 850c combined with good thermal shock resistance. Used for turbocharger housings,support rings,exhaust gas manifolds and dieblocks for titanium pressings.
|
|
S6
|
390
|
200
|
15 – 25
|
15 – 25
|
130 – 170
|
Non-magnetic,used for covers for turbine generator sets ducts and terminals.
|
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