Ni Resist Cast Iron

Ni Resist Cast Iron

Ni-Resist-BS3468-1986-S2W-940kgsNi-Resist-BS3468-1986-S2W-870kgs

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.