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This product is known by 3 different names i.e. Alfin Rings/ RCP Inserts/ Groove Inserts Alfin Rings: Austenitic Cast Iron rings (Non-magnetic) popularly known as Al-Fin type to provide high wear resistance for longer life than normal pistons. These Ni Resist rings with high Nickel percentage, are cast in the piston by metallurgical bonding. This is particularly resistant to wear due to friction pounding. This is advantageous at high operating temperatures and pressures. RCP Inserts:- Mean Ring carrier piston insert, it is named so because it is used as carrier of compression (Top) ring in piston.

Groove Inserts:- It is named so as it is imbedded in the groove of piston during casting.

IMG_8504 2.HEIC

Technical Data:

Austenitic Ni Resist Cast Iron: A high heat resistance as well as a particularly high (or low) thermal coefficient of expansion belongs to the further extreme characteristics of Ni-resist. Ni-resist is erosion resistant, non-scaling and not magnetizable. The nickel quotient increases the tensile strength and the elongation of this material. Ni-resist does not form a passive layer in contact with sea water or alkaline materials. Ni-resist can be machined better than cast steel and is usually more economical to produce.

Application of Alfin Ring:

Alfin Ring is inserted in the top ring groove of the piston or in some designs the top two ring grooves are inserted with Alfin Rings. This ring groove means higher degree of wear resistant. These pistons are recommended for Heavy Duty Diesel Engines with turbo charger, Alfin Ring is machined from Centrifugal Casted Sleeve.


Melting is carried by induction furnace which is the best melting source for metals. It helps to attain perfect composition which is required. Instant carbon, silicon, carbon equivalent analyzers give us result before pouring and enables us to deliver perfect material.

melting process for alfin rings

Centrifugal Casting

First the non-magnetic sleeves are casted by centrifugal casting process on machines from CCMO Tulsa USA

centrifugal casting for alfin rings
centrifugally casted cylinders

Chemical Composition

  • C: 2-3%

  • Ni: 13.5-17.5%

  • Si-1-2.5%

  • S: < 0.12 %

  • Mn: 1-1.5%

  • P: < 0.12%

  • Cr: 1-2.5%

  • Cu: 5.5 - 7.5%

  • Fe: Rest

machined cylinders

Dry Machining

There is no casting defect and blow holes in the Centrifugal Casting, 

Advantages of Dry Machining:

1. Dry machining ensures absence of moisture/oil retention on the material which thereby results in more efficient bonding.

2. It gives Porosity & Blow holes free casting to the Piston.

3. This results in lower rejection level in bonding process vis-a-vis machining with coolants, Ensuring higher profitability at Customer end.

cnc machine


Each and every ring is blasted with fine shorts to remove burns & sharp edges

blasting machine


Our production facility is well supported by physical & chemical lab. We have Rockwell, BHN, Rockwell Superficial, Impact, UTM & Load test etc. in physical lab. Chemical lab is having facilities to detect Sulphur, Carbon, Silicon, Maganese, Nickel, Copper, Chrome etc.

testing facility for alfin rings

Vaccum Packing

Each and every ring is visually and dimensionaly checked by a team of people before they are packed in multiples 15 or 20.

vacuum packing for alfin rings
vacuum packing for alfin rings
Packed alfin rings
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