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Materials

With a comprehensive catalogue of cast iron specifications on offer including compacted graphite iron (also known as vermicular), PPUK has a wealth of material specifications on hand covering a wide variety of dimensional options to support all current market demands for piston rings. Fully sourced within the UK to the highest possible standard, our cast iron material grades are unsurpassed in the market for operational performance. In addition PPUK has access to a wide range of alloy based materials to support the growing demands seen within a variety of industries which utilise metallic sealing rings. If you need any assistance in finding the right product for your application, please contact us

Piston Ring Materials Specification - P1

Application:
Large bore 2 stroke diesel engines fitted with PVA cylinder liners

Photo-Micrographs
P1

Microstructure:
Pearlitic matrix with less than 3% ferrite and evenly distributed phosphides eutectics.  Flake graphite I-A 3/5 (ISO 945 – 1975 (E))

Typical Chemical Composition:

Carbon          3.30
Silicon           1.30
Sulphur        0.08
Manganese  0.90
Chromium   0.05
Copper          0.10
Phosphorus  0.25
Other elements may be present only at trace levels

Mechanical Properties:
Hardness  200 HB
Elastic Modulus 110 kNmm-2
Bending Strength 500 Nmm-2

Piston Ring Materials Specification - P2

Application
Large bore 2-stroke diesel engines with Tarkalloy cylinder liners. Gives good wear properties and may be used with chromed cylinder liners.

Photo-Micrographs
P2

Microstructure
Pearlitic matrix with less than 3% ferrite and evenly distributed phosphides eutectics.  Flake graphite I-A + B 3/5 (ISO 945 – 1975 (E))

Typical Chemical Composition

Carbon          3.15
Silicon           1.30
Sulphur         0.08
Manganese   0.90
Chromium    0.15
Copper          0.25
Phosphorus  0.25

Other elements may be present only at trace levels

Mechanical Properties
Hardness     205 HB
Elastic Modules    110 kNmm-2
Bending Strength    500 Nmm-2

Piston Ring Materials Specification - P3

Application
Large bore 2-stroke diesel engines, gives good strength and wear properties.

Photo-Micrographs
P3

Microstructure
Pearlitic matrix with less than 3% ferrite and evenly distributed phosphides eutectics.  Flake graphite I-A 3/5 (ISO 945 – 1975 (E))

Typical Chemical Composition

Carbon          3.25
Silicon           1.30
Sulphur         0.08
Manganese   0.90
Molybdenum 0.50
Copper          0.50
Phosphorus  0.20

Other elements may be present only at trace levels

Mechanical Properties
Hardness     215 HB
Elastic Modulus     115 kNmm-2
Bending Strength     520 Nmm-2

Piston Ring Materials Specification - P4

Application

The high duty piston ring cast iron may be used in marine diesel engines where increased ring toughness is required. 
It is normally used to provide resistance to ring breakage with excellent wear properties.

Photo-Micrographs
P4

Microstructure
Pearlitic matrix with less than 3% ferrite and evenly distributed phosphides eutectics.  Flake graphite I-A 3/5 (ISO 945 – 1975 (E))

Typical Chemical Composition

Carbon                      3.10
Silicon                       1.55
Sulphur                    0.08
Manganese              0.85
Chromium               0.15
Molybdenum          0.60
Phosphorus             0.10
Vanadium                0.15
Copper                     0.85
Titanium                 0.05
Nickel                      0.35

Other elements may be present only at trace levels

Mechanical Properties

Hardness     230 HB
Elastic Modulus    125 kNmm-2
Bending Strength    620 Nmm-2

Piston Ring Materials Specification - P5

Application

The high duty piston ring cast iron may be used in marine diesel engines where increased ring toughness is required. 
It is normally used to provide resistance to ring breakage with excellent wear properties.

Photo-Micrographs
P5

Microstructure
Pearlitic matrix with less than 3% ferrite and evenly distributed phosphides eutectics.  Flake graphite I-A 3/5 (ISO 945 – 1975 (E))

Typical Chemical Composition

Carbon                      3.10
Silicon                       1.20
Sulphur                    0.08
Manganese              0.90
Molybdenum          0.60
Copper                     0.85
Phosphorus             0.10

Other elements may be present only at trace levels

Mechanical Properties
Hardness     225 HB
Elastic Modulus    120 kNmm-2
Bending Strength    600 Nmm-2

Piston Ring Materials Specification - P7

Application

This material enjoys good strength resistance combined with excellent wear properties. It is suitable for diesel engines and some industrial applications such as compressors

 

Photo-Micrographs

p7

Microstructure

Pearlitic matrix with less than 3% ferrite and less than 3% cementite.  Phosphides eutectics present as network.  Flake graphite I-A 3/5 (ISO 945 – 1975 (E))

Typical Chemical Composition

Carbon              3.25
Silicon               1.30
Sulphur             0.10
Manganese       0.85
Molybdenum   0.10
Copper              0.20
Phosphorus      0.30

Other elements may be present only at trace levels

Mechanical Properties

Hardness                200 HB
Elastic Modulus    103 kNmm-2
Bending Strength 495 Nmm-2

Piston Ring Materials Specification - P10

Application
For the latest generation 2 stroke diesel engines.

Photo-Micrographs
P10

Microstructure
Pearlitic matrix with less than 5% ferrite and 3% Cementite. Phosphide eutectic present as isolated crystals. Nodular graphite III (4/6) – max 20% V + IV + VI (ISO 945 – 1975 (E))

Typical Chemical Composition

Carbon               3.55
Silicon                2.00
Manganese        0.90
Molybdenum    0.50
Titanium           0.10
Phosphorus      0.10
Copper              1.00
Chromium       0.35

Other elements may be present only at trace levels

Mechanical Properties
Hardness   250 HB
Elastic Modulus   150 kNmm-2
Bending Strength   750 Nmm-2

Piston Ring Materials Specification - P13

Application

Various industrial applications

Photo-Micrographs
P13

Microstructure
Pearlitic matrix with approximately 20% ferrite. Nodular graphite type I & II (ASTM A247)

Typical Chemical Composition

Carbon          3.60
Silicon           2.70
Manganese  0.20
Copper          1.00
Phosphorus  0.10
Magnesium   0.05

Other elements may be present only at trace levels

Mechanical Properties
Hardness     192 HB
Elastic Modulus    174 kNmm-2
Bending Strength    870 Nmm-2
Tensile Strength    600 Nmm-2

Piston Ring Materials Specification - P14

Application
High strength rings for various applications.

Photo-Micrographs
P14

Microstructure
Pearlitic matrix with approximately 5% ferrite Graphite VI + V (ISO 945 – 1975 (E))

Typical Chemical Composition

Carbon          3.60
Silicon           2.15
Sulphur         0.01
Manganese   0.50
Chromium    0.05
Copper          0.75
Phosphorus  0.04
Molybdenum 0.40
Vanadium     0.03
Titanium       0.02
Nickel             0.20
Magnesium   0.06

Other elements may be present only at trace levels

Mechanical Properties
Hardness     260 HB
Elastic Modulus    170 kNmm-2
Bending Strength    900 Nmm-2
Tensile Strength    700 Nmm-2

Piston Ring Materials Specification - P19

Application
General cast iron used for smaller rings.

Photo-Micrographs
P19

Microstructure

Pearlitic matrix with less than 5% ferrite, uniformly distributed flake graphite

Typical Chemical Composition

Carbon          3.40
Silicon           2.20
Sulphur         0.12
Manganese   0.75
Chromium    0.50
Copper          0.50
Phosphorus  0.40

Other elements may be present only at trace levels

Mechanical Properties
Hardness     240 HB
Elastic Modulus     90 kNmm-²
Bending Strength    300 Nmm-²

Piston Ring Materials Specification - P20

Application
High duty 4-stroke engines.

Photo-Micrographs
P20

Microstructure
The matrix consists of tempered martensite with evenly distributed carbides. Graphite VI (6-8)

Typical Chemical Composition

Carbon                      3.40
Silicon                       2.40
Sulphur                    0.05
Manganese              0.35
Molybdenum          0.20
Copper                     0.30
Phosphorus            0.30
Magnesium            0.05

Other elements may be present only at trace levels

Mechanical Properties
Hardness     370 HB
Elastic Modulus    140 kNmm-²
Bending Strength    1100 Nmm-²

Piston Ring Materials Specification - P24

Application
Various industrial applications.

Photo-Micrographs

P24

 

 

 

 

 

 

 

 

Microstructure
Pearlitic with ferrite 47 – 53%. Graphite spheroidal and free of flakes

Typical Chemical Composition

Carbon          3.55
Silicon           2.25
Nickel            –
Manganese  0.40
Chromium    –
Phosphorus  0.05

Other elements may be present only at trace levels.

Mechanical Properties
Hardness              200 HB
Elastic Modulus  169 kNmm-²
Tensile Strength  500 Nmm²

Piston Ring Materials Specification - P25

Application
Various industrial applications.

Photo-Micrographs
P25

Microstructure
Austenitic matrix containing some carbides. Graphite spheroidal and free of flakes

Typical Chemical Composition

Carbon          2.60
Silicon           2.15
Nickel           30.00
Manganese  1.00
Chromium   3.00
Phosphorus  0.08

Other elements may be present only at trace levels.

Mechanical Properties
Hardness             170 HB
Elastic Modulus  92 kNmm-²
Tensile Strength 379 Nmm²