Piston rings materials

Unalloyed, non heat treated grey cast iron
ISO 6621-3, Class 10 - Subclass MC12

Caber Ref. ISO 6621-3: 1990 DIN 34109 (ex 70909) GOETZE
Gh. STD Class 10 subclass MC12 Non heated grey cast iron K1 - GOE 12

Gh. STD Chemical composition (%)
C Si Mn P S Cr Mo V Cu Ni Fe
Min 3,4 2,2 0,5 0,3 - 0,1 - - 0,1 - Rest
Max 3,9 3,2 1 0,6 0,13 0,4 - 0,15 0,7 -

Mechanical properties

Hardness (N/mm2)

HRB  94  ÷  106

HB 200 ÷ 290

Bending strength (N/mm2)

> min. 350

Modulus of elasticity E (N/mm2)

85000  ÷  115000

Density (g/cm3)

7.3

Microstructure

Graphite

Predominantly flaky and uniformly distributed

Matrix

Pearlite, ferrite not exceeding 5% 

Phosphide eutectic

Evenly distributed

Cementite

Absent

Unalloyed, non heat treated grey cast iron
ISO 6621-3, Class 10 - Subclass MC13

Caber Ref. ISO 6621-3: 1990 DIN 34109 (ex 70909) GOETZE
Gh. J Class 10 subclass MC13 Non heated grey cast iron GOE 13 (ex K25)

Gh. J Chemical composition (%)
C Si Mn P S Cr Mo V Cu Ni Fe
Min 2,8 2,0 0,5 0,3 - 0,15 - - 0,2 - Rest
Max 3,8 3,0 0,9 0,7 0,15 0,6 - 0,2 0,8 -

Mechanical properties

Hardness (N/mm2)

HRB  97   ÷  108

HB 200 ÷ 320

Bending strength (N/mm2)

min. 420

Modulus of elasticity E (N/mm2)

95000   ÷  125000

Microstructure

Graphite

Predominantly flaky and uniformly distributed

Matrix

Tempered martensite

Phosphide eutectic

Predominantly non-continuous network

Alloyed, heat treated grey cast iron

ISO 6621-3, Class 20- Subclass MC24

Caber Ref. ISO 6621-3: 1990 DIN 34109 (ex 70909) GOETZE
Gh. I Class 20 subclass MC24 G3 (heat – treated grey cast iron) K4 - IKA

Gh. I Chemical composition (%)
C Si Mn P S Cr Mo V Cu Ni Fe
Min 3,1 2,3 0,5 - - 0,3 0,7 - 0,7 0,4 Rest
Max 3,7 3,1 0,8 0,4 0,1 0,7 1,2 0,3 1,3 0,9

Mechanical properties

Hardness (N/mm2)

HRB  108  ÷  114

HB 340 ÷ 440 

Bending strength (N/mm2)

> 500

Modulus of elasticity E (N/mm2)

110000  ÷  130000

Microstructure

Graphite

Predominantly flaky and uniformly distributed 

Matrix

Tempered martensite with uniformly distributed special carbides

Phosphide eutectic

Punctiform tending to non-continuous network

Alloyed, heat treated carbidic
cast iron

ISO 6621-3, Class 30 - Subclass MC32

Caber Ref. ISO 6621-3: 1990 DIN 34109 (ex 70909) GOETZE
Gh. F Class 30 subclass MC32 Carbidic cast iron K11 – F14 – GOE 32

Gh. F Chemical composition (%)
C Si Mn P S Cr Mo V Cu Ni Ti W Nb Fe
Min 2,5 3,6 0,8 - - 0,2 0,5 0,3 0,5 0,5 - 0,8 0,1 Rest
Max 3,3 4,6 1,2 0,35 0,15 0,6 1,0 0,7 1,0 1,0 0,3 1,2 0,4

Mechanical properties

Hardness (N/mm2)

HRB  109  ÷  116

HRC 35 ÷ 49

Bending strength (N/mm2)

≥ 650

Modulus of elasticity E (N/mm2)

130000  ÷  160000

Microstructure

Graphite

Fine flaked and punctiform

Matrix

Tempered martensite with uniformly distributed special carbides

Phosphide eutectic

Punctiform tending to non-continuous network

Spheroidal graphite cast iron

ISO 6621-3, Class 50 - Subclass MC52

Caber Ref. ISO 6621-3: 1990 DIN 34109 (ex 70909) GOETZE
Gh. SF Class 50 subclass MC52 G6 (spheroidal graphite cast iron) K9 – KV1 – GOE 52

Gh. SF Chemical composition (%)
C Si Mn P S Cr Mo V Cu Mg Fe
Min 3,5 2,4 - - - - - - - - Rest
Max 4,0 3,2 0,5 0,3 0,05 0,2 - - 1,0 0,1

 

Mechanical properties

Hardness (N/mm2)

HRB  104  ÷  112

HRC 25 ÷ 42 

Bending strength (N/mm2)

> 1300

Modulus of elasticity E (N/mm2)

> 150000  

Density (g/cm3)

7.3

Microstructure

Graphite

Roughly spheroidal

Matrix

Tempered martensite, isolated carbide particles are acceptable

Coefficient of thermal expansion 10-6/K

20 - 100°C: 10.0

Caber Rings 

Specialized in the production of piston rings  for internal combustion engines and a wide range of applications with Machine Engineering and Foundry.

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