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ML00047 - Mar.2017

Ductile Cast Iron Caps of Electrical Insulators

Detail of CAP A microstructure. Graphite in imperfect nodules and ferritic matrix. Grey sulphide inclusions.

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Detail of CAP A . Graphite in imperfect nodules and matrix. Grey sulphide inclusions.
M

Material

Ductile Cast Iron
  • ASTM A 536 60-40-18
Ds

Description

Three different caps of electrical insulators, manufactured by different suppliers to meet A536 grade 60-40-18, are presented and the results of chemistry, microstructural analysis and hardness may be compared.

C

Chemistry (% in weight)

Cap A Product Analysis

2.35C; 1.65Si; 0.51Mn; 0.042P; 0.011S.

Cap B Product Analysis

2.72C; 2.63Si; 0.16Mn; 0.023P; 0.011S.

Cap C Product Analysis

2.66C; 2.71Si; 0.22Mn; 0.034P; 0.008S.

Associated Images
Micrography of CAP A, showing graphite in imperfect nodules and ferritic matrix.
481
VIEW
ML00047 / Mar.2017
Ductile Cast Iron Caps of Electrical Insulators
M - Ductile Cast IronP - Cast iron capAp - EnergyCd - Typical manufacturing
Cm - Nital Etched Micrography by OMDf - Graphite in Imperfect Nodules
Detail of CAP A microstructure. Graphite in imperfect nodules and ferritic matrix. Grey sulphide inclusions.
88
VIEW
ML00047 / Mar.2017
Ductile Cast Iron Caps of Electrical Insulators
M - Ductile Cast IronP - Cast iron capAp - EnergyCd - Typical manufacturing
Cm - Nital Etched Micrography by OMDf - Predominantly Ferritic
Micrography of CAP B, showing graphite in nodules and ferritic matrix.
67
VIEW
ML00047 / Mar.2017
Ductile Cast Iron Caps of Electrical Insulators
M - Ductile Cast IronP - Cast iron capAp - EnergyCd - Typical manufacturing
Cm - Nital Etched Micrography by OMDf - Graphite in Nodules
Detail of CAP B microstructure. Graphite in nodules and ferritic matrix. Small sulphide inclusions (grey).
60
VIEW
ML00047 / Mar.2017
Ductile Cast Iron Caps of Electrical Insulators
M - Ductile Cast IronP - Cast iron capAp - EnergyCd - Typical manufacturing
Cm - Nital Etched Micrography by OMDf - Predominantly Ferritic
Micrography of CAP C, showing graphite in nodules and ferritic-perlitic matrix.
52
VIEW
ML00047 / Mar.2017
Ductile Cast Iron Caps of Electrical Insulators
M - Ductile Cast IronP - Cast iron capAp - EnergyCd - Typical manufacturing
Cm - Nital Etched Micrography by OMDf - Graphite in Nodules
Detail of CAP C microstructure. Graphite in nodules and ferritic-perlitic matrix.
56
VIEW
ML00047 / Mar.2017
Ductile Cast Iron Caps of Electrical Insulators
M - Ductile Cast IronP - Cast iron capAp - EnergyCd - Typical manufacturing
Cm - Nital Etched Micrography by OMDf - Predominantly Ferritic