Variation of hardness in standard (p15) and high phosphorus (p30) cast iron brake blocks (TM-MS-065)

1. INTRODUCTION A draft specification for cast iron brake blocks has been drawn up by the Materials and Inspection Division, Chief Mechanical & Electrical Engineers H.Q. This draft specification, No.142, conta'ns a section on the hardness of cast iron brake blocks, which states: "The surface hardness of the...