Abrasion-Resistant White Casting Iron-Resistant White Cast Iron 2–ASTM A532_A532M

• Abrasion-Resistant White Cast Iron 2

• 1.1 Chromium white cast iron—one of abrasion-resistant white cast iron

There are currently two valuable chromium based Abrasion-Resistant White Cast Iron-resistant white cast iron. One is Ni Hard, another is high chromium white cast iron.

1. A. Ni- Hard cast iron (nickel hard cast iron)

   

INCO created Ni – Hard (4.5%Ni, 1.6% ~ 2.0%Cr) martensitic white cast iron in 1932. The United States used it as a liner and an impurity pump overflow parts. Furthermore Japan and Europe countries have the application successively. However, due to the eutectic cementite in the white iron distributes along the A grain boundaries. As a result it seriously affects the mechanical properties of the cast iron (σ_b20 ~ 25kg/mm²).

In 1963 INCO created an improved Ni – Hard 4 , the content of Cr increased to 9%.  And the content of Si is 1.7%, Ni is 6%. The crystal of eutectic carbide changed from the original M₃C to M₇C₃ type [(CrFe) ₇C₃]. Consequently which greatly improved the mechanical properties (σ_b 50kg/mm²).  Also HV reaches 600~800. It is just less than Cr15- Mo3 high chromium white cast iron. Hence in the production of grinding ring, roller, lining plate of ball mill  liner and other castings they have wide application.