Abstract

In this paper nitriding is performed on (Nitralloy135) alloyed steel which is
coated with chromium before heat treatment. Tests and inspections were
preformed like coated layer depth and hardness .The result show that
nitriding layer depth increases with nitriding time. Max. Layer depth is
(0.45) mm with nitriding time (90) min. , when chromium is added to the
alloy the nitriding depth layer increased with time decrease, and also in
micro structure test shows fine and uniform structure and stable steel
phases.
As for mechanical properties hardness was (1000HV) at (550°C), Also other
mechanical properties (Tensile Stress, Yield Point, Elongation) as shown in
properties table ,So we have a hard tough sample with good properties as
the objective of this paper.