Base Material as SG Iron 500/7 manufactured at Gopal naicker & sons

Austempering Heat Treatment process:

Austenitising Temperature (K)

Austenitising time(min)

Austempering Temperature(K)

Austempering Time(min)

1173 90

523

306090

120

573

306090

120

623

306090

120

From the above heat treatment I require the following hardness

Required Material Hardness:

1) Grade 3 (HRC 36.5-44.6), 2) Grade 4 (HRC 39.7-47.7), and

3) Grade 5 (HRC 40.8-49.8)