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AISI 4140
ConditionsHardness
T (°C)TreatmentMethodValue
25 annealed at 815°C   HB 197 
25 normalized at 870°C   HB 302 
25 oil quenched, fine grained, tempered at 205°C   HB 510 
25 oil quenched, fine grained, tempered at 315°C   HB 445 
25 oil quenched, fine grained, tempered at 425°C   HB 370 
25 oil quenched, fine grained, tempered at 540°C   HB 285 
25 oil quenched, fine grained, tempered at 650°C   HB 230 
Glossary