In process found AISI4140 Dia.170 HN.586600 hardness at center of diameter lower spec.
AXO. Request MIN.28 HRC. But actual hardness between 26 – 26.8 HRC.
Customer can’t accept this part, Size Dia.170x460 mm, Q’ty 4 pcs.
Inform to customer change to grade AISI4340
This case issue CPAR to QA for investigate the root cause.