Failure Analysis on 42CrMo Steel Bolt Fracture

Table 1

Results of mechanical property test.

Test result	RP0.2 (MPa)	Rm (MPa)	A (%)	Z (%)	Impact test result KV2 (J)	HRC
GB/T3077 (standard value)	≥930	≥1080	≥12	≥45	≥63	32–38
Test value	1055	1127	16.5	56	−20°C: 63.7 70.4 71.3	36.0