Physicochemical and Vibration Analysis of Christmas Tree Four-Way Flange Failure under Fracturing Process

Table 2

Chemical composition of the four-way flange and connecting valve.

Element	C	Si	Mn	Cr	Mo	P	S	Ni	V
Four-way flange measurement results	0.29	0.27	0.56	1.01	0.18	0.015	0.008	0.03	<0.01
Failure valve measurement results	0.31	0.25	0.56	0.92	0.16	0.007	0.003	0.20	0.01
Standard requirement	0.26–0.33	0.17–0.37	0.40–0.70	0.80–1.10	0.15–0.25	≤0.025	≤0.025	≤0.30	≤0.30