Mechanical Properties of High-Nb X80 Steel Weld Pipes for the Second West-to-East Gas Transmission Pipeline Project

Table 1

The correlation of mechanical properties of pipe bodies with Ceq and Pcm.

	Method	Relationship	Correlation
⁢Tensile strength (TS)		TS = 501(±22) + 464(±51)Ceq	0.88
		TS = 509(±15) + 1098(±88)Pcm	0.97
Yield strength (YS)		YS = 562(±20) + 154(±45)Ceq	0.57
		YS = 555(±19) + 425(±107)Pcm	0.79
Impact energy (IE)		IE = 951(±58) − 1404(±132)Ceq	0.91
		IE = 819(±67) − 2776(±372)Pcm	0.91