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

Table 2

The correlation of mechanical properties of weld joints with Ceq and Pcm.

	Method	Relationship	correlation
Tensile strength (TS) of; weld joint		TS = 536(±10) + 386(±24)Ceq	0.96
		TS = 568(±9) + 776(±48)Pcm	0.98
Impact energy (IE) of HAZ		IT = 731(±44) − 1094(±101)Ceq	0.91
		IE = 624(±42) − 2099(±237)Pcm	0.94
Impact energy (IE) of; weld metal		IE = 133(±19) + 101(±43)Ceq	0.44
		IE = 112(±15) − 356(±84)Pcm	0.81