Application: tubing is used to extracting petroleum and natural gas from a well

          Casing serves as walls of a well

GRADE: J55(37Mn5)

       N80(36 Mn2V)

Grade and chemical composition

Grade	P≤	S≤
J55(37Mn5)	0.030	0.030
N80(36Mn2V)	0.030	0.030

Mechanical properties

Steel Grade	Yeild point		Tensile point
	Min	Max
J55	379	552	517
N80	552	758	689