The serial products are made of high quality low carbon alloy steel. The forging quality is strictly controlled by use of the heating patent technology developed independently .The integralmechanical performance is guaranteed through the integral quenching and tempering treatment with the domestically advanced heat treatment technical equipment. The tolerance quality and strength are also well controlled with the rod head digital controlled process. The integral performance of sucker rod is at last guaranteed by means of techniques above.The grade D sucker rods produced by our company have well tenacity, high tensile strength and excellent performance that can stand the larger asymmetry cyclic loading and resist the slight corrosion. So the grade Dsucker rods are applied abroad in oil production field.

Specification (in)	Length (m)	Mechanical performance
		Tensile strength σb MPa	Yield point σs MPa	Tensile stretch 200mm δ %	Reduction of area ψ %	Erichstm impact flexibility value AKV J	Fatigue strength
							σ0.1 MPa	Cycle index
CYG5/8	7.62, 8.0, 8.5, 9.14 and 1-3m Different long pony rods	793～965	≥620	≥10	≥50	≥60.8	406	≥1×106