Integral heavy weight drill pipe is made from AISI4145H alloy steel.acc.to API Spec.7 and SY/T5144. It is formed by hot forged and fully heat-treated.HWDP’s wear resistance hardbanding is standard on two joint connections and central upset, the types of hardbanding include Arnco 100XT and 300XT.All threads are phosphate, copperized or cold worked. All connections are equipped with pressed steel thread protectors.All threads are machined with CNC Lathes-double-shouldered and special threads.

Mechanical property:

Yield strength: ≥758

Tensile stength: ≥964

Elongation:  ≥13

Hardness(brinell): 285-341

Impact value (charpy-v): ≥54

Tolerances:

Outer diameter: ±0.8

Internal diameter: ±1.60

Chanfer: ±0.4

Inner and outer thread connection: ±0.8