Seamless drilling steel pipe

Seamless drilling steel pipe is a high-strength steel pipe used in geological exploration, oil and gas drilling, mining and other fields. Due to its seamless structure, it has higher strength, better pressure resistance and corrosion resistance, and is suitable for deep well drilling and harsh geological environments.

Main features

(1) Seamless structure

It is produced by hot rolling or cold drawing process, without welds, and has higher overall strength.

It avoids welding defects (such as pores, cracks, etc.) and improves the reliability of the pipe.

(2) High strength & wear resistance

It is made of high-quality alloy steel (such as 4140, 4130, AISI 4340, etc.) with high tensile strength and torsional strength.

The surface can be quenched + tempered (QT heat treatment) to improve hardness and wear resistance.

(3) Corrosion resistance

It can be galvanized, phosphated, plastic coated and other anti-corrosion treatments to extend its service life.

It is suitable for acidic environment (H₂S, CO₂) and seawater corrosion environment.

(4) Precision size

Outer diameter (OD): usually 60mm-200mm (customizable upon request)

Wall thickness (WT): 6mm-20mm, suitable for different drilling requirements

 Length: 6m-12m (standard length), longer lengths can be customized

Main uses

Application areas Specific uses

Oil & gas drilling Drill pipe, casing, tubing, drill collars

Geological exploration Core drilling, hydrological drilling, mineral exploration

Mining Blast holes, ventilation wells, drainage wells

Engineering survey Pile foundation construction, tunnel exploration

Scientific drilling Deep sea drilling, polar drilling

Production process

Hot-rolled seamless pipe (applicable to large diameter, thick wall pipe)

Round billet→heating→perforation→rolling→sizing→cooling→straightening→testing→finished product

Cold drawn seamless pipe (applicable to high precision, small diameter pipe)

Hot rolled billet→pickling→cold drawing→heat treatment→Straightening→Inspection→Finished product

Heat treatment process

Quenching + tempering (QT): Improve strength and toughness

Normalizing (N): Improve microstructure uniformity

Quenching and tempering: Optimize mechanical properties