Mining Drilling Tube - Zhejiang Dingxin Steel Tube Manufacturing Co., Ltd.

Tubes Built for Harsh Downhole and Surface Conditions

Mining and drilling penetrate rock and mineral at depth, where tube straightness, strength and wear resistance decide reliability. Dingxin specializes in high-quality cold-drawn alloy seamless tubes for drill rods, core barrels, casing and couplings, with the low residual hoop stress and toughness needed in exploration.

Material & Specification

Grade	Standard	Typical OD x WT (mm)	Delivery Condition	Key Properties
30CrMo / 42CrMo	EN 10083-3	40-150 x 5-20	Quenched & tempered	High strength, good toughness
45MnMo	Custom spec	40-130 x 5-18	Quenched & tempered	Wear-resistant drilling grade
SAE 1541	ASTM A519	30-110 x 4-15	Cold drawn	Drill rod and coupling stock
4140	ASTM A519	40-150 x 5-20	Quenched & tempered	Deep-hole, high-strength

Typical Applications & Parts

Drill Rod

The rotating member that transmits torque and feed force in drilling strings.

Core Barrel Inner Tube

Retains the rock core during wireline and conventional coring.

Core Barrel Outer Tube

The wear-facing tube that drills and houses the inner tube.

Casing & Coupling

Maintains borehole stability and connects rod sections under load.

Key Technical Requirements

High straightness for deep, stable holes and reduced rod wear

Low residual hoop stress to resist fatigue in cyclic loading

Excellent wear resistance against abrasive rock and slurry

Toughness and impact resistance for downhole shock loads

Balanced mechanical properties along the full length

Dingxin Manufacturing Capability

Alloy Heat Treatment

In-house quenching & tempering of 30CrMo, 42CrMo, 4140 and similar alloys for strength-toughness balance.

Straightness Control

Cold drawing and straightening hold the straightness needed for long drill strings and core barrels.

Downhole Experience

Tubes supplied for wireline coring, exploration and surface mining equipment.

Full Traceability

Heat-number traceability and mechanical test reports support safety-critical mining use.

Frequently Asked Questions

QWhat tube is used for wireline core barrel?

A wireline core barrel typically uses an outer tube that drills and an inner tube that retains the core. Both are high-strength alloy seamless tubes with tight straightness; we supply them in quenched & tempered grades such as 30CrMo / 42CrMo.

QWhich alloy grade is best for abrasive drilling?

Wear-resistant quenched & tempered alloys (for example 45MnMo or 42CrMo) are common for abrasive and high-load drilling. The final choice depends on rock type, depth and required service life.

QCan you hold tight straightness for long drill rods?

Yes. Our cold drawing and straightening process is set up for the straightness that long drill strings and core barrels require. Specify your tolerance and we will confirm.

QDo you supply couplings and casing tubes?

Yes. We supply casing and coupling stock in the same alloy families, with dimensions and tolerances built to your drawing.

QAre material test reports provided?

Yes. Every order can ship with mechanical test reports and EN 10204 3.1 certificates plus full heat-number traceability.

Quote Your Mining & Drilling Tubes

Tell us the application (drill rod, core barrel, casing), alloy, dimensions and service conditions. We will recommend the right grade and heat treatment.

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