Drill rods (precision tubes)

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Description

Our DRILMAX® precision steel tubes, designed for explorational drilling (e.g., wireline operations), are characterized by a unique combination of excellent straightness, low residual stresses, and balanced mechanical properties. Due to their low residual stress, DRILMAX® pipes are highly elastic and offer a high mechanical strength. They undergo only minimal plastic deformation during the drilling process. DRILMAX® pipes are available in various strength grades with yield strengths ranging from 550 MPa to 950 MPa and in a wide variety of dimensions.

Your benefits

  • Deviation from perfect straightness of no more than 1 mm over 6 m
  • Extremely low residual stresses significantly reduce the risk of string loss
  • Excellent wear resistance for maximum reliability and safety in harsh operating environments
  • Also ideal for directional drilling (e.g. HDD)

Dimensions

Outside diameter
from to
25.4 mm 168 mm
1.000 inch 6.614 inch
Wall thickness
from to
1.5 mm 10 mm
0.059 inch 0.394 inch
Other dimensions available upon request

Further information

Lengths

The standard length of DRILMAX® tubes is 3 m (9.843 ft). Other lengths ranging from 1.5 m to 6 m (4.921 ft to 19.685 ft) are available upon request.

Picture of the production os tubes for drill rodsstängerohren bei Mannesmann
Tolerances
Straightness tolerances

Standard straightness is 1 mm per 2 m.

Optimal straightnesses of 1 mm per 6 m can be supplied on request.

Tolerances on diameter
Outer­ Diameter Tole­rances
25.4 mm < OD ≤ 40 mm
1 < OD ≤ 1.575“ 		+0.13 mm / -0 mm
+0.0051'' / -0
40 mm < OD ≤ 80 mm
1.575“ < OD ≤ 3.150“ 		+0.25 mm / -0 mm
+0.010'' / -0
80 mm < OD ≤ 140 mm
3.150“ < OD ≤ 5.512“ 		+0.38 mm / -0 mm
+0.015'' / -0
140 mm < OD ≤ 168 mm
5.512“ < OD ≤ 7.008“ 		+0.45 mm / -0 mm
+0.018'' / -0
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Inner­ Diameter Tole­rances
ID ≤ 75 mm
ID ≤ 2.953 		+0 mm / -0.25 mm
+0'' / -0,010
75 mm < ID ≤ 140 mm
2.953“ < ID ≤ 5.512“ 		+0 mm/ -0.38 mm
+0'' / -0.015
ID > 140 mm
ID > 5.512 		+0 mm / -0.45 mm
+0'' / -0.018
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Steel grades and properties

Drilmax® steel tubes are supplied in various steel grades with different mechanical properties. Other than the below listen steel grades can be supplied on request.

Due to their particularly high strength and hardness, Drilmax® 850 and Drilmax® 950 materials do not require a quench-and-temper treatment.

Chemical composition (% max.)
C Si Mn P S Cr Mo
Drilmax®­ 550 0.200 0.500 1.600 0.025 0.025
Drilmax®­ 650 0.330 0.350 0.600 0.035 0.035 1.100 0.250
Drilmax®­ 730 0.440 0.300 1.650 0.035 0.035
Drilmax®­ 850 0.420 0.450 1.700 0.035 0.035 0.200 0.020
Drilmax®­ 950 0.350 0.700 2.500 0.025 0.005 1.000 0.300
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Mechanical properties
Yield Strength Tensile Strength Elon­gation Delivery Condition
Rp0.2 (MPa) minRm (MPa) minA2" min (%)
Drilmax®­ 550 550 690 18 +SR
Drilmax®­ 650 650 790 15 +SR
Drilmax®­ 730 730 820 15 +SR
Drilmax®­ 850* 850 950 15 +SR
Drilmax®­ 950* 950 1000 12 +N +SR
*Drilmax® 850 and Drilmax® 950 materials do not require a quench-and-temper treatment.
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Drilmax® tubes only reveal very low residual stresses (measured in transverse direction) of maximum 100 MPa for B, N und H dimensions. Ultra low residual stresses could be proposed upon request.

Quench-and-temper treatment (+QT)

A heat treatment process ("quenching and tempering") achieves higher mechanical properties and thus improves the wear resistance of the product.

Quenching and tempering is a combined heat treatment to optimize the mechanical properties of materials. This allows the highest strengths and hardnesses to be set with consistently good machining and forming properties.

Picture of a QT treatment
Taylor Drawn Tubes (TDT)

Drilmax® tubes can also be supplied with variable wall thicknesses (TDT - Taylor Drawn Tubes). These allow a weight reduction of up to 30% compared to standard tubes.

[Translate to Englisch:] Scetch of a taylored drawn tube (TDT)
Tests
[Translate to Englisch:] Bild von Bohrgestängen im Einsatz

In order to prove compliance with the high requirements for drill rods, we subject Drilmax® tubes to extensive tests, for example:

  • Chemical analyses
  • Dedicated straightness checking
  • Mechanical testing
  • 100% Eddy current testing e.g ASTM E309, EN ISO 10893-1

Specific testing upon request, for example:

  • Continuous OD checking
  • Residual stress measurement
  • 100% Ultrasonic testing e.g. ASTM E309, EN ISO 10893-10
  • Microstructural inspection
  • Further tests possible after consultation
Learn more about tests
Packaging

Drilmax® tubes are packed and protected for shipment all over the world according to customer requirements.

The tubes are typically oiled inside and outside for temporary corrosion protection and delivered in bundles.

Tube processing

We have acquired our expertise over many years and offer a wide range of possible further processing steps for steel tubes. We actively support you with your plans - from sawing and machining of the tube blank to complex bending and upsetting operations.

We can also reduce eccentricity and improve concentricity by turning and grinding, create complex geometries with processes such as rotary swaging and axial forming, and modify properties with the aid of partial heat treatment.

Learn more about tube processing options
[Translate to Englisch:] Bild eines innen geschälten Rohres
[Translate to Englisch:] Bild von aufgeweiteten/reduzierten Rohren
[Translate to Englisch:] Bild eines gestanzten Rohres
Engineering

Do you have any questions regarding the further processing of tubes to tubular components for engineering purposes? Our experts will be happy to support you. If required, we accompany the entire process - from the idea to the development and production of pre-series parts and prototypes to the product ready for series production.

Depending on the intended application, we advise you on the selection of the right tube production route, suitable heat treatment, and the necessary processing steps - which includes useful surface protection strategies. For this purpose, we have a wide range of options for computation and simulation as well as testing and measuring processes available.

 

Mannesmann Precision Tubes
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