ThyssenKrupp has been in the business of steel making for over 100 years and today is the largest manufacturer of stainless steels in the world.

EWK steel mill in Witten, Germany, (ThyssenKrupp group) produces the finest grades of non-magnetic austenitic stainless steels for the oil industry.

Stainless Steel Drill Collars require specific non-magnetic properties, physical properties, resistance to stress corrosion, pitting and galling. These requirements are taken into consideration when we select the chemical composition and heat treatment process of our steels.

the resultant stainless steel drilling tools form tough and reliable components of the drill string.

The correct forging is a key aspect in the manufacturing process of high quality stainless steel drilling tools.

There is a requirement for tight control on time/temperature cycles and a need for adequate forging capacity to warm work these steels. This requirement is accomplished with purpose built hammer forging systems where the bars are turned and advanced by computer controlled manipulators.

EWK steel mill uses the worlds most powerful radial hammer forging machine to achieve optimum result in uniform material strength, ductility, optimal grain flow in a fully austenitic stainless steel.

Our non-magnetic steel meet and surpass the minimum requirements of API Spec. 7 and Shell SQAIR (now NS-1).

Dimensional tolerances follow API specification 7.

The bore eccentricity follows NS-1 specifications.

The mechanical properties are measured according to the requirements of ASTM A 370. The relative magnetic permeability is guaranteed to be less than 1.010.

Field gradient measurements are taken on each bored non-magnetic bar and guaranteed to deviate no more than ±0.05 µtesla from a uniform magnetic field.

Resistance to intergranular stress corrosion is measured by the ASTM A 262 practice E test. subjecting the exposed surfaces to compressive treatments reduces transgranular stress corrosion tendencies.