Benteler Steel/tube Gmbh

Waldemar Engel

Jozef Balun

Michael Kaufmann

Nathalie Weiß-Borkowski

Niko Große-Heilmann

The present invention relates to a tube product, namely a perforating gun hollow carrier, consisting of a steel alloy with martensitic matrix, characterized in that it has a yield strength Rp0, 2 of at least 900 MPa, and that the steel alloy besides iron and impurities caused by melting has the following alloying elements: C 0.15-0.6%; Si 1.4-2.6%; Cr 2.0-4.0%; Mn 0.15-2.0%; Mo 0.2-0.6%; N<0.015%; and at least one of the alloying elements Nb, V and Ti in sum of ≥0.01% and the tube product has been subjected to a quenching and partitioning heat treatment. Furthermore, the invention relates to a method of manufacturing such a tube product.

Tube product, hollow carrier of perforating gun and method of manufacturing the tube product

An outer tube for a perforating gun is provided that includes an inner wall and an outer wall and also a wall thickness (D) and a length (L), wherein the outer tube has a hardness over its entire longitudinal extent along the length (L) and its transverse extent along the wall thickness (D), wherein the hardness of the outer tube is reduced, in at least one region, to an extent (T) measured from the outer wall to the inner wall, wherein, in this region, the outer tube has a reduced hardness (HV) on its outer wall, said reduced hardness being reduced in this region by at least 5% in relation to the hardness (H) of the inner wall.

Growing community of inventors

Paderborn, Germany

Waldemar Engel