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Assigneevoestalpine Tubulars GmbH & Co KG
InventorsMarkus SCHAFFER, Peter WINKLER, REINHARD LEITNER, Thomas SCHALKHAMMER
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A screw joint has a tubular element with a female thread and a tubular element with a male thread, wherein the male thread and the female thread have first contact surfaces that cooperate with each other, and the tubular elements optionally have second contact surfaces adjacent to the female thread and/or the male thread, wherein the first contact surfaces and the optional second contact surfaces each have a coating including a first and a second layer, wherein the first layer is formed as a conversion layer in each case, one of the first contact surfaces that cooperate with each other has a second layer made of ceramic material with a friction reducing effect and the other of the two contact surfaces that cooperate with each other has, as a second layer, a varnish layer with a binding agent made of an organic polymer throughout which solid lubricant particles are distributed.
A screw joint comprising a tubular element having a female thread and a tubular element having a male thread, wherein said male thread and said female thread have first contact surfaces that cooperate with each other, and the tubular elements optionally having a second contact surfaces adjacent to said female thread and/or said male thread, wherein said first contact surfaces and, if applicable, said second contact surfaces each having a coating which has at least a first and a second layer, wherein said first layer is formed as a conversion layer in each case, wherein one of said first and, if applicable, second contact surfaces that cooperate with each other has a layer comprised of ceramic material with a friction reducing effect as a second layer and the other of the two contact surfaces that cooperate with each other has a varnish layer with a binding agent comprised of an organic polymer, throughout which solid lubricant particles are distributed, as a second layer.
A method for surface treatment of threads of a threaded connection of tubular elements comprising
Dependencies are inferred from the claim text.