Force-fitting clamping connection and method for its production

A flange connection comprising:

• a first flange;
• a second flange;
• one or more clamping sleeves and also clamping elements assigned to the one or more clamping sleeves respectively for fixing the second flange to the first flange;
• wherein each clamping sleeves is clamped with end sides against the first flange in a force-fitting manner and are in engagement with the second flange via a bearing pressure, and;
• wherein a first clamping surface is formed on the end side of each of said one or more clamping sleeves, a second metal clamping surface is formed on the first flange and each first metal clamping surface at each of said clamping sleeves engages with the second metal clamping surface at the first flange, respectively;
• wherein said one or more clamping elements clamp said first metal clamping surfaces at each of said one or more clamping sleeve against said second metal clamping surfaces at the first flange, respectively;
• wherein the first metal clamping surface forms a metal surface structure with microreliefs and microdepressions, said metal surface structure being surface-treated and hardened;
• wherein the second metal clamping surface has a lower hardness than the first metal clamping surface;
• wherein the first metal clamping surface has an average roughness depth RZ in the range from 10 to 100 μm;
• and
• wherein the second metal clamping surface has an average roughness depth RZ in the range from 2.5 to 40 μm.