Steel is produced in electric arc furnace and is fully killed.
BK (+C) Cold finished/hard (cold finished as drawn). No heat treatment after the last cold forming process
BKS (+SR) Cold finished/stress relieve annealed. After the final cold forming process the tubes are stress relieve annealed.
GBK (+A) Annealed. After the final cold forming process the tubes are annealed in a controlled atmosphere.
NBK (+N) Normalized. After the final cold forming process the tubes are annealed above the upper transformation point in a controlled atmosphere
2.5 Surface condition
Tube surface corresponds to the standards and depends on the method of tube manufacturing and method of heat treatment. Value of roughness Ra <0.8 µm.
2.6 Tube ends
The tubes are delivered with plain ends without burrs at the ends of the tube.
Upon request ends could be plugged with plastic caps
3.Testing ofOD6mm ID4mm EN10305 E235 Steel Pipe for Precision Applications
Testing is performed in accordance with corresponding standards or by agreement
• flattening test , drift expanding test, flaring test, bending test
• mechanical properties test
• NDT for detection of transverse imperfections and wall imperfections
4. Packing and Protective coating
4.1 Tubes are supplied either uncoated or with the manufacturers standard mill coating at the option of the customer (subject of agreement between customer and manufacturer).
OD6mm ID4mm EN10305 E235
Steel Pipe for Precision Applications
