The definition of the status and nomenclature of heat treatment of steel tubes
Condition and marking of the heat treatment of tubes according to EN 10052 and EN 10305-1
| +C | Cold drawn / hard. After the last cold forming with no heat treatment. | |
| +LC | Cold drawn / soft. After the last heat treatment there is a subsequent slight finishing pass (cold drawing). | |
| +SR | Cold drawn and annealed to remove stresses. After the final cold drawing tubes are annealed in a protective atmosphere to remove the tension. | |
| +A | After the final cold drawing tubes are annealed (soft) in a protective atmosphere. | |
| +N | Normalized. After the final cold drawing tubes are normalized in a protective atmosphere. |
Condition and marking of heat treatment of tubes according to DIN 2391-2
| BK | Cold drawn / hard. After the last cold forming no heat treatment. | |
| BKW | Cold drawn / soft. After the last heat treatment there is a subsequent slight finishing pass (cold drawing). | |
| BKS | Cold drawn and annealed to remove stresses. After the final cold drawing tubes are annealed in a protective atmosphere to remove the tension. | |
| GBK | After the final cold drawing tubes are annealed (soft) in a protective atmosphere. | |
| NBK | Normalized. After the final cold drawing tubes are normalized in a protective atmosphere. |
Marking of the material condition depending on the heat treatment according to CSN and STN 42 0002 and 42004 (the first digit after a number of steel)
| 0 | No heat treatment | |
| 1 | Normalized (annealed) | |
| 2 | Annealed (indicate the type) | |
| 3 | Soft annealed | |
| 4 | Quenched and low tempered | |
| 5 | Normalized (annealed) and tempered | |
| 6 | Heat treated to achieve a minimum tensile within a specified range | |
| 7 | Heat treated to achieve an average tensile within a specified range | |
| 8 | Heat treated to achieve a maximum tensile within a specified range | |
| 9 | Specific (upon agreement) |
Production marking and steel condition of Železiarne Podbrezová according to ASTM A519
| CW | Cold drawn | |
| A | Annealed | |
| N | Normalized | |
| SR | Annealed to relieve stresses | |
| NT | Normalization and tempering | |
| QT | Quenched and tempered |
