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Torich International Co.,Ltd.
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Torich International Co.,Ltd. [China (Mainland)]
Business Type:Manufacturer, Trading Company
City: Ningbo
Province/State: Zhejiang
Country/Region: China (Mainland)
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blog
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 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. |
| BWK | 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 Zeleziarne Podbrezova according to ASTM A519
| CW | Cold drawn |
| A | Annealed |
| N | Normalized |
| SR | Annealed to relieve stresses |
| NT | Normalization and tempering |
| QT | Quenched and tempered |
