Stress Corrosion Status | High Resistance to SCC: Table 1: UTS below 1450 MPa Low Resistance to SCC: Table 3: UTS above 1450 MPa UTS
Remark: acc. to ECSS-Q-ST-70-36C
Data Quality: Design Data |
Machinability | D6AC machines like any of the other low alloy steels. Machining is best done with the alloy in the normalized and tempered condition. Machining, or grinding, of parts that
have been heat treated to 200 ksi, or greater, require a 3 hour stress relief anneal after such machining. |
Welding | D6AC may be welded by TIG method for thin sections or by Gas Metal Arc Welding (GMAW) for heavy sections using a filler rod of the same alloy. Care should be used
to maintain preheat and interpass weld temperature at 232 to 288 C. Restrained weldments should subsequently be post-heated at 315 C, air cooled to 149 C and then,
at once, be stress relieved in a furnace at 538 C followed by re-normalizing and re-tempering. |