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PRODUCT DATA of D6AC
MaterialD6AC
Chemical CompositionFe-1.1Cr-1Mo-0.6Ni-0.46C
PHYSICAL PROPERTIES
Specific Gravity7.78
ELASTIC PROPERTIES
Tensile Modulus210 GPa
THERMAL PROPERTIES
Thermal Expansion Coefficient13.3 μstrain/°C
Melting Range1430 °C
Specific Heat0.486 J/g.K
RELEVANT PROPERTIES FOR USE IN SPACE COMMUNITY
Stress Corrosion StatusHigh 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
MachinabilityD6AC 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.
WeldingD6AC 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.