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	PRODUCT DATA of D6AC

Material

D6AC

Chemical Composition

Fe-1.1Cr-1Mo-0.6Ni-0.46C

	PHYSICAL PROPERTIES

Specific Gravity

7.78

	ELASTIC PROPERTIES

Tensile Modulus

210 GPa

	THERMAL PROPERTIES

Thermal Expansion Coefficient

13.3 μstrain/°C

Specific Heat

0.486 J/g.K

Melting Range

1430 °C

	RELEVANT PROPERTIES FOR USE IN SPACE COMMUNITY

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.