Here, we continue to study on the solution treatment conducted at different temperatures for Inconel 600 specimens. Solution treatment not only has effect on microstructure of Inconel 600 specimens (elaborated in last article) but also has effect on the hardness and corrosion resistance of the material.

Specimen	Solution Treatment Temp.	Corrosion Rate	Hardness
No.	°C	mm/y	HV10
1	950	0.43	177
2	1000	0.54	180
3	1050	0.63	182
4	1100	0.49	167
5	1150	0.76	139
6	1200	0.36	126

*The 6 pieces of Inconel 600 plate (specimen) are solution treated at 950°C, 1000°C, 1050°C, 1100°C, 1150°C, and 1200°C respectively.
*The hardness value is expressed in Vickers hardness.
*The corrosion rate is tested in accordance with ASTM G28 Method A: Ferric Sulfate- Sulfuric Acid Test.

(1) If Inconel 600 is solution treated at a temperature under 1050°C, the hardness will keep stable and almost the same. When it is higher than 1050°C, the hardness will get lower as the temperature goes higher. (2) After solution treatment, Inconel 600 has exceptional resistance to intergranular corrosion. Especially, if the solution treatment is carried out at 1100°C, carbides may completely dissolve in austenitic matrix. In conclusion, the recommended solution-treatment temperature for Inconel 600 is 1050~1100°C.