Can Material S66286 Be Used According to Table A.26 of NACE MR0175/ISO 15156-3:2015?

Introduction

In this article, we will discuss whether Material S66286 can be used according to Table A.26 of NACE MR0175/ISO 15156-3:2015. We will also compare the heat treatment requirements of Grade 660 UNS S66286 and Grade 662 UNS S66220, as defined by ASTM A638 and ASTM A453.

Material S66286

Table A.26 of NACE MR0175/ISO 15156-3:2015 has no restrictions on product form, and it requires UNS S66286 to be in the solution annealed and aged or solution annealed and double-aged condition with a maximum hardness of 35 HRC. Therefore, Material S66286 can be used according to Table A.26 of NACE MR0175/ISO 15156-3:2015.

Grade 660 UNS S66286 and Grade 662 UNS S66220

Grade 660 UNS S66286 and Grade 662 UNS S66220 are defined by ASTM A638 and ASTM A453, but their heat treatments differ.

Grade 660 UNS S66286

ASTM A638 Grade 660 type 1 and 2 Heat treatment: solution-annealed and aged, see ASTM A638 Table 3
ASTM A453 Grade A and B Heat treatment: solution-annealed and aged, see ASTM A453Table 4
ASTM A453 Grade C and D Heat treatment: solution-annealed and double aged condition, see ASTM A453Table 4

Grade 662 UNS S66220

ASTM A638 Grade 662 Heat treatment: solution-annealed and double aged condition, see ASTM A638 Table 3
ASTM A453 Grade 662 A and B Heat treatment: solution-annealed and aged, see ASTM A453Table 4

Conclusion

In conclusion, Material S66286 can be used according to Table A.26 of NACE MR0175/ISO 15156-3:2015. However, Table A.26 does not apply to UNS S66220 (Grade 662), which is defined in ASTM A638 and ASTM A453 but has different heat treatment requirements.