Add to comply with NACE MR0103 or MR0175 if the box under the material heading is checked to comply with 6.12.1.12.1. Casing wear rings and other parts in compression are not limited by the hardness limitations imposed by NACE MR 0103 or MR0175. Some specs may require more component hardness control than others - compare against API 610 11th edition para 6.12.1.12.5 and add where necessary to comply.