Valves are important part of piping systems. They have to be handled very delicately. Material has its own role while finalizing the piping design. Various codes and standards have to be referred. While referring to the ASTM standards, many clauses have to be referred.

1.Division of Materials in four categories

2.Based on forging and casting, the selection of 8 ASTM standards and 20 associated grades

3.Discussion on selected grades & ASTM in details :

• •Carbon steel

• •High temperature steel

• •Low temperature Steel

• •Stainless steel