ASTM A403 is a standard specification for wrought austenitic stainless steel pipe fittings designed for use in pressure piping systems. Stainless Steel WP304 is a specific grade of stainless steel, often referred to as 304 stainless steel, which is one of the most commonly used stainless steel alloys. In this context, "WP304" refers to the grade of stainless steel being used for the elbow.
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