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Figure 5-1. Standard markings for stainless steel fittings. (Courtesy of Flowline<br />

Corp.)<br />

Markings of Fittings<br />

Figure 5-1 illustrates a stainless steel 90-degree weld<br />

elbow long radius with standard markings:<br />

7071<br />

4" Sch. 40S<br />

Flowline<br />

.237" Wall<br />

WP304L<br />

(heat or batch number)<br />

(size and pipe schedule)<br />

(trademark of the manufacturer)<br />

(wall thickness of S/40S pipe)<br />

(ASTM specification design)<br />

Types of Stainless Steel<br />

There are over forty types of stainless steels. Three<br />

basic types account for half of the stainless steel used.<br />

These are the 300 and 400 series of stainless.<br />

108

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