Dear all, I need some help...I come across the specification for austenitic stainless steel SA403 WP316/316LW for the fitting (Elbow) I am just wondering what is 316/316LW referring to ? Is it dual certificate 316 and 316L with W stand for welded? Any info will be highly appreciated....
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Austenitic stainless steel SA403 WP316/316LW
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Are you sure that you have SA408 SS piping elbows and not SA 403 ? ... Please check for more typos !!!!
"Several grades of austenitic stainless steel alloys are included in this specification (SA403). Grades are designated with a prefix, based on the applicable ASTM/ASME or MSS standards. For each of the WP stainless grades, several classes of fittings are specified, to indicate whether seamless or welded construction was utilized. Class designations are also utilized to indicate the nondestructive test method and extent of nondestructive examination. A general summary of the fitting classes applicable to all WP grades of stainless steel follows. There are no classes for the CR grades.
Fitting Classes for WP Grades
CR Corrosion resistant grade. S through WU Classes do not apply.
WP-S Seamless
WP-W Welded, RT or UT all pipe starting material welds made with filler metal. All fitting manufacturer welds except as excluded in A/SA403 paragraph 5.4.3.
If UT is substituted for RT, all welds must be examined 100% for their length as required by A/SA403 paragraph 5.6
WP-WX RT all welds with or without filler metal.
WP-WU UT all welds with or without filler metal.
WP grade-grade-class Insert grades (304-304L) and class (S,W,WX, or WU). Applies to fittings meeting all chemical and physical requirements of both grades."
MJCronin
Sr. Process Engineer
"Several grades of austenitic stainless steel alloys are included in this specification (SA403). Grades are designated with a prefix, based on the applicable ASTM/ASME or MSS standards. For each of the WP stainless grades, several classes of fittings are specified, to indicate whether seamless or welded construction was utilized. Class designations are also utilized to indicate the nondestructive test method and extent of nondestructive examination. A general summary of the fitting classes applicable to all WP grades of stainless steel follows. There are no classes for the CR grades.
Fitting Classes for WP Grades
CR Corrosion resistant grade. S through WU Classes do not apply.
WP-S Seamless
WP-W Welded, RT or UT all pipe starting material welds made with filler metal. All fitting manufacturer welds except as excluded in A/SA403 paragraph 5.4.3.
If UT is substituted for RT, all welds must be examined 100% for their length as required by A/SA403 paragraph 5.6
WP-WX RT all welds with or without filler metal.
WP-WU UT all welds with or without filler metal.
WP grade-grade-class Insert grades (304-304L) and class (S,W,WX, or WU). Applies to fittings meeting all chemical and physical requirements of both grades."
MJCronin
Sr. Process Engineer
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