Types of SS pipe fittings
Refer mechanical and chemical properties of stainless steel welded fittings, SS pipe fittings and End cap
Stainless steel fittings WP grades
| 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 |
|---|---|
| CR | Corrosion resistant grade. S through WU Classes do not apply. |
| WP-S | Seamless |
| WP-WX | RT all welds with or without filler metal. |
| WP-WU | UT all welds with or without filler metal. |
| WPgrade-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. |
ASTM A403 fittings trade name
| Trade Name | Grade | UNS # | Buttweld Fitings |
|---|---|---|---|
| 304 | WP304 | S30400 | A403* / SA403* |
| 304L | WP304L | S30403 | |
| 304H | WP304H | S30409 | |
| 316 | WP316 | S31600 | |
| 316L | WP316L | S31603 | |
| 316H | WP316H | S31609 | |
| 321 | WP321 | S32100 | |
| 321H | WP321H | S32109 | |
| 347 | WP347 | S34700 | |
| 347H | WP347H | S34709 | |
| 317L | WP317L | S31703 |
