SS316L Butt Weld Fitting, A403 WP316L Equal Tee (seamless /
Welded), B16.9 Standard
ASTM A403 Abstract
ASTM A403 covers the standard for wrought austenitic stainless
steel fittings for pressure piping applications. The material for
fittings shall consist of forgings, bars, plates, or seamless or
welded tubular products. Forging or shaping operations shall be
performed by hammering, pressing, piercing, extruding, upsetting,
rolling, bending, fusion welding, machining, or by a combination of
two or more of these operations. All fittings shall undergo
heat-treatment. Chemical and product analyses shall be performed
and shall conform to the required chemical composition in carbon,
manganese, phosphorus, sulfur, silicon, chromium, molybdenum, and
titanium. Tension test shall be done on the fitting material to
determine the tensile properties such as yield strength and tensile
strength. Fittings supplied under this specification shall be
examined visually for surface discontinuities, surface checks, and
mechanical marks.
ASTM A403 WP316L covers the standard for wrought austenitic stainless steel
fittings for pressure piping applications. The material for
fittings shall consist of forgings, bars, plates, or seamless or
welded tubular products. Forging or shaping operations shall be
performed by hammering, pressing, piercing, extruding, upsetting,
rolling, bending, fusion welding, machining, or by a combination of
two or more of these operations. All fittings shall undergo
heat-treatment.
A403 WP316L equal tee is a pipe fitting made from 316L stainless steel and designed
according to the standards set by ASTM A403, which is the
specification for wrought austenitic stainless steel pipe fittings.
The "WP" in the material specification refers to welded and
pressure-rated pipe fittings, while "316L" is a low-carbon variant
of 316 stainless steel, ideal for high-corrosion environments.
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. |
A403 WP316L Fitting Chemical Composition
| C | Mn | Si | P | S | Ni | Cr | Mo |
|---|
| 0.035 | 2 | 1 | 0.04 | 0.03 | 10-16 | 18-20 | 2-3 |
A403 WP316L Fitting Mechanical Properties
| Tensile Strength | Yield Strength | Elongation |
|---|
| 515 (Mpa) | 205 (Mpa) | 35 (%) |
A403 WP316L Fittings Application
Chemical and petrochemical industries (for pipelines carrying corrosive fluids)
Marine environments (offshore and coastal pipelines)
Food and beverage processing
Pharmaceutical processing
Water treatment plants
Power generation (especially in nuclear or thermal plants)
Oil and gas production (offshore, subsea, and refineries)
