Product Overview
ASME B16.28 ASTM A403 wrought stainless steel buttwelding short radius elbows and returns are precision-engineered fittings designed for directional changes in industrial piping systems. These components meet rigorous standards for pressure applications across various industries.
Technical Specifications
Key Product Details
| Specification |
Details |
| Size Range |
1" to 24" |
| Manufacturing Standards |
ASME B16.28 |
| Fitting Types |
Short Radius 90° Elbow, Short Radius 180° Return |
| Materials |
ASTM A403 |
| Available Finishes |
Galvanized, Black (Carbon), Pickled |
Material Specifications
ASTM A403 stainless steel pipe fittings are manufactured from forged and rolled austenitic stainless steel, suitable for pressure piping applications. Common grades include WP304/L and WP316/L, offering excellent corrosion resistance and mechanical properties.
Chemical Composition (%)
| Grade |
C, max |
Mn |
P, max |
S, max |
Si, max |
Cr |
Mo |
Ni |
Others |
| WP304 |
0.08 |
2.00 |
0.040 |
0.030 |
0.75 |
18.0-20.0 |
-- |
8.0-11.0 |
-- |
| WP304L |
0.035 |
2.00 |
0.040 |
0.030 |
0.75 |
18.0-20.0 |
-- |
8.0-13.0 |
-- |
| WP304H |
0.04-0.10 |
2.00 |
0.040 |
0.030 |
0.75 |
18.0-20.0 |
-- |
8.0-11.0 |
|
| WP321 |
0.08 |
2.00 |
0.040 |
0.030 |
0.75 |
17.0-20.0 |
-- |
9.0-13.0 |
Ti=5×C, max 0.70 |
| WP321H |
0.04-0.10 |
2.00 |
0.040 |
0.030 |
0.75 |
17.0-20.0 |
-- |
9.0-13.0 |
Ti=4×C, max 0.60 |
| WP316 |
0.08 |
2.00 |
0.040 |
0.030 |
0.75 |
16.0-18.0 |
2.00-3.00 |
11.0-14.0 |
-- |
| WP316L |
0.035 |
2.00 |
0.040 |
0.030 |
0.75 |
16.0-18.0 |
2.00-3.00 |
10.0-15.0 |
-- |
| WP316H |
0.04-0.10 |
2.00 |
0.040 |
0.030 |
0.75 |
16.0-18.0 |
2.00-3.00 |
11.0-14.0 |
-- |
Mechanical Properties
| Grade |
Tensile Strength, min. (MPa) |
Yield Strength, min (MPa) |
Elongation (2 "/4D), min (%) |
| WP304 |
515 |
205 |
35 |
| WP304L |
485 |
170 |
35 |
| WP304H |
515 |
205 |
35 |
| WP321 |
515 |
205 |
35 |
| WP321H |
515 |
205 |
35 |
| WP316 |
515 |
205 |
35 |
| WP316L |
485 |
170 |
35 |
| WP316H |
515 |
205 |
35 |
Dimensional Specifications
Short Radius 90° Elbow Dimensions (mm)
![ASME B16.28 Short Radius 90 Degree Elbow dimensional diagram showing outside diameter and center-to-end measurements]()
| NPS |
Outside Diameter at Bevel D (mm) |
Center-to-End A (mm) |
| 1" |
32-34 |
23-27 |
| 2" |
59-61 |
49-53 |
| 4" |
113-116 |
100-104 |
| 6" |
167-171 |
150-154 |
| 8" |
217-221 |
201-205 |
| 12" |
321-328 |
302-308 |
| 16" |
403-410 |
403-409 |
| 20" |
503-514 |
505-511 |
| 24" |
605-616 |
607-613 |
Short Radius 180° Return Dimensions (mm)
![ASME B16.28 Short Radius 180 Degree Return dimensional diagram showing outside diameter, center-to-center, and back-to-face measurements]()
| NPS |
Outside Diameter D (mm) |
Center-to-Center O (mm) |
Back-to-Face K (mm) |
| 1" |
32-34 |
44-58 |
34-48 |
| 2" |
59-61 |
95-109 |
74-88 |
| 4" |
113-116 |
196-210 |
152-166 |
| 6" |
167-171 |
298-312 |
230-244 |
| 8" |
217-221 |
399-413 |
306-320 |
| 12" |
321-328 |
600-620 |
460-474 |
| 16" |
403-410 |
803-823 |
603-617 |
| 20" |
503-514 |
1006-1026 |
755-769 |
| 24" |
605-616 |
1209-1229 |
907-921 |
Applications & Industries
These stainless steel buttwelding fittings are widely used in engineering industries, energy conversion plants, chemical processing, oil and gas, and other applications requiring reliable pressure piping systems with directional flow changes.
