A403 WP304L-S Cap, B16.9 Low-Carbon Stainless Steel Butt Weld Fitting For Hydraulic Engineering
A403 WP304L-S Cap, B16.9 Low-Carbon Stainless Steel Butt Weld Fitting For Hydraulic Engineering
Overwiew
A403 WP304L stainless steel seamless cap is a pressure-containing component used to close the end of a piping system, manufactured in strict compliance with ASME B16.9 dimensional standards. It features a "seamless structure" to eliminate potential weld line defects and undergoes solution annealing treatment to restore the excellent intergranular corrosion resistance of low-carbon austenitic stainless steel (304L). It is particularly suitable for pressure piping systems with extremely high requirements for corrosion resistance and hygiene, such as those in the petrochemical, nuclear power, food, and pharmaceutical industries.
Forming process of Stainless steel cap
Due to being a "seamless" pipe cap, its manufacturing usually starts from steel pipes or plates and is processed through plastic forming, with the main process being stamping
- Hot pressing: Place the heated blank into the mold for stamping. For thin-walled pipe caps, to prevent wrinkling, a two-stage forming method is used: first stamping into a disc shape, and then finally forming.
- Cold pressing: Pressing through a mold at room temperature, suitable for pipe caps with thin wall thickness or small size.
- Subsequent processing: After forming, it is necessary to perform groove processing (for on-site welding, usually according to ASME B16.25 standard) and necessary shaping to ensure dimensional accuracy
Chemical Composition of A403 WP304L Cap
| Grade | C | Ni | Si | N | S | Mn | P | Cr | Mo | |
| SS 304L | min. | - | 8.0 | - | - | - | - | - | 18.0 | - |
| max. | 0.030 | 12.0 | 0.75 | 0.10 | 0.030 | 2.0 | 0.045 | 20.0 | ||
Mechanical Properties of ASTM A403 WP304L Cap
| Grade | Tensile Strength (MPa) min | Elongation (% in 50mm) min | Yield Strength 0.2% Proof (MPa) min | Hardness | |
| Rockwell B (HR B) max | Brinell (HB) max | ||||
| SS 304L | 485 | 40 | 170 | 92 | 201 |
Equivalent Grades of WP304L
| STANDARD | UNS | WERKSTOFF NR. | AFNOR | EN | JIS | BS | GOST |
| SS 304L | S30403 | 1.4306/1.4307 | Z3CN18‐10 | X2CrNi18-9 / X2CrNi19-11 | SUS 304L | 304S11 | 03Х18Н11 |
Inspection for A403 WP304L-S Cap
| Inspection Category | Specific Inspection Items | Brief Description |
|---|---|---|
| Raw Material Inspection | Chemical composition analysis, Mechanical property testing | To verify that the material meets WP304L standards (e.g., low carbon requirements) and ensure the strength is up to specification. |
| Non-Destructive Examination (NDE) | Ultrasonic Testing (UT), Penetrant Testing (PT), Radiographic Testing (RT), Magnetic Particle Testing (MT) | To detect the presence of internal or surface defects such as cracks and laminations. This is the core of quality control for WP grade seamless caps. |
| Dimension & Visual Inspection | Dimensional inspection, Wall thickness measurement, Visual surface examination | To ensure dimensions comply with standards such as ASME B16.9, wall thickness is uniform, and the surface is free from imperfections that would affect service. |
Application field
- Petroleum, Natural Gas, and Chemical Industry
- Electricity and Energy
- Food and Medicine
- Ship and Ocean Engineering
- water treatment
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