ASME SA403 is a specification that pertains to wrought austenitic stainless steel buttweld fittings, designed to excel in both high-temperature and corrosive service applications. These fittings, crucial components in industries like oil and gas, petrochemicals, and power generation, offer a blend of resilience and corrosion resistance.
These fittings are crafted through a meticulous process involving the shaping of stainless steel plates, sheets, or pipes, followed by welding to create the desired form. The welding can be seamless or welded, depending on the application's requirements. Adhering to the dimensional and testing standards set forth by the American Society of Mechanical Engineers (ASME), these fittings guarantee quality and performance. Diverse in function, ASME SA403 fittings encompass a variety of types, such as elbows for directional alterations, tees for flow division, reducers for connecting different pipe sizes, caps for terminations, and crosses for multi-directional flow.
They find homes in industries where corrosion resistance and elevated-temperature tolerance are paramount. Examples include petrochemical and chemical plants, oil refineries, power generation facilities, and even sectors like food processing, pharmaceuticals, and water treatment. The hallmark feature of these fittings is their superior corrosion resistance, an attribute intrinsic to austenitic stainless steel. This property ensures their durability in harsh environments, reducing the need for extensive maintenance. Regular inspection and upkeep, however, remain prudent to ensure the ongoing reliability and longevity of the entire piping system.
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Specification:
| Aspect | Details |
| Specification | ASME SA403 |
| Fitting Material | Wrought Austenitic Stainless Steel |
| Material Grades | - 304/304L (UNS S30400/S30403)<br>- 316/316L (UNS S31600/S31603)<br>- 317/317L (UNS S31700/S31703)<br>- 321/321H (UNS S32100/S32109)<br>- 347/347H (UNS S34700/S34709)<br>And more |
| Manufacturing Process | Shaping stainless steel plates, sheets, or pipes followed by buttwelding |
| Fitting Types | - Elbows (Change flow direction)<br>- Tees (Combine or split flow)<br>- Reducers (Connect pipes of different sizes)<br>- Caps (Terminate pipes)<br>- Stub Ends (For flange connections requiring rotation)<br>- Crosses (Four outlets for multi-directional flow)<br>- And custom fittings |
| Applications | - Petrochemical and Chemical Plants<br>- Oil and Gas Refineries<br>- Power Generation<br>- Food and Beverage Processing<br>- Pharmaceuticals<br>- Water Treatment<br>- HVAC Systems<br>And more |
| Corrosion Resistance | Excellent corrosion resistance due to austenitic stainless steel composition |
| Maintenance | Regular inspection and cleaning recommended for prolonged reliability |
Chemical Properties of Asme-SA403-Stainless steel buttweld fittings
| Grade | Ni | C | Mo | Mn | Si | Fe | Cu | S | P | Cr | Asme SA403 Stainless steel buttweld fittings | 0.50 max | 0.28-0.33 | 0.15-0.25 | 0.40-0.60 | 0.15-0.35 | 97.3-98.22 | - | 0.025 MAX | 0.035 MAX | 0.80-1.10 |
Mechnical properties Asme SA403 Stainless steel buttweld fittings
| Density | Melting Point | Yield Strength (0.2%Offset) | Tensile Strength | Elongation |
| 0.28 | 2580 | 460 MPa | 560 MPa | 20 % |
Asme SA403 Stainless steel buttweld fittings
- Good general corrosion resistance and high strength
- Good sulfide stress corrosion resistance
- Resistance to chloride pitting and crevice corrosion
- Higher resistance to chloride stress corrosion cracking
- Easy to weld and conform
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Applications Industry
| Pharmaceutical Equipment | Chemical Equipment |
| Sea Water Equipment | Heat Exchangers |
| Heat Exchangers | Gas Processing |
| Condensers | Specialty Chemicals |
| Pulp and Paper Industry | Pharmaceuticals |
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