Pipe-Lok Vales & Fittings Company delivers precision-engineered instrumentation fittings and valves trusted for reliability, safety, and performance in industrial applications with a strong focus on engineering excellence and quality control.
Alloy 28 is a nickel-iron-chromium-molybdenum alloy developed for resistance to hot phosphoric and sulfuric acid environments, well suited for VCR fittings in fertilizer and acid processing applications.
High-alloy austenitic material with balanced nickel, chromium and molybdenum content, developed for phosphoric and sulfuric acid resistance.
| Element | Weight Percentage (%) |
|---|---|
| Nickel (Ni) | 30.0 - 34.0 |
| Chromium (Cr) | 26.0 - 28.0 |
| Molybdenum (Mo) | 3.0 - 4.0 |
| Copper (Cu) | 0.6 - 1.4 |
| Iron (Fe) | Balance |
| Carbon (C) | 0.03 max |
| Manganese (Mn) | 2.50 max |
| Nitrogen (N) | 0.05 max |
*Composition limits are as per the applicable ASTM/ASME/UNS specification; actual limits may vary depending on product form.
Alloy 28 provides good resistance to hot acids together with adequate strength and weldability for fitting applications.
| Property | Typical / Minimum Value |
|---|---|
| Tensile Strength | 555 MPa min |
| 0.2% Yield Strength | 215 MPa min |
| Elongation | 30% min |
| Hardness | 187 HB max |
| Density | Approx. 8.0 g/cm³ |
*Mechanical requirements depend on product form, heat treatment and applicable ASTM/ASME specification. Confirm final values against the material specification used for the VCR fitting component.
High-performance material specifications for our complete VCR Fittings range.
Engineered for demanding fluid and gas-handling systems where leak-tight sealing, corrosion resistance and long service life are essential.
High-temperature, sour-service piping and wellhead systems in upstream operations.
Engine components and high-temperature piping systems demanding exceptional heat resistance.
Handles highly corrosive acids and process chemicals in demanding chemical plants.
Used in flue-gas desulfurization and high-temperature power plant piping systems.
Resists chloride attack in seawater and marine process environments.
Suited for scrubber systems and emission-control equipment exposed to acidic gases.