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 20 is a nickel-iron-chromium alloy specifically developed to resist sulfuric acid across a wide range of concentrations and temperatures, making it well suited for VCR fittings in sulfuric acid processing and related chemical applications.
Niobium-stabilized nickel-iron-chromium alloy with copper and molybdenum additions, developed specifically for sulfuric acid resistance.
| Element | Weight Percentage (%) |
|---|---|
| Nickel (Ni) | 32.0 - 38.0 |
| Chromium (Cr) | 19.0 - 21.0 |
| Molybdenum (Mo) | 2.00 - 3.00 |
| Copper (Cu) | 3.00 - 4.00 |
| Niobium (Nb) | 8x%C - 1.00 |
| Iron (Fe) | Balance |
| Carbon (C) | 0.07 max |
| Manganese (Mn) | 2.00 max |
*Composition limits are as per the applicable ASTM/ASME/UNS specification; actual limits may vary depending on product form.
Alloy 20 provides excellent resistance to sulfuric acid together with good mechanical properties and weldability.
| Property | Typical / Minimum Value |
|---|---|
| Tensile Strength | 552 MPa min |
| 0.2% Yield Strength | 241 MPa min |
| Elongation | 30% min |
| Hardness | 90 HRB max |
| Density | Approx. 8.1 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.