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.
SS 904L is a high-alloy super-austenitic stainless steel with high nickel, molybdenum and copper content, offering excellent resistance to sulfuric acid and chloride-induced corrosion for demanding VCR fitting applications.
Super-austenitic stainless steel combining high nickel and molybdenum content for outstanding resistance to acids and chloride pitting.
| Element | Weight Percentage (%) |
|---|---|
| Carbon (C) | 0.020 max |
| Chromium (Cr) | 19.0 - 23.0 |
| Nickel (Ni) | 23.0 - 28.0 |
| Molybdenum (Mo) | 4.00 - 5.00 |
| Copper (Cu) | 1.00 - 2.00 |
| Nitrogen (N) | 0.10 max |
| Manganese (Mn) | 2.00 max |
| Silicon (Si) | 1.00 max |
| Phosphorus (P) | 0.045 max |
| Sulfur (S) | 0.035 max |
| Iron (Fe) | Balance |
*Composition limits are as per the applicable ASTM/ASME/UNS specification; actual limits may vary depending on product form.
904L provides high resistance to sulfuric and phosphoric acid environments together with good ductility.
| Property | Typical / Minimum Value |
|---|---|
| Tensile Strength | 490 MPa min |
| 0.2% Yield Strength | 220 MPa min |
| Elongation | 35% min |
| Hardness | 90 HRB 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.
Used in process piping and instrumentation systems handling corrosive fluids across chemical plants.
Hygienic-grade connections for food, dairy and beverage processing lines requiring cleanability.
Suited for high-purity process lines where contamination control and corrosion resistance are critical.
Reliable performance in upstream and downstream piping systems exposed to varying process media.
Corrosion-resistant fittings for shipboard piping and offshore support systems.
Withstands bleaching and pulping process chemicals in paper manufacturing plants.