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.
Designed for highly corrosive chemical services where conventional stainless grades are not suitable. Hastelloy pressure relief valves provide dependable protection in oxidizing, reducing and mixed acid environments, with grade selection based on the process media and temperature conditions.
High-Performance Flow & Safety Instrumentation Solutions
Hastelloy C276 is a nickel-molybdenum-chromium alloy known for outstanding resistance to pitting, crevice corrosion and a wide range of aggressive chemical media.
| Element | Weight Percentage (%) |
|---|---|
| Nickel (Ni) | Balance |
| Molybdenum (Mo) | 15.0 - 17.0 |
| Chromium (Cr) | 14.5 - 16.5 |
| Iron (Fe) | 4.0 - 7.0 |
| Tungsten (W) | 3.0 - 4.5 |
| Cobalt (Co) | 2.5 max |
| Carbon (C) | 0.010 max |
| Manganese (Mn) | 1.00 max |
| Silicon (Si) | 0.08 max |
| Sulfur (S) | 0.030 max |
*Composition limits are indicative for the listed grade family; applicable product specifications may vary depending on valve component and product form.
Hastelloy C276 combines good mechanical strength with exceptional corrosion resistance in severe chemical process environments.
| Property | Typical / Minimum Value |
|---|---|
| Tensile Strength | 690 MPa min |
| 0.2% Yield Strength | 283 MPa min |
| Elongation | 40% min |
| Hardness | Approx. 100 HRB max |
| Density | Approx. 8.9 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 pressure relief valve component.
Hastelloy B2 is a nickel-molybdenum alloy developed specifically for reducing environments, offering outstanding resistance to hydrochloric acid at all concentrations and temperatures.
| Element | Weight Percentage (%) |
|---|---|
| Molybdenum (Mo) | 26.0 - 30.0 |
| Iron (Fe) | 2.00 max |
| Chromium (Cr) | 1.00 max |
| Cobalt (Co) | 1.00 max |
| Manganese (Mn) | 1.00 max |
| Silicon (Si) | 0.10 max |
| Carbon (C) | 0.02 max |
| Phosphorus (P) | 0.04 max |
| Sulfur (S) | 0.03 max |
| Nickel (Ni) | Balance |
*Composition limits are as per the applicable ASTM/ASME specification for UNS N10665; actual limits may vary depending on valve component and product form.
Hastelloy B2 in the solution annealed condition provides high ductility and good tensile strength, allowing reliable sealing performance in aggressive acid service.
| Property | Typical / Minimum Value |
|---|---|
| Tensile Strength | 760 MPa min |
| 0.2% Yield Strength | 350 MPa min |
| Elongation | 40% min |
| Hardness | Approx. 230 HB |
| Density | Approx. 9.24 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 pressure relief valve component.
Hastelloy C22 is a nickel-chromium-molybdenum-tungsten alloy with better overall corrosion resistance than C276 in oxidising media, and strong resistance to pitting, crevice corrosion and stress corrosion cracking.
| Element | Weight Percentage (%) |
|---|---|
| Chromium (Cr) | 20.0 - 22.5 |
| Molybdenum (Mo) | 12.5 - 14.5 |
| Tungsten (W) | 2.5 - 3.5 |
| Iron (Fe) | 2.0 - 6.0 |
| Cobalt (Co) | 2.50 max |
| Vanadium (V) | 0.35 max |
| Manganese (Mn) | 0.50 max |
| Silicon (Si) | 0.08 max |
| Carbon (C) | 0.015 max |
| Phosphorus (P) | 0.02 max |
| Sulfur (S) | 0.02 max |
| Nickel (Ni) | Balance |
*Composition limits are as per the applicable ASTM/ASME specification for UNS N06022; actual limits may vary depending on valve component and product form.
Hastelloy C22 offers a high level of ductility along with dependable strength, and resists formation of grain boundary precipitates in the weld heat affected zone of fabricated valve components.
| Property | Typical / Minimum Value |
|---|---|
| Tensile Strength | 690 MPa min |
| 0.2% Yield Strength | 310 MPa min |
| Elongation | 45% min |
| Hardness | Approx. 210 HB |
| Density | Approx. 8.69 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 pressure relief valve component.
High-performance material specifications for our complete Pressure Relief Valve range.
Designed for demanding pressure systems where material compatibility, corrosion resistance and reliable pressure protection are essential.
Preferred for acids, chlorides, solvents and aggressive chemical transfer systems.
Used where clean, corrosion-resistant pressure protection is required.
Suitable for scrubbers, flue gas systems and chloride-bearing condensates.
Reliable in corrosive refinery and petrochemical process lines.
Used in bleaching chemicals and oxidizing chloride environments.
Selected for sulfuric, hydrochloric and mixed acid service after media review.
Pipe-Lok Vales & Fittings manufactures high-quality alternatives to the following standard industry part numbers
| Swagelok Part No. | Pipe-Lok Vales & Fittings Equivalent | Availability |
|---|---|---|
| SS-4R3A | Available | Ready to Ship |
| SS-4R3A1 | Available | Ready to Ship |
| SS-4R3A5 | Available | Ready to Ship |
| SS-4R3A5-BU | Available | Ready to Ship |
| SS-4R3A5-EP | Available | Ready to Ship |
| SS-4R3A5-KZ | Available | Ready to Ship |
| SS-4R3A5-NE | Available | Ready to Ship |
| SS-4R3A5-RT | Available | Ready to Ship |
| SS-4R3A-BU | Available | Ready to Ship |
| SS-4R3A-EP | Available | Ready to Ship |
| SS-4R3A-KZ | Available | Ready to Ship |
| SS-6R3A-MM | Available | Ready to Ship |
| SS-8R3A-MM | Available | Ready to Ship |
| SS-R4M8F8 | Available | Ready to Ship |
| SS-R4M8S8 | Available | Ready to Ship |
| SS-R4S8 | Available | Ready to Ship |
| SS-R4S12MM | Available | Ready to Ship |
| SS-RL3M4-F4 | Available | Ready to Ship |
| SS-RL3M4F4-RT | Available | Ready to Ship |
| SS-RL3M4-S4 | Available | Ready to Ship |
| SS-RL3S4 | Available | Ready to Ship |
| SS-RL3S4-SC11 | Available | Ready to Ship |
| SS-RL3S4-EP | Available | Ready to Ship |
| SS-RL3S4-MO | Available | Ready to Ship |
| SS-RL3S4-KZ-11002 | Available | Ready to Ship |
| SS-RL3S6MM | Available | Ready to Ship |
| SS-RL3S8MM | Available | Ready to Ship |
| SS-RL4M8F8 | Available | Ready to Ship |
| SS-RL4MR8 | Available | Ready to Ship |
| SS-RL4S8 | Available | Ready to Ship |
| SS-RL4S12MM | Available | Ready to Ship |