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.
Engineered for superior mechanical strength and exceptional resistance to pitting, crevice, and stress corrosion cracking in aggressive chloride-containing environments. The Super Duplex series (2507/2506) is the ideal choice for high-pressure relief applications in offshore, marine, and chemical processing industries where standard austenitic grades fail.
High-Performance Flow & Safety Instrumentation Solutions
Super Duplex UNS S32750 combines high chromium, molybdenum and nitrogen content to provide excellent strength and resistance to pitting, crevice corrosion and chloride stress corrosion cracking.
| Element | Weight Percentage (%) |
|---|---|
| Chromium (Cr) | 24.0 - 26.0 |
| Nickel (Ni) | 6.0 - 8.0 |
| Molybdenum (Mo) | 3.0 - 5.0 |
| Nitrogen (N) | 0.24 - 0.32 |
| Carbon (C) | 0.030 max |
| Manganese (Mn) | 1.20 max |
| Silicon (Si) | 0.80 max |
| Phosphorus (P) | 0.035 max |
| Sulfur (S) | 0.020 max |
| Copper (Cu) | 0.50 max |
| Iron (Fe) | Balance |
*Composition limits are for UNS S32750; applicable product specifications may vary depending on valve component and product form.
Super Duplex UNS S32750 provides significantly higher strength than conventional austenitic stainless steels while maintaining good ductility and excellent corrosion resistance.
| Property | Typical / Minimum Value |
|---|---|
| Tensile Strength | 795 MPa min |
| 0.2% Yield Strength | 550 MPa min |
| Elongation | 15% min |
| Hardness | 310 HB max |
| Density | Approx. 7.8 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.
Super Duplex 2506 (UNS S32506) is a duplex stainless steel with a balanced ferritic-austenitic structure and a small tungsten addition, offering high strength together with strong resistance to chloride pitting and stress corrosion cracking.
| Element | Weight Percentage (%) |
|---|---|
| Chromium (Cr) | 24.0 - 26.0 |
| Nickel (Ni) | 5.5 - 7.2 |
| Molybdenum (Mo) | 3.0 - 3.5 |
| Nitrogen (N) | 0.08 - 0.20 |
| Tungsten (W) | 0.05 - 0.30 |
| Carbon (C) | 0.030 max |
| Manganese (Mn) | 1.00 max |
| Silicon (Si) | 0.90 max |
| Phosphorus (P) | 0.040 max |
| Sulfur (S) | 0.015 max |
| Iron (Fe) | Balance |
*Composition limits are as per the applicable ASTM/ASME specification for UNS S32506; actual limits may vary depending on valve component and product form.
UNS S32506 delivers roughly twice the yield strength of standard austenitic stainless steel while retaining good ductility and impact toughness for pressure-retaining valve components.
| Property | Typical / Minimum Value |
|---|---|
| Tensile Strength | 690 MPa min |
| 0.2% Yield Strength | 450 MPa min |
| Elongation | 18% min |
| Hardness | 290 HB max |
| Density | Approx. 7.8 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 high strength, corrosion resistance and reliable pressure protection are essential.
Suitable for offshore platforms, pipelines, production systems and high-pressure oil and gas installations.
Reliable pressure protection for chemical processing, refining and aggressive process environments.
Ideal for seawater systems and offshore equipment where chloride corrosion resistance is critical.
Used in corrosive process lines, reactors and chemical handling systems requiring dependable pressure control.
Suitable for high-pressure process systems and auxiliary equipment used throughout power generation facilities.
Excellent for desalination, seawater handling and industrial water treatment systems.
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 |