ASTM A815 WP-S32750 Super Duplex Stainless Steel Tee 8 Inch SCH 40S Seamless Butt Weld Fitting for Offshore Oil and Gas Piping

ASTM A815 WP-S32750 Super Duplex Stainless Steel Seamless Tee for Industrial Piping

ASTM A815 WP-S32750 seamless super duplex stainless steel tees are designed for branching connections in industrial piping systems. Manufactured from UNS S32750 super duplex stainless steel, these fittings combine high mechanical strength with resistance to pitting, crevice corrosion and chloride-induced stress corrosion cracking in suitable service environments.

UNS S32750, also known as Super Duplex 2507, is a 25Cr super duplex stainless steel grade containing chromium, nickel and molybdenum, with nitrogen added to enhance its properties. It is commonly selected for demanding applications in offshore engineering, seawater systems, oil and gas processing and chemical plants.

The product shown is marked ASTM A815 WP-S32750-S, 8 inch SCH 40S and ASME B16.9. The WP-S designation identifies seamless construction under ASTM A815. The additional suffix "-S" should be verified against the material certificate and project specification before being described as a sour-service qualification.

YUHONG supplies super duplex stainless steel pipe fittings according to applicable material standards, dimensions and project inspection requirements.

The marking on the reference product includes an additional "-S" suffix. Final grade designation and any supplementary service requirements should be confirmed against the MTC and purchase order.

S32750 contains approximately 25% chromium and 3–5% molybdenum, together with nitrogen. This alloy composition provides high resistance to localized corrosion in many chloride-containing environments.

Super duplex stainless steel is commonly selected for environments where conventional austenitic stainless steels may be susceptible to chloride-induced stress corrosion cracking. Actual performance depends on temperature, chloride concentration, stress and operating conditions.

S32750 offers higher strength than common austenitic stainless steel grades such as 304L and 316L. This can be beneficial in piping systems subject to demanding mechanical and pressure design conditions.

The ferritic-austenitic microstructure contributes to the alloy's mechanical strength and corrosion resistance. Proper solution annealing and rapid cooling are important to maintain the required metallurgical structure and phase balance.

• Offshore oil and gas piping systems
• Seawater handling and desalination equipment
• Chemical and petrochemical processing plants
• Marine engineering systems
• Pressure piping in chloride-containing environments
• Oil and gas production facilities
• Industrial process piping systems

Material selection should be based on the actual fluid composition, temperature, pressure, chloride concentration and applicable project specifications.

Super duplex tees are manufactured to the specified branch configuration and piping dimensions. Important parameters include:

• Nominal pipe size and branch size
• Wall thickness and schedule
• Center-to-end dimensions
• Outside diameter and end preparation
• Dimensional tolerances
• Heat treatment condition
• Surface finish and identification marking
• Applicable supplementary requirements

For the product shown, the marking indicates 8 inch SCH 40S and ASME B16.9. The branch configuration and exact dimensions should be checked against the approved drawing.

Inspection requirements should follow ASTM A815, applicable general requirements and the project purchase specification. Typical inspection items may include:

• Chemical composition analysis
• Tensile testing
• Hardness testing
• Dimensional inspection
• Visual inspection
• Liquid penetrant testing where specified
• Nondestructive examination according to the applicable fitting class
• Ferrite content and metallographic examination where required
• Corrosion testing according to supplementary requirements, if specified

For demanding super duplex applications, additional testing may be required to verify the metallurgical condition and corrosion resistance. These requirements should be agreed before order placement.

Super duplex stainless steel tees are packed according to their dimensions and weight. Typical export packaging includes plywood cases, wooden boxes or securely supported pallets.

Protective materials and end caps can be used to prevent surface damage, contamination and impact during handling and transportation. Custom packaging and marking are available according to project requirements.