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quality Super Duplex Stainless Steel Pipes A790 UNS S32760 with High PREN and Excellent Corrosion Resistance for High Strength Applications factory
quality Super Duplex Stainless Steel Pipes A790 UNS S32760 with High PREN and Excellent Corrosion Resistance for High Strength Applications factory
quality Super Duplex Stainless Steel Pipes A790 UNS S32760 with High PREN and Excellent Corrosion Resistance for High Strength Applications factory

Super Duplex Stainless Steel Pipes A790 UNS S32760 with High PREN and Excellent Corrosion Resistance for High Strength Applications

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spiral welded steel pipe

lsaw steel tube

black steel pipe
Product Summary
A790 UNS S32760 super duplex stainless steel pipes offer high strength and excellent resistance to pitting, crevice corrosion, and stress corrosion cracking in aggressive environments like offshore, chemical, and desalination. With high Cr, Mo, N, plus Cu and W additions, they provide superior performance in chloride-rich media.

Product Details

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High PREN Super Duplex Stainless Steel Pipes

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Excellent corrosion resistance A790 UNS S32760 Pipes

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High mechanical strength Duplex Stainless Steel Pipes
Product Description
SUPER DUPLEX A790 UNS32760 Stainless Steel Pipes
Product Overview

A790 UNS S32760 is a super duplex stainless steel grade commonly used for pipes and tubing in aggressive environments including offshore, chemical processing, and desalination applications. Its optimized alloy composition delivers exceptional strength and superior resistance to pitting, crevice corrosion, and stress corrosion cracking, particularly in chloride-containing media.

Chemical Composition

Typical chemical composition range for UNS S32760 (as specified in ASTM A790 pipes):

Element Composition Range
Chromium (Cr) 24.0 – 26.0%
Nickel (Ni) 6.0 – 8.0%
Molybdenum (Mo) 3.0 – 4.0%
Copper (Cu) 0.5 – 1.0%
Tungsten (W) 0.5 – 1.0%
Nitrogen (N) 0.20 – 0.30%
Manganese (Mn) ≤ 1.0%
Silicon (Si) ≤ 1.0%
Carbon (C) ≤ 0.03%
Phosphorus (P) ≤ 0.03%
Sulfur (S) ≤ 0.02%
Iron (Fe) Balance (remainder)
Composition Benefits
High Chromium + Molybdenum + Nitrogen

These elements combine to deliver a very high PREN (Pitting Resistance Equivalent Number), typically exceeding 40, classifying S32760 as "super duplex." This makes it ideal for seawater, brine, and other chloride-rich environments.

Duplex Structure (Ferrite + Austenite)

The balanced composition of Cr, Ni, Mo, and N creates an approximate 50/50 ferrite-austenite microstructure, providing:

  • Higher yield strength compared to austenitic grades like 316L
  • Superior stress corrosion cracking resistance versus standard stainless steels
Copper and Tungsten Additions

Copper enhances resistance to reducing non-oxidizing acids and sour-service environments, while tungsten further improves localized corrosion resistance.

Low Carbon, Phosphorus, and Sulfur

Minimizing these elements improves weldability, toughness, and resistance to intergranular corrosion.

Application Guidance

When selecting A790 UNS S32760 pipes, verify these composition ranges in the mill test certificate (MTC). For critical applications such as offshore, subsea, and high-chloride service, designers typically calculate the actual PREN using certified Cr, Mo, and N contents to ensure compliance with project specifications.

Summary

A790 UNS S32760 super duplex stainless steel pipes feature high chromium, molybdenum, and nitrogen content with copper and tungsten additions, low carbon levels, and a duplex microstructure. This combination delivers exceptional corrosion resistance and high mechanical strength for demanding industrial environments.

Mrs. amy

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