Industrial operations in highly corrosive environments such as oil refining and chemical processing demand piping systems that combine exceptional strength with superior corrosion resistance. Super duplex steel pipes, particularly grades 2507 (UNS S32750) and S32760, have emerged as the material of choice for these challenging applications.
The Superior Performance of Super Duplex Steel
Super duplex steel represents an advanced category of ferritic-austenitic stainless steel that outperforms standard duplex grades. This material family offers an optimal balance of high mechanical strength, excellent toughness, and outstanding corrosion resistance, making it increasingly vital for critical applications in oil and gas, chemical processing, and marine engineering.
2507 (UNS S32750): Optimized for Strength and Corrosion Resistance
The 2507 super duplex steel contains 25% chromium, 4% molybdenum, and 7% nickel in its chemical composition. This specific alloy formulation delivers exceptional performance in demanding environments:
-
Chemical processing:
Resistant to various corrosive media, ensuring operational safety
-
Petrochemical applications:
Capable of withstanding high temperatures and pressures for stable operations
-
Marine equipment:
Excellent resistance to seawater corrosion, significantly extending service life
S32760: Enhanced Corrosion Resistance
The S32760 grade builds upon the S32750 formulation with the addition of tungsten (W) and copper (Cu) elements. These enhancements provide superior performance in chloride-rich environments:
-
Improved resistance to localized corrosion including pitting and crevice corrosion
-
Enhanced protection against stress corrosion cracking
These properties make S32760 particularly suitable for marine engineering, chemical processing, and environmental applications.
Technical Specifications
Chemical Composition
|
Grade
|
C≤
|
Mn≤
|
P≤
|
S≤
|
Si≤
|
Ni
|
Cr
|
Mo
|
N
|
Cu
|
|
S32750
|
0.03
|
1.20
|
0.035
|
0.02
|
0.80
|
6.0-8.0
|
24.0-26.0
|
3.0-5.0
|
0.24-0.32
|
0.5
|
|
S32760
|
0.05
|
1.00
|
0.03
|
0.01
|
1.00
|
6.0-8.0
|
24.0-26.0
|
3.0-4.0
|
0.20-0.30
|
0.50-1.00
|
Mechanical Properties
|
Mechanical Property
|
Tensile Strength, min, ksi[MPa]
|
Yield Strength, min, ksi[MPa]
|
Elongation, % (min)
|
Hardness, HB (max)
|
|
S32750
|
116 [800]
|
80 [550]
|
15
|
300
|
|
S32760
|
109 [750]
|
80 [550]
|
25
|
300
|
Product Specifications and Standards
Super duplex steel pipes are manufactured according to stringent international standards including ASME SA789/ASTM A789 (for general purpose ferritic/austenitic stainless steel seamless and welded tubes) and ASME SA790/ASTM A790 (for seamless and welded ferritic/austenitic stainless steel pipes).
Available Dimensions
-
Seamless pipes:
4 to 219 mm (outer diameter) with wall thickness ranging from 0.5 to 20 mm
-
Welded pipes:
5.0 mm to 1219.2 mm in diameter
Wall Thickness Options
Available in standard schedules including SCH5, SCH10, SCH10S, SCH20, SCH30, SCH40, SCH40S, STD, XS, SCH60, SCH80, SCH120, SCH140, SCH160, and XXS.
Quality Assurance
Manufacturers implement comprehensive quality control measures to ensure product reliability:
-
Hardness testing to verify material properties
-
Flattening tests to assess material plasticity and weld quality
-
Pitting resistance testing for corrosion evaluation
-
Spectroscopic chemical composition analysis
-
Metallographic examination of microstructure
-
Flaring tests for material plasticity assessment
-
Intergranular corrosion testing
-
Mechanical property testing including tensile and yield strength measurements
-
Positive Material Identification (PMI) for grade verification
Industrial Applications
Super duplex steel pipes serve critical functions across multiple industries:
-
Oil well tubing for extraction and transportation
-
Gas transmission pipelines
-
Fluid handling systems
-
High-pressure boilers and heat exchangers
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