Super Duplex Pipe Fittings

Super Duplex Pipe Fittings

Super duplex alloys are known to have high resistance to pitting with excellent mechanical strength. These fittings find use in demanding applications.

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Super duplex pipe fittings specification

Super Duplex Pipe Fittings Specification

Super duplex steel buttweld fittings sizes Super duplex elbow meet the requirements 2507 Buttweld fittings schedule chart
  • SDSS seamless fittings : 1/2 – 24″ (BW)
  • Super duplex welded fittings : 24 – 96″ (BW) and large diameter
  • MTC EN 10204-3.1
  • NACE MR0103
  • ISO 15156
  • NACE TM-0284
  • Sour service
  • NACE MR0175
  • SCH 10
  • SCH 60
  • XXH
  • SCH 160
  • SCH 20
  • SCH 80
  • STD
  • XH
  • SCH 40
American standard & specification Super duplex 2507 fittings design standard Super duplex buttweld fittings manufacturing technique
  • Seamless fittings: ASTM A815 wp-s
  • Welded fittings: ASTM A815 wp-x

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  • ANSI/ ASME B16.28
  • ANSI / ASME B16.9
  • ANSI/ ASME B16.25 (butt welding ends)
  • MSS-SP-83
  • MSS-SP-95
  • MSS-SP-43
  •  Hot forming
Ends of SS super duplex buttweld fittings Meet standard Super duplex elbow testing reqirements
  • Bevelled
  • JIS B2312
  • JIS B2313
  • DIN2615
  • DIN2616
  • DIN 2605
  • HIC tested
  • Magnetic Particle Examination (For above Sch 80 Super duplex 2507 pipe fittings bevel ends)
  • Ultrasonic test
  • Positive Material Identification (PMI)

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Super duplex steel bend radius Super duplex bend angle
  • 4D
  • 8D
  • 10D
  • 5D
  • 6D
  • 3D
  • 22.5 Deg
  • 60 Deg
  • 90 Deg
  • 30 Deg
  • 45 Deg

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SDSS pipe bend

Types Standard Dimensions
  • Alloy 2507 long radius bend
  • Super duplex steel mitered pipe bend
  • 25cr duplex 2.5d pipe bend
  • SDSS 3d pipe bend
  • Super duplex steel 5d pipe bend
  • 2507 stainless steel short radius bend
  • Super duplex return bend
  • SDSS J bend
  • SAF 2507 L bend
  • 2507 super duplex stainless steel piggable bend
  • 25cr duplex hot induction bend
  • SDSS 10d pipe bend
  • Super duplex 22d pipe bend
  • 2507 duplex stainless steel seamless pipe bend
  • EN 1.4410 welded pipe bend
  • ASME B16.49
  • ASME B16.9
  • EN/ DIN 1.4410
  • DN15 – DN 1500
  • OD 1/2” to 60”

Types of super duplex elbow

Types Standard Dimensions
  • 90 degree Types of super duplex elbow
  • 180 degree super duplex 2507 elbow
  • Sdss super duplex stainless steel 3d elbow
  • SS super duplex buttweld elbow
  • Super duplex stainless long radius elbow
  • SDSS short radius elbow
  • 45 degree steel super duplex elbow
  • DIN 2615
  • JIS B2312
  • ASME B16.9
  • 1/2” – 48”

Types of Super duplex stainless steel tee & reducer

Types Standard Dimensions
  • 2507 super duplex stainless steel buttweld tee
  • Steel super duplex concentric reducer
  • Stainless steel super duplex eccentric reducer
  • SS super duplex buttweld reducer
  • 2507 stainless steel swept tee
  • Super duplex alloy saddle tee
  • Alloy 2507 barred tee
  • 25cr duplex reducing tee
  • 25cr duplex stainless steel equal tee
  • SS super duplex lateral tee
  • SDSS Y tee
  • ASME B16.9
  • 1/2” – 48”

Types of Super duplex stainless stub end & cap

Types Standard Dimensions
  • Steel super duplex short stub end
  • Super duplex long stub end
  • 25cr Super duplex lap joint stub end
  • SDSS seamless end cap
  • Super duplex 2507 welded end cap
  • MSS SP-43 type B
  • MSS SP-43 type C
  • MSS SP-43 type A
  • ASME B16.9
  • 1/2” – 36”

Equivalent standard of Super duplex buttweld fittings

Grade SDSS STANDARD WERKSTOFF NR.
SDSS 2507 ASTM A815 UNS S32750 1.4410/ F53
SDSS 2507 ASTM A815 UNS S32760 1.4410/ F55

Chemical composition of super duplex welded fittings

UNS Number Duplex Grades S32750 S32760
C 0.03 0.03
Mn 1.2 1
P 0.035 0.03
S 0.02 0.01
Si 0.8 1
Cr 24.0-26.0 24.0-26.0
Ni 6.0-8.0 6.0-8.0
Mo 3.0-5.0 3.0-4.0
N 0.24-0.32 0.20-0.30
Cu 0.5 0.50-1.00
Other W 0.50-1.0

Mechanical properties of super duplex 2507 pipe fittings

Grade S32750 S32760
Tensile strength, min., ksi [MPa] 116 [800] 109 [750]
Yield strength, min., ksi [MPa] 80 [550] 80 [550]
Elongation in 2 in., or 50mm, min, % 15 25
Hardness, Max Brinell 310 300

Super duplex 2507 buttweld fittings physical properties

Density lb/in3 0.28
Modulus of Elasticity psi x 106 29
Coefficient of Thermal Expansion 68-212°F/°F x10-6/°F 7.2
Thermal Conductivity Btu/h ft °F 8.7
Heat Capacity Btu/lb/°F 0.12
Electrical Resistivity W-in x 10-6 31.5

Super Duplex Pipe Fittings Properties

Super duplex buttweld fittings grades

Super duplex tee dimensions

Super duplex tee dimensions

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In comparison to high nickel alloy grades, Super Duplex Pipe Fittings have lower costs. But if compared to conventional stainless steel like grade 304, the super duplex tee has a higher cost. However, though the alloy is expensive, the properties exhibited by it surpass traditional fittings. Furthermore, they prove to be cost-effective compared to either 904L or 6% moly super austenitic stainless steel.

The alloy has good weldability properties. It can be welded using the following techniques – flux cored wire (FCW), gas tungsten arc welding (GTAW), plasma arc welding (PAW), shielded metal arc welding (SMAW), or submerged arc welding (SAW).

Stub ends are preferred in applications which need to have reduced costs in a flange joint. Stub ends make it simple for the worker to align the bolt holes of the mating flanges during installation.

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Super Duplex Buttweld Fittings have good corrosion resistance properties. To improve this property, fittings are surface treated. Black oil, cadmium plating, zinc electroplating, and galvanization are all surface treatments that prolong the life span of the alloy. Heat treatment can reduce the risk of intergranular corrosion.

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The most important feature of these fittings is perhaps their resistance to chloride stress corrosion cracking. In addition to resistance from SCC, they are resilient to local attacks like pitting and crevice corrosion.

The fittings have high mechanical strength, useful in demanding industries like offshore oil and gas applications. It has exceptional resistance to chloride stress corrosion cracking, enabling its use in chemical processing and marine engineering sectors.