Short Description

Model No.: UNS-N07718-90-Degree-Seamless-Elbow-LR-With-BW-Ends-Mirror-Polishing-8-Inch-SCH40S

China 90 Degree Elbow Manufacturer www.pipelinedubai.com offers ANSI B16.9 ASTM B366 UNS N07718 90 Degree Seamless Elbow LR With BW Ends, Mirror Polishing, 8 Inch, SCH40S.

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Key Specifications / Features

Type: UNS N07718 90 Degree Elbow
Material: Nickel Alloy Inconel 718(UNS N07718/WNR. 2.4668)
Degree: 90 Degree
Size: 8″ (DN400)
Standard: ANSI B16.9
Ends: BW

Chemical Composition, % of Nickel Alloy Inconel 718(UNS N07718/WNR. 2.4668)

Inconel
%
Ni
Cr
Fe
Mo
Nb
Co
C
Mn
Si
S
Cu
Al
Ti
718
Min.
50
17
balance
2.8
4.75
0.2
0.7
Max.
55
21
3.3
5.5
1
0.08
0.35
0.35
0.01
0.3
0.8
1.15

Physical Properties of Inconel 718

Typical physical properties of Inconel 718 are summarized in the table below.

Solution Treated Solution Treated and Aged
Density 0.296 lb/in3 (8.192 g/cm3) 0.297 lb/in3 (8.22 g/cm3)
Specific Gravity 8.19 8.22
Melting Range 2500-2600°F 1370-1430°C

Thermal Conductivity of Inconel 718

The thermal conductivity at various temperatures for Inconel 718 are given in the following table.

Temperature Range Co-Efficients
°C °F W/m.K Btu.ft/ft2.hr.°F
0-100 532-212 6.5 11.2

Mechanical Properties

The room temperature strength of the Inconel 718 alloy is substantially increased by precipitation heat treatment as the following data indicate. These values are properties specified for sheet, strip and plate in AMS 5596 and AMS 5597.

Yield Strength
Min
(0.2% offset)
Ultimate Tensile Strength
Min
Elongation
(% in 2″)
Sheet and strip 80,000 psi (550 MPa) 140,000 psi (965 MPa) 30 (min)
Plate 105,000 psi (725 MPa) 150,000 psi (1,035 MPa) 30 (min)

Solution trated plus precipitation heat treated.

Yield Strength
Min
(0.2% offset)
Ultimate Tensile Strength
Min
Elongation
(% in 2″)
150,000 (1,035 MPa) 180,000 psi (1,240 MPa) 12 (min)

Forging
Alloy 718 should be forged from a maximum furnace temperature of 2050ºF (1120ºC) and should not be soaked for an overly long time at this temperature. Uniform reductions during forging will prevent the formation of a duplex grain structure. Working in the range 1700/1850ºF (925/1010ºC) will improve the forging’s strength if its subsequent service temperature is below 1100ºF (595ºC.)
Heat Treatment
Heat treatments may be adjusted to give required properties. For the best combination of tensile and stress rupture properties, the following quite complex cycle is recommended :
1 hr at 1750/1800ºF (955/980ºC) and air cool, then 8 hrs at 1325ºF (720ºC) and cool at 100ºF/hr (56ºC/hr) to 1150ºF (620ºC), hold for 8 hrs and air cool.
For the best room temperature and cryogenic tensile properties, the cycle is :
1-2hrs at 1950ºF (1065ºC) and air cool, then 8 hrs at 1325ºF (720ºC) and cool at 100ºF/hr (56ºC/hr) to 1150ºF (620ºC), hold for 8 hrs and air cool.
Machinability
Inconel 718 may be readily machined in either the annealed or age-hardened conditions. The age-hardened condition gives a better surface finish, the annealed condition a longer tool life.
Weldability
The alloy may be welded in either the aged or annealed conditions. Welding an age-hardened material will result in the formation of a softened heat-affected zone.

Typical short time tensile properties of Inconel 718 as a function of temperature are shown here for material solution treated and aged as follows:

  • Solution Treatment: 1800°F (982°C) 1 hour
  • Precipitation Treatment: 1325°F (718°C) 8 hours, Furnace Cool at 100°F (55°C) per hour to 1150°F (621°C) 8 hours

20186211742482062213 - ANSI B16.9 ASTM B366 UNS N07718 90 Degree Seamless Elbow LR With BW Ends, Mirror Polishing 8 Inch SCH40S

NPS O.D.
D
90°
Long Rad
Center to End
A
45°
Long Rad
Center to End
B
90°
3D
Center to End
A
45°
3D
Center to End
B
1/2 21.3 38 16
3/4 26.7 38 19 57 24
1 33.4 38 22 76 31
42.2 48 25 95 39
48.3 57 29 114 47
2 60.3 76 35 152 63
73 95 44 190 79
3 88.9 114 51 229 95
101.6 133 57 267 111
4 114.3 152 64 305 127
5 141.3 190 79 381 157
6 168.3 229 95 457 189
8 219.1 305 127 610 252
10 273 381 159 762 316
12 323.8 457 190 914 378
14 355.6 533 222 1067 441
16 406.4 610 254 1219 505

In what applications is Inconel 718 used?

1. Chemical processing.
2. Aerospace.
3. Jet engine.
4. Liquid fuel rocket motor components.
5. Pollution-control equipment.
6. Nuclear reactors.
7. Cryogenic storage tanks.
8. Valves, fasteners, pipe fitting, flange, steel pipe, springs, mandrels, tubing hangers.
9. Well head completion equipment and blow out preventers (BOP’s).
10. Gas turbine engine parts.

What are the characteristics of Inconel 718?

1. Good mechanical properties – tensile, fatigue and creep-rupture.
2. Yield tensile strength, creep, and rupture strength properties are exceedingly high.
3. Highly resistant to chloride and sulfide stress corrosion cracking.
Resistant to aqueous corrosion and chloride ion stress corrosion cracking.
4. High temperature resistant.
5. Age-hardenable with a unique property of slow aging response that permits heating and cooling during annealing without the danger of cracking.
6. Excellent welding characteristics, resistant to postweld age cracking.

Standards of Inconel 718

Products form Standard
Rod, bar and wire ASTM B166
Plate, sheet and strip ASTM B168, B906
Seamless pipe and tube ASTM B167, B829
Billet and bar for reforging ASTM B472
Forging ASTM B564

What is Inconel 718?

Designated as UNS N07718 or W.Nr. 2.4668, Inconel 718, also known as “Alloy 718”, is a precipitation-hardenable nickel-chromium alloy containing significant amount of iron, niobium, and molybdenum along with lesser amounts of aluminum and titanium. The titanium and niobium are added to overcome strain-age cracking problems during welding and weld repair. Inconel Alloy 718 combines corrosion resistance and high strength with outstanding weldability, including resistance to postweld cracking. The alloy has excellent creep-rupture strength at temperatures up to 1300°F[700°C]. The Inconel 718 is fabricated for gas turbines, rocket motors, spacecraft, nuclear reactors, pumps and other piping.

Summary
ansi b16 9 astm b366 uns n07718 90 degree seamless elbow lr with bw ends mirror polishing 8 inch sch40s - ANSI B16.9 ASTM B366 UNS N07718 90 Degree Seamless Elbow LR With BW Ends, Mirror Polishing 8 Inch SCH40S
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ANSI B16.9 ASTM B366 UNS N07718 90 Degree Seamless Elbow LR With BW Ends, Mirror Polishing 8 Inch SCH40S
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