ANSI B16.9 ASTM B366 Legering 718 90 graders sømløs lang radius albue spejlpolering DN400 SCH40S

Type: Alloy 718 90 Degree Elbow
Materiale: Nickel Alloy Inconel 718(UNS N07718/WNR. 2.4668)
Degree: 90 Degree
Størrelse: 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
Densitet	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.

	Udbyttestyrke Min (0.2% offset)	Ultimate Tensile Strength Min	Forlængelse (% 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.

Udbyttestyrke Min (0.2% offset)	Ultimate Tensile Strength Min	Forlængelse (% 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

NPS	O.D. D	90° Long Rad Fra centrum til slut A	45° Long Rad Fra centrum til slut B	90° 3D Fra centrum til slut A	45° 3D Fra centrum til slut B
1/2	21.3	38	16	...	...
3/4	26.7	38	19	57	24
1	33.4	38	22	76	31
1¼	42.2	48	25	95	39
1½	48.3	57	29	114	47
2	60.3	76	35	152	63
2½	73	95	44	190	79
3	88.9	114	51	229	95
3½	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. Ventiler, fasteners, pipe fitting, flange, stålrør, 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.