Alloy N07718 Tube

Alloy N07718 Tube is a nickel-chromium-based superalloy designed to conquer extreme environments. HT PIPE is a reputable supplier and exporter. Our inventory includes Alloy N07718 Tube, plates, bars, alongside high-quality fittings, flanges, and fasteners. Reach out today for competitive pricing and detailed specifications-no obligation, just expert support.

 

alloy 718 tube A Strong Matrix

The Nickel-Chromium Matrix. The nickel base imparts the alloy's exceptional high-temperature strength, toughness, and excellent corrosion resistance. The addition of chromium forms a stable chromium oxide (Cr₂O₃) protective film, imparting excellent oxidation and hot corrosion resistance.

 

in718 Key Strengthening Mechanism

γ'' and γ' Phases. The true strength of Inconel 718 lies in its precipitation-strengthening phases. By adding niobium (Nb), molybdenum (Mo), titanium (Ti), and aluminum (Al), heat treatment precipitates the matrix-coherent, dispersed metastable phase γ'' (Ni₃Nb) and the stable phase γ' (Ni₃(Al, Ti)). These nanoscale strengthening phases effectively hinder dislocation motion, significantly enhancing the alloy's strength, especially at high temperatures.

 

Specification Inconel 718 Tube

ASTM Specification	AMS 5590, AMS 5589
International Specification	WERKSTOFF Nr 2.4668 , UNS N07718
Standard	GB, DTD, ASME, AISI, ASTM, TOCT, JIS, NF, SAE, DIN, AMS, DS, EN
Size of Seamless Pipe	Wall thickness.: 0.05- 20 milimeter, 4 - 219 milimeter
Size of Welded Pipe	5.0 to 1219.02 milimeter
size of EFW Pipe	5.0 to 1219.02 milimeter
Seamless Tube Size	3.35 milimeter To 101.6 milimeter OD
Welded Tube Size	6.35 milimeter To 152 milimeter OD
Bwg & Swg	18 Swg., 14 20 Swg., Swg. Swg., 12 16 Swg., 10 Swg.
Tubing wall thickness	0.020" –0.220", (custom wall thicknesses available)
Pipe Schedule	SCH20, XS, STD, XXS, SCH60, SCH140, SCH80, SCH80, SCH5, SCH40S, SCH40, SCH120, SCH10S, SCH10, SCH30, SCH160
Length	Standard & Cut length , Single Random, Double Random Pipe
Finish	AP (Annealed & Pickled), BA (Bright & Annealed), NO.1, 2B, Polished, MF, HL, NO.4, Mirror finish, BA, 8K etc
End	Plain End, Beveled End, Treaded Pipe, Screwed ends
Form	Hydraulic, Rectangular, Coiled, Square, Hollow, Round, Straight Pipes/tubes, "U" Shape, Pan Cake Coils, Boiler, LSAWetc.
Application	Dairy Pipe, Oil Pipe/tube, Gas Pipe/tube, Fluid Pipe/tube, Boiler Tube, Heat exchanger Tube
Type	Seamless /ERW/ EFW / Welded / Fabricated /CDW /DOM/CEW Inconel 718 Pipe
Marking	Heat No. (Or as per need.), Thickness, OD, Grade, Standard Length

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ASME SB 163 Inconel 718 Tube Chemical composition

Element	Min	Max
C	-	0.08
Si	-	0.35
Mn	-	0.35
P	-	0.015
Al	0.2	0.8
B	-	0.6
Co	-	1
Cr	17	21
Cu	-	0.3
Fe	Balance
Mo	2.8	3.3
Nb	4.75	5.5
Ni	50	55
Ti	0.65	1.15

 

din 2.4668 Weldability and Processability

Compared to many other high-performance nickel-based alloys (such as Inconel 625), a significant advantage of 718 alloy is that it is reinforced with niobium rather than aluminum and titanium (although it also contains niobium, but in lower proportions). This makes it less sensitive to strain-age cracking during welding and provides excellent weldability, which is crucial for manufacturing complex tubular structures.

 

astm inconel 718 Piercing and Extrusion (Hot Extrusion)

This is a common method for manufacturing thick-walled tube billets. After piercing, a heated alloy billet is extruded through a die under tremendous pressure into a hollow tube billet. This process breaks up the as-cast structure and creates more uniform fiber flow lines.

 

718 nickel Cold Rolling

To achieve high dimensional accuracy, a smooth surface, and higher strength, the hot-worked tube billet is cold worked. Cold rolling (such as pilger rolling) and cold drawing are performed at room temperature, further strengthening the material through intense plastic deformation (work hardening). The entire process requires multiple intermediate annealing treatments to eliminate internal stresses and restore the material's plasticity for subsequent processing.

inconel 718 for sale Finishing and Heat Treatment

Solution Treatment: The pipe is heated to a high temperature (typically around 980°C) to dissolve the strengthening phase into the matrix. It is then rapidly cooled (quenched) to produce a supersaturated solid solution, preparing for subsequent aging strengthening.

 

Aging Treatment: A two-stage aging process is performed at a specific temperature (approximately 720°C for 8 hours, furnace-cooled to 620°C for 8 hours, and finally air-cooled). This is the most critical step, promoting the uniform and dispersed precipitation of the γ' and γ' strengthening phases from the supersaturated solid solution, thereby achieving peak strength.

 

Non-destructive Testing (NDT): To ensure absolute reliability, finished pipes undergo rigorous non-destructive testing, including eddy current testing, ultrasonic testing, and pressure testing, to ensure the absence of any internal or surface defects.

 

Nickel Alloy 718 seamless Tube Tolerances

O.D. INCHES	WALL THICKNESS INCHES	O.D. +/- INCHES
1/2" to 1" incl.	.025 to .065	0.005
	Over .065 to .134	0.01
1 to 1-1/2" incl.	.025 to .065	0.008
	Over .065 to .134	0.01
1-1/2" to 2" incl.	.025 to .049	0.01
	Over .049 to .083	0.011
	Over .083 to .148	0.012
2" to 2-1/2" incl.	.032 to .065	0.012
	Over .065 to .109	0.013
	Over .109 to .165	0.014
2-1/2" to 3-1/2" incl.	.032 to .165	0.014
	Over .165 to .220	0.02
3-1/2" to 5" incl.	.083 to .165	0.02
	Over .165 to .220	0.025

 

Ranging In Size From Astm B163 Alloy 718 Welded Pipe

Pipe WT	ASME SB163 Alloy 718 Pipe OD	Sch	in.0	Kg/m
mm	mm
1.065	13.072	10S	1/4	0.05
2.024	13.072	40S	1/4	0.064
3.002	13.072	80S	1/4	0.081
1.065	17.015	10S	3/8	0.064
2.031	17.015	40S	3/8	0.086
3.02	17.015	80S	3/8	1.012
2.011	21.034	10S	1/2	1.002
2.077	21.034	40S	1/2	1.029
3.073	21.034	80S	1/2	1.065
2.011	26.067	10S	3/4	1.03
2.087	26.067	40S	3/4	1.071
3.091	26.067	80S	3/4	2.023
2.077	33.04	10S	1	2.013
3.038	33.04	40S	1	2.054
4.055	33.04	80S	1	3.029
6.0352)	33.04	160	1	4.03
2.077	42.016	10S	1 1/4	2.073
3.056	42.016	40S	1 1/4	3.044
4.085	42.016	80S	1 1/4	4.053
6.0352)	42.016	160	1 1/4	5.069
2.077	48.026	10S	1 1/2	3.016
3.068	48.026	40S	1 1/2	4.011
5.008	48.026	80S	1 1/2	5.049
2.077	60.033	10S	2	3.099
3.091	60.033	40S	2	5.052
5.054	60.033	80S	2	7.06
8.0742)	60.033	160	2	11.029
3.005	73.003	10S	2 1/2	5.035
5.016	73.003	40S	2 1/2	8.077
7.001	73.003	80S	2 1/2	11.059
3.005	88.09	10S	3	6.056
5.049	88.09	40S	3	11.047
7.062	88.09	80S	3	15.051
11.0132)	88.09	160	3	21.067
3.005	101.06	10S	3 1/3	7.053
5.074	101.06	40S	3 1/3	13.078
8.008	101.06	80S	3 1/3	18.092
3.005	114.03	10S	4	8.05
6.002	114.03	40S	4	16.032
8.056	114.03	80S	4	22.067
13.0492)	114.03	160	4	34.005
6.055	141.03	40S	5	22.01
9.053	141.03	80S	5	31.044
15.0882)	141.03	160	5	49.087
3.04	168.028	10S	6	14.004
7.011	168.028	40S	6	28.069
10.097	168.028	80S	6	43.021
14.027	168.028	120	6	54.075
18.0262)	168.028	160	6	68.059
8.018	219.008	40S	8	43.02
12.07	219.008	80S	8	65.063
18.023	219.008	120	8	91.03
23.0012)	219.008	160	8	112.097

 

 

 

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