Inconel Alloy 718 Pipe

Inconel 718 (UNS N07718) is a precipitation-hardening nickel-chromium-based high-temperature alloy. It has become an irreplaceable pipe solution in the aerospace, energy and chemical industries. Through the γ″ phase (Ni₃Nb) strengthening mechanism, it maintains an excellent balance of high strength, creep resistance and corrosion resistance in the extreme temperature range of -253℃ to 705℃, becoming the core material of key systems.

Inconel 718 Pipe & Tube Manufacturer, supplier

HT PIPE is a leading stockist and global exporter with over 15 years of expertise in international trade. We supply pipes, plates, round bars, and a comprehensive range of pipe fittings, flanges, and valves. Contact us now for free quotes and personalized product information.

 

nickel alloy 718 Chemical composition

Nickel (50-55%) is the matrix, chromium (17-21%) imparts oxidation resistance, niobium + tantalum (5.0-5.5%) forms the main strengthening phase γ″, molybdenum (2.8-3.3%) improves creep resistance, and aluminum + titanium (0.65-1.15%) assists in the formation of γ′ phase (Ni₃(Al,Ti)).

Standards 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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in718 Mechanical Properties

Temper	Solution-treated
Tensile Rm	155	ksi (Max)
Tensile Rm	1069	MPa (Max)
R.p. 0.2% Yield	95	ksi (Max)
R.p. 0.2% Yield	655	MPa (Max)
Elongation (2" or 4D gl)	30	% (min)

 

718 nickel Physical Properties (Room Temperature)

Specific Heat (0-100°C)	435	J.kg-1.°K-1
Thermal Conductivity	11.4	W.m -1.°K-1
Thermal Expansion	13	μm/μm/°C
Modulus Elasticity	200	GPa
Electrical Resistivity	1.32	Ohm-cm
Density	8.19	g/cm3

 

Corrosion resistance of alloy 718 tube 

din 2.4668 High temperature oxidation resistance

Inconel 718 pipes can form a dense Cr₂O₃ oxide film in air ≤900℃, with an oxidation rate as low as <0.1 mm/year (based on 900℃ measured data), and have excellent high temperature stability, its short-term tolerance is more outstanding, and it can withstand 1200℃ oxygen-rich gas flushing (such as extreme conditions in aircraft engine combustion chambers), meeting high temperature service requirements.

forging inconel 718 Acidic medium tolerance

The alloy performs well in a strong reducing acid environment: the corrosion rate in 15% boiling hydrochloric acid is <0.5 mm/year (316L stainless steel will perforate and fail in this environment), the corrosion rate in 50% sulfuric acid at 80℃ is <0.13 mm/year (316L＞1.5 mm/year); the corrosion rate in boiling 85% phosphoric acid is reduced to <0.03 mm/year (316L>0.15 mm/year).

incoloy 718 Alkaline environment stability

Under alkaline conditions, Inconel 718 shows comprehensive protection capabilities: the corrosion rate in 50% sodium hydroxide solution at 100°C is <0.02 mm/year, at the same time, it can resist the erosion of molten alkali metals (such as sodium/potassium alloy circulation systems), solve the problem of high-temperature alkali embrittlement, and expand its application boundaries in nuclear energy and special chemical equipment.

inconel x718 Hot extrusion

The ingot is preheated to 1120℃, and extruded into a rough tube with glass lubricant protection, and the grain size is controlled ≤ASTM grade.

 

unsn07718 Cold rolling sizing

Multiple cold rolling with intermediate annealing (980℃/water quenching) to achieve Φ6-300 mm precision thin-walled tube (tolerance ±0.05 mm).

 

Weight Table ASME SB163 Alloy 718 Seamless Tube

Avarage Wall inches	Outside Diameter inches	Internal Area (in2)	Inside Diameter inches	D/t Ratio	Tube Cross Sectional Area (in2)
0.002	0.025	0.00346	0.021	12.05	0.00145
0.0028	0.025	0.00296	0.0194	8.093	0.00195
0.0035	0.025	0.00254	0.018	7.014	0.00236
0.0049	0.025	0.00181	0.0152	5.01	0.00309
0.0065	0.025	0.00113	0.012	3.085	0.00378
0.002	0.0375	0.00881	0.0335	18.075	0.00223
0.0028	0.0375	0.00799	0.0319	13.039	0.00305
0.0035	0.0375	0.00731	0.0305	10.071	0.00374
0.0049	0.0375	0.00603	0.0277	7.065	0.00502
0.0065	0.0375	0.00471	0.0245	5.077	0.00633
0.002	0.05	0.01662	0.046	25	0.00302
0.0028	0.05	0.01548	0.0444	17.086	0.00415
0.0035	0.05	0.01452	0.043	14.029	0.00511
0.0049	0.05	0.01213	0.0402	10.02	0.00694
0.0065	0.05	0.01075	0.037	7.069	0.00888
0.0083	0.05	0.00876	0.0334	6.002	0.01087
0.002	0.0625	0.02688	0.0585	31.025	0.0038
0.0028	0.0625	0.02543	0.0569	22.032	0.00525
0.0035	0.0625	0.02419	0.0555	17.086	0.00649
0.0049	0.0625	0.02181	0.0527	12.076	0.00887
0.0065	0.0625	0.01924	0.0495	9.062	0.01144
0.0083	0.0625	0.01655	0.0459	7.053	0.01413
0.0095	0.0625	0.01486	0.0435	6.058	0.01582
0.0109	0.0625	0.01301	0.0407	5.073	0.01767
0.0028	0.075	0.03783	0.0694	26.079	0.00635
0.0035	0.075	0.03632	0.068	21.043	0.00786
0.0049	0.075	0.03339	0.0652	15.031	0.01079
0.0065	0.075	0.03019	0.062	11.054	0.01399
0.0083	0.075	0.02679	0.0584	9.004	0.01739
0.0095	0.075	0.02463	0.056	7.089	0.01955
0.0109	0.075	0.02223	0.0532	6.088	0.02195
0.012	0.075	0.02043	0.051	6.025	0.02375
0.002	0.0875	0.05476	0.0835	43.075	0.00537
0.0028	0.0875	0.05268	0.0819	31.025	0.00745
0.0035	0.0875	0.0509	0.0805	25	0.00924
0.0049	0.0875	0.04742	0.0777	17.086	0.01272
0.0065	0.0875	0.04359	0.0745	13.046	0.01654
0.0083	0.0875	0.03948	0.0709	10.054	0.02065
0.0095	0.0875	0.03685	0.0685	9.021	0.02328
0.0109	0.0875	0.0339	0.0657	8.003	0.02623
0.012	0.0875	0.031617	0.0635	7.029	0.02846
0.0028	1	0.06999	0.0944	35.071	0.00855
0.0035	1	0.06793	0.093	28.057	0.01061
0.0049	1	0.0639	0.0902	20.041	0.01464
0.0065	1	0.05945	0.087	15.038	0.01909
0.0083	1	0.05463	0.0834	12.005	0.02391
0.0095	1	0.05153	0.081	10.053	0.02701
0.0109	1	0.04803	0.0782	9.017	0.03051
0.012	1	0.04536	0.076	8.033	0.03318
0.0134	1	0.04208	0.0732	7.046	0.03646
0.0035	1.025	1.00936	1.018	35.071	0.01336
0.0049	1.025	1.00423	1.0152	25.051	0.01849
0.0065	1.025	0.09852	1.012	19.023	0.0242
0.0083	1.025	0.09229	1.0084	15.006	0.0316L3
0.0095	1.025	0.08825	1.006	13.016	0.03447
0.0109	1.025	0.08365	1.0032	11.047	0.03907
0.012	1.025	0.08012	1.001	10.042	0.0426
0.0134	1.025	0.07574	0.0982	9.033	0.04698
0.0035	1.05	1.06061	1.043	42.086	0.01611
0.0049	1.05	1.05438	1.0402	30.061	0.02234
0.0065	1.05	1.04741	1.037	23.008	0.0293
0.0083	1.05	1.03977	1.0334	18.007	0.03695
0.0095	1.05	1.03478	1.031	15.079	0.04193
0.0109	1.05	1.02908	1.0282	13.076	0.04763
0.012	1.05	1.02469	1.026	12.05	0.05202
0.0134	1.05	1.01921	1.0232	11.019	0.0575
0.0148	1.05	1.01385	1.0204	10.014	0.06286
0.0035	1.075	2.02167	1.068	50	0.01886
0.0049	1.075	2.08413	1.0902	40.082	0.03003
0.0065	1.075	2.00612	1.062	26.092	0.03441
0.0083	1.075	1.09706	1.0584	21.008	0.04347
0.0095	1.075	1.09113	1.056	18.042	0.04939
0.0109	1.075	1.08433	1.0532	16.006	0.05619
0.012	1.075	1.07908	1.051	14.058	0.06145
0.0134	1.075	1.0725	1.0482	13.006	0.06803
0.0148	1.075	1.06604	1.0454	11.082	0.07449
0.0165	1.075	1.05837	1.042	10.061	0.08216
0.0035	2	2.09255	1.093	57.014	0.02161
0.0049	2	2.08413	1.0902	40.082	0.03003
0.0065	2	2.07465	1.087	30.077	0.03951
0.0083	2	2.06417	1.0834	24.01	0.04999
0.0095	2	2.0573	1.081	21.005	0.05685
0.0109	2	2.04941	1.0782	18.035	0.06475
0.012	2	2.04328	1.076	16.067	0.07087
0.0134	2	2.03561	1.0732	14.093	0.07855
0.0148	2	2.02805	1.0704	13.051	0.08611
0.0165	2	2.01904	1.067	12.012	0.09512

 

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

 

Nickel Alloy 718 Welded 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

 

 

 

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