Nickel-chromium alloy Inconel 718 precipitation hardening welded steel pipe detailed explanation
Inconel 718 welded pipe is a precipitation-hardening nickel-chromium alloy known for its exceptional high-temperature strength (up to 704°C or 1300°F), high yield and tensile strength, and excellent resistance to creep and corrosion. Its niobium and titanium contents provide good weldability and resistance to autogenous hardening during welding, making it an ideal choice for aerospace, gas turbine, and other high-stress applications.
What is precipitation hardening in INCONEL 718?
Precipitation hardening in Inconel 718 is achieved through aging heat treatment, which forms two primary strengthening phases within the alloy: γ″ (Ni₃Nb): the primary strengthening phase that provides high-temperature strength. γ′ (Ni₃(Al,Ti)): a secondary strengthening phase that enhances overall properties.
Comparing 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 |
718 Inconel precipitation hardening welded steel pipe Chemical Composition
| Grade | C | Mn | Si | Fe | S | Cr | Al | Ni | |
| 718 | min. | – | – | – | bal | – | 17.0 | 0.2 | 50.0 |
| max. | 0.08 | 0.35 | 0.35 | bal | 0.01 | 21.0 | 0.8 | 55.0 | |
Inconel Alloy 718 precipitation hardening welded steel pipe Mechanical Properties
| Element | Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 718 | 8.14 g/cm3 | 1400 °C (2550 °F) | Psi – 80,000 , MPa – 550 | Psi – 32,000 , MPa – 220 | 30 % |
Ranging in size from Inconel 718 precipitation hardening welded steel pipe
|
Pipe WT |
ASME SB163 Alloy 718 Pipe OD |
Sch |
in.0 |
Kg/m |
|---|---|---|---|---|
|
1.065 |
13.072 |
10S |
1/4 |
0.050 |
|
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 |
|
3.020 |
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 |
1.030 |
|
2.087 |
26.067 |
40S |
3/4 |
1.071 |
|
3.091 |
26.067 |
80S |
3/4 |
2.023 |
|
2.077 |
33.040 |
10S |
1 |
2.013 |
|
3.038 |
33.040 |
40S |
1 |
2.054 |
|
4.055 |
33.040 |
80S |
1 |
3.029 |
|
6.0352) |
33.040 |
160 |
1 |
4.030 |
|
2.077 |
42.016 |
10S |
1¼ |
2.073 |
|
3.056 |
42.016 |
40S |
1¼ |
3.044 |
|
4.085 |
42.016 |
80S |
1¼ |
4.053 |
|
6.0352) |
42.016 |
160 |
1¼ |
5.069 |
|
2.077 |
48.026 |
10S |
1½ |
3.016 |
|
3.068 |
48.026 |
40S |
1½ |
4.011 |
|
5.008 |
48.026 |
80S |
1½ |
5.049 |
|
2.077 |
60.033 |
10S |
2 |
3.099 |
|
3.091 |
60.033 |
40S |
2 |
5.052 |
|
5.054 |
60.033 |
80S |
2 |
7.060 |
|
8.0742) |
60.033 |
160 |
2 |
11.029 |
|
3.005 |
73.003 |
10S |
2½ |
5.035 |
|
5.016 |
73.003 |
40S |
2½ |
8.077 |
|
7.001 |
73.003 |
80S |
2½ |
11.059 |
Gnee Steel specializes in the production and sale of various nickel-based alloys, including Nickel 201, Nickel 202, Hastelloy C-276, Hastelloy C-22, Hastelloy B, Hastelloy C-4, Inconel Alloy 600, Inconel 625, Inconel 718, Inconel X-750, Incoloy Alloy 800, Incoloy 800H/HT, Incoloy 825, Monel Alloy 400, Monel K500, and high-temperature alloys. Gnee Steel's products are widely used in aerospace, chemical, electric power, automotive, and nuclear energy applications, and we can provide customized alloy solutions tailored to customer needs. For alloy pricing inquiries or customized alloy solutions, please contact us for a quote at ss@gneemetal.com.
