N07718 Inconel Alloy Seamless Pipe Inconel 718 W.Nr.2.4668 NiCr19Fe19Nb5
Inconel 718 ( N07718 ) Superalloy Seamless Pipe W.Nr.2.4668 / NiCr19Fe19Nb5
Material designation: Inconel 718 nickel-based alloy
US grade: N07718
German grade: W.Nr.2.4668 / NiCr19Fe19Nb5
French grade: Nc19FeNb
I. Overview of Inconel 718 (N07718) nickel-based alloy:
Inconel 718 alloy is a nickel-based superalloy reinforced by γ "phase center-centered γ" and face-centered cubic γ ′ phase precipitation. It has good comprehensive performance in the temperature range of -253 ～ 700 ℃, and the yield strength below 650 ℃ is at high deformation temperature. The alloy is the first, and has good fatigue resistance, radiation resistance, oxidation resistance, corrosion resistance, as well as good processability, welding performance and long-term structural stability. It can manufacture various parts with complex shapes in aerospace, nuclear energy, In the petroleum industry, it has been used in a wide range of temperatures.
Another feature of the alloy is that the alloy structure is particularly sensitive to hot working processes. Mastering the phase precipitation and dissolution in the alloy and the interrelationship between the structure and the process and performance, it is possible to formulate reasonable and feasible technological procedures for different application requirements. Can obtain a variety of parts that can meet different strength levels and use requirements. The varieties supplied include forgings, forging rods, rolled rods, cold-rolled rods, round cakes, ring pieces, plates, strips, wires, tubes and so on. It can be made into parts such as disks, rings, blades, shafts, fasteners and elastic elements, sheet structural parts, casings, etc. for long-term use in aviation.
The chemical composition of this alloy is divided into 3 categories: standard composition, high-quality composition, and high-purity composition, see Table 1-1. The high-quality ingredients reduce carbon and increase niobium on the basis of standard ingredients, thereby reducing the amount of niobium carbide, reducing fatigue sources and increasing the number of strengthening phases, and improving fatigue resistance and material strength. At the same time reduce harmful impurities and gas content. High-purity ingredients reduce the content of sulfur and harmful impurities on the basis of high-quality standards, and improve the purity and comprehensive performance of materials.
Inconel718 alloy for nuclear energy applications needs to control the boron content (the other element composition is unchanged), and the specific content is determined by the supplier and the buyer through consultation. When ω (B) ≤ 0.002%, it is distinguished from the Inconel718 alloy used in the aerospace industry, and the alloy grade is Inconel718A.
Table1-1 %
| type | C | Cr | Ni | Co | Mo | Al | Ti | Fe |
| normal | ≤0.08 | 17.0~21.0 | 50.0~55.0 | ≤1.0 | 2.80~3.30 | 0.30~0.70 | 0.75~1.15 | Balance |
| high- grade | 0.02~0.06 | 17.0~21.0 | 50.0~55.0 | ≤1.0 | 2.80~3.30 | 0.30~0.70 | 0.75~1.15 | Balance |
| High- purity | 0.02~0.06 | 17.0~21.0 | 50.0~55.0 | ≤1.0 | 2.80~3.30 | 0.30~0.70 | 0.75~1.15 | Balance |
| type | Nb | B | Mg | Mn | Si | P | S | Cu | Ca |
| ≤ |
| normal | 4.75~5.50 | 0.006 | 0.01 | 0.35 | 0.35 | 0.015 | 0.015 | 0.30 | 0.01 |
| high- grade | 5.00~5.50 | 0.006 | 0.01 | 0.35 | 0.35 | 0.015 | 0.015 | 0.30 | 0.01 |
| High- purity | 5.00~5.50 | 0.006 | 0.005 | 0.35 | 0.35 | 0.015 | 0.002 | 0.30 | 0.005 |
| type | Bi | Sn | Pb | Ag | Se | Te | Tl | N | O |
| ≤ | |
| normal | --- | --- | 0.0005 | --- | 0.0003 | --- | --- | --- | --- |
| high- grade | 0.001 | 0.005 | 0.001 | 0.001 | 0.0003 | --- | --- | 0.01 | 0.01 |
| High- purity | 0.00003 | 0.005 | 0.001 | 0.001 | 0.0003 | 0.00005 | 0.0001 | 0.01 | 0.005 |
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N07718 Inconel Alloy Seamless Pipe Inconel 718 W.Nr.2.4668 NiCr19Fe19Nb5 Images
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