Nickel Alloy 718 | Zhonghe

Nickel Alloy 718

Alloy 718 (UNS N07718/W.Nr. 2.4668) is a high-strength, corrosion-resistant nickel-chromium material used at -423° to 1300°F.

The age-hardenable alloy can be readily fabricated, even into complex parts. Its welding characteristics, especially its resistance to post-weld cracking, are outstanding.

The ease and economy with which INCONEL alloy 718 can be fabricated, combined with good tensile, fatigue, creep, and rupture strength, have resulted in its use in a wide range of applications. Examples of these are components for liquid-fueled rockets, rings, casings, and various formed sheet metal parts for aircraft and land-based gas turbine engines, and cryogenic tankage. It is also used for fasteners and instrumentation parts.

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Nickel Alloy 718

Alloy 718 (UNS N07718/W.Nr. 2.4668) composition limits are shown in the table below:

Weight % C Mn P S Si Cr Ni Mo Cb Ta Ti Al Co B Cu Fe
Alloy 718
 0.08 0.35 0.015 0.015 0.35 17-21 50-55 2.8-3.30 4.75-5.50 0.05 0.65-1.15 0.20-0.80 1.00 0.006 0.30 Rem

Typical Mechanical Properties of Alloy 718 Bar above and Alloy 718 Sheet below.

Material Condition Tensile Strength
ksi		 Yield Strength
ksi		 Elongation
4D		 Hardness
Alloy 718 Sheet AMS 5596 < 0.1874″ thick 140 80 30 102 HRB
Alloy 718 Sheet AMS 5596 Aged < 0.1874″ thick 180 150 12 ≥36 HRC
Alloy 718 Sheet AMS 5597 140 75 30 ≤ 25 HRC
Alloy 718 Sheet AMS 5597 + Aged 180 150 15 ≥38 HRC

CORROSION RESISTANCE

INCONEL alloy 718 has excellent corrosion resistance to many media. This resistance, which is similar to that of other nickel-chromium alloys, is a function of its composition. Nickel contributes to corrosion resistance in many inorganic and organic, other than strongly oxidizing, compounds throughout wide ranges of acidity and alkalinity. It also is useful in combating chloride-ion stress-corrosion cracking. Chromium imparts an ability to withstand attacks by oxidizing media and sulfur compounds. Molybdenum is known to contribute to resistance to pitting in many media.

AVAILABLE PRODUCTS AND SPECIFICATIONS

INCONEL alloy 718 is designated at UNS N07718, UNS N07719, and Werkstoff Nr. 2.4668. It is listed in NACE MR01-75 for oil and gas service. Alloy 718 is available as pipe, tube, sheet, strip, plate, round bar, flat bar, forging stock, hexagon, wire and extruded section.

Rod, Bar, Wire and Forging Stock – ASTM B 637, ASME SB 637, SAE AMS 5662, SAE AMS 5663, SAE AMS 5664, SAE AMS 5832, SAE AMS 5914, SAE AMS 5962, ASME Code Case 1993, ASME Code Case 2206, ASME Code Case 2222, AECMA PrEN 2404, AECMA PrEN 2405, AECMA PrEN 2952, AECMA PrEN 2961, AECMA PrEN 3219, AECMA PrEN 3666, ISO 9723, ISO 9724, ISO 9725, DIN 17752-17754

Plate, Sheet and Strip – ASTM B 670, ASTM B 906, ASME SB 670, ASME SB 906, SAE AMS 5596, SAE AMS 5597, SAE AMS 5950, AECMA PrEN 2407, AECMA PrEN 2408, ISO 6208, DIN 17750

Pipe and Tube – SAE AMS 5589, SAE AMS 5590, ASME Code Case N-253, DIN 17751

Welding Product – INCONEL Filler Metal 718 – AWS 5.14 / ERNiFeCr-2 Others – ASME Code Case N-62, ASME Code Case N208, DIN 17744

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