MATERIAL DESCRIPTION

Alloy 718 is a age-hardened nickel-chromium alloy containing also significant amounts of iron, niobium and molybdenum along with lesser amounts of aluminum and titanium. This provides a high strength alloy combined with corrosion resistance. Service temperatures range from -250°C to about 650°C. This alloy has also very good weld ability.

Applications

Used in pumps, tooling, gas turbines, rocket motors and nuclear reactors.

Heat Treatment

Solution annealed at 1021 – 1052°C. Age hardening at 774 – 802°C.

Weldability

Very good.

Chemical Composition (Spesific for Bars)

Weight  %   C Mn P S Si Cr Ni Mo Cu Nb+Ta   Co Fe   Al  Ti  B  Pb  Se  Bi
Min.            17,0  50,0   2,80    4,87   bal. 0,40 0,80        
Max.  0,045  0,35  0,010  0,010  0,35  21,0  55,0  3,30  0,23   5,20 1,00 bal. 0,60 1,15 60 ppm 10 ppm 5 ppm 0,5 ppm

 

Reference Standards

General:

  • PED 2014/68/EU Annex I section 4.3
  • NACE MR0175/ ISO 15156-3 and NACE MR0103/ ISO 17945

Bars:

  • API 6ACRA

Mechanical Properties (Specific for Bars – 120K)

Dimension (mm)

 Yield strength
Rp0.2,
MPa		 Tensile strength Rm,
MPa		 Elongation
[%]		 Hardness
[HRC]		 Impact Charpy-V, -60ºC
[J]
 < 76  827 – 1000  ≥ 1034  ≥ 20  32 – 40  ≥ 68
 76 – 254  827 – 1000  ≥ 1034  ≥ 20  32 – 40  ≥ 47
 > 254  827 – 1000  ≥ 1034  ≥ 20  32 – 40  ≥ 41

Round Bar Stock

DIA KG/M
12,7 mm 1.1
25,4 mm 4.4
31,875 mm 6.9
38,1 mm 1.
41,2 mm 11.5
45 mm 13.8
50,8 mm 18.
63,5 mm 27.5
76,2 mm 39.4
90 mm 55.1
101,6 mm 70.2
127 mm 110.
152 mm 158
165 mm 186
177,8 mm 215
203,2 mm 281
215,9 mm 289
230 mm 360
254 mm 439
304,8 mm 632

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Equivalent Standards

  • EN 2.4668
  • UNS N07718
  • Alloy 718 – 120K
Tags: Round Bar & Bored Bar