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.

CHEMICAL COMPOSITION

WEIGHT% C SI MN S P CR NI MO NB+TA CU TI AL
MIN.  17,00  50,00  2,80  4,75  0,65  0,20
MAX.  0,08  0,35  0,35 0,015  0,015  21,00  55,00  3,30  5,50  0,30  1,05  0,80

Product Standards: ASTM B637, EN 17752, AMS 5662

APPLICATIONS

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

Mechanical Properties

YIELD STRENGTH
RP0.2
MPA
TENSILE STRENGTH
RM
MPA
ELONGATION
[%]
HARDNESS
[HB]
IMPACT
CHARPY-V, -101ºC
[J]
 725 – 1000  895 – 1250  ≥ 30  248 – 363  ≥ 27

Heat Treatment

Solution annealed at 1000 – 1052°C. Age hardening at 774 – 802°C.

Weldability

Very good.

ALLOY 718 / UNS N07718 ROUND BAR

DESCRIPTION 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