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18 % nickel-cobalt-molybdenum maraging steel for forging stock

1800 MPa: double vacuum melted

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  • UNS Number - BS S162: 1990
  • Specification - BS S162
  • Form - Forgings, bars and parts

General Information

This British Standard specifies the chemical composition, mechanical properties and inspection and test requirements for an 18 % nickel-cobalt-molybdenum maraging steel (iron base, Ni 18, Co 7.75, Mo 4.9) supplied in the following forms and as parts for general aerospace use:
a) forging stock, designation S 162A, columns 2 and 3 of Table 1;
b) forgings, designation S 162C, columns 4, 5 and 6 of Table 1;
c) black bars for machining, designation S 162B, columns 7, 8 and 9 of Table 1;
d) bright bars for machining, designation S 162D, columns 10, 11 and 12 of Table 1.

Mechanical Properties

Property Min Value Max Value
N/mmsq 0.2% Yield Strength 0 0
N/mmsq Ultimate Tensile Strength 1800 2000
% Elongation 8 0
% Reduction of Area 40 0
Hardness Rockwell B (HRB) 0 0
Hardness Rockwell C (HRC) 0 0
Hardness Brinell (BHN) 0 0
Hardness Vickers (HV) 520 620

Chemical Elements

% Carbon (C) 0 0.010
% Chromium (Cr) 0 0.25
% Manganese (Mn) 0 0.10
% Molybdenum (Mo) 4.6 5.2
% Nickel (Ni) 17.0 19.0
% Phosphorus (P) 0 0.010
% Sulphur (S) 0 0.010
% Silicon (Si) 0 0.10
% Iron (Fe) 65.98 71.05
% Copper 0 0
% Magnesium 0 0
% Zinc 0 0
% Titanium 0.30 0.60
% Aluminium 0.05 0.15
% Cobalt (Co) 7.0 8.5
% Zirconium (Zr) 0 0.02
% Boron (B) 0 0.005
% Lead (Pb) 0 0
% Bismuth (Bi) 0 0
% Selenium (Se) 0 0