- 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 |
