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Chromium-nickel-copper-molybdenum corrosion resisting steel

1270 MPa to 1470 MPa

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  • UNS Number - BS 3S145 : 1996
  • Specification - BS S145
  • Form - billets, bars, forgings and parts

General Information

This British Standard specifies characteristics of a
chromium-nickel-copper-molybdenum corrosion
resisting steel supplied in the following forms, and as
parts, for general aerospace use:
a) forging stock and billets and bars for
subsequent working: softened, designation S145A;
b) forgings: solution treated, designation S145C;
c) forgings: solution treated and precipitated,
designation S145G;
d) black bar for machining: solution treated,
designation S145B;
e) black bar for machining: solution treated and
precipitated, designation S145F;
f) bright bar for machining: solution treated,
designation S145D;
g) bright bar for machining: solution treated and
precipitated, designation S145H.

Mechanical Properties

Property Min Value Max Value
N/mmsq 0.2% Yield Strength 0 1030
N/mmsq Ultimate Tensile Strength 1270 1470
% Elongation 0 10
% Reduction of Area 0 0
Hardness Rockwell B (HRB) 0 0
Hardness Rockwell C (HRC) 0 0
Hardness Brinell (BHN) 375 429
Hardness Vickers (HV) 400 455

Chemical Elements

% Carbon (C) 0 0.07
% Chromium (Cr) 13.2 14.7
% Manganese (Mn) 0 1.00
% Molybdenum (Mo) 1.20 2.00
% Nickel (Ni) 5.0 5.8
% Phosphorus (P) 0 0.035
% Sulphur (S) 0 0.025
% Silicon (Si) 0 0.60
% Iron (Fe) 73.37 79.3
% Copper 1.20 2.00
% Magnesium 0 0
% Zinc 0 0
% Titanium 0 0
% Aluminium 0 0
% Cobalt (Co) 0 0
% Zirconium (Zr) 0 0
% Boron (B) 0 0
% Lead (Pb) 0 0
% Bismuth (Bi) 0 0
% Selenium (Se) 0 0