NDT Solution

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NDT of Precipitation Hardened Steels Using
Fluorescent Magnetic Particle Testing

Table 1

 

Table 1  Typical properties of precipitation hardened streets

Precipitation
Hardened Steels

Carbon

Chromium

Nickel

 Molybdenum Other Elements Ultimate Tensile Strength Hardness
15-5 Martensitic 0.07% 15.0% 4.0% - 2.5 to 44.5% copper
0.30 cadmium
and tantalum

1030 MPa
(150 000 lb/in.2)

 38 Rc
17-4 Martensitic 0.07% 17.0% 4.0% - 4.0% copper, 0.15
to 0.45 cadmium
and tantalum

1380 MPa
(200 000 lb/in.2)

 44 Rc
13-8 Semiaustenitic 0.05% 13.0% 8.0% 2.3%

1380 MPa
(200 000 lb/in.2)

 45 Rc
17-7 Semiaustenitic 0.09% 17.0% 7.0% - 1.0% aluminum

8960 MPa
(1 300 000 lb/in.2)

 85 Rc

[ Back to December '03 NDT Solution ]

 

Table 2  Properties of 17-4 precipitation hardened steel

Condition

Tensile Strength

Hardness

Permeability at 8 kA/m
(100 Oe)

 Permeability at 16 kA/m
(200 Oe)		 Permeability
at Saturation

A

1100 MPa
(160 000 lb/in.2)

 35 Rc 74 48 95

H900

1450 MPa
(210 000 lb/in.2)

 45 Rc 90 56 135

H925

1380 MPa
(200 000 lb/in.2)

 43 Rc - - -

H1025

1280 MPa
(185 000 lb/in.2)

 38 Rc - - -

H1075

1210 MPa
(175 000 lb/in.2)

 37 Rc 88 52 136

H1150

1100 MPa
(160 000 lb/in.2)

 35 Rc 59 136 71

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