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7/22/2019 Steel_17-4PH_mmpds
1/18
MMPDS-04
1 April 2008
2-200
2.6.9 17-4PH
2.6.9.0 Comments and Properties Alloy 17-4PH is a precipitation-hardening, martensiticstainless steel used for parts requiring high strength and good corrosion and oxidation resistance up to 600(F.
The alloy is available in all product forms.
Manufacturing Considerations 17-4PH is readily forged, machined, welded, and brazed. Machining
requires the same precautions as the austenitic stainless steels except that work-hardening is not a problem.
Best machinability is exhibited by Conditions H1150 and H1150M. A dimensional contraction of 0.0004 to
0.0006 and 0.0008 to 0.0010 in./in. occurs upon hardening to the H900 and H1150 conditions, respectively.
This fact should be considered before finish machining prior to aging treatment.
When permanent deformation is performed, such as cold-straightening of hardened parts, reaging is
recommended to minimize internal stresses.
Alloy 17-4PH can be fusion welded with any of the normal processes using 17-4PH filler metal without
preheat. For details up to inch thickness, Condition A is satisfactory prior to welding, but for heavy sections,an overaged condition (H1150) is recommended to preclude cracking. After welding, weldments should be
aged or solution-treated and aged.
Alloy 17-4PH castings are produced in sand molds, investment molds, and by centrifugal casting.
While 17-4PH has good castability, it is subject to hot-tearing, so heavy X or T sections, sharp corners, and
abrupt changes in section size should be avoided. Alloy 17-4PH castings are susceptible to microshrinkage,
which will decrease the ductility but have no effect on the yield or ultimate strength. During heat treatment,
care must be exercised to avoid carbon or nitrogen contamination from furnace atmospheres. Combusted
hydrocarbon and dissociated ammonia atmospheres have been sources of contamination. Air is commonly used
and both vacuum and dry argon are effective for minimizing scaling. Oxides formed during solution treating
in air may be removed by grit blasting or abrasive tumbling.
Alloy 17-4PH can be heat treated to develop a wide range of properties. Heat-treatment procedures
are specified in applicable material specifications and AMS-H-6875.
Design and Environmental Considerations For tensile applications where stress corrosion is a
possibility, 17-4PH should be aged at the highest temperature compatible with strength requirements and at a
temperature not lower than 1025(F for 4 hours minimum.
The impact strength of 17-4PH, especially large size bar in the H900 and H925 conditions, may be very
low at subzero temperatures; consequently, the use of 17-4PH for critical applications at low temperatures
should be avoided. For nonimpact applications, such as valve seats, parts in the H925 condition have performed
satisfactorily down to -320(F. The H1100 and H1150 conditions have improved impact strength so that parts
made from small-diameter bar can be used down to -100(F with low risk. For critical low- temperatureapplications, a similar alloy, 15-5PH (consumable electrode vacuum melted), should be used instead of 17-4PH
because of its superior impact strength at low temperature.
Specifications and Properties Material specifications for 17-4PH are presented in Table 2.6.9.0(a).
Room temperature mechanical and physical properties for various conditions of 17-4PH products are presented
in Tables 2.6.9.0(b) through 2.6.9.0(f). The physical properties of this alloy at room and elevated temperatures
are presented in Figure 2.6.9.0.
7/22/2019 Steel_17-4PH_mmpds
2/18
MMPDS-04
1 April 2008
2-201
Table 2.6.9.0(a). Material Specifications for 17-4PH Stainless Steel
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p
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7/22/2019 Steel_17-4PH_mmpds
3/18
MMPDS-04
1 April 2008
2-202
Table 2.6.9.0(b). Design Mechanical and Physical Properties of 17-4PH Stainless SteelSheet, Strip, and Plate
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Table 2.6.9.0(c). Minimum Elongation Values for 17-4PH Sheet, Strip, and Plate
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h
0
0
.
.
1
1
8
8
6
6
0
0
.
.
1
1
8
8
7
7
t
t
h
h
r
r
o
o
u
u
g
g
h
h
0
0
.
.
6
6
2
2
5
5
0
0.
.
6
62
26
6
t
th
hr
r
o
o
u
u
g
gh
h
4
4.
.
0
00
00
0
5
5
8
8
1
10
0
5
5
8
8
1
10
0
5
5
8
8
1
12
2
5
5
9
9
1
13
3
5
5
1
1
0
0
1
14
4
8
8
1
1
0
0
1
16
6
7/22/2019 Steel_17-4PH_mmpds
4/18
MMPDS-04
1 April 2008
2-203
Table 2.6.9.0(d). Design Mechanical and Physical Properties of 17-4PH Stainless SteelForging, Tubing, and Rings
S
S
p
p
e
e
c
c
i
i
f
f
i
i
c
c
a
a
t
t
i
i
o
o
n
n
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
A
A
M
M
S
S
5
5
6
6
4
4
3
3
F
F
o
o
r
r
m
m
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
F
F
o
o
r
r
g
g
i
i
n
n
g
g
,
,
t
t
u
u
b
b
i
i
n
n
g
g
,
,
a
a
n
n
d
d
r
r
i
i
n
n
g
g
s
s
C
C
o
o
n
n
d
d
i
i
t
t
i
i
o
o
n
n
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
H
H
9
9
0
0
0
0
H
H
9
9
2
2
5
5
H
H
1
1
0
0
2
2
5
5
H
H
1
1
0
0
7
7
5
5
H
H
1
1
1
1
0
0
0
0
H
H
1
1
1
1
5
5
0
0
H
H
1
1
1
1
5
5
0
0
M
Maa
T
T
h
h
i
i
c
c
k
k
n
n
e
e
s
s
s
s
,
,
i
i
n
n
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
