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17-4PH
Technical Data
17-4PH is a precipitation hardening martensitic stainless steel, which combines high strength and hardness (after heat treatment) wich excellent corrosion resistance, and is suitable for easy fabrication.
TYPICAL ANALYSIS
C.
Mn.
P.
S.
Si.
Cr.
Ni.
Cu.
Nb.+Ta..
0.07%
max.
1.00%
max.
0.04%
max.
0.03%
max.
1.00%
max.
15.00-
17.50%
3.00-
5.00%
3.00-
5.00%
0.15-
0.45%
Solution Treatments.
As supplied 17-4PH is usuall in the solution treated condition (Condition A). It can be heat treated at different temperatures to offer a wide range of properties. (We also hold stock in H1150+H1150, and annealed block).
Condition
Hardening
Hardening
Type of Cooling
Hardness
Temperature
Time
Brinell
Rockwell C
A
1038°C
1/2
Oil/Air (to below 32°C)
363 max.
39 max.
H900
480°C
1
Air
420
44
H925
495°C
4
Air
409
42
H1025
550°C
4
Air
352
38
H1075
580°C
4
Air
341
36
H1100
595°C
4
Air
332
35
H1150
621°C
4
Air
311
33
H1150+H1150
760°C
760°C
4
followed by
4
Air
Air
302
33
H1150-M
760°C
620°C
2
followed by
4
Air
Air
277
27
Typical Mechanical Properties (longitudinal)
Condition:
A
H900
H925
H1025
H1075
H1100
H1150
H1150+
H1150
H1150M
Tensile Strength
N/mm2
1034
1380
1310
1170
1140
1035
1000
965
860
0.2% YS
N/mm2
760
1275
1200
1140
1035
930
860
760
585
Reduction of Area
%
30-60
50
54
56
58
58
60
60
68
Elongation
%
6-15
14
14
15
16
17
19
20
22
Charpy Impact
J
-
20
34
47
54
61
68
108
135
Corrosion Resistance
17-4PH stainless steel has excellent corrosion resistance. Corrosion tests and service experience have shown that in all aged conditions it is superior to standard hardenable stainless grades such as 420, 431 and 410. Its corrosion resistance is comparable to grade 304 Stainless.
Welding
Arc and resistance welding processes used on standard grades of stainless steel are applicable to 17-4PH stainless steel. The low hardness enables sections, up to 100mm, to be welded without requiring pre heating.
Fabrication
17-4PH Condition is suitable for limited cold forming, H1100, H1150 and overaged conditions are more suitable when severe cold forming is required.
Machining
17-4PH Condition has machining characteristics similar to stainless grades 302, 304 and 410. The high hardness and strength in Condition H900 is the most difficult to machine and the material should be machined at 60% of the rate which is used for Condition A.
Nitriding
To increase the resistance to surface wear, with a slight decrease in corrosion resistance, 17-4PH stainless steel can be nitrided. An approximate hardness of 64/67HRc can be achieved, with a surface hardness depth of up to 0.15mm when nitrided at 540°C, while still maintaining a high core strength.