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STAINLESS STEEL - Alloy 17-4PH

 

TYPICAL ANALYSIS

C.
Si.
S.
P.
Mn.
Ni.
Cr.
Cu.
Nb./Cb.+Ta.
0.03%
0.30%
0.02%
0.02%
0.80%
4.50%
15.50%
3.25%
0.25%


Comparable standards: UNS17400 Type 630 ASTM A564 Type 630

  • 17-4PH is a precipitation-hardening martensitic stainless steel, which combines high strength and hardness (after heat treatment) with excellent corrosion resistance, and is suitable for easy fabrication.

    Solution Treatments: As supplied 17-4PH, is usually in the solution treated condition, (Condition A). It can be heat treated at different temperatures to off a wide range of properties. (We also hold stock in HH1150).

 

Principal Design Features

  • 17-4PH is a precipitation-hardening martensitic stainless steel, which combines high strength and hardness (after heat treatment) with excellent corrosion resistance, and is suitable for easy fabrication.
  • Solution Treatments: As supplied 17-4PH, is usually in the solution treated condition, (Condition A). It can be heat treated at different temperatures to off a wide range of properties. (We also hold stock in HH1150).


  • Condition

    		 Hardening
    Temperature    		 Hardening Time (Hours) Type of Cooling Hardness
    Brinell Rockwell C
    A 1038° C ½ Oil/Air
    (to below 32° C)    		 363 max. 39 max.
    H 900 480° C 1 Air 420 44
    H 925 495° C 4 Air 409 42
    H 1025 550° C 4 Air 352 38
    H 1075 580° C 4 Air 341 36
    H 1100 595° C 4 Air 332 35
    H 1150 621° C 4 Air 311 33
    H 1150
    +1150    		 760° C
    760° C    		 4 followed by 4 Air
    Air    		 302 31
    H 1150-M 760° C
    620° C    		 2 followed by 4 Air
    Air    		 277 27


Typical Mechanical Properties



Condition
A H900 H925 H1025 H1075 H1100 H1150 H1150
+1150		 H1150-M
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 13

 

 

 

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 preheating.

 

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 stainless. Its corrosion resistance is comparable to grade 304 stainless.

 

Fabrication

17-4PH Condition A is suitable for limited cold forming. H1100, H1150 and overaged conditions are more suitable when severe cold forming is required.

Machining

  • Machining 17-4PH Condition A 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 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 64/67Rc can be achieved, with a surface hardness depth of up to 0.150mm, when nitrided at 540° C, while still maintaining a high core strength.

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