17-4 ph Stainless Steel

We are Malaysia Stainless Steel supplier with full range of Stainless Steel sheets, stainless steel round bar , stainless steel rod, stainless steel plate,  300 Series stainless steel , 400 series stainless steel , 253ma, sus301, sus304, sus304l, sus309,  sus310, sus316ti, sus317, sus321, sus403 , sus410 , sus420 , sus430, sus431 , sus440c , sus630 , 17-4PH, s31803 , s32750 , s32760, s31254, s320j4l, Nitronic30, Nitronic50 , Nictronic60

Description

17 – 4 PH Stainless Steel , UNS S17400, 1.4548, SUS630

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 17-4 PH is usually in the solution treated condition (Condition A). It can be heat treated at different temperatures to offer a wide range of properties.

   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 594°C 4 Air 409 42
H1025 55°C 4 Air 352 38
H1075 85°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


      Mechanical Properties of 17.4PH / SUS 630 (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 SUS 420, SUS 431 and SUS 410. Its corrosion resistance is comparable to grade SUS 304 Stainless.

Welding
Arc and resistance welding processes used on standard grades of stainless steel are applicable to 17.4 PH 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
17/4 PH Condition has machining characteristics similar to stainless steel grade SS302, SS304 and SS410. 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 / SUS630 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 45°C, while still maintaining a high core strength.