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Home » Materials » Stainless Steel » 17-4 PH Stainless

17-4 PH UNS S17400

A martensitic precipitation hardening steel, 17-4 PH stainless steel offers high strength combined with excellent corrosion resistance. 17-4 PH has good fabrication charictaristics and can be aged in a single step low temperature heat treatment.

Applications: Used when high transverse strength is required. Valve parts, Paper mills, aircraft and power generation, chemical processing, nuclear and space craft.

Heat Treatment: Solution heat treatment, heat at 1900f +/- 25f (1038c +/- 14c) cool to below 90f (32c) to allow material to fully martensite. Small sections under 3” may be oil cooled, sections larger should be rapidly air cooled (fan cooling). Parts should not be used in this condition, they should be age hardened between 900f and 1150f. Toughness, impact strength as well as stress corrosion cracking may occur without aging.

Aging: All solution treated materials: Condition H-900 1hr and air cool. H-925 through H-1150 four hours +/- 25f and air cool. For condition H1150M 1400f +/- 15f 2 hours air cool, then heat at 1150f +/- 15f for four hours and air cool.

Chemistry Analysis
Carbon max 0.07% Manganese max 1.00%
Phosphorus max 0.04% Sulfur max 0.030%
Silicon max 1.00% Chromium   15.00 - 17.50%
Nickel   3.00% - 5.00% Columbium + Tantulum   0.15 - 0.45%
Iron   Balance Copper   3.00 - 5.00%

Corrosion Resistance

The following table is for reference only, many factors can affect the corrosive resistance, a corrosion test for each application should be applied.

Phosphoric acid Moderate Acetic Acid Moderate
Sodium Hydroxide Moderate Sea Water Restricted
Salt Spray Moderate Nitric Acid Good
Sulfuric Acid Moderate Humidity Excellent

Typical Room Temperature Tensile Properties

Solution treated 1900f (1038c) and air cooled, followed by tempering at indicated temperature, longitudinal direction.
Temper Temperature Yield 0.2% Yield 0.2% Ultimate Tensile Strength   %Elongation in 2" {50.8mm} hardness Brinell % Reduction of Area Charpy V-notch
      0.2% offset 0.2% offset       ft-lb j
F ksi mpa ksi Mpa          
H900 183 1262 198 1375 15 420 52 16 21
H1025 162 1117 168 1158 16 352 58 40 54
H1075 148 1020 164 1131 17 341 59 45 61
H1150 126 1869 144 993 20 311 60 55 75
H1150M 87 600 123 848 22 277 66 100 136
Machinability:
15-5 PH machines easily in the solution treated or aged condition. Machines similar to 304 stainless steel. Machinability will imrove as the aging temperature is increased. Condition H1150M is the optimum machining condition.
Specifications:
AMS 5659 AMS 2300 ASTM A564 ASTM A705 ASME A705 EN10204 DIN3.1B
Machinability:
303 Stainless machines easily with a brittle chip. Grinding and polishing are possible with 303 Stainless with satisfactory results. Our forging operation can increase the results for polishing this grade.
Specifications:
AMS 5640 ASTM A473 ASTM A582 EN10204 DIN3.1B
Shapes Manufactured:
Flat Bars, Square Bars, Round Bars, Rings, Hollows, Discs, Blocks and special Shapes. Send us a drawing to see how we can save you material and machining time!

The information in this data sheet is for information only and should not be used for engineering.


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