17-4PH Stainless Steel

17-4PH stainless steel stockholders and suppliers. 17-4PH is a precipitation hardening corrosion resistant grade supplied as round and flat available for delivery to the whole of the UK. 17-4PH is a corrosion resistant grade which is soft and ductile in the solution annealed condition. Medium to high strength, good toughness and strength is obtained by the appropriate ageing treatment. As a martensitic precipitation hardening stainless it is characterised by high tensile strength and high yield strength obtained by solution annealing, followed by a single or double low temperature age hardening treatment. 17-4PH has corrosive properties comparable to 304 austenitic stainless steel in many environments.

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Related Specifications

EN/DIN1.4542 X5CrNiCuNb16.4 AFNOR Z6CNU17-O4
ASTM-A564 Grade 630 UNS S17400 JIS SUS630
AMS 5643 5604 EN10088-3 H900 H1025 H1075 H1150D

Alternative stainless grades we supply

FV520B | S31254 | 904L | 310 | 321 | 316 | 440B | 440C | 420 | 410 | 416 | 431 | S31803 | S32760

Form of Supply

17-4PH is commonly stocked in round bar in the following conditions:-
17-4PH Condition A
17-4PH H900
17-4PH H1025
17-4PH H1075
17-4PH H1150+H1150

Flat bar is stocked in Condition A and can be cut to your specific requirements. We can also offer precision ground bar whcih can be produced and supplied ground to your required tolerances.

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  • Flat
  • Diameter

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Commonly used in industries such as offshore, marine, food, paper mills, oil field and aerospace. 17-4PH is used for components such as fasteners, couplings, screws, bushings, studs, fittings, valve stems, roller, wear rings.

Carbon 0.07% max Chromium 15.00-17.50%
Manganese 1.00% max Nickel 3.00-5.00%
Silicon 1.00% max Copper 3.00-5.00%
Phosphorous 0.04% max Niobium + 0.15-0.45%
Sulphur 0.03% max Tantalum

Heat slowly and uniformly to 1180-1200ºC. Do not forge below 1010ºC. Hold at temperature for one hour prior to forging the component. Cool in air to room temperature. Forged components require solution annealing before any further heat treatment.

17-4PH stainless has very good corrosion resistance properties. Corrosion tests in service have shown good results in all aged conditions. With better corrosion resistance to standard hardenable stainless grades such as 431, 420 and 410. 17-4PH has corrosion resistance comparable to 304 stainless specification.

17-4PH requires similar arc and resistance welding processes to those used on standard specifications of stainless steel. Welding up to 100mm thick can be carried out without the requirement of pre heating due to its low hardness. We recommend you contact your welding consumables supplier who should provide you full assistance and information on welding 17-4PH stainless steel.

Similar in machining characteristics to 304 and 410 stainless steel specifications. Condition H900 has high hardness and strength which is the most difficult to machine and the machining of this is recommended to be carried out at 60% of the rate which is used for Condition A.

For increase resistance to surface wear, with a slight reduction in corrosion resistance, 17-4PH can be nitrided. When nitrided at 540ºC an approximate hardness of 64-67 HRc is achievable, with a surface hardness depth of up to 0.15mm. The steel maintains a high core strength.

17-4PH is commonly supplied in the solution treated condition (Condition A). Heat treated at different temperatures will offer a wide range of properties. (We also hold stock in H1150+H1150).

Condition Temp. [°C] Hardness
Time (hours)
Type of
A 1038 1/2 Oil/Air (to below 32°C) 363 max 39 max
H900 480 1 Air 388-444 40-47
H925 495 4 Air 375-429 38-45
H1025 550 4 Air 331-401 34-42
H1075 580 4 Air 302-375 31-38
H1100 595 4 Air 293-363 30-37
H1150 621 4 Air 277-352 28-38
H1150+H1150 621-621 4 followed by 4 Air/Air 277-311 28-33

Condition A H900 H925 H1025 H1075 H1100 H1150 H1150
Tensile Strength N/mm² 1034 1380 1310 1170 1140 1035 1000 965 860
0.2% YS N/mm² 650 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 61 61 68 108 135


Heat treatment temperatures, including rate of heating, cooling and soaking times will vary due to factors such as the shape and size of each 17-4 PH steel component. Other considerations during the heat treatment process include the type of furnace, quenching medium and work piece transfer facilities. Please consult your heat treatment provider for full guidance on heat treatment of 17-4PH stainless steel.

Stainless steel grade 17-4 PH is available with BS EN 10204 3.1 mill certificate, please request when placing any orders.

17-4 PH stainless is supplied in accordance with our ISO 9001:2015 registration.