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1.4542 / SS630 / 17-4PH

SS630 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.

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


Analysis
Carbon0.07% maxChromium15.00-17.00%
Manganese1.00% maxNickel3.00-5.00%
Silicon1.00% maxCopper3.00-5.00%
Phosphorous0.04% maxNiobium + 0.15-0.45%
Sulphur0.03% maxTantalum

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 H1150x2


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.


Contact our experienced sales team who will assist you with your 17-4PH stainless steel enquiry.





FlatDiameter

Applications

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.


Forging

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.


Corrosion Resistance

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.


Welding

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.


Machining

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.


Nitriding

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.


Solution Treatment Typical Properties

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

 Hardness 
Temp. [°C]

Hardness 
Time
Type of 
Cooling

Hardness

HB

HRc

A10381/2Oil/Air (to below 32°C)363 max39 max
H9004801Air42044
H9254954Air40942
H10255504Air35238
H10755804Air34136
H11005954Air33235
H11506214Air31133
H1150+H1150760-7604 followed by 4Air30233
H1150M760-6202 followed by 4Air27727

Typical Mechanical Properties*

Condition

A

H900

H925

H1025

H1075

H1100

H1150
H1150
+H1150

H1150M
Tensile Strength N/mm²1034138013101170114010351000965860
0.2% YS N/mm²6501275120011401035930860760585
Reduction of Area %30-605054565858606068
Elongation %6-151414151617192022
Charpy Impact J-203447616168108135

*Longitudinal


Heat Treatment

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.


Certification

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


Quality Assured Supply

17-4 PH stainless is supplied in accordance with our ISO 9001 : 2008 registration.


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