17-4PH, UNS S17400, W.Nr. 1.4542 Date Sheet

Material

17-4PH, UNS S17400, W.Nr. 1.4542, AISI 630, X5CRNICUNB17-4-4

Overview

17-4PH is a chromium-nickel-copper precipitation-hardening martensitic stainless steel with an addition of niobium, combines high strength and hardness with good corrosion resistance. The material is magnetic and excellent mechanical characteristics, can be easily welded and processed by standard shop fabrication practices. Also, 17-4PH stainless steel provides high resistance to crack propagation, good transverse properties, and proven resistance to stress corrosion cracking in marine environments.

Application

Aerospace Industry: Structural components, landing gear, and aircraft fittings
Oil and Gas Industry: Valve components, wellhead equipment, and downhole tools
Chemical Processing: Pumps, valves, and heat exchangers
Medical Applications: Surgical instruments, orthopedic implants, and dental tools
Defense Applications: Barrels, firing pins, and receivers

Chemical Composition (%)

Standards	Steel Grades
	Chemical Composition %
	C:	Mn:	Si:	P:	S:	Cr:	Ni:	Mo:	Nb:	Cu:	N:
ASTM	17-4 PH - UNS S17400 - AISI 630
ASTM	<0.07	<1.0	<1.0	<0.04	<0.03	15.0 - 17.5	3.0 - 5.0	-	0.15 - 0.45	3.0 - 5.0	-
EN	X5CrNiCuNb16-4 - 1.4542
EN	<0.07	<1.5	<0.7	<0.04	<0.03	15.0 - 17.0	3.0 - 5.0	<0.6	<0.45	3.0 - 5.0	-
LW	X5CrNiCuNb17-4-4 - 1.4548
LW	<0.07	<1.0	<1.0	<0.025	<0.025	15.0 - 17.5	3.0 - 5.0	-	0.15 - 0.45	3.0 - 5.0	-
DIN	X4CrNiCuNb16-4 - 1.4540
DIN	<0.06	<1.0	<1.0	-	-	15.0 - 17.0	3.5 - 5.0	-	0.15 - 0.40	2.5 - 4.0	<0.05
AF	Z7CNU17-04 - 17-4 DP - X17U4
AF	<0.07	<1.0	<0.75	<0.04	<0.015	15.5 - 17.5	4.0 - 5.0	-	0.15 - 0.45	3.0 - 5.0	-
AF	Z7CNU16-04 - 174 PH
AF	<0.07	<1.0	<0.75	<0.035	<0.025	15.0 - 17.5	3.0 - 5.0	<0.5	0.15 - 0.45	3.0 - 5.0	-
GOST	05Ch16N4D2B - 05Х16Н4Д2Б
GOST	<0.07	<1.8	<0.8	<0.03	<0.03	15.0 - 17.5	2.0 - 5.0	-	0.05 - 0.5	1.5 - 3.0	-
GOST	07Ch16N4D4B-Sh - 07Х16Н4Д4Б-Ш - 07Ch14N4DB - 07Х14Н4ДБ
GOST	<0.7	<1.0	<1.0	<0.045	<0.03	15.0 - 17.0	3.0 - 5.0	<0.3	<0.45	3.0 - 5.0	-

Mechanical Property

Delivery condition +A	HRC Hardness: <38 HB Hardness: <363
Delivery condition H900	Tensile strength, Rm: >1310 MPa Yield point, RP0,2: >1170 MPa Elongation, A: >10% Contraction, Z: >40% HB Hardness: >388 HRC Hardness: >40
Delivery condition H925	Tensile strength, Rm: >1170 MPa Yield point, Rp0,2: >1070 MPa Elongation, A: >10% Contraction, Z: >44% HB Hardness: >375 HRC Hardness: >38 Impact resistance, KV21℃: >6.8 J
Delivery condition H1025	Tensile strength, Rm: >1070 MPa Yield point, Rp0,2: >1000 MPa Elongation, A: >12% Contraction, Z: >45% HB Hardness: >331 HRC Hardness: >35 Impact resistance, KV21℃: >20 J
Delivery condition H1075	Tensile strength, Rm: >1000 MPa Yield point, Rp0,2: >860 MPa Elongation, A: >13% Contraction, Z: >45% HB Hardness: >311 HRC Hardness: >32 Impact resistance, KV21℃: >27 J
Delivery condition H1100	Tensile strength, Rm: >965 MPa Yield point, Rp0,2: >795 MPa Elongation, A: >14% Contraction, Z: >45% HB Hardness: >302 HRC Hardness: >31 Impact resistance, KV21℃: >34 J
Delivery condition H1150	Tensile strength, Rm: >930 MPa Yield point, Rp0,2: >725 MPa Elongation, A: >16% Contraction, Z: >50% HB Hardness: >277 HRC Hardness: >28 Impact resistance, KV21℃: >41 J
Delivery condition H1150M	Tensile strength, Rm: >795 MPa Yield point, Rp0,2: >520 MPa Elongation, A: >18% Contraction, Z: >55% HB Hardness: >255 HRC Hardness: >24 Impact resistance, KV21℃: >75 J
Delivery condition H1150D	Tensile strength, Rm: >860 MPa Yield point, Rp0,2: >725 MPa Elongation, A: >16% Contraction, Z: >50% HB Hardness: >255 HRC Hardness: >24 Impact resistance, KV21℃: >41 J

Corrosion Resistance

17-4PH has good corrosive resistance, is comparable to 304 stainless steel in most environments, and is generally superior to the 400 series stainless steels. Its suitable for applications where the combination of moderate corrosion resistance and unusually high strength are required. Like 304, this grade is subject to pitting and crevice corrosion in warm chloride environments. Highly resistant to stress corrosion cracking if aged at 550°C or higher. Higher aging temperatures give better SCC resistance. Its important to note that 17-4PH material should not generally be put in service in the solution-annealed condition A, because the material has lower resistance to stress corrosion cracking, and lower ductility in this condition.

Heat Treatment

Solution Treatment (Condition A): Heat at 1040°C for ½ hour and cool to 30°C maximum in air. Oil quenching may be used for small non-intricate sections.

Age Hardening: After solution treatment a single low temperature "age hardening" treatment is employed to achieve required properties. This treatment results in no distortion and only superficial discolouration. A slight decrease in size takes place during the hardening

Heating and Pickling

Heating of 17-4PH material is commonly performed for heat treatment purposes. The process involves heating the material to specific temperatures and holding it for a certain duration in controlled atmospheres, and air cooling or quenching, to prevent oxidation and achieve desired mechanical propertie, improve strength and hardness. Post-treatment processes may be necessary to meet the final product specifications.

Pickling is a common process used to remove surface impurities and oxide layers from 17-4PH stainless steel. It involves immersing the material in a pickling solution, typically an acid-based solution, to dissolve contaminants and restore the material's corrosion resistance.

Hot and Cold Forming

Hot Forming: Heat uniformly at 1742–2192°F (950–1200°C). A full solution anneal, cooling lower than 76°F (25°C) and aging at the required temperature must occur after hot forming. The post forming heat treatment should be a function of the desired mechanical properties.

Cold Forming: 17-4PH has limited cold forming properties. Cold forming can only be undertaken on plates in the fully annealed condition. Stress corrosion resistance is enhanced by re-aging at the precipitation hardening temperature after cold working.

Machining

17-4PH can be machined in both solution-annealed and precipitation-hardened conditions. Machining characteristics may vary according to the hardness of the metal. High speed tools are acceptable, but carbide tools are preferred. Due to the final hardening temperatures are low, 17-4PH can be machined to final dimensions in condition A without allowance for scaling or distortion, to save costs.

Welding

17-4PH stianless steel can be readily welded by most standard processes including SMAW, GTAW, PAW and GMAW. Favorable chemical composition accounts for the good performance of 17-4PH stainless steel in welding. Copper in the alloy is present in a form that does not affect welding behavior, The small amount of niobium that is present plays no significant part in welding. The low carbon content is an important feature for it restricts the hardness of rapidly cooled material and minimizes the chance of cracking in the weld metal and the heat-affected zone of the base metal. The low hardness eliminates the need for preheating in most applications.

Product Forms

Bar & Rod
Plate & Sheet
Coil & Strip
Pipe & Tube
Fitting: Flange, Tee, Elbow, Reducer etc.
Forging: Ring, Shaft, Circle, Block etc.

Note

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Materials

17-4PH

Material

Overview

Application

Chemical Composition (%)

Mechanical Property

Corrosion Resistance

Heat Treatment

Heating and Pickling

Hot and Cold Forming

Machining

Welding

Product Forms

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