EN 1.4539 stainless steel chemical composition

 

1.4539 material is a super austenitic stainless steel, commonly known as 904L or UNS N08904, which exhibits excellent resistance to pitting corrosion, crevice corrosion, and stress corrosion cracking. It can be processed into various practical product forms, including plates, coils, tubes, bars, and wires, and is widely used in industries such as chemical processing, seawater systems, and papermaking.

 

 

Material 1.4539 (a European standard) is equivalent to 904L stainless steel, also known by its UNS number UNS N08904 and the full European name X1NiCrMoCu25-20-5, offering superior corrosion resistance for aggressive media like sulfuric acid, with common US equivalents in ASTM A240/A312.

Equivalents Of Grade 904L (USA: AISI, ASTM, UNS)

EU EN	USA -	France AFNOR	England BS	Sweden SS	Poland PN
X1NiCrMoCu25-20-5 (1.4539)	904L N08904	Z2NCDU25-20	904S13	2562	00H22N24M4TCu

 

 

1.4539 Material Equivalent Chemical Composition

Standards	Steel Grades
	Chemical Composition %
	C:	Mn:	Si:	P:	S:	Cr:	Ni:	Mo:	Ti:	Cu:	N:
EN	1.4539 - X1NiCrMoCu25-20-5 - X 1 NiCrMoCu 25-20-5
	<0.02	<2.0	<0.7	<0.030	<0.010	19.0 - 21.0	24.0 - 26.0	4.0 - 5.0	-	1.2 - 2.0	<0.15
ASTM	UNS N08904 - N 08904 - AISI 904L - AISI 904 L
	<0.02	<2.0	<1.0	<0.045	<0.035	19.0 - 23.0	23.0 - 28.0	4.0 - 5.0	-	1.0 - 2.0	<0.1
PN	0H22N24M4TCu
	<0.06	1.2 - 2.0	<1.0	<0.045	<0.030	20.0 - 22.0	24.0 - 26.0	4.0 - 5.0	<0.7	1.3 - 1.8	-
AFNOR	Z2NCDU25-20 - Z 2 NCDU 25-20 - Z2NCDU2520
	<0.02	<2.0	<0.4	<0.035	<0.010	19.0 - 21.0	24.0 - 26.0	4.0 - 5.0	-	1.0 - 2.0	-
BS	904S13 - 904 S 13
	<0.03	<2.0	<1.0	<0.040	<0.025	19.0 - 22.0	24.0 - 27.0	4.0 - 5.0	-	1.0 - 2.0	-
JIS	SUS 317 J5L TK - SUS 317 J5L TP - F SUS 317 J5L
	<0.02	<2.0	<1.0	<0.045	<0.030	19.0 - 23.0	23.0 - 28.0	4.0 - 5.0	-	1.0 - 2.0	-

 

Mechanical Properties of 1.4539 / 904L Stainless Steel

Property	Value (Typical)	Test Standard
Tensile Strength (Rm)	490–710 MPa	EN ISO 6892-1
Yield Strength (Rp0.2)	≥ 220 MPa	EN ISO 6892-1
Elongation (A5)	≥ 35%	EN ISO 6892-1
Hardness (Brinell)	≤ 220 HBW	EN ISO 6506-1
Modulus of Elasticity	~195 GPa	-
Density	~8.0 g/cm³	-

 

Physical Properties of 1.4539 Stainless Steel

Property	Value
Density	8.0 g/cm³
Melting Range	1300–1390°C
Thermal Conductivity (20°C)	12.0 W/m·K
Electrical Resistivity	0.95 μΩ·m
Specific Heat (20°C)	500 J/kg·K
Coefficient of Thermal Expansion (20–100°C)	15.0 ×10⁻⁶ /K

 

Heat Treatment of 1.4539 Stainless Steel

Process	Temperature Range	Notes
Solution Annealing	1090 – 1175°C	Followed by rapid cooling (usually water quenching)
Stress Relieving	Not commonly used	Risk of reduced corrosion resistance
Hardening	Not hardenable by heat treatment	Only via cold working

 

1.4539 Stainless Steel Corrosion Resistance
1.4539 stainless steel, a high-alloy martensitic grade, exhibits excellent corrosion resistance in oxidizing environments due to its high chromium (~17–19%) and nickel (~8–10%) content, making it suitable for applications in chemical, marine, and high-temperature environments, though it is less resistant than austenitic grades like 316L in highly chlorinated or acidic conditions.

1.4539 Stainless Steel Wear Resistance
After quenching and tempering, 1.4539 stainless steel achieves high hardness (~50–55 HRC), providing excellent wear and abrasion resistance, which makes it ideal for valve components, pump shafts, and mechanical wear parts subjected to repeated friction.

1.4539 Stainless Steel Heat Treatment
1.4539 stainless steel is heat-treatable through solution annealing, quenching, and tempering, allowing precise control of hardness, strength, and toughness, typically achieving tensile strength of 950–1,200 MPa while maintaining reasonable ductility.

 

Is 1.4539 Stainless Steel Magnetic?
Yes. In the annealed and quenched condition, 1.4539 is magnetic, as a martensitic stainless steel, which can be useful for magnetically sensitive mechanical components but should be considered in applications requiring non-magnetic properties.

 

 

At GNEE, 904L stianless steel is available in various forms to meet diverse industrial needs:
Plates and Sheets (cold rolled and hot rolled)
Bars and Rods (round, square, hexagonal)
Tubes (seamless and welded)
Wires and Strips (for springs, fasteners, electrical applications)
Forgings and Custom Parts (according to drawings or specifications)
Testing and Documentation: Mill Test Certificates, EN 10204 3.1, Chemical Reports, Mechanical Reports, Destructive Testing Reports, Non-Destructive Testing Reports, PMI Test Reports, Visual Inspection Reports, Third-Party Inspection Reports, NABL Certified Laboratory Reports.
Packaging: Wooden crates, bubble wrap, steel strapping, or packaged according to customer requirements.

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