1.4539 stainless steel equivalent astm

What is 1.4539 material?

EN 1.4539, also known as 904L stainless steel, UNS number N08904, is a high-alloy austenitic stainless steel containing a large amount of nickel and molybdenum. Due to its excellent resistance to acids, chlorides and seawater, this material is widely used in highly corrosive environments and corrosive chemical processing industries. It can be processed into a variety of practical product forms, including plates, coils, pipes, bars, and wires.

 

What material is 1.4539 equivalent to?

Material 1.4539 (EN standard) is primarily equivalent to 904L stainless steel (AISI 904L) and UNS N08904. This is a high-alloy, super-austenitic stainless steel with very low carbon, featuring high nickel (23–28%), chromium (19–23%), and molybdenum (4–5%), plus copper (1–2%), often referred to in DIN standards as X1NiCrMoCu25-20-5.

Region	Standard	Grade Designation
Europe	EN 10088	1.4539 / X1NiCrMoCu25-20-5
USA	ASTM / AISI	AISI 904L / UNS N08904
China	GB/T	00Cr20Ni25Mo4.5Cu
Japan	JIS	SUS 890L
Sweden	SS	2562

 

1.4539 stainless steel composition 

According to EN 10088-2 / EN 10088-3

Element	Symbol	Min (%)	Max (%)
Carbon	C	-	0.020
Chromium	Cr	19.00	21.00
Nickel	Ni	23.00	28.00
Molybdenum	Mo	4.00	5.00
Copper	Cu	1.20	2.00
Manganese	Mn	-	2.00
Silicon	Si	-	0.70
Nitrogen	N	-	0.15
Phosphorus	P	-	0.045
Sulfur	S	-	0.010
Iron	Fe	Balance	Balance

 

1.4539 stainless steel Mechanical Properties (at Room Temperature)

Values for Solution Annealed condition (+AT)

Property	Value (Metric)	Value (Imperial)
Tensile Strength (Rm)	520 – 720 MPa	75 – 104 ksi
Yield Strength (Rp0.2)	≥ 230 MPa	≥ 33 ksi
Yield Strength (Rp1.0)	≥ 260 MPa	≥ 38 ksi
Elongation (A5)	≥ 35%	≥ 35%
Impact Energy (ISO-V)	≥ 100 J	≥ 74 ft-lb
Hardness (Brinell - HBW)	≤ 230 HB	≤ 230 HB

 

1.4539 stainless steel Physical Properties (Average Values)

Property	Value at 20°C	Unit
Density	8.0	kg/dm ³
Modulus of Elasticity	190	GPa
Thermal Conductivity	12	W/(m·K)
Specific Heat Capacity	450	J/(kg·K)
Electrical Resistivity	1.00	Ω·mm²/m
Thermal Expansion Coeff.	15.8 (20-100°C)	10⁻⁶/K
Magnetic Permeability	< 1.01 (Non-magnetic)	μ

 

EN 1.4539 stainless steel Corrosion resistance

EN 1.4539 (904L) is a high-alloy, superaustenitic stainless steel designed for extreme corrosion resistance, particularly against sulfuric, phosphoric, and organic acids. It offers superior resistance to pitting, crevice corrosion, and chloride-induced stress corrosion cracking compared to 316L, due to high nickel (23–28%), molybdenum (4-5%), and copper additions.

Weldability and formability of 1.4539 stainless steel

1.4539 Can be welded using all common welding processes (TIG, MIG, MMA). Due to its all-austenitic structure, it is susceptible to hot cracking. Low heat input and matched welding wire (E 20 25 5 L Cu or N08904) should be used. Post-weld heat treatment is usually not required.

 

1.4539 stainless steel Forging/Hot Forming:

Heat to 1150°C to 1200°C. Final temperature above 950°C. Rapid cooling (water or air) is necessary to avoid σ phase precipitation.

 

1.4539 stainless steel Solution Annealing:

Heat to 1050°C to 1150°C, then rapidly water or air cool. This ensures optimal corrosion resistance.

Is 1.4539 stainless steel magnetic?

1.4539 (also known as 904L or UNS N08904) is a super austenitic stainless steel that is generally non-magnetic in its annealed condition. Due to its high nickel and chromium content, this material provides excellent corrosion resistance and is usually chosen for non-magnetic applications.

 

What is the difference between 1.4539 and 1.4529?

1.4529 (Alloy 926/6Mo) is a "super austenitic" reinforced version of 1.4539 (904L), with a higher molybdenum content (approximately 6.5% compared to approximately 4.5%) and nitrogen content. This gives 1.4529 stronger resistance to pitting, crevice corrosion, and chloride corrosion (e.g., in seawater, swimming pools), while 1.4539 is well-suited for storing sulfuric acid/phosphoric acid.

 

1.4539 Stainless Steel Applications

Chemical processing and manufacturing: Tanks, heat exchangers, pipelines, and reactors suitable for handling strong acids (e.g., sulfuric acid, phosphoric acid, and acetic acid).

Marine and offshore environments: Seawater cooling equipment, desalination plants, and offshore platform components.

Pollution control (environmental technology): Widely used in gas scrubbing units (flue gas desulfurization), especially absorbers and scrubbers.

 

If you have any needs for 1.4539 stainless steel projects, please feel free to place an order. GNEE maintains a large inventory of commonly used products for your selection. These products can be processed into various practical forms, including plates, coils, tubes, bars, and wires. GNEE typically keeps a regular stock of commonly used 904L plates and bars, significantly reducing lead times for these special steel grades.

AISI 904L (UNS N08904) stianless steel Specifications

Product Category	Product Form	Typical Dimensions (Size Range)	Standard Specification (ASTM/ASME)	Surface Finish / Delivery Condition
Flat Products	Cold Rolled Sheet/Coil	0.3 mm – 6.0 mm	ASTM A240	2B, BA, No.4, Hairline, 8K Mirror
	Hot Rolled Plate	3.0 mm – 100 mm	ASTM A240	No.1 (Annealed & Pickled)
Tubular Products	Seamless Pipe/Tube	OD: 6 mm – 530 mm	ASTM A312 / A213 / A269	Solution Annealed & Pickled
	Welded Pipe/Tube	OD: 12.7 mm – 1219 mm	ASTM A312 / A249 / A358	Beads removed, Polished or Pickled
Long Products	Round Bar	Dia: 5 mm – 500 mm	ASTM A276 / A479	Bright, Peeled, Polished, or Black
	Hex / Square / Flat Bar	10 mm – 200 mm	ASTM A276	Cold Drawn or Hot Rolled