Duplex 2205 Technical Information

904L is an austenitic grade stainless steel with low carbon and higher resistance to stress and crevice corrosion cracking as compared to AISI 316 & AISI 317 stainless steel grades. Due to addition of Copper, it has increased resistance to phosphoric, sulphuric and hydrochloric acid concentration. It is sometimes referred to as super austenitic stainless steel due to superiority over other 300 series austenitic steel grades. 904L is also resistant to chloride and sea water attack. 904L is primarily used in production and transport of phosphoric acid as well as in environment containing concentrations of phosphoric acid or phosphorous gas.

Download Duplex 2205 Data Sheet

Duplex 2205 Properties

Duplex 2205 Chemical Composition
Elements	Carbon	Manganese	Phosphorus	Sulphur	Silicon	Chromium	Nickel	Molybdenum	Nitrogen	Copper
Compositions by %	0.02 max	2.00	0.045	0.035	1.00	19.0 - 23.0	23.0 - 28.0	4.0 - 5.0	0.1	1.0 - 2.0

Duplex 2205 Mechanical Properties
Tensile Strength, min	Yield Strength, min	Elongation, min	Reduction of Area, min	Hardness
490 MPa	220 MPa	35%

Duplex 2205 Physical Properties
Elastic Modulus	Mean Co-Efficient of Expansion (0-100ºC)	Thermal Conductivity (At 20ºC)	Specific Heat (0-100ºC)	Electric Resistivity
190 GPa	15 µm/m/ºC	11.5 W/m.K	500 J/Kg.K	952 nΩ.m

Duplex 2205 Density

Kg/m3	Lb/ft3
7900	493

Duplex 2205 Melting Point

904L Stainless Steel has a melting range between 1300 - 1390 °C (2372 - 2534°F)

Duplex 2205 Heat Treatment

904L has austenitic stainless steel chemistry and can be strengthened by solution annealing at 1090 to 1175ºC, followed by rapid water quenching. 904L can be hardened using heat treatment.

Duplex 2205 Machining

Grade 904L stainless steels are high purity steels with low sulfur content. They can be machined using any standard methods. These grades can be readily bent to a small radius under cold conditions. Although subsequent annealing is not required in most cases, it should be carried out when the fabrication is performed under severe stress corrosion cracking conditions.

Duplex 2205 Substitute Grades

316L	With Lower corrosion resistance and cost effective
6Mo Alloys	With higher resistance to pitting and crevice corrosion
Duplex 2205	With similar corrosion resistance, higher mechanical strength and lower cost but not suitable for temperature above 300ºC

Duplex 2205 Equivalent Grade Designation

AISI	UNS	DIN / EN / Werkstoff Number	Euronorm / DIN Name	Brand Name
904L	N08904	1.4539	X1-Ni-Cr-Mo-Cu-25-20-5	URANUS® B6

Duplex 2205 Product Specifications

Seamless / Welded Pipe	ASTM A312 TP 904L
Seamless / Welded Tubing	ASTM A269 TP 904L
Bar / Rod	ASTM A276 / A479 TP 904L
Forging	ASTM A182 F904L
Sheet / Plate	ASTM A240 UNS N08904
Welding Consumable	AWS A5.9 ER385