UGI® 4539

UGI® 4539

UGI® 4539 introduction

UGI® 4539 is austenitic steel that is designed for high corrosion resistance, especially in Sulfuric Acid, in a wide range of process (chemical) environments. The combination of high chromium and nickel content, coupled with additions of molybdenum assure good to excellent corrosion resistance.

It has a fully austenitic micro structure.


This grade is non-magnetic in all conditions and has excellent Weldability and formability. The austenitic structure also gives this grade excellent toughness, even down to cryogenic temperatures.

Equivalent material: EN 1.4539, ASTM 904L, UNS N08904, AISI 904L, AFNOR Z1NCDU25-20-4, DIN 1.4539, SS 2562

UGI® 4539 general

Property Value
Density Density of 8 g/cm³

UGI® 4539 thermal

Property Temperature Value Comment
Coefficient of thermal expansion - Coefficient of thermal expansion of 0.000014 1/K 20 to 100°C
- - Coefficient of thermal expansion of 0.000016 1/K 20 to 200°C
- - Coefficient of thermal expansion of 0.000018 1/K 20 to 300°C
- - Coefficient of thermal expansion of 0.00002 1/K 20 to 400°C
- - Coefficient of thermal expansion of 0.000022 1/K 20 to 500°C
Specific heat capacity 100 °C Specific heat capacity of 485 J/(kg·K) -
- 200 °C Specific heat capacity of 515 J/(kg·K) -
- 300 °C Specific heat capacity of 545 J/(kg·K) -
- 400 °C Specific heat capacity of 570 J/(kg·K) -
- 500 °C Specific heat capacity of 590 J/(kg·K) -
Thermal conductivity 100 °C Thermal conductivity of 14 W/(m·K) -
- 200 °C Thermal conductivity of 16 W/(m·K) -
- 300 °C Thermal conductivity of 18 W/(m·K) -
- 400 °C Thermal conductivity of 20 W/(m·K) -
- 500 °C Thermal conductivity of 22 W/(m·K) -

UGI® 4539 chemical

Property Value Comment
Carbon Carbon of 0.02 max.
Chromium Chromium of 19.0 - 21.0 % -
Copper Copper of 1.0 - 2.0 % -
Manganese Manganese of 2.0 max.
Molybdenum Molybdenum of 4.0 - 5.0 % -
Nickel Nickel of 23.0 - 28.0 % -
Nitrogen Nitrogen of 0.1 max.
Phosphorus Phosphorus of 0.035 max.
Silicon Silicon of 0.7000000000000001 max.
Sulfur Sulfur of 0.015 max.

UGI® 4539 electrical

Property Temperature Value
Electrical resistivity 100 °C Electrical resistivity of 0.00000099 Ω·m
- 200 °C Electrical resistivity of 0.00000107 Ω·m
- 300 °C Electrical resistivity of 0.00000113 Ω·m
- 400 °C Electrical resistivity of 0.00000115 Ω·m
- 500 °C Electrical resistivity of 0.00000117 Ω·m

UGI® 4539 mechanical

Property Temperature Value Comment
Charpy impact energy, V-notch - Charpy impact energy, V-notch of 100 J min.
Elastic modulus 100 °C Elastic modulus of 190 GPa -
- 200 °C Elastic modulus of 180 GPa -
- 300 °C Elastic modulus of 172 GPa -
- 400 °C Elastic modulus of 165 GPa -
- 500 °C Elastic modulus of 158 GPa -
Elongation - Elongation of 35 % -
Hardness, Brinell - Hardness, Brinell of 230.0 max.
Tensile strength - Tensile strength of 530.0 - 730.0 MPa -

UGI® 4539 application

Property - -
Application areas
Cold Forming
Corrosion properties Acid or alkaline concentration
Weight %		 H₂SO₄
20%		 H₂SO₄
40%		 H₂SO₄
60%		 HCL
1%		 HCL
2%		 HCL
3%		 NaOH
20%		 NaOH
40%		 NaOH
60%
Temperature limit* in °C (< 0.1 mm /y) 70°C 55°C 40°C 60°C 30°C 20°C 170°C 125°C 160°C

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