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Grade 904L stainless steel is a non-stabilized austenitic stainless steel with low carbon content. This high alloy stainless steel is added with copper to improve its resistance to strong reducing acids, such as sulphuric acid. The steel is also resistant to stress corrosion cracking and crevice corrosion. Grade 904L is non-magnetic, and offers excellent formability, toughness and weldability.
904L is an austenitic stainless steel. It is softer than 316L,[1] [2] and its molybdenum addition gives it superior resistance to localized attack (pitting and crevice corrosion) by chlorides and greater resistance reducing acids; in particular, its copper addition gives it useful corrosion resistance to all concentrations of sulfuric acid. Its high alloying content also gives it greater resistance to chloride stress corrosion cracking, but it is still susceptible. Its low carbon content makes it resistant to sensitization by welding and prevents intergranular corrosion.
Chemical composition of 904L(1.4539)
Cr | 19.00-21.00 |
Ni | 24.00-26.00 |
Mo | 4.00-5.00 |
C | 0.02 |
N | 0.15 |
Mn | 2.00 |
Si | 0.70 |
Cu | 1.2-2.0 |
P | 0.03 |
S | MAX0.01 |
Mechanical Properties of 904L(1.4539)
Tensile strength (MPa) min | 490 |
0.2% Yield strength proof (MPa)min | 220 |
Elongation A5 min | 36 |
Hardness Brinell(HB) | 150 |
Welding
Alloy 904L can be readily welded by most standard processes. Austenitic plate materials have a homogeneous austenitic structure with an even distribution of alloying elements. Solidification after welding causes the redistribution of certain elements such as molybdenum, chromium and nickel. These segregations remain in the cast structure of the weld and can impair the corrosion resistance in certain environments. Segregation is less evident in 904L, and this material is normally welded using a filler metal of the same composition as the base metal and can even be welded without filler metal. The welding consumables for 904L are 20 25 CuL covered electrode
Heat Treatment
Working temperatures of 1562 – 2102°F (850 –1150°C) are recommended for hot working processes. Normally hot working should be followed by a solution anneal and quench, but for 904L, if hot forming is discontinued at a temperature above 2012°F (1100°C) and the material is quenched directly thereafter, the material may be used without subsequent heat treatment. It is important that the entire workpiece be quenched from temperatures above 2012°F (1100°C). In the event of partial heating or cooling below 2012°F (1100°C), or if the cooling has been too slow, hot working should always be followed by a solution anneal and quenching. 904L should be solution annealed at 1940–2084°F (1060–1140°C)
Our services
We can cut and bend steel plate according to customer's requriement or drawing,
packaging according to customers' request.
Application
Oil and gas industry equipment
piping & heat exchangers
Chemical process pressure vessels
Flue Gas Scrubbing Equipment
Marine Applications
Offshore Oil production/technology
Pulp & Paper Mill Equipment
Grade 904L stainless steel is a non-stabilized austenitic stainless steel with low carbon content. This high alloy stainless steel is added with copper to improve its resistance to strong reducing acids, such as sulphuric acid. The steel is also resistant to stress corrosion cracking and crevice corrosion. Grade 904L is non-magnetic, and offers excellent formability, toughness and weldability.
904L is an austenitic stainless steel. It is softer than 316L,[1] [2] and its molybdenum addition gives it superior resistance to localized attack (pitting and crevice corrosion) by chlorides and greater resistance reducing acids; in particular, its copper addition gives it useful corrosion resistance to all concentrations of sulfuric acid. Its high alloying content also gives it greater resistance to chloride stress corrosion cracking, but it is still susceptible. Its low carbon content makes it resistant to sensitization by welding and prevents intergranular corrosion.
Chemical composition of 904L(1.4539)
Cr | 19.00-21.00 |
Ni | 24.00-26.00 |
Mo | 4.00-5.00 |
C | 0.02 |
N | 0.15 |
Mn | 2.00 |
Si | 0.70 |
Cu | 1.2-2.0 |
P | 0.03 |
S | MAX0.01 |
Mechanical Properties of 904L(1.4539)
Tensile strength (MPa) min | 490 |
0.2% Yield strength proof (MPa)min | 220 |
Elongation A5 min | 36 |
Hardness Brinell(HB) | 150 |
Welding
Alloy 904L can be readily welded by most standard processes. Austenitic plate materials have a homogeneous austenitic structure with an even distribution of alloying elements. Solidification after welding causes the redistribution of certain elements such as molybdenum, chromium and nickel. These segregations remain in the cast structure of the weld and can impair the corrosion resistance in certain environments. Segregation is less evident in 904L, and this material is normally welded using a filler metal of the same composition as the base metal and can even be welded without filler metal. The welding consumables for 904L are 20 25 CuL covered electrode
Heat Treatment
Working temperatures of 1562 – 2102°F (850 –1150°C) are recommended for hot working processes. Normally hot working should be followed by a solution anneal and quench, but for 904L, if hot forming is discontinued at a temperature above 2012°F (1100°C) and the material is quenched directly thereafter, the material may be used without subsequent heat treatment. It is important that the entire workpiece be quenched from temperatures above 2012°F (1100°C). In the event of partial heating or cooling below 2012°F (1100°C), or if the cooling has been too slow, hot working should always be followed by a solution anneal and quenching. 904L should be solution annealed at 1940–2084°F (1060–1140°C)
Our services
We can cut and bend steel plate according to customer's requriement or drawing,
packaging according to customers' request.
Application
Oil and gas industry equipment
piping & heat exchangers
Chemical process pressure vessels
Flue Gas Scrubbing Equipment
Marine Applications
Offshore Oil production/technology
Pulp & Paper Mill Equipment
