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Product Details
Sandmeyer Steel Company stocks Alloy 904L stainless steel plate in thicknesses from 3/16" through 2". Alloy 904L (UNS N08904) is a superaustenitic stainless steel designed for corrosion and pitting resistance in a wide range of process environments. It is used extensively in the chemical process industry including the production of phosphate-based fertilizers.
Available thicknesses for Alloy 904L:
General Properties
Alloy 904L (UNS N08904) is a superaustenitic stainless steel that is designed for moderate to high corrosion resistance in a wide range of process environments. The combination of high chromium and nickel content, coupled with additions of molybdenum and copper, assure good to excellent corrosion resistance.
With its highly alloyed chemistry — 25% nickel and 4.5% molybdenum, 904L provides good chloride stress corrosion cracking resistance, pitting and general corrosion resistance superior to 316L and 317L molybdenum enhanced stainless steels.
Alloy 904L was originally developed to withstand environments containing dilute sulfuric acid. It also offers good resistance to other inorganic acids such as hot phosphoric acid as well as most organic acids.
Alloy 904L is easily welded and processed by standard shop fabrication practices.
Uniform Corrosion in pickling acid* at 25°C
*Composition: 20% HNO3 + 4 HF.
Uniform Corrosion in wet process phosphoric acid at 60°C
Composition: 54% P2O5, 0.06% HCI, 1.1% HF, 4,0% H2SO4, 0.27% Fe2O3, 0.17% AI2O3, 0.10% SiO2, 0.20% CaO and 0.70% MgO.
Corrosion rates in fatty acid column for the distillation of tall oil at 253°C
Chemical Analysis
Weight % (all values are maximum unless a range is otherwise indicated)
Physical Properties
Density
0.287 lbs/in37.95 g/cm3
Specific Heat
0.11 BTU/lb-°F (32 – 212°F)450 J/kg-°K (0 – 100°C)
Modulus of Elasticity
28.0 x 106 psi190 GPa
Thermal Conductivity 212°F (100°C)
6.8 BTU/Ft-hr°F12.9 W/m-°K
Melting Range
2372 – 2534°F1300 – 1390°C
Electrical Resistivity
33.5 Microhm-in at 68°C95.2 Microhm-cm at 20°C
Mean Coefficient of Thermal Expansion
Mechanical Properties
Typical Values at 68°F (20°C) (minimum values, unless specified)
Fabrication Data
Alloy 904L can be easily welded and processed by standard shop fabrication practices.
Cold Forming
904L is quite ductile and forms easily. The addition of molybdenum and nitrogen implies more powerful processing equipment may be necessary when compared with the standard 304/304L grades.
Hot Forming
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).
Machining
The cold work hardening rate of Alloy 904L makes it less machinable than 410 and 304 stainless steels.
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.
Product Show
We are manufacturer in steel supplier from China, is a reliable and integrity steel supplier. With more than 10 years steel processing and exporter experiences, we have a factory building of 20000 square meters and annual production of 23,000 tons. We specialized in the production of stainless steel, carbon steel, galvanized steel, aluminum, copper products, etc., suitable for fields such as engineering, coal mining, textiles, electricity, boilers, machinery, etc. Our products have passed the ISO9001 quality system certification and the EU CE certification.
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