No.1 2B Finish No. 8 BA /Bright Annealed Satin Finish Hairline Finish EN1.4539 ASTM A240 TP 904L Stainless Steel plate
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 is easily welded and processed by standard shop fabrication practices.
The corrosion resistance of grade 904L is intermediate between super austenitic grades, with 6% molybdenum content, and standard 316L austenitic grades. Grade 904L is less resistant to nitric acid than grades 304L and 310L, which are free of molybdenum. This steel grade needs to be solution treated following cold working, to achieve maximum stress corrosion cracking resistance under critical environments.
Chemical Composition of ASTM A240 TP 904L Stainless Steel Plates and Sheets
Chemistries per ASTM A240 and ASME SA-240:
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | Cu |
| 904L | min.max. | -0.02 | -2 | -1 | -0.045 | -0.035 | 1923 | 45 | 2328 | 12 |
Mechanical Properties of ASTM A240 TP 904L Stainless Steel Plates and Sheets The typical mechanical properties of grade 904L stainless steels are given in the table below:
Mechanical properties of grade 904L stainless steels
| Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness |
| Rockwell B (HR B) | Brinell (HB) |
| 904L | 490 | 220 | 36 | 70-90 typical | 150 |
Physical Properties of ASTM A240 TP 904L Stainless Steel Plates and Sheets
The physical properties of grade 904L stainless steels are tabulated below:
Typical physical properties of grade 904L stainless steels
| Grade | Density
(kg/m3) | Elastic Modulus
(GPa) | Mean Co-eff of Thermal Expansion (µm/m/°C) | Thermal Conductivity
(W/m.K) | Specific Heat 0-100°C
(J/kg.K) | Elec Resistivity
(nΩ.m) |
| 0-100°C | 0-315°C | 0-538°C | At 20°C | At 500°C |
| 904L | 7900 | 190 | 15 | - | - | 11.5 | - | 500 | 952 |
Grade Specification Comparison of ASTM A240 TP 904L Stainless Steel Plates and Sheets
The following table outlines the approximate grade comparisons of 904L stainless steels:
Grade specifications of grade 904L stainless steels
| Grade | UNS No | Old British | Euronorm | Swedish SS | Japanese JIS |
| BS | En | No | Name |
| 904L | N08904 | 904S13 | - | 1.4539 | X1NiCrMoCuN25-20-5 | 2562 | - |
Possible Alternative Grades of ASTM A240 TP 904L Stainless Steel Plates and Sheets The suitable alternatives to 904L stainless steels are tabulated below: Possible alternative grades to grade 904L stainless steels
| Grade | Reasons for choosing grade 904L |
| 316L | A lower cost alternative, but with much lower corrosion resistance. |
| 6Mo | A higher resistance to pitting and crevice corrosion is needed. |
| 2205 | A very similar corrosion resistance, with the 2205 having higher mechanical strength, and at a lower cost to 904L. (2205 not suitable for temperatures above 300°C.) |
| Super duplex | Higher corrosion resistance is needed, together with a higher strength than 904L.
|
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