Do you want to attach pipes, valves, pumps, and different device? If yes, what your piping system desires is a flange to provide structural integrity, ease of renovation, and reliable leak-evidence sealing.
Among the various flanges available the maximum normally used is the 904L Stainless Steel Flange. Now, you must understand that considering this vital piping factor is made from SS 904L Stainless Steel it gives superior corrosion resistance and extraordinary mechanical homes.
Hence we at Metaforgeindia a leading 904L Stainless Steel Flange Manufacturer in India present to you this blog explaining everything you need to know about UNS N08904 Flange that includes its chemical, physical properties and applications.
What is the SS 904L Stainless Steel Flange?
A 904L Stainless Steel Flange is a high-alloy austenitic stainless-steel flange meant for remarkable corrosion resistance in antagonistic environments. Classified underneath UNS N08904, SS 904L is a non-stabilized grading that gives first rate resistance to pitting, crevice corrosion, and pressure corrosion cracking, way to its excessive nickel, molybdenum, and copper content.
These flanges are produced in various standards, with ASTM B625 904L Flanges being the most overall recognized for industrial use. Due to their unique chemical makeup, 904L flanges are a preferred choice where standard stainless steels like 304 or 316 may fail.
Chemical Composition of SS 904L Flanges
The composition of SS 904L gives it extraordinary resistance to harsh controls. Here’s the typical chemical makeup as per ASTM B625 standards:
| Element | Percentage (%) |
| Carbon (C) | ≤ 0.020 |
| Nickel (Ni) | 23 – 28 |
| Chromium (Cr) | 19 – 23 |
| Molybdenum (Mo) | 4 – 5 |
| Copper (Cu) | 1 – 2 |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulphur (S) | ≤ 0.035 |
| Iron (Fe) | Balance |
The high nickel and molybdenum contents enhance chloride resistance, while copper raises resistance to reducing acids like sulfuric acid.
Key Specifications of 904L Stainless Steel Flanges:
SS 904L flanges are chosen for projects where performance and longevity matter most. Some fundamental characteristics join:
1. Uncommon Corrosion Resistance
Outstanding resistance to a wide variety of corrosive media.
Fantastic resistance to chloride-induced pitting and crevice corrosion.
Top performance in reducing environments containing sulfuric, phosphoric, and acetic acids.
2. High Capital & Durability
Tensile Asset: ~490 MPa (71 ksi)
Yield Asset: ~220 MPa (32 ksi)
Maintains structural integrity under high pressure and temperature fluctuations.
3. Favourable Weldability & Fabrication
Can become welded using most conventional ways.
Low carbon content minimizes carbide precipitation during welding.
4. Temperature Resistance
Performs appropriately in both high-temperature and cryogenic environments.
Standard 904L Flange Range
904L Flange Size vary grounded on the flange type (Slip-On, Weld Neck, Blind, Socket Weld, Threaded, Lap Joint) and standard (ANSI/ASME B16.5, DIN, EN, JIS).
Casual size range:
Nominal Pipe Size (NPS): ½” to 48”
Pressure Ratings: Class 150, 300, 600, 900, 1500, 2500
Face Types: Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ)
Dimensions are critical for faultless fit and sealing, and reputable 904L Flange Exporters monitor strict international standards.
904L Flange Price Range
There are certain factors that determine 904L Flange Price. They include size, pressure class, type, quantity, and finish. Due to the Premium Quality of the 904L Stainless Steel Flange.
Grades like 304L or 316L are high priced. However, due to their longer shelf-life and lesser maintenance cost they prove to be price effective.
Typical price range (indicative, subject to market fluctuations):
Small Sizes (½” – 2”): USD $20 – $50 per piece
Medium Sizes (3” – 12”): USD $60 – $200 per piece
Great Sizes (14” – 48”): Custom quoted built on weight and material cost.
So, if you are looking to ‘Place an Order’ for an UNS N08904 Flange in bulk quantity visit Metalforgeindia today ‘To Get Quote’ for a package at an affordable 904L Flange Price.
