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Product Overview
Introduction To Alloy 904L / UNS N08904 / 1.4539
MOKSH TUBES & FITTINGS LLP is a leading manufacturer, supplier, exporter, importer, and stockist of premium-grade Alloy 904L (UNS N08904) products, including Pipes & Tubes, Pipe Fittings, Flanges, Sheets, Plates, Coils, Bars, Wire, and Custom Fabricated Components.
Alloy 904L is a high-alloy austenitic stainless steel developed for exceptional corrosion resistance in harsh environments. With elevated levels of chromium, nickel, molybdenum, and added copper, 904L offers superior resistance to sulfuric, phosphoric, and acetic acids, as well as chloride-induced pitting and crevice corrosion. Originally developed for the chemical industry, it also performs excellently in marine and offshore applications. This non-stabilized, low-carbon alloy offers excellent formability, weldability, and toughness across a wide temperature range.
Chemical Composition
| Element | Composition (%) |
|---|---|
| Nickel | 23.0 – 28.0 |
| Chromium | 19.0 – 23.0 |
| Carbon | 0.02 max |
| Silicon | 1.0 max |
| Manganese | 2.0 max |
| Molybdenum | 4.0 – 5.0 |
| Phosphorus | 0.045 max |
| Sulfur | 0.035 max |
| Iron | Balance |
Technical Composition
Physical Properties
| Property | Imperial | Metric |
|---|---|---|
| Density | 0.289 lb/in³ | 8.00 g/cm³ |
| Melting Point | 2475 – 2550 °F | 1357 – 1399 °C |
| Modulus of Elasticity – Tension | 28.0 × 10³ ksi | 193 GPa |
| Modulus of Elasticity – Compression | 28.0 × 10³ ksi | 193 GPa |
| Modulus of Elasticity – Torsion | 10.0 × 10³ ksi | 69 GPa |
| Poisson’s Ratio | 0.30 | — |
| Curie Temperature | Not typically applicable | Not typically applicable |
Mechanical Properties
| Property | Annealed | Cold Worked | Solution Treated |
|---|---|---|---|
| Tensile Strength (ksi / MPa) | 75–95 ksi / 520–655 MPa | 85–110 ksi / 585–760 MPa | 75–95 ksi / 520–655 MPa |
| Yield Strength (0.2%) (ksi / MPa) | 30–50 ksi / 205–345 MPa | 55–85 ksi / 380–585 MPa | 30–55 ksi / 205–380 MPa |
| Elongation (%) | 30–55% | 15–30% | 30–55% |
| Hardness (Rockwell B / C) | 70–90 B | 85–95 B | 75–90 B |
| Brinell Hardness (HB) | 150–200 HBB | 180–230 HB | 150–200 HB |
Products in Alloy 904L
Alloy 904L is commonly supplied as:
We supply Alloy 904L materials in accordance with the most stringent industry standards:
Uses and Advantages
Exceptional resistance to strong reducing acids (especially sulfuric acid)
Superior pitting and crevice corrosion resistance in chloride media
Excellent toughness and ductility at both low and high temperatures
Fully austenitic structure provides excellent formability and weldability
Non-magnetic and low carbon content prevents intergranular corrosion
Applications of Alloy 904L
Alloy 904L is designed for use in high-temperature, high-stress, and highly oxidizing environments. Its unique combination of strength, oxidation resistance, and formability makes it suitable for:
Marine Engineering & Offshore
Used in seawater cooling systems, ballast water systems, and marine equipment for outstanding resistance to chloride stress corrosion and crevice attack.
Chemical & Petrochemical Processing
Ideal for equipment handling sulfuric, phosphoric, and acetic acids such as heat exchangers, reactors, tanks, and process vessels.
Oil & Gas Industry
Preferred for piping systems, separators, heat exchangers, and offshore platforms due to resistance in sour service and aggressive environments.
Pulp & Paper Industry
Used in bleaching and chemical recovery areas where resistance to acidic compounds is essential.
Desalination & Water Treatment
Excellent choice for evaporators, condenser tubes, and brine heaters in high-salinity environments.
Pharmaceutical & Food Industry
Used in clean-in-place systems and high-purity fluid processing due to its hygienic, corrosion-resistant properties.
WHY CHOOSE US?
FAQ's
What is Alloy 904L stainless steel and what makes it special?
Alloy 904L (UNS N08904) is a premium-grade austenitic stainless steel designed for exceptional corrosion resistance in aggressive environments. With a high content of chromium, nickel, molybdenum, and added copper, it provides outstanding resistance to sulfuric, phosphoric, and acetic acids, as well as chloride induced pitting and crevice corrosion. Its low carbon content prevents intergranular corrosion while ensuring excellent toughness, weldability, and formability.
What Alloy 904L products does Moksh Tubes & Fittings LLP offer?
Moksh Tubes & Fittings LLP supplies a complete range of Alloy 904L products including seamless and welded pipes, capillary and U-bend tubes, boiler and heat exchanger tubes, sheets, plates, coils, strips, round bars, hex bars, square bars, flanges, pipe fittings, fasteners, wire, and custom-fabricated components. All products meet international standards and are available in various sizes and dimensions for industrial applications.
What are the main advantages of using Alloy 904L?
Alloy 904L provides superior resistance to strong reducing acids, particularly sulfuric acid, making it highly reliable in chemical and industrial processes. It resists pitting and crevice corrosion in chloride rich environments, maintains excellent toughness at both low and high temperatures, and is fully austenitic with excellent weldability and formability. Being non-magnetic with a low carbon content, it also minimizes the risk of intergranular corrosion, ensuring long service life.
Which industries commonly use Alloy 904L materials?
Alloy 904L is widely used across multiple industries such as marine engineering and offshore equipment, chemical and petrochemical processing, oil and gas production, pulp and paper processing, desalination and water treatment plants, pharmaceutical systems, and food industry equipment. Its ability to withstand strong acids, chloride rich seawater, and aggressive industrial chemicals makes it a preferred choice for critical applications.
Why choose Moksh Tubes & Fittings LLP for Alloy 904L supply?
Moksh Tubes & Fittings LLP is a trusted manufacturer, supplier, and exporter of high quality Alloy 904L products with in-house testing, mill test certification, and complete traceability. The company offers custom sizes, quick delivery, and global export capabilities to meet client requirements. With extensive industry experience and a strong reputation in marine, chemical, and oil & gas sectors, Moksh Tubes & Fittings LLP ensures reliable supply and superior product performance.