Stainless Steel 904L Round Bars are high-alloy austenitic stainless steel products developed for extreme corrosion resistance and superior performance in aggressive industrial environments. Steel Icon Stainless Pvt. Ltd. manufactures premium quality SS 904L round bars designed for critical applications in chemical processing plants, offshore structures, oil refineries, and power generation facilities. These round bars are widely preferred in industries where exposure to strong acids, high temperatures, and chloride-rich conditions demands exceptional material reliability.
Engineers and procurement specialists choose Stainless Steel 904L Round Bars for components that must deliver consistent mechanical strength and corrosion protection over long service periods. From heavy-duty shafts and fasteners to structural supports and pressure equipment parts, these bars are built to withstand challenging operational environments while maintaining structural integrity.
Stainless Steel 904L is a non-stabilized, low carbon, high alloy austenitic stainless steel containing significant amounts of chromium, nickel, molybdenum, and copper. The high nickel content improves resistance to stress corrosion cracking, while molybdenum enhances protection against pitting and crevice corrosion. Copper is added to increase resistance to reducing acids such as sulfuric acid. Metallurgically, Stainless Steel 904L Round Bars possess a fully austenitic structure that ensures excellent toughness, even at low temperatures. The low carbon composition reduces the risk of carbide precipitation during welding, which helps maintain corrosion resistance in welded assemblies. These bars demonstrate high tensile strength, reliable yield strength, and outstanding elongation, making them suitable for both structural and mechanical engineering applications. The material performs exceptionally well in harsh chemical environments, including exposure to phosphoric, sulfuric, and organic acids. It also offers strong resistance to oxidation at elevated temperatures. Due to its balanced mechanical and corrosion-resistant properties, Stainless Steel 904L Round Bars are widely used in pressure vessels, heat exchangers, and industrial piping systems.
One of the key advantages of Stainless Steel 904L Round Bars is their superior corrosion resistance in highly aggressive conditions. They outperform many standard stainless steel grades in environments with high chloride concentrations and acidic media. This makes them ideal for offshore platforms, desalination plants, and chemical reactors. These round bars provide excellent durability and long service life, reducing maintenance requirements and replacement costs. Their high strength supports heavy loads in structural engineering applications, while their resistance to stress corrosion cracking ensures safety in pressure equipment and high-temperature processing units.
Despite being a high-alloy material, Stainless Steel 904L Round Bars offer good fabrication characteristics. They can be machined, welded, and formed using standard stainless steel processing techniques. Although machining requires appropriate tooling due to the alloy content, the long-term performance and corrosion resistance deliver strong cost efficiency for critical industrial operations.
In the chemical and petrochemical sector, Stainless Steel 904L Round Bars Manufacturers supply corrosion-resistant bars for reactors, agitator shafts, and acid handling systems exposed to aggressive chemicals. The alloy’s resistance to sulfuric and phosphoric acids ensures safe and reliable plant operations. For offshore and marine engineering projects, Stainless Steel 904L Round Bars Suppliers provide materials used in seawater cooling systems, marine fasteners, and structural components subjected to high salinity conditions. The enhanced pitting resistance protects critical assemblies from premature failure.
Within heavy industrial fabrication and maintenance sectors, Stainless Steel 904L Round Bars Stockists maintain ready inventory for custom machining of pump shafts, valve stems, and pressure vessel components. Immediate availability supports shutdown maintenance and urgent project requirements in refineries and power plants. In global infrastructure and process industry markets, Stainless Steel 904L Round Bars Exporters deliver certified round bars to international clients for use in heat exchangers, flue gas desulfurization systems, and advanced industrial piping networks. Strict adherence to international standards ensures product reliability across diverse operating environments.
Stainless Steel 904L Round Bars are typically manufactured in accordance with ASTM A276 and ASTM A479 standards, which define requirements for stainless steel bars and shapes used in general engineering and pressure vessel applications. The corresponding ASME standards include ASME SA276 and ASME SA479 for use in boilers, heat exchangers, and pressure equipment. These specifications establish limits for chemical composition, mechanical properties, heat treatment, and dimensional tolerances. Compliance with these standards ensures that SS 904L round bars meet stringent quality benchmarks required in oil and gas plants, chemical processing facilities, and structural engineering projects.
Steel products such as round bars, pipes, tubes, plates, sheets, and coils are classified under globally recognized standards including ASTM and ASME in the United States, EN and DIN in Europe, JIS in Japan, and ISO for international harmonization. Each standard defines chemical composition, mechanical strength, surface finish, and testing procedures. Stainless Steel 904L may also be designated under EN numbers such as 1.4539. This standardized naming system allows engineers, fabricators, and procurement teams to accurately specify stainless steel long products, piping materials, and structural components for industrial fabrication, pressure equipment manufacturing, and large-scale infrastructure development.
American Metallix Steel Co. is one of the top manufacturers and suppliers of 904L Stainless Steel ASTM A276 Round Bar, SS 904L ASME SA 276 Polished Bar, 904L SS Black Bar, 904L Stainless Steel Rods, ASTM A276 SUS 904L Round Bar, ASME SA 276 904L Bar, Round Bar, Hex Bar at the best price in India.
Request Latest Price & Stock AvailabilityStainless Steel 904L Round Bars are available in multiple dimensions, forms, finishes and custom lengths. Review the technical specifications below for your industrial requirements.
| Specification | Details |
|---|---|
| ASTM Specifications | ASTM A276 / A479, ASME SA276 / A479 |
| Dimensions | EN, DIN, JIS, ASTM, BS, ASME, AISI |
| Hex Bars in Millimeter | 18mm – 57mm (11/16″ to 2-3/4″) |
| Round Bars Diameter | Outside Diameter in the range of 4mm to 500mm |
| Bright Bars Diameter | Outside Diameter in the range of 4mm to 100mm |
| Square Bars in Millimeter | 18mm – 47mm (11/16″ to 1-3/4″) |
| Finish | Black, Bright Polished, Rough Turned, NO.4 Finish, Matt Finish, BA Finish |
| Length | 1 to 6 Meters, Custom Cut Lengths |
| Flat Bars in Millimeter | 1/2″ to 10″ in thickness range of 2mm to 150mm |
| Form | Round, Square, Hex (A/F), Rectangle, Billet, Ingot, Forging Etc. |
Correct dimensions, finishes, forms and manufacturing standards help Stainless Steel 904L Round Bars deliver reliable performance in demanding industrial applications.
The chemical composition of Stainless Steel 904L Round Bars includes chromium, copper, manganese, molybdenum, nickel, phosphorus and sulfur in carefully controlled proportions.
| C | Cr | Cu | Mn | Mo | Ni | P | S |
|---|---|---|---|---|---|---|---|
| Max | Max | Max | Max | ||||
| 0.02 | 19.0–23.0 | 2.0 | 4.0–5.0 | 23.0–28.0 | 0.045 | 0.035 | 1.0 |
C: Carbon, Cr: Chromium, Cu: Copper, Mn: Manganese, Mo: Molybdenum, Ni: Nickel, P: Phosphorus and S: Sulfur. All listed values represent percentage by weight unless otherwise specified.
The mechanical properties of Stainless Steel 904L Round Bars indicate their tensile strength, yield strength, elongation and hardness under specified testing conditions.
| 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 |
Values may vary according to product condition, dimensions, heat treatment and applicable manufacturing standards. Confirm the required properties before final material selection.
