Hemi Metals, located in Hamilton, New Zealand, is a reliable manufacturer and supplier of high-quality Stainless Steel 904L Flat Bars, specifically designed for tough industrial environments that are highly corrosive and chemically aggressive. SS 904L is a super austenitic stainless steel celebrated for its outstanding resistance to acids, chlorides, and stress corrosion cracking. With a focus on precise dimensions, a smooth surface finish, and rigorous quality control, these flat bars promise long-lasting durability and consistent mechanical performance. Hemi Metals caters to various industries, including chemical processing, pharmaceuticals, marine, power generation, and heavy engineering, where top-notch corrosion resistance is essential.
Stainless Steel 904L is made up of about 19–23% chromium, 23–28% nickel, 4–5% molybdenum, and 1–2% copper, all while keeping carbon content low. This distinctive alloy composition grants it remarkable resistance to sulfuric acid, chlorides, and pitting corrosion. Typically, SS 904L flat bars boast a tensile strength of around 490 MPa and a yield strength close to 220 MPa, along with impressive ductility and impact toughness. The material is non-magnetic, offers excellent weldability, and maintains stable mechanical performance even in highly corrosive settings.
| Standard | ASTM B649, ASME SB649 |
| Round Bar Size | 3mm~ 800mm |
| Square Bar Size | 4mm* 4mm ~100mm* 100mm |
| Flat Bar Size | 2mm ~ 100mm |
| Hex Bar Size | 2mm ~ 100mm |
| Angle Size | 3mm* 20mm* 20mm~ 12mm* 100mm* 100mm |
| Thickness | 50 mm to 6000 mm Long |
| Length | 1 To 6 Meters, Custom Cut Length |
| Form | Round, Square, Hex(A/F), Rectangle, Billet, Ingot, Forging Etc |
| Grade | Ni | Mo | Cr | Cu | C | Mn | Si | P | S |
| 904L | 23 – 28 | 4 – 5 | 19 – 23 | 1 – 2 | 0.02 max | 2.0 max | 1.0 max | 0.045 max | 0.035 max |
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 8.05 g/cm3 | 1350 °C (2460 °F) | Psi – 71000 , MPa – 490 | Psi – 32000 , MPa – 220 | 35 % |
| STANDARD | WERKSTOFF NR. | UNS | AFNOR | JIS | BS | KS | EN |
| 904L | 1.4539 | N08904 | Z2NCUD31-20AZ | SUS 890L | 904S13 | STS 317J5L | X1NiCrMoCu25-20-5 |
Stainless Steel 904L Flat Bar is widely used in chemical processing, oil and gas, marine, pharmaceutical, and pulp and paper industries due to its exceptional corrosion resistance, particularly in acidic, chloride-rich, and high-stress environments.
Stainless Steel 904L offers superior corrosion resistance compared to standard austenitic stainless steels, excelling in harsh environments with strong acids (sulfuric, phosphoric) and chloride exposure, due to its high nickel, chromium, and molybdenum content, reducing pitting and stress corrosion.
Yes, Stainless Steel 904L Flat Bar is highly suitable for marine environments due to its excellent resistance to chloride-induced pitting, crevice corrosion, and stress corrosion cracking, making it ideal for shipbuilding, seawater equipment, and coastal structural applications.
Stainless Steel 904L Flat Bars find extensive use in industries where extreme corrosion resistance and long-lasting reliability are non-negotiable. They are commonly utilized in chemical processing equipment, heat exchanger frames, acid handling systems, pressure vessels, and structural supports. In the pharmaceutical and food sectors, SS 904L flat bars are essential for high-purity processing equipment and hygienic installations. Additionally, they are employed in offshore platforms, desalination plants, pollution control systems, and marine structures. Their exceptional resistance to acids, chlorides, and harsh chemicals guarantees safe, durable, and maintenance-free performance in the most challenging industrial environments.
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
Hemi Metals is a leading manufacturer, supplier, and exporter of high-quality bars, rods, and forgings, catering to various industries in Hamilton New Zealand
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