Stainless Steel 431 Round Bars are high-strength martensitic stainless steel bars widely used in engineering applications where a combination of mechanical strength and moderate corrosion resistance is required. Steel Icon Stainless Pvt. Ltd. manufactures precision-engineered SS 431 round bars designed for demanding industrial environments including power generation, marine components, fastener production, and structural engineering projects.
These stainless steel round bars are known for their ability to achieve high tensile strength through heat treatment while maintaining good resistance to atmospheric corrosion and mild chemical exposure. Stainless Steel 431 Round Bars are commonly selected for shafts, pump components, bolts, studs, and high-load mechanical parts that require toughness and durability under continuous stress.
Stainless Steel 431 is a martensitic stainless steel grade containing chromium and nickel as primary alloying elements. The typical chemical composition includes approximately 15 to 17 percent chromium and 1.25 to 2.5 percent nickel, along with controlled carbon content to support heat treatment and strength enhancement. This composition allows the material to be hardened and tempered to achieve superior mechanical properties. The metallurgical structure of Stainless Steel 431 Round Bars is martensitic after heat treatment, which contributes to high strength and hardness levels. Compared to austenitic grades such as 304 or 316, SS 431 offers significantly higher tensile strength and yield strength. It maintains good toughness in hardened and tempered conditions and delivers reliable performance in applications requiring wear resistance and structural stability. These bars exhibit good corrosion resistance in atmospheric conditions, fresh water, and mild industrial environments. While not as corrosion resistant as 300 series stainless steels, Stainless Steel 431 Round Bars provide a balanced performance profile where mechanical strength is the primary requirement. They can be machined in the annealed condition and subsequently heat treated to achieve the desired hardness and strength.
One of the key advantages of Stainless Steel 431 Round Bars is their high mechanical strength after heat treatment. This makes them ideal for components exposed to heavy loads, rotational stress, and impact forces. The ability to achieve excellent tensile properties allows engineers to design compact yet strong components for industrial machinery and structural assemblies. Corrosion resistance is another important benefit. SS 431 round bars perform well in mildly corrosive environments, including industrial atmospheres and marine settings with limited chloride exposure. The chromium content forms a protective oxide layer that reduces rust formation and surface degradation over time. Stainless Steel 431 Round Bars also offer good fatigue resistance and wear resistance, which is essential for shafts, spindles, and fasteners subjected to repetitive motion. Their machinability in the annealed condition supports efficient fabrication and cost-effective production. When compared to other high-strength alloys, SS 431 provides a practical balance between performance and affordability, making it suitable for long-term industrial use.
In heavy engineering and rotating equipment manufacturing, Stainless Steel 431 Round Bars Manufacturers supply hardened and tempered bars for pump shafts, motor shafts, and turbine components. The high strength and fatigue resistance of this grade ensure reliable operation in power plants and industrial machinery. Within the marine and shipbuilding sector, Stainless Steel 431 Round Bars Suppliers provide corrosion-resistant bars used for propeller shafts, fasteners, and structural fittings exposed to marine atmospheres. The combination of strength and moderate corrosion resistance makes SS 431 suitable for such demanding environments.
For infrastructure and construction projects, Stainless Steel 431 Round Bars Stockists maintain ready inventory for structural supports, anchor bolts, and high-strength fasteners used in bridges, industrial plants, and mechanical frameworks. Consistent dimensional accuracy and heat-treated options support efficient installation and long service life. In global industrial markets, Stainless Steel 431 Round Bars Exporters deliver certified stainless steel bars for use in oil and gas equipment, chemical processing systems, and specialized engineering components. Proper testing, certification, and export-grade packaging ensure compliance with international quality requirements.
Stainless Steel 431 Round Bars are commonly produced in accordance with ASTM A276, which covers stainless steel bars and shapes for general use, and ASTM A479 for bars intended for use in boilers and pressure vessels. The corresponding ASME specifications include ASME SA276 and ASME SA479 for applications involving pressure equipment and high-temperature service. These standards define chemical composition limits, mechanical property requirements, heat treatment conditions, and dimensional tolerances. Compliance with ASTM and ASME standards ensures that SS 431 round bars meet stringent quality benchmarks for industrial fabrication, power plants, and mechanical engineering projects.
Steel products such as round bars, pipes, tubes, plates, sheets, and coils are classified under international standards including ASTM, ASME, EN, DIN, JIS, and ISO. Each standard defines grade designations, chemical composition, mechanical properties, and testing methods. For example, ASTM and ASME standards are widely used in North America for pressure vessels and industrial piping systems, while EN and DIN standards apply across Europe. JIS standards govern Japanese industrial materials, and ISO ensures harmonized testing and quality management practices worldwide. Stainless steel grades like 431 are identified by their alloy composition and performance characteristics, enabling engineers and procurement teams to specify appropriate materials for fabrication, structural engineering, chemical processing equipment, and power generation systems.
American Metallix Steel Co.is one of the leading manufacturer and supplier of 431 Stainless Steel ASTM A276 Round Bar, SS 431 ASME SA 276 Polished Bar, 431 SS Black Bar, 431 Stainless Steel Rods, ASTM A276 SUS 431 Round Bar, ASME SA 276 431 Bar, Round Bar, Hex Bar at the best price in India.
Request Latest Price & Stock AvailabilityStainless Steel 431 Round Bars are available in various dimensions, finishes, lengths and forms. Review the complete 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 Milimeter | 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 Milimeter | 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 Milimeter | 1/2” to 10” in thickness range of 2mm to 150mm |
| Form | Round, Square, Hex (A/F), Rectangle, Billet, Ingot, Forging Etc. |
Stainless Steel 431 Round Bars can be supplied in standard or custom-cut lengths, multiple finishes, and various forms according to specific project requirements.
The chemical composition of Stainless Steel 431 Round Bars consists of carefully controlled levels of carbon, manganese, silicon, phosphorus, sulfur, chromium and nickel to provide excellent corrosion resistance, high hardness, strength and superior mechanical performance.
| Grade | C | Mn | Si | P | S | Cr | Ni |
|---|---|---|---|---|---|---|---|
| 431 | 0.20 max | 1.00 max | 1.00 max | 0.040 max | 0.030 max | 15.00 - 17.00 | 1.25 - 2.50 |
C: Carbon, Mn: Manganese, Si: Silicon, P: Phosphorus, S: Sulfur, Cr: Chromium and Ni: Nickel. All values shown represent the specified percentage by weight for Stainless Steel 431 Round Bars.
The mechanical properties of Stainless Steel 431 Round Bars vary according to tempering temperature. The values below include tensile strength, yield strength, elongation, hardness and impact resistance.
|
Tempering Temperature (°C) |
Tensile Strength (MPa) |
Yield Strength 0.2% Proof (MPa) |
Elongation (% in 50mm) |
Hardness Brinell (HB) |
Impact Charpy V (J) |
|---|---|---|---|---|---|
| Annealed * | 862 | 655 | 20 | 285 max | – |
| 204 | 1345 | 1055 | 20 | 388 | 50 |
| 316 | 1295 | 1035 | 19 | 375 | 53 |
| 427 | 1350 | 1080 | 19 | 388 | # |
| 538 | 1140 | 965 | 19 | 321 | # |
| 593 | 1015 | 770 | 20 | 293 | 64 |
| 650 | 960 | 695 | 20 | 277 | 84 |
These values show how different tempering temperatures affect the strength, elongation, hardness and impact performance of Stainless Steel 431 Round Bars. Values may vary according to dimensions, condition and applicable manufacturing standards.
