Stainless Steel 420 Round Bars are high-strength martensitic stainless steel bars engineered for applications that demand hardness, wear resistance, and reliable mechanical performance. American Metallix Steel Co. manufactures premium quality SS 420 round bars designed for industrial fabrication, precision machining, and structural engineering environments where strength and durability are critical.
These stainless steel round bars are widely used in automotive components, pump shafts, surgical instruments, valves, and industrial tools. Known for their ability to achieve high hardness through heat treatment, Stainless Steel 420 Round Bars are ideal for applications that require resistance to abrasion along with moderate corrosion resistance. Their consistent dimensional accuracy and controlled metallurgical properties make them suitable for demanding engineering sectors worldwide.
Stainless Steel 420 is a martensitic stainless steel grade containing a higher carbon content compared to austenitic grades. The typical composition includes around 12 to 14 percent chromium with controlled carbon levels that enable the material to be hardened through heat treatment. The chromium content provides corrosion resistance, while the carbon enhances hardness and strength. Metallurgically, Stainless Steel 420 Round Bars transform into a martensitic structure when quenched and tempered. This heat treatment process significantly increases hardness and tensile strength, making the material suitable for high-wear applications. In the annealed condition, the bars offer good machinability, which improves further after proper heat treatment and finishing. These bars exhibit excellent tensile strength, high yield strength, and good fatigue resistance. They perform well in environments where mechanical stress and repeated loading are common. While their corrosion resistance is lower than 304 or 316 grades, Stainless Steel 420 Round Bars provide adequate protection in mildly corrosive environments such as atmospheric exposure, fresh water, and certain industrial settings.
One of the primary advantages of Stainless Steel 420 Round Bars is their exceptional hardness. After heat treatment, they achieve high surface hardness, making them ideal for cutting tools, shafts, and wear-resistant components. This strength allows them to withstand heavy mechanical loads and abrasive conditions. Durability is another key benefit. These stainless steel bars maintain structural integrity even under repetitive stress, making them suitable for dynamic mechanical systems. Their ability to resist deformation enhances the lifespan of components used in industrial machinery and equipment. Stainless Steel 420 Round Bars also offer good machinability in the annealed state. This allows manufacturers to produce precision parts with tight tolerances before hardening. From a cost perspective, 420 grade provides a practical balance between performance and affordability, especially for applications where extreme corrosion resistance is not the primary requirement.
In tool manufacturing and heavy machinery, Stainless Steel 420 Round Bars Manufacturers supply hardened bars used in cutting tools, surgical instruments, industrial blades, and measuring equipment. The material’s high hardness and wear resistance ensure consistent performance in precision tools and mechanical assemblies. For pump and valve industries, Stainless Steel 420 Round Bars Suppliers provide bar stock used in shafts, valve stems, and fasteners that operate under mechanical stress. These components require strength and moderate corrosion resistance to function effectively in industrial fluid systems.
In general engineering and fabrication sectors, Stainless Steel 420 Round Bars Stockists maintain ready inventory for manufacturing automotive parts, fasteners, and structural connectors. Quick availability of different diameters supports maintenance projects, plant upgrades, and custom fabrication needs. Across international markets, Stainless Steel 420 Round Bars Exporters deliver precision-engineered bars for use in power plants, oil and gas equipment, and industrial processing systems. Proper certification and compliance with global standards ensure reliability and consistent quality for overseas buyers.
Stainless Steel 420 Round Bars are commonly manufactured according to ASTM A276 and ASTM A479 specifications, which cover stainless steel bars and shapes for general engineering and pressure vessel applications. For boiler and high-temperature service, the corresponding ASME standards include ASME SA276 and ASME SA479. These standards define chemical composition limits, mechanical properties, heat treatment requirements, and dimensional tolerances. Compliance with ASTM and ASME ensures that SS 420 round bars meet strict quality benchmarks for industrial fabrication, pressure equipment, and structural engineering applications.
Steel products such as round bars, pipes, tubes, plates, sheets, and coils are named and classified based on international standards including ASTM, ASME, EN, DIN, JIS, and ISO. ASTM and ASME standards are widely used for industrial piping systems, pressure vessels, and structural components in North America and global markets. EN and DIN standards define European material grades and mechanical properties, while JIS governs Japanese industrial specifications. ISO provides unified testing and quality management frameworks. Stainless Steel 420 is identified by its martensitic composition and performance characteristics, ensuring accurate material selection for engineering, fabrication, and industrial processing requirements worldwide.
American Metallix Steel Co. is one of the leading manufacturer and supplier of Stainless Steel Round Bars, including hot rolled, cold drawn, polished, and bright bar variants, offering consistent quality at competitive prices.
Request Latest Price & Stock AvailabilityStainless Steel 420 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 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. |
Stainless Steel 420 Round Bars can be supplied in standard or custom-cut lengths, dimensions, finishes and forms according to specific project requirements.
The chemical composition of Stainless Steel 420 Round Bars includes controlled amounts of carbon, manganese, silicon, phosphorus, sulfur and chromium for dependable industrial performance.
| Grade | C | Mn | Si | P | S | Cr | Ni |
|---|---|---|---|---|---|---|---|
| 420 | 0.15 max | 1.00 max | 1.00 max | 0.04 max | 0.03 max | min: 12.0 max: 14.0 |
— |
C: Carbon, Mn: Manganese, Si: Silicon, P: Phosphorus, S: Sulfur, Cr: Chromium and Ni: Nickel. All listed values represent percentage by weight unless otherwise specified.
The mechanical properties of Stainless Steel 420 Round Bars indicate their tensile strength, yield strength, elongation and hardness at different tempering temperatures.
| Tempering Temperature (°C) | Tensile Strength (MPa) | Yield Strength 0.2% Proof (MPa) |
Elongation (% in 50mm) |
Hardness Brinell (HB) |
|---|---|---|---|---|
| Annealed * | 655 | 345 | 25 | 241 max |
| 399°F (204°C) | 1600 | 1360 | 12 | 444 |
| 600°F (316°C) | 1580 | 1365 | 14 | 444 |
| 800°F (427°C) | 1620 | 1420 | 10 | 461 |
| 1000°F (538°C) | 1305 | 1095 | 15 | 375 |
| 1099°F (593°C) | 1035 | 810 | 18 | 302 |
| 1202°F (650°C) | 895 | 680 | 20 | 262 |
* Annealed tensile properties are typical for Condition A of ASTM A276; annealed hardness is the specified maximum.
