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Stainless Steel 304/304L Round Bar is the most widely used austenitic stainless steel, known for its outstanding corrosion resistance and excellent mechanical properties. It contains a balanced composition of chromium and nickel, which enhances its strength, formability, and resistance to oxidation. Stainless Steel 304/304L Round Bar performs efficiently in both ambient and mildly corrosive environments. The “L” variant signifies low carbon content, which helps prevent carbide precipitation during welding. This alloy is widely used in industrial, architectural, and domestic applications.
The chemical composition of Stainless Steel 304/304L Round Bar includes around 18–20% chromium and 8–12% nickel, providing superior resistance to corrosion and oxidation. The lower carbon content in 304L minimizes intergranular corrosion, especially after welding or heat exposure. Stainless Steel 304/304L Round Bar resists rusting and scaling in atmospheric and chemical environments. It performs well in freshwater, food processing, and mild acidic conditions. This grade is a popular choice for long-term use in environments that demand strength and cleanliness.
Stainless Steel 304/304L Round Bar exhibits excellent tensile and yield strength, along with high ductility and toughness. It remains non-magnetic in the annealed condition but may become slightly magnetic after cold working. The alloy offers superior formability and weldability without the need for preheating or post-weld treatment. Stainless Steel 304/304L Round Bar retains its mechanical stability across a wide temperature range. Its combination of durability and ease of fabrication makes it one of the most versatile materials in the stainless steel family.
One of the major advantages of Stainless Steel 304/304L Round Bar is its superior resistance to a wide variety of corrosive media. It performs well in environments containing organic acids, alkalis, and chloride-free solutions. The alloy maintains a smooth, polished surface finish that resists contamination and is easy to clean. Stainless Steel 304/304L Round Bar is widely used in industries where hygiene is crucial, such as food processing, beverage, and pharmaceuticals. Its ability to resist staining and pitting ensures long-lasting aesthetic and functional appeal.
Stainless Steel 304/304L Round Bar can be easily fabricated using standard techniques, including machining, forming, and welding. It offers excellent machinability and can be hot or cold worked to achieve desired mechanical properties. The low carbon content in 304L prevents sensitization, allowing it to be used in heavy-gauge welded components. Stainless Steel 304/304L Round Bar is available in various finishes, including bright, polished, and ground, to meet specific industry requirements. Its versatility makes it suitable for both structural and decorative applications.
Applications of Stainless Steel 304/304L Round Bar include chemical equipment, heat exchangers, architectural components, pressure vessels, and marine fittings. It is also widely used in kitchen equipment, dairy machinery, and food processing units due to its hygienic surface properties. Stainless Steel 304/304L Round Bar performs exceptionally well in environments where cleanliness and corrosion resistance are essential. It offers excellent service life, reducing maintenance costs and downtime. Its balance of mechanical and corrosion-resistant properties ensures consistent performance in diverse conditions.
In conclusion, Stainless Steel 304/304L Round Bar remains one of the most popular and versatile materials in industrial and commercial applications. Its excellent corrosion resistance, weldability, and formability make it a top choice across multiple sectors. Stainless Steel 304/304L Round Bar provides reliable performance in both oxidizing and mildly corrosive environments. Its cost-effectiveness and aesthetic appeal further enhance its value. Overall, this alloy offers a perfect blend of durability, strength, and corrosion protection suitable for a wide range of uses.
Specification Table
| Property | 304 | 304L | Unit |
|---|---|---|---|
| Density | 8.00 | 8.00 | g/cm³ |
| Melting Point | 1400-1450 | 1400-1450 | °C |
| Yield Strength (0.2% Offset) | 215 | 170 | MPa |
| Tensile Strength | 505 | 485 | MPa |
| Elongation | 40 | 40 | % |
| Hardness (Brinell) | 123 | 123 | HB |
| Temperature Resistance | 870 (continuous) | 870 (continuous) | °C |
| Corrosion Resistance | Excellent | Excellent | - |
| Common Applications | Pipes, Tanks, Automotive, Food Processing | Pipes, Tanks, Chemical, Food Industry | - |
Chemical Composition (Typical ranges for SS304/304L)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | 304 (%) | 304L (%) |
|---|---|---|
| Carbon (C) | 0.08 max | 0.03 max |
| Chromium (Cr) | 18.0 - 20.0 | 18.0 - 20.0 |
| Nickel (Ni) | 8.0 - 10.5 | 8.0 - 12.0 |
| Manganese (Mn) | 2.0 max | 2.0 max |
| Silicon (Si) | 1.0 max | 1.0 max |
| Phosphorus (P) | 0.045 max | 0.045 max |
| Sulfur (S) | 0.03 max | 0.03 max |
| Nitrogen (N) | 0.10 max | 0.10 max |
| Iron (Fe) | Balance | Balance |
Mechanical Properties (Typical)
| Property | 304 | 304L | Unit |
|---|---|---|---|
| Yield Strength (0.2% Offset) | 215 | 170 | MPa |
| Tensile Strength | 505 | 485 | MPa |
| Elongation at Break | 40 | 40 | % |
| Hardness (Brinell) | 123 | 123 | HB |
| Modulus of Elasticity | 193 | 193 | GPa |
| Poisson's Ratio | 0.27 | 0.27 | - |
| Fatigue Strength | 240 | 220 | MPa |
| Impact Toughness (Charpy) | 50 | 50 | J |
Equivalent Grades
| Standard | 304 | 304L |
|---|---|---|
| AISI / ASTM | 304 | 304L |
| EN / DIN | 1.4301 | 1.4306 |
| JIS | SUS 304 | SUS 304L |
| GB / China | 06Cr19Ni10 | 06Cr19Ni10L |
| ISO | X5CrNi18-10 | X2CrNi18-9 |
| Others | UNS S30400 | UNS S30403 |
Dimension & Weight Chart (Selected common sizes)
Below is a representative chart showing outside diameter, wall thickness, inside diameter, cross-sectional area of metal and calculated weight per metre (kg/m). Values are calculated using density = 7.93 g/cm³ and are for guidance — use actual MTC values for procurement & engineering.
| Diameter (mm) | Weight per meter (kg/m) | Diameter (inch) | Weight per foot (lb/ft) |
|---|---|---|---|
| 6 | 0.222 | 0.236 | 0.148 |
| 8 | 0.395 | 0.315 | 0.263 |
| 10 | 0.617 | 0.394 | 0.411 |
| 12 | 0.888 | 0.472 | 0.591 |
| 16 | 1.580 | 0.630 | 1.05 |
| 20 | 2.470 | 0.787 | 1.64 |
| 25 | 3.850 | 0.984 | 2.55 |
| 32 | 6.310 | 1.260 | 4.18 |
| 40 | 9.860 | 1.575 | 6.52 |
| 50 | 15.40 | 1.969 | 10.2 |
| 65 | 25.10 | 2.559 | 16.6 |
| 80 | 39.30 | 3.150 | 26.0 |
| 100 | 61.40 | 3.937 | 40.7 |
Types Of 304/304L Round Bars and Tubes
Stainless Steel Round Bar
Monel 400 K400 Round Bar
Hastelloy Round Bar
Inconel 600 Round Bar
Nickel Alloy Round Bar
Super Duplex Round Bar
Monel K500 Round Bar
Inconel 625 Round Bar
Frequently Asked Questions (FAQ)
What is Stainless Steel 304/304L?
Stainless Steel 304 is an austenitic stainless steel known for its excellent corrosion resistance, mechanical strength, and versatility. 304L is a low-carbon version of 304, which reduces the risk of carbide precipitation during welding.
What are the key differences between 304 and 304L?
The primary difference is carbon content: 304L has a lower carbon content (0.03% max) than 304 (0.08% max). This makes 304L more suitable for welding and reduces the risk of intergranular corrosion.
What are the common applications of SS 304/304L Round & Bar?
They are widely used in chemical, food processing, pharmaceutical, marine, construction, and automotive industries, including tanks, pipes, structural components, and equipment exposed to corrosive environments.
What sizes are available for 304/304L Round & Bar?
They are available in a variety of diameters and lengths, typically ranging from 6mm to 100mm or more, as per standard industrial specifications.
Can SS 304/304L be welded?
Yes, both 304 and 304L are weldable. 304L is preferred for welding applications due to its lower carbon content, which minimizes carbide precipitation and intergranular corrosion.
What is the corrosion resistance of SS 304/304L?
Both 304 and 304L exhibit excellent corrosion resistance against a wide range of chemicals and atmospheric conditions. 304L performs slightly better in welded structures exposed to corrosive environments.
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