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Stainless Steel 304/304L Flat, Square, and Hex Bars are the most widely used stainless steel grades due to their excellent corrosion resistance, strength, and versatility. These bars are composed of chromium and nickel, which provide superior resistance to oxidation and a wide range of chemical environments. Stainless Steel 304/304L Flat, Square, and Hex Bars are suitable for both structural and decorative applications. They perform exceptionally well in atmospheric and mildly corrosive conditions. Their durability and ease of fabrication make them a popular choice across industries.
The chemical composition of Stainless Steel 304/304L Flat, Square, and Hex Bars includes approximately 18% chromium and 8% nickel, with a lower carbon content in the 304L grade. The low carbon version helps prevent carbide precipitation during welding, enhancing resistance to intergranular corrosion. Stainless Steel 304/304L Flat, Square, and Hex Bars are ideal for use in food processing, chemical, and marine applications. Their balanced composition ensures high performance in both oxidizing and reducing environments. These alloys are known for their stability and reliability.
Stainless Steel 304/304L Flat, Square, and Hex Bars possess excellent mechanical properties, including high tensile and yield strength with good elongation and hardness. They maintain strength and ductility even under varying thermal conditions. Stainless Steel 304/304L Flat, Square, and Hex Bars offer excellent toughness, even at sub-zero temperatures. Their mechanical stability makes them suitable for both load-bearing and precision engineering applications. These bars provide long-lasting strength and performance in a wide range of operating environments.
One of the standout features of Stainless Steel 304/304L Flat, Square, and Hex Bars is their excellent corrosion and oxidation resistance. They perform well in a variety of atmospheres, including industrial, marine, and mildly acidic conditions. Stainless Steel 304/304L Flat, Square, and Hex Bars also resist rusting and tarnishing, maintaining their smooth and clean surface over time. The 304L variant is particularly effective in welded structures exposed to corrosive environments. These properties make them ideal for hygienic and outdoor applications.
Fabrication and welding of Stainless Steel 304/304L Flat, Square, and Hex Bars are easily achievable using conventional methods. They can be welded using all standard fusion techniques without preheating or post-weld heat treatment. The alloy’s excellent formability allows it to be cut, machined, and shaped into complex designs. Stainless Steel 304/304L Flat, Square, and Hex Bars can be polished to achieve a smooth, mirror-like finish. Their versatility in fabrication makes them ideal for architectural, industrial, and commercial use.
Applications of Stainless Steel 304/304L Flat, Square, and Hex Bars include food processing equipment, kitchen appliances, pressure vessels, heat exchangers, and marine components. They are also widely used in pharmaceutical and chemical industries where hygiene and corrosion resistance are essential. Stainless Steel 304/304L Flat, Square, and Hex Bars perform consistently under moisture, heat, and chemical exposure. Their adaptability across different industries highlights their universal usability. These bars provide a long service life and low maintenance requirements.
In conclusion, Stainless Steel 304/304L Flat, Square, and Hex Bars combine strength, corrosion resistance, and aesthetic appeal in one material. Their low carbon composition and balanced alloying elements ensure superior weldability and resistance to oxidation. Stainless Steel 304/304L Flat, Square, and Hex Bars are suitable for a wide range of industrial, architectural, and marine applications. They offer outstanding performance, durability, and versatility in all conditions. Overall, these bars represent a cost-effective and reliable solution for modern engineering needs.
Specification Table
| Type | Size Range (mm) | Standard | Surface Finish | Length | Grade |
|---|---|---|---|---|---|
| Flat | 5 x 2 mm to 200 x 25 mm | ASTM A240 / A276 | 2B, BA, No.1, No.4 | Up to 6000 mm | 304 / 304L |
| Square | 3 mm to 100 mm | ASTM A276 | Polished / Pickled | Up to 6000 mm | 304 / 304L |
| Hex | 3 mm to 100 mm | ASTM A276 | Hot Rolled / Polished | Up to 6000 mm | 304 / 304L |
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 |
| Manganese (Mn) | 2.00 max | 2.00 max |
| Silicon (Si) | 1.00 max | 1.00 max |
| Phosphorus (P) | 0.045 max | 0.045 max |
| Sulfur (S) | 0.03 max | 0.03 max |
| Chromium (Cr) | 18.0–20.0 | 18.0–20.0 |
| Nickel (Ni) | 8.0–10.5 | 8.0–12.0 |
| Nitrogen (N) | 0.10 max | 0.10 max |
| Iron (Fe) | Balance | Balance |
Mechanical Properties (Typical)
| Property | 304 | 304L | Unit |
|---|---|---|---|
| Density | 8.0 | 8.0 | g/cm³ |
| Hardness (Brinell) | 201 | 187 | HB |
| Ultimate Tensile Strength (UTS) | 585–750 | 485–620 | MPa |
| Yield Strength (0.2% offset) | 215–505 | 170–310 | MPa |
| Elongation (in 50 mm) | 40–60 | 40–50 | % |
| Modulus of Elasticity | 193–200 | 193–200 | GPa |
Equivalent Grades
| Standard | 304 | 304L |
|---|---|---|
| UNS | S30400 | S30403 |
| EN / DIN | 1.4301 | 1.4306 |
| JIS | SUH304 | SUH304L |
| BS | 304S15 | 304S16 |
| AFNOR / NF | X5CrNi18-10 | X2CrNi18-9 |
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.
| Shape | Size (mm) | Weight per meter (kg/m) |
|---|---|---|
| Flat | 10 x 5 | 0.40 |
| 20 x 5 | 0.79 | |
| 50 x 10 | 3.95 | |
| 100 x 20 | 15.8 | |
| 200 x 25 | 39.5 | |
| Square | 5 x 5 | 0.157 |
| 10 x 10 | 1.26 | |
| 20 x 20 | 3.95 | |
| 50 x 50 | 19.75 | |
| 100 x 100 | 78.5 | |
| Hex | 5 | 0.136 |
| 10 | 0.544 | |
| 20 | 2.18 | |
| 50 | 13.64 | |
| 100 | 54.5 |
Types Of Stainless Steel 304/304L Flat Square Hexs and Tubes
Stainless Steel Flat Hex
Monel 400 Flat Hex
Inconel 600 Flat Hex
Hastelloy Flat Hex
super Duplex Flat Hex
Duplex Flat Hex
Monel K500 Flat Hex
Nickel Flat Hex
Frequently Asked Questions (FAQ)
What is Stainless Steel 304/304L?
Stainless Steel 304 is an austenitic stainless steel with excellent corrosion resistance and mechanical properties. 304L is the low carbon variant of 304, designed to minimize carbide precipitation during welding.
What shapes are available for Stainless Steel 304/304L?
It is available in Flat bars, Square bars, and Hex bars with various sizes and finishes.
What are the common applications?
It is widely used in food processing, chemical equipment, architectural applications, automotive parts, and general fabrication requiring corrosion resistance.
What is the difference between 304 and 304L?
304L has a lower carbon content (max 0.03%) compared to 304 (max 0.08%). This improves weldability and reduces carbide precipitation during welding, preventing intergranular corrosion.
What are the surface finishes available?
Common surface finishes include 2B (mill finish), BA (bright annealed), No.1, No.4 (brushed), and polished finishes depending on application requirements.
What standards does Stainless Steel 304/304L conform to?
It conforms to ASTM A240, ASTM A276, EN 1.4301 / 1.4306, JIS SUH304 / SUH304L, BS 304S15 / 304S16, and other equivalent international standards.
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