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Stainless Steel 321L Flat, Square, and Hex Bars are low-carbon, titanium-stabilized austenitic stainless steels that provide excellent resistance to intergranular corrosion. The titanium content in the alloy prevents carbide precipitation during welding, maintaining stability at elevated temperatures. Stainless Steel 321L Flat, Square, and Hex Bars offer superior strength, toughness, and oxidation resistance under continuous heat exposure. They are widely used in chemical processing, aerospace, and power generation applications. These bars perform exceptionally well in environments requiring high-temperature durability.
The chemical composition of Stainless Steel 321L Flat, Square, and Hex Bars includes chromium, nickel, and titanium, along with a reduced carbon content compared to standard 321. The titanium acts as a stabilizing element, improving the alloy’s resistance to sensitization during welding. Stainless Steel 321L Flat, Square, and Hex Bars exhibit excellent corrosion resistance in a wide range of acidic and oxidizing environments. Their low carbon content minimizes the risk of carbide formation. This composition ensures both structural integrity and longevity in service.
Stainless Steel 321L Flat, Square, and Hex Bars possess excellent mechanical properties, including high tensile and yield strength, along with good creep resistance. They maintain stability and toughness even under continuous exposure to high temperatures up to 870°C. These bars are designed for superior performance in thermal cycling and stress conditions. Stainless Steel 321L Flat, Square, and Hex Bars also demonstrate outstanding hardness and durability. Their mechanical stability makes them suitable for critical structural and mechanical components.
These bars exhibit remarkable resistance to oxidation and scaling at elevated temperatures. Stainless Steel 321L Flat, Square, and Hex Bars are particularly effective in environments containing organic acids, phosphoric acid, and mildly oxidizing agents. They perform well under both dry and moist heat conditions, ensuring long-term operational stability. Their excellent thermal strength makes them ideal for use in furnace parts, heat exchangers, and jet engine components. They maintain corrosion resistance even during prolonged service in hot conditions.
Stainless Steel 321L Flat, Square, and Hex Bars are easy to fabricate and weld using conventional industrial methods. Their low carbon and titanium-stabilized composition help prevent weld decay and cracking. Post-weld heat treatment is usually unnecessary, enhancing fabrication efficiency. Stainless Steel 321L Flat, Square, and Hex Bars can be machined and polished to meet specific application requirements. They provide excellent surface finish, formability, and durability, making them suitable for precision engineering applications.
Applications of Stainless Steel 321L Flat, Square, and Hex Bars include aerospace components, chemical processing equipment, expansion joints, exhaust manifolds, and furnace parts. These bars perform efficiently in both high-temperature and corrosive environments. Stainless Steel 321L Flat, Square, and Hex Bars are also used in power plants, refinery units, and marine structures where long-lasting strength and corrosion resistance are essential. Their versatility allows use across industries requiring reliability under stress and temperature variations.
Specification Table
| Property | Specification |
|---|---|
| Material | Stainless Steel 321L |
| Form | Flat Square Hex |
| Standards | ASTM A276 / A479, ASME SA276 / SA479 |
| Surface Finish | Hot Rolled, Cold Rolled, Polished |
| Dimensions | Custom sizes available (Thickness & Width) |
| Length | 1m, 2m, 3m, or custom cut |
| Application | Construction, Engineering, Chemical Processing, Automotive, Industrial Equipment |
| Corrosion Resistance | Excellent in oxidizing environments, resistant to heat and corrosion |
| Heat Resistance | Up to 870°C (1600°F) |
Chemical Composition (Typical ranges for SS321L)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | Composition (%) |
|---|---|
| Carbon (C) | ≤ 0.03 |
| Manganese (Mn) | ≤ 2.0 |
| Silicon (Si) | ≤ 1.0 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.03 |
| Chromium (Cr) | 17.0 – 19.0 |
| Nickel (Ni) | 9.0 – 12.0 |
| Titanium (Ti) | 5 × C min – 0.70 |
| Iron (Fe) | Balance |
Mechanical Properties (Typical)
| Property | Value |
|---|---|
| Density | 8.0 g/cm³ (0.29 lb/in³) |
| Tensile Strength (Ultimate) | 515 – 750 MPa (75 – 108 ksi) |
| Yield Strength (0.2% offset) | 205 – 275 MPa (30 – 40 ksi) |
| Elongation (in 50 mm) | 40% min |
| Hardness (Brinell) | 170 – 220 HB |
| Modulus of Elasticity | 193 GPa (28,000 ksi) |
| Shear Strength | 310 MPa (45 ksi) |
| Impact Strength | 50 – 60 J at room temperature |
| Operating Temperature | Up to 870°C (1600°F) |
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| AISI / ASTM | 321L |
| EN / DIN | 1.4541 |
| JIS (Japanese Industrial Standard) | SUS 321L |
| GB / China | 0Cr18Ni10Ti-L |
| UNS (Unified Numbering System) | S32100 |
| SAE | 321L |
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.
| Across Flats (mm) | Thickness (mm) | Weight per Meter (kg/m) |
|---|---|---|
| 5 | 5 | 0.16 |
| 6 | 6 | 0.23 |
| 8 | 8 | 0.41 |
| 10 | 10 | 0.64 |
| 12 | 12 | 0.92 |
| 16 | 16 | 1.64 |
| 20 | 20 | 2.57 |
| 25 | 25 | 4.01 |
| 30 | 30 | 5.78 |
| 40 | 40 | 10.31 |
Types Of Stainless Steel 321L 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 321L Flat Square Hex?
Stainless Steel 321L Flat Square Hex is a low-carbon, titanium-stabilized austenitic stainless steel designed to resist intergranular corrosion during welding. It is available in flat, square, and hexagonal shapes for various industrial applications.
What are the key features of 321L Stainless Steel?
Key features include excellent corrosion resistance, high-temperature strength, good mechanical properties, and stability against carbide precipitation due to low carbon content.
Where is Stainless Steel 321L Hex commonly used?
It is used in chemical processing, aerospace, automotive, construction, and heat-resistant applications such as exhaust systems, furnace components, and industrial equipment.
What sizes are available for 321L Flat Square Hex?
Sizes vary by across-flats dimension, thickness, and length. Standard sizes range from 5 mm to 40 mm across flats, with custom dimensions available on request.
What standards does 321L Stainless Steel meet?
It meets ASTM A276 / A479, ASME SA276 / SA479 standards and has international equivalents such as EN 1.4541, SUS 321L (JIS), UNS S32100, and GB 0Cr18Ni10Ti-L.
Flats Square Hexs Supplier
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Flats Square Hexs Exporter
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