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SS 440C Angle Channel is a high-carbon martensitic stainless steel product known for its exceptional hardness, wear resistance, and strength. This grade of stainless steel is widely used in environments where toughness and corrosion resistance are equally important. SS 440C contains higher carbon content compared to other 400-series stainless steels, which allows it to achieve excellent mechanical properties after heat treatment. Its polished finish and structural accuracy make it ideal for both decorative and industrial applications.
The SS 440C Stainless Steel Angle Channel offers outstanding performance in high-stress applications such as shafts, valve components, bearings, and precision instruments. Its superior strength makes it suitable for use in chemical processing plants, marine structures, and aerospace components. This material is highly machinable in the annealed condition and can be hardened through proper heat treatment processes. The versatility of SS 440C allows manufacturers to use it in both flat bar and angle channel forms for structural and design purposes.
One of the key advantages of SS 440C is its excellent resistance to corrosion from mild acids, alkalis, and freshwater environments. When properly polished or passivated, it exhibits a smooth surface finish that prevents rust and oxidation, even under humid conditions. Although not as corrosion-resistant as austenitic grades like 304 or 316, SS 440C performs exceptionally well in moderately corrosive environments while offering superior wear and abrasion resistance. This combination makes it a preferred choice for heavy-duty and long-lasting structures.
The SS 440C Angle Channel is often utilized in construction frameworks, support brackets, and machinery assemblies that demand high load-bearing capacity and rigidity. Its high tensile strength ensures that it maintains structural integrity under dynamic stress. These channels are available in both equal and unequal leg configurations, providing flexibility for a wide range of design and fabrication needs. With precise dimensional tolerances, SS 440C Angle Channels are also suitable for precision-engineered projects.
In industrial manufacturing, SS 440C stainless steel undergoes controlled heat treatment to maximize hardness, reaching up to 60 HRC. This treatment enhances the metal’s resistance to deformation and surface fatigue. It also ensures long service life under harsh working conditions, making it ideal for use in knife blades, surgical tools, and wear-resistant machine parts. The high hardness of 440C makes it one of the hardest stainless steels commercially available.
Fabrication of SS 440C Angle Channel requires proper handling techniques, as the high hardness can reduce machinability. However, modern CNC equipment and specialized tooling enable precise cutting, bending, and drilling with minimal difficulty. The material can also be welded using advanced welding techniques, though post-weld heat treatment may be necessary to restore its corrosion resistance. With accurate finishing and polishing, the SS 440C channel attains a mirror-like surface ideal for architectural or decorative applications.
Overall, SS 440C Stainless Steel Angle Channel combines durability, toughness, and corrosion resistance, making it an excellent choice for high-performance engineering and design projects. Its versatility allows use across sectors like petrochemical, food processing, automotive, and marine industries. Whether used in heavy-duty frameworks or fine precision assemblies, SS 440C provides the mechanical strength and reliability demanded by today’s industrial standards. It represents a perfect balance between strength and corrosion performance in stainless steel architecture.
Specification Table
| Specification | Details |
|---|---|
| Material Grade | SS 440C (High Carbon Martensitic Stainless Steel) |
| Standard | ASTM A276 / AISI 440C / EN 1.4125 |
| Form | Angle Channel – Equal & Unequal, Hot Rolled or Cold Formed |
| Size Range | 20mm × 20mm × 3mm up to 200mm × 200mm × 25mm (custom sizes available) |
| Finish | Mill Finish, Polished, or Mirror Finish |
| Hardness (HRC) | Up to 60 HRC (after hardening & tempering) |
| Tensile Strength | 700 – 1200 MPa (depending on heat treatment) |
| Yield Strength | 450 – 1000 MPa (depending on temper condition) |
| Elongation | 8 – 20% |
| Density | 7.7 – 7.8 g/cm³ |
| Corrosion Resistance | Good in mild environments; lower than 304/316 austenitic grades |
| Heat Treatment | Annealed, Hardened, and Tempered for maximum hardness |
| Machinability | Good in annealed condition; requires carbide tooling in hardened state |
| Weldability | Fair – preheating and post-weld heat treatment recommended |
| Applications | Bearings, Valve Components, Knives, Shafts, Wear-Resistant Parts |
| Certification | EN 10204 3.1 / 3.2, Manufacturer Test Certificate |
Chemical Composition (Typical ranges for SSIS)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.95 – 1.20% |
| Chromium (Cr) | 16.00 – 18.00% |
| Manganese (Mn) | ≤ 1.00% |
| Silicon (Si) | ≤ 1.00% |
| Phosphorus (P) | ≤ 0.04% |
| Sulfur (S) | ≤ 0.03% |
| Iron (Fe) | Balance |
Mechanical Properties (Typical)
| Property | Value | Condition |
|---|---|---|
| Tensile Strength | 700 – 1200 MPa | Annealed / Hardened |
| Yield Strength (0.2% Offset) | 450 – 1000 MPa | Annealed / Hardened |
| Elongation | 8 – 20% | Annealed |
| Hardness (Brinell) | 250 – 285 HB | Annealed |
| Hardness (Rockwell C) | Up to 60 HRC | After Hardening & Tempering |
| Modulus of Elasticity | ~200 GPa | At Room Temperature |
| Poisson’s Ratio | 0.27 – 0.30 | Typical |
| Density | 7.7 – 7.8 g/cm³ | At 20°C |
| Thermal Conductivity | 24.2 W/m·K | At 100°C |
| Coefficient of Expansion | 10.1 × 10⁻⁶ /°C | Between 20–100°C |
Equivalent Grades
| Standard | Equivalent Grade | Description |
|---|---|---|
| UNS | S44004 | Unified Numbering System designation for 440C stainless steel |
| ASTM / AISI | 440C | High carbon martensitic stainless steel with high hardness and wear resistance |
| EN / DIN | 1.4125 | European grade equivalent used in precision and engineering applications |
| BS | Grade 440C / 420F | British Standard equivalent with similar chemical composition and properties |
| JIS | SUS440C | Japanese Industrial Standard equivalent for stainless steel 440C |
| GOST | 95X18 | Russian equivalent stainless grade with comparable high-carbon chromium composition |
| AFNOR | Z100CD17 | French standard equivalent for AISI 440C |
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.
| Size (mm) | Thickness (mm) | Weight (kg/m) | Section Modulus (cm³) | Moment of Inertia (cm⁴) |
|---|---|---|---|---|
| 20 × 20 | 3 | 0.88 | 0.27 | 0.55 |
| 25 × 25 | 3 | 1.12 | 0.42 | 0.83 |
| 30 × 30 | 4 | 1.60 | 0.70 | 1.45 |
| 40 × 40 | 5 | 2.84 | 1.65 | 3.30 |
| 50 × 50 | 6 | 4.23 | 3.00 | 6.12 |
| 65 × 65 | 6 | 5.55 | 4.80 | 9.75 |
| 75 × 75 | 8 | 8.35 | 7.50 | 18.20 |
| 90 × 90 | 8 | 10.12 | 10.20 | 26.50 |
| 100 × 100 | 10 | 13.40 | 14.80 | 40.25 |
| 150 × 150 | 12 | 24.50 | 38.60 | 105.80 |
| 200 × 200 | 15 | 39.50 | 80.40 | 240.60 |
Types Of SS 440C Angal channel
Stainless Steel Angal & channel
Monel 400 Angal & channel
Inconel 600 Angal & channel
Hastelloy Angal & channel
Super Duplex Angal & channel
Duplex Angal & channel
Nickel Angal & channel
Monel K500 Angal & channel
Frequently Asked Questions (FAQ)
What is SS 440C Stainless Steel Angle Channel?
SS 440C Angle Channel is a high-carbon martensitic stainless steel section known for its exceptional hardness, wear resistance, and strength. It is commonly used in applications requiring high durability and moderate corrosion resistance.
What are the main features of SS 440C Angle Channel?
SS 440C Angle Channels offer high tensile strength, excellent hardness (up to 60 HRC), good dimensional stability, and superior resistance to wear and deformation. They are ideal for mechanical, structural, and tooling applications.
Where are SS 440C Angle Channels commonly used?
These channels are widely used in industries like aerospace, marine, petrochemical, and mechanical engineering. Common applications include shafts, bearings, valves, knives, and load-bearing frameworks where both strength and corrosion resistance are required.
Is SS 440C Angle Channel corrosion-resistant?
Yes, SS 440C offers moderate corrosion resistance, particularly in fresh water and mild chemical environments. However, it is less resistant than austenitic stainless steels such as 304 and 316, and not suitable for highly corrosive or chloride-rich conditions.
Can SS 440C be welded or machined?
Welding SS 440C is possible using specialized procedures, but preheating and post-weld heat treatment are recommended to prevent cracking. It is readily machinable in its annealed condition, though machining becomes more challenging when hardened.
What are the available finishes for SS 440C Angle Channels?
SS 440C channels are available in mill finish, brushed, polished, and mirror finish options. Polished surfaces improve aesthetic appeal and corrosion resistance for architectural or decorative applications.
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